just4Food
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just4Food
just 4Food ISSUE 3 ■ SPRING 2003 inside… Helping Your Body to Help Itself – the story of prebiotic and probiotic ingredients Encapsulates Teaching Unit Operations of Food Processing Food Technology Update FREE SAMPLE of Frimulsion ED2N (stabiliser blend) Making Milkshake Using Stabilisers Keeping Cool At Work – Profile of a Food Technologist (Special Pull-Out) Welcome just 4Food CONTENTS ■ by Geoff Hancock W elcome to the 3rd edition of Just 4 Food, the national magazine 4 Food Technology Update dedicated solely to supporting Food Technology teachers with real pupils Food Packaging News 6 in real classrooms. May I take this opportunity to wish you all a very 7 The Unit Operations of Food Processing happy new year. I know that the coming term is especially busy for all of you year 11 and 6th form teachers, preparing your pupils for their examinations. Making Your Own Lunch 10 Sian and I have been thinking hard about the next few editions of Just 4 Food and we hope to provide you with information and ideas on many of the 13 Acrylamides in Our Food challenging new areas of the subject. Once again I would particularly like to thank all of you who took the trouble to write in and send emails Encapsulates 14 with comments and suggestions about the magazine. Both Sian and myself are committed to producing a publication that is both down to earth and informative. 16 New Product Development We want to be both forward looking and practical and to this end would welcome your ideas about future content. Please telephone, fax or email. In particular we would welcome ideas about how we can provide Profile of a Food Technologist – Special Pull-out! support for pupils and students – please let us know. In this issue we have concentrated upon new product development, the design element of our subject. I hope you will find it useful and stimulating. “Sian, Many thanks for the Just 4 Food magazine, it is great to have a Magazine specifically for us, and a brilliant way for us to keep up to date with the ever changing and developing industry. It is great to have someone like you out there helping us here to inspireand motivate our students!” Making Ice-Cream 21 What’s Your Flavour 25 19 Making Milk Shake Using Stabilisers 23 Back to Basics Lisa Mansell Head of Food/Textiles Results Analysis 27 HELSTON SCHOOL, CORNWALL 29 2 Prebiotics – Helping Your Body to Help Itself ● FOREWORD FOREWORD ■ by Sian Cocks H appy New Year to everyone. As it’s the season when the school year is in full swing, yet with a few weeks of winter to follow, we need to motivate our pupils with interesting study ideas. Again, in this edition of Just 4 Food we hope to provide you and your pupils with up-to-date information and lesson ideas relevant to what is happening in the food industry and the curriculum. The end of 2002 saw try new and positive media attention focused on approaches and ideas for some of the poor hygiene capturing children’s focus standards in catering on these topics. outlets. For example, the I was pleased to see FSA studied 1,000 food that many useful resources workers and found that a produced by the BNF and half did not wash their DATA relating to CAD/CAM hands before preparing and Manufacturing have conferences. Chatting to fascinating subject. Do get food and a third did not been distributed to you emphasised to me in touch if you would like to wash them after using the thousands of teachers. what an abundance of share your ideas. Hopefully more, similar experience and good resources for teaching A ideas teachers have and Q and A page for teachers about the rise in diabetes level and other areas use in the classroom to to write in with comments and obesity in children, so useful to teachers will deliver the existing food and questions or topic there is a continuing need appear over the next few curriculum, often with very area requests. I would be to promote meaningful months. Look out for our few resources. I would like grateful if our readers messages on healthy new book on Smart Foods to use this magazine as a could send these vial email eating and exercise. Both if you need teaching ideas, medium for sharing tried to us so that this can be these topics are issues that and a teachers’ support and tested ideas. Hopefully established. have been discussed in web site which I hope to this ‘pooling’ should help to depth for many years, yet set up before too long. reduce teachers’ workload feedback, so if you wish to and provide stimulating make a suggestion then do toilet! We are still hearing still come back to haunt us At the end of last year I Look out for our new book on Smart Foods I still intend to set up a We always welcome your and require further study was able to get out and lesson suggestions that email them to me at: and awareness-building, about and meet teachers encourage and motivate [email protected] plus I feel it is important to at Food Technology pupils to study this just 4Food ■ ISSUE 3 SPRING 2003 3 F O O D T E C H N O LO G Y U P DAT E ● FOOD TECHNOLOGY UPDATE… Functional snacks We have known for a while New source of omega 3s that there is a popular DHA (docosahexaenoic market for foods and drinks acid) powder is now with specific health- available in some parts of benefiting properties, yet the World, but not yet the there is still scope to link UK. It is rich in omega 3 functional aspects to fats we can be lacking in create an ‘eat as you go’ our diet and is particularly product that contains important for healthy eyes healthy components such and brain. This powder as ‘5 a day’ fruit. It should can be used in bread and be carefully designed and will be useful to those who packaged, easy to do not eat oily fish or take consume while doing supplements regularly. something else and fit in CAD/CAM with young consumers’ lifestyles. Look out for new Look out for ‘eat as you go’ products that contains healthy components such as ‘5 a day’ fruits. produced by the BNF in product development ideas coming through which New vitamin findings match these requirements. conjunction with DATA on Although we are aware of New flavoured dairy products the basic physiological A German company, and Computer Aided Meat video magazine functions of vitamins within Campina, is launching a Manufacture in food This is a free resource for our body, there are still range of dairy-based technology. The booklet is secondary teachers in research findings drinks and desserts which 12 pages long and can be Food Technology, available continually coming through C it hopes to export to the downloaded or printed off which suggest that we still UK, so look out for it. It from www.nutrition.org.uk have a lot to learn about includes coffee and walnut this subject. Vitamin E and flavoured drinks and included, such as cooking C have been found to help NutriStart breakfast drink. multi-cultural food, prevent cataracts, vitamin manufacturing processes B12 and folic acid can desserts with fruit, vanilla, used to make ready meals B12 Sago and cream dual pot help prevent heart disease cinnamon or chocolate etc. Available from: BMES, and vitamin D may have a flavours should be in some Meat and Livestock role to play in preventing supermarkets with new Commission, Winterhill the incidence of diabetes. from the Meat Education Service. There are 3 separate programmes House, Snowdon Drive, Milton Keynes MK6 1AX. 4 A new booklet has been E D yoghurt flavours in walnut, mandarin, marzipan, roast apple and gingerbread. just 4Food ■ ISSUE 3 SPRING 2003 Computer Aided Design ● F O O D T E C H N O LO G Y U P DAT E FUTURE PRODUCT DEVELOPMENTS FOR 2003 ARE BLUE CHIPS, GREEN PANCAKES AND FIZZY YOGHURTS, SUGGESTS MINTEL. New trends Fat-free crisps Predicted trend areas for The first completely fat- future product free crisps have been development have been made in Australia. They suggested by Mintel for are made from the tubers 2003 and include: of a North American ■ unusually coloured sunflower (not potato) and foods for children e.g. cooked using a specially blue chips or green designed system that uses pancakes dried air instead of frying ■ fizzy yogurt drinks them in oil. ■ Asian cuisine ready meals for healthy eating market New Product Launches Fat Free Crisps… at last! ■ convenience meal kit (chilled) ■ citrus, wasabi or traditional vanilla flavoured products ■ antioxidant-rich white tea products ■ juice flavoured milk drinks and a variety of other new beverages Prebiotics for cereal bars Cosucra has developed a ■ Canterbury Foods – New ingredient for low fat spreads bind up volumes of water As many consumers try to can be spread. Two new reduce the amount of texturant hydrocolloids are animal fat they consume, now available from a low fat spreads continue to company called Degussa be popular. Hydrocolloids which contain alginates – new butters blended are usually incorporated in (extracted from a with crushed garlic, such products, both to seaweed) and pectins mimic the mouth feel of (extracted from fruit). in a stable emulsion that butter or margarine and to double latticed pastry tops with pepper & mustard or sage & onion sprinkles to add interest to pies or ready meals. ■ Lurpack by Arla Foods Mediterranean herbs and lime and chilli to use in cooking, sandwiches etc. ■ Cauldron Foods – new formula for its chicory Moroccan Chickpea paté fructo-oligosaccharides ■ McCain – Vibes hot which can now be used for crinkle crisps for adults ‘healthy’ cereal bars. This ■ Bio-familia – ‘Pickers’ a fibre will enrich muesli muesli product in 2 style bars when added varieties, honey and into the syrup binding, or chocolate, which does not need to be eaten fruit filled bars during with milk or a spoon. It shortbread making. is made up of bite size pieces of muesli in a resealable 125g pot. chicory fructo-oligosaccharides which can now be used for ‘healthy’ muesli style bars. just 4Food ■ ISSUE 3 SPRING 2003 5 F O O D PAC K AG I N G ● PACKAGING NEWS New egg boxes RFID labels The British Egg Industry A company called Sato UK Council are supporting the have started to produce a launch of a new egg box ‘smart’ food labelling which can hold 7 eggs machine. This uses radio instead of the usual 6. This frequency identification is a promotional exercise technology to produce to encourage us to eat one self-adhesive tags that can egg each day. be read even if they are out of the field of vision of Country of origin labelling The FSA have issued formal guidance to food manufacturers to label foods with their country of origin in an attempt to 6 the reader, eg inside the package. Edible packaging Scientists in the Food Packaging Films Group are currently working on the development of a prevent the confusion that packaging film that not consumers feel over some only protects food from food labels. Special care bacterial contamination but will be needed in clarifying can be eaten after use as the difference between the well. This film is made from place of processing and soy and corn proteins and the origin of major should be best suited to ingredients used. recycling as animal feed. Pouring spouts for bottles Talking beer labels An Israeli company, Dania plastics, have produced a retractable pouring spout to go inside the neck of a bottle. This spout pops out of the bottle on opening and allows for controlled, smooth, accurate dispensing of liquids such as spirits, syrups or oils. Molson’s lager has Food allergies and intolerances on the increase There is much concern over possible increased incidence of insensitivity and allergenicity to certain food ingredients, especially in children. Some research findings are starting to come through to support these concerns, which in turn has led to a demand for better labelling of such foods. just 4Food ■ ISSUE 3 SPRING 2003 In America and Canada launched a talking label on its base. These are designed to make any one of 80 comments once opened, in an attempt to start up a conversation in a bar setting. ‘Packaging the stars of the future’ The Institute of Packaging has launched a variety of competitions and courses in response to their leaflet for schools and colleges, which includes the Schools Design Awards. It has been set up to encourage packaging designers of the future and there has been a big response so far. For more information contact [email protected]. ● FOOD PROCESSING The Unit Operations of Food Processing A study of the processing operations used in the manufacture of foods is a part of the A Level Food Technology curriculum. Teaching unit operations can seem a daunting task, especially if you haven’t seen much in the way of largescale production equipment in action within a commercial situation. However, it needn’t be an uphill struggle… Unit operations form a vital process which employ When teaching about aspect of food production, mass transfer and plant the manufacturing of food, One of the best ways to and I consider it to be equipment. They should the identification and get students thinking is to important to impart a feel cover incoming ingredient sequencing of each step ask them how they for what is involved to storage, preparation, in a process line and the imagine a certain pupils who, even if they combining and conversion, basic principles employed operation is achieved by don’t end up working in plus preservation, finishing can seem very technical factory equipment and the industry, eat the food off, packing, coding, testing and often uninteresting, machinery: eg how is an that is made. There are and dispatch. Most of especially if a typical egg removed from its plenty of job openings for these steps, which make mass production line is shell? How is sandwich those wanting to work in up an overall process line, shown. Important paste pasteurised? How the food industry, and can be separated into two concepts worth are peas individually quick skills shortages in certain main categories: primary introducing include frozen in seconds without (or preparatory) processing coordination of systems clumping? Pupils are often and secondary and operations, control very good at working out (converting) processing, throughout processing, how such operations are where the form of the final effective and efficient achieved, along with the product becomes more activity and operations, logistics and constraints evident. sanitary design of that may be involved. areas of engineering and management at present. It is also worth pointing out that without the processing manufacture of food we would not have equipment and traceability. the huge diversity of products available to us, lives or convenience we are used to. Most of the foods we buy have undergone some sort of processing or other, even the loose apples we purchase in a supermarket have been cold/ atmosphere stored, washed, sorted, graded and boxed. Unit operations are the INCOMING INGREDIENTS g g g with the extended shelf- How do they do that? P R I M A RY P RO C E S S I N G S E C O N DA RY P RO C E S S I N G PAC K AG I N G A N D D I S PATC H It can become too easy to theoretically study the definitions of homogenisation or pasteurisation without it meaning much to those involved. However, the topic of food processing lends itself to study via many different An egg breaker machine approaches, with plenty of links into related areas which may stimulate your Continued overleaf… pupils’ imaginations: individual stages of a just 4Food ■ ISSUE 3 SPRING 2003 7 FOOD PROCESSING ● The Unit Operations of Continued from previous page… Diagrams promotional pamphlets Comparison Get pupils to draw simple and materials produced by How the same product Study the physical changes diagrams which food companies. Ask can be processed by A option for raw materials demonstrate processes: pupils to work out what different methods: eg as they are processed eg eg microwave oven, they do and for which food yoghurt, cheap versus in bread making, simple evaporator, fluidised bed products. expensive chips, crisps cheese making, fruit and cornflakes. Compare during freezing or cooking. drier, tubular heat Scale-up kitchen equipment different types of Think about how the basic the same jobs eg tubular Problem solving exercises Flow diagrams principles of action of and plate heat Consider equipment Draw diagrams which kitchen equipment can be exchangers. options, dealing with waste: sequence all the unit scaled up and applied at a operations used to commercial level (with a process popular foods: eg little adaptation): eg Examine effects and use baked beans, meat pies, liquidiser, food mixer – Consider pressure, fruit yoghurt etc. kneading or whisking – temperature, acidity etc in ice-cream maker (scraper process conditions to alter Research new technology What do you think this does/is used for? surface heat exchanger), the physical characteristics Consider ohmic and di- garlic press (extrusion and of food: eg in sterilisation, electric heating, pressure Show diagrams and size reduction), fridge pasteurisation, fermentation, processing, computers, photos of industrial (blast chiller), microwave mixing and homogenisation. robotics, logic controllers, equipment, pictures from oven etc. Typically of milk, cream, CAD etc. exchanger, using them as description aids. trade magazines, equipment that perform eg whey from cheese making, yields, costcutting, energy usage etc. salad dressings etc. Efficiency, effectiveness, ecological issues FEED Carry out simple PRESSURE ADJUSTMENT calculations: mass transfer, chilling rates (eg comparing domestic fridges with blast or fluidised bed freezers), output volumes, food SCREW SOLIDS wastage levels and importance of using waste as by-products, heat reclamation during evaporation (eg multistage evaporation). LIQUOR ‘A simplified diagram of a screw press commonly used to express oil from seeds’ 8 just 4Food ■ ISSUE 3 SPRING 2003 ● FOOD PROCESSING Food Processing Transferral U S E F U L S O U R C E S O F I N F O R M AT I O N Look at links between each operation: eg Books Web sites conveyors, pumps, valves, ■ Food Processing General elevators, storing etc. Considerations and constraints For each operation: eg Technology: principles ■ www.foodtech.org.uk and practice, PJ ■ www.foodproductdesign.com Fellows. Woodhead ■ email [email protected] for size reduction Publishing Ltd maintaining quality, cost, Min Cheng. Ellis preventing over- Horwood processing, destruction of equipment booklets ■ Food Machinery, Ling- ■ Introduction to Food micro-organisms, control, Engineering, RP Singh standardisation. and Dennis R Heldman. Academic Press Case studies of real systems ■ Food Engineering Operations, Brennan, Consider ISO, HACCPs Butters, Cowell and Lilly. and other industrial Applied Science practices. This way the curriculum requirements, such as studying the effects of Publishers Ltd ■ The Dairy Handbook. APV ■ Food Processing processing when choosing Operations and Scale a unit operation, the Up, L J Valentas, Leon evaluation of equipment and understanding the Levine, JP Clark ■ Trends in Food Food Products ■ Tivall information pack (meat analogue) www.tivall.co.uk ■ www.fabflour.co.uk – the Flour Advisory Bureau ■ www.cauldronfoods.co.uk – Tofu working characteristics of Technology – Food ■ www.tateandlyle.co.uk food can be met in a Processing, Hazel King. ■ www.britishsugar.co.uk varied and hopefully stimulating way. It can be Heinemann Library ■ Unit Operations For The Equipment supported by a visit to a Food Industries, Wilbur ■ www.urschel.com – how to cut products food manufacturing plant if Gould. Cti Publications ■ www.apv.com/ – pumps and systems ■ www.kraftunitops.com you are lucky enough to be able to arrange one. For examples of work sheets on these topic areas send a request to: [email protected] CD Roms/Journals: ■ www.alfalaval.com – various ■ Quorn Fact File – Quorn ■ www.sortex.com – colour sorters Education Service: ■ www.coatandfry.co.uk – fryers www.quorn.com ■ www.spcfood.co.uk/html/search.asp – various ■ Teachers Pack on Food ■ www.dairyconsultant.co.uk/pages/ Science – Institute of Food Science and Videos: Technology ■ Ryvita – www.ryvita.co.uk ■ The European Food and ■ The Great British Banger – MLC Drink Review articles just 4Food ■ ISSUE 3 SPRING 2003 9 MAKING BURGERS ● Making your F rancis Talbot, Head of Design and Technology of Gryphon School, Sherbourne in Dorset asked me to help set up and deliver an ‘activities morning’ for their Year 9 Food Technology students pupils. The remit was to allow the students to make a range of commercial style products for themselves using smart ingredients that have demonstratable functionalities. The sort of meal that might Beef burgers appeal best to typical The beef burgers were made teenagers was chosen using an economy recipe (minus the chips!); with textured vegetable The pupils involved protein (TVP) to ‘extend’ were asked to ‘think the meat but with the commercial’, that is to addition of isolated soy consider how these protein to texturise, bind products are made and shape the formed in a food burgers. The soy factory and protein gives the why the burgers a regular ingredients shape and firm used are so important texture, making them in processing, quality easier to handle on a and the final shelf-life of conveyor belt. The juices will the products. The local press be bound up in the soy protein so were invited along. Waitrose Supermarket, that the burgers do not shrink on cooking. Gillingham, very kindly supplied the basic ingredients provided as samples from a variety of ingredients Economy beef burger ingredients Tomato Ketchup ingredients suppliers. ■ 190g minced beef ■ 400ml water ■ 60g TVP ■ 144ml distilled vinegar ■ 110ml water ■ 24g oat starch ■ 60g isolated soy protein ■ 10g salt ■ 70g finely chopped ■ 3g sugar required and the industrial (smart) ingredients were Beef burger in a bun with tomato ketchup and milk shake (see milkshake recipe on page ?) onions Each group of pupils was asked to make one of these ■ 0.5g ginger products. Two batches of each were made, one with and ■ 3.5g Oxo cube (beef) one without the industrial ingredients provided, in order to ■ 1g nutmeg compare them and demonstrate the functional properties of the ingredients used. 10 ■ 3g English mustard ■ 4g salt ■ 1g ground black pepper just 4Food ■ ISSUE 3 SPRING 2003 ■ 1g mustard powder ● ‘Group discussion on organising burger making’ ‘A dough maker’ ‘Mixing the ingredients’ MAKING BURGERS ‘Burger analysis’ …own lunch! Place the minced beef, ■ Why is soy so popular onions, TVP and isolated as a functional food soy protein along with the ingredient for health spices and seasonings in products? a bowl and mix with a ■ Why is TVP added to spoon or using a food economy burgers? mixer. Stir thoroughly while a desirable colour, texture minutes, then cooled and and shelf-life. tasted. The bread rolls we made The final loaves of used ascorbic acid (vitamin bread were compared for C) as a flour improver to texture, loaf volume, even emulate the Chorleywood rising, colour and taste. bread making process as The textures of the bread’s adding in the water, stir for Bread rolls closely as possible with the ‘crumb’ can be recorded a further 3 minutes. Weigh For bread to be made aid of a bread maker. The and examined by cutting a out 75g amounts and quickly and efficiently in recipe used was the one for roll in half and placing it shape using a burger large volumes, modern Basic White Bread as given on a photocopier for press (with burger papers processing techniques in the bread maker booklet photocopying. if you have them). Store in have been developed to that came with the a fridge until ready to fry save time in manufacture, machines used. We took Topics for discussion: up in an oiled frying pan. by using a single rising care to use pure bread flour ■ Why the Chorleywood Note: please wash method and additives to with no improvers included process was developed hands well after handling encourage rapid gluten (purchased from a health and how it differs from raw meat; take care of hot formation. These additives food shop). The vitamin C traditional bread oil when frying. and others – which can was added at 3-5 g per making methods include soy, acids and 500g flour. The dough was ■ How an oxidising agent of burgers for flavour, texture, bleaching agents – are cut into 10-12 portions and improves gluten strand taste and smell. incorporated to give bread baked at 180°C for 12-16 Compare the two batches formation in a loaf ■ How yeast helps bread to rise Topics for discussion: ■ Why salt, butter and ■ How can using isolated sugar are used in bread soy protein be a ■ What makes a good processing aid or bread? improve the nutritional ■ What different types of quality of burgers? bread are there, what ■ How are burgers ingredients do they formed in a burger contain? manufacturing process Continued overleaf… line? just 4Food ■ ISSUE 3 SPRING 2003 11 MAKING BURGERS ● Making your own lunch! Continued from previous page… Tomato Ketchup ■ Why might an oat starch The tomato ketchup was be used instead of made using an alternative another, more commonly thickening agent to the usual modified starch: a natural oat starch. This used thickening agent? ■ Introduce terms such as viscosity and syneresis. ■ What sort of heat issue in New Product product could be improved Development. by using added ingredients Industrial style recipes, such as the ones used equipment such as here, are very basic ones enclosed heat exchangers supplied by ingredients (thus preventing companies to demonstrate evaporation of volatile the sort of chemical exchangers would be the function of their flavours and excess processing (such as acid used to heat such a products. They provide moisture). hydrolysis) that is used to sauce (eg scraper Food Technologists with a alter the sorts of native surface heat starting point from which to industrial style equipment starches used for modified exchangers)? develop an adapted recipe exactly in the kitchen, or formulation. Often pupils although bread makers starch has not undergone starch manufacture, yet it It is difficult to emulate will still increase the What was learnt? are disappointed that their and liquidisers are viscosity of the final The importance of product is not exactly like a excellent. It is hard to product. Oat starch is also repeating and replicating bought one. It is useful to quickly and efficiently heat recipes exactly in order to use this as a learning tool up and cool down sauces achieve a consistent by asking them why it is and milk shakes: what product, an important different and how their takes 20-30 minutes using purported to contain health benefiting betanin and beta-glucan, so we could a ‘bain- marie’ will take also claim to be making a seconds using a heat potentially ‘functional’ food. exchanger and there will Heat up a saucepan of be less evaporative loss. water. Blend all the dry When frying burgers, it ingredients in a heat proof is important to be safe and bowl. Add a little of the control the temperature water to form a paste, then used. It is possible to burn slowly add the remaining the outside while still not water and stir. Add the achieving a required tomato puree and vinegar. internal temperature of 72- Place the bowl over the 75°C. saucepan of simmering Temperature probes are water and stir continually until it reaches 95°C. Add Assessing temperature of ketchup using a probe. to work hygienically and becomes too thick. Cool clear up as you go were and pour into a sterile jar. found to be important in Compare the two such a practical session. It sauces for texture and is often necessary to discuss why the oat starch explain the importance of is used in such a product. getting others to try your product for constructive Topics for discussion: comments, as it is often ■ Which ingredients are assumed that if you made usually used to thicken such a sauce? very useful in such work. Planning ahead, the need more water if the mixture 12 and commercial style it yourself it tastes great Final tasting. just 4Food ■ ISSUE 3 SPRING 2003 even when it doesn’t! ● ACRYLAMIDES Acrylamides in our Food S ome Swedish scientists caused a stir last year by revealing that they had discovered a potentially carcinogenic chemical, acrylamide, in certain foods. It caused damage to the genetic structure of cells in laboratory animals, suggesting it could be harmful to us when eaten and is a known genotoxin (DNA damaging). Acrylamide can be present in starchy foods that have been heated to high temperatures, such as crisps, bread and breakfast cereals, with higher levels shown in fried or baked foods. In oven chips there were found to be 12,000 parts acrylamide per billion and in crisps over 1,000, whereas none was found in uncooked or boiled potatoes. However, the safe level of exposure is not known. Scientific and government bodies all over the World called an emergency meeting at the World Health Organisation and responded by carrying out their own research. They requested that consumers stay calm and maintain a balanced diet, moderating their consumption until conclusions can be properly formulated. We are all exposed to natural chemicals in foods and any risks from acrylamide are not new. Dr Andrew Wadge of the Food Standards Agency said last summer “It is too early to identify either the effects of acrylamide in food on people or even how it is formed.” In the Autumn Procter and Gamble reported that their research showed that the potential carcinogen VULNERABLE FOODS SHOULD NOT BE OVERCOOKED FOR A LONG TIME AT HIGH TEMPERATURES. was found in a diverse reactions, especially in range of foods, even moist conditions. asparagus, banana chips Research was carried and pretzels. Early research out at both Reading and has indicated that it is Leeds Universities, where probably formed by the asparagine was reacted reaction between the amino with glucose in moist acid asparagine and a conditions using a carbonyl containing phosphate buffer. It yielded reducing sugar, a key ‘significant’ quantities of precursor to acrylamide in acrylamide. Further food products. This research in Switzerland has suggests that acrylamide shown small concentrations may be formed as a result forming with methionine or of Maillard browning cysteine as well. just 4Food ■ ISSUE 3 SPRING 2003 Asparagine is the dominant free amino acid found in potatoes, cereals and cooked plant-based foods. An experts’ meeting in Ireland in November, set to discuss further advances in research, concluded that they now know how acrylamide can be formed in food and how its levels can be minimised. They stressed the importance of taking caution in all stages of food preparation, both in the home and in food manufacturing. Vulnerable foods should not be overcooked (for a long time at high temperatures), fried starchy food consumption should be minimised and potatoes are best blanched before cooking with oil. Despite these findings, it is still believed that scientists need to develop faster, cheaper analytical methods that can be routinely used for the analysis of foods and to find ways to reduce acrylamide formation during cooking. Interested parties have been encouraged to register further research projects. A network has been set up with a view to providing an informative website for sharing findings relating to acrylamides. The American FDA has research summaries on their website. Consumer recommendations will also be drawn up. 13 E N C A P S U L AT E S ● ENCAPS E ncapsulates are a typical example of during processing such as how technology in food ingredient mixing, with a pH change, to ‘trap’ and encapsulate on contact with certain is often referred to as a enzymes or by dissolving ‘functional matrix’ and the in water. choice of this material will processing has developed and become sophisticated. It is used extensively in a variety of products and is a process type that is currently in demand. Encapsulation is used depend factors such as for a variety of reasons, water solubility, stickiness including the conversion of or smoothness of the final liquids to powders, encapsulate. They include Encapsulation of are right or change. This ingredients has allowed also allows for regulation protection (keeping a alginates, celluloses, manufacturers to control during processing and hydroscopic ingredient starches or maltodextrins. ingredient interactions by controlled interactions from absorbing If protection against giving them specific within foods. Release will atmospheric moisture), moisture is required, fats, release requirements. They occur, for example, during reducing dust formation or waxes, emulsions and incorporate active heating when cooking to a waste. It is used in a huge shellac are used. ingredients that form a certain temperature, range of foods, from nucleus which is held chewing during eating confectionery to dairy within a covering or (mastication), shear action products. microcapsule which completely surrounds it as a protective shell. This system is used to create a barrier between two incompatible food components (in the form of a capsule) which can protect the enclosed ingredient from external conditions. Encapsulates are ‘intelligent’ ingredients because the shell is partially permeable. It will protect sensitive contents against unfavourable surroundings yet release them when the conditions 14 The coating that is used Products which include encapsulated ingredients can be: ■ Coatings – for ENCAPSULATES ARE ‘INTELLIGENT’ INGREDIENTS BECAUSE THE SHELL IS PARTIALLY PERMEABLE. IT WILL PROTECT SENSITIVE CONTENTS AGAINST UNFAVOURABLE SURROUNDINGS YET RELEASE THEM WHEN THE CONDITIONS ARE RIGHT OR CHANGE. just 4Food ■ ISSUE 3 SPRING 2003 controlled flavour release, anti-caking properties and flavour retention ■ Colours and flavours to protect them from degradation during storage ■ Vitamins, minerals, antioxidants and acids to keep them stable ■ Freeze/thaw products that undergo baking and adverse pHs ■ Leavening agents ● E N C A P S U L AT E S UL ATES Sour ‘blast’ sweets are keeping them moist after The most popular hot spray dryer chamber rolled in encapsulated cooking. When used in methods of encapsulation against or with a flow of citric acid and sugar to bread making it will are: heated air as a very fine prevent the acid dissolving prevent the salt from until the sweets are in the retarding yeast activity. mouth. This is done using hydrogenated oil or oil mixed with emulsifiers as an encapsulating matrix. Odouriferous ingredients such as onion and garlic can be encapsulated and added to recipes without contamination during storage. Volatile flavour oils spray. The core will form Spray drying: droplets whilst the eg to create fine powders insoluble portion will coat as a medium for carrying of maltodextrins, the outside and harden as nutrients such as hydrocolloids etc, where selenium. When fermented the core material is usually in a nutrient-rich base it oil-based and the will readily absorb those surrounding material is nutrients and hold them. water-soluble. The coating The yeasts can then be is first dissolved, then the processed, dried and coating material is added, encapsulated to use as a along with an emulsifier to fortificant ingredient. make the mixture miscible. Yeast is used nowadays which can easily be lost by Enzymes and cultures evaporation during thermal can also be encapsulated. The mixture will then be evaporation takes place. Bed fluidisation: eg for teas and bakery ingredients is useful for solid core particles. These become coated as they are lifted by a hot current of air. When they fall and are lifted again layers of coating develop. pumped into the top of a processing can be Extrusion: protected by eg using solid melt encapsulation to make technologies for granules with a timed encapsulating flavours. flavour release in a food. The core material and Citrus flavours are those coating are combined most prone to rancidity through concentric tubes and off flavour formation within a specially designed during storage, so these nozzle. are usually encapsulated Encapsulation of to give a shelf life of up to ingredients has made 2 years. them more complex, but has allowed for much more Salt can be microencapsulated to give a controlled interaction free flowing salt with a within food systems. It is microfilm of fat being used more and surrounding it. This can be more by food designers, used for sausages to as its benefits to the food prevent the salt from industry are far-reaching drawing out proteins, and not yet fully exploited. just 4Food ■ ISSUE 3 SPRING 2003 15 PRODUCT DEVELOPMENT ● NEW PRODUCT DEVELOPMENT ■ by Mary Fry M ary Fray worked in the food industry for 10 years, the last 5 of which were spent in the New Product Development of ready meals for a major supplier of convenience meals to UK supermarkets. She now works in Education, teaching Food Technology in Further Education and delivering short courses to the food industry. One of the most frequently asked questions she is given is: where do new ideas come from? This is her response. Most people believe that the ideas are re-circulated from recipe books; to some extent this is true, however the real story is far bigger. Many retailer own label products are specifically designed using a brief supplied by a supermarket, leaving little scope for the manufacturer’s developers’ creative ideas at the ‘conception’ stage. Although each supermarket has its own approach to developing a team of technologists, a Safeway or Sainsbury’s team may get 16 Where do those new ideas come from? together to ‘board storm’ ideas along a certain trend or theme eg Italian convenience meals. Use of market research information or concepts is rarely made. Some of the questions that may be asked within a development team in this situation might be: ■ Has a member of the team visited Italy recently? ■ If so, what did they find that was new or interesting? ■ Which meals have the team members tried in Italian restaurants or while dining with Italian Nationals? ■ Are there new regions of Italy with specific cooking styles opening up to tourists? ■ Has a new type of pasta been launched into the market place? ■ Is the company hoping to match another company’s products (a ‘me too’ meal which will compete with one that has already proven to be successful)? ■ Has a new recipe book been launched recently and is the Author willing to collaborate with the company to produce a new product? ■ Has a new ingredient recently become available: eg a specific variety of mushroom or unusual cheese? ■ Has a new piece of machinery been developed that replicates an operation previously done by hand that can be exploited for commercial production? Answers to these questions provide useful information as to what is going on in the World’s market, what competitors are doing and which products are being launched. Truly innovative or ‘blue sky’ ideas are rare, but still spring up occasionally and it is important to remember that anyone can have a viable idea and no idea, no matter how daft, should be dismissed out of hand immediately. Brain storming groups or ideas generating sessions should be carefully managed, constructed and controlled to allow for ‘creative synergy’ and good just 4Food ■ ISSUE 3 SPRING 2003 communication between its members in order to harness their ideas. Once a good idea has been put forward and discussed, it must be clarified and well thought through. The idea must then be researched, especially if it is a traditional product. Further questions: ■ Which ingredients will be required? Can these be sourced in the UK or do they have to come from the country of origin to retain the same name? ■ What expectations will the consumer have of your product and can you achieve them? ■ Will the product only have limited availability because it is associated with a certain time of the year or because of seasonal ingredient supply? ■ Do you have the correct equipment or trained staff to make the product? ■ Do you have factory space to manufacture the new product? Satisfactory answers to these questions need to be given before kitchen development work can begin, the answers may well affect the type of product produced. The flow of development from concept to finished product may be less than 8 weeks, although it usually takes months and occasionally years. This must be well organised with a multi-faceted team involved, all working together to a well defined brief that everyone understands. just 4Food Profile of a Food Technologist Special Pull-out! PROFILE OF A FOOD TECHNOLOGIST ● NAME: Helen Brierley (Age 39) JOB TITLE: Technical Controller for Chilled Foods EMPLOYER: Safeway I feel that my job has many attributes, and job satisfaction comes from the challenging nature of the food retail business, its variety and scope for achieving success. There’s plenty to learn and experience in this fast moving business. I have always been interested in food, and from an early age I knew that this was the area I intended to study. Having successfully completed my A levels in Chemistry, Biology and Maths at Yeovil College, I did a 3 year BSc Honours degree in Food Science at Reading University. This included a summer work placement at Childhay Manor Farm, a dairy which at that time produced creams. Having graduated in 1984 with a 2:2 degree, I was initially employed by Derwent Foods in the production of Phileas Fogg snacks at a particularly exciting time in the company’s development and Profile Food Tech Keeping At W growth. My job involved Quality Assurance and Product Development, liaising with important customers such as Marks and Spencer and Sainsbury’s. After 3.5 years I moved on to Ryvita in Poole, Dorset to work as a Food Technologist, work which soon expanded to encompass Technical Management. At Ryvita I expanded my knowledge of food manufacturing, especially in relation to hygiene and QA related accreditation procedures. I then decided that I would like to work in a different food sector area in order to expand my field of expertise. I secured a position at St Ivel, Wales in the Product Development of cheese and related products. My two years here gave me the opportunity to experience a more centrally run organisation that is dependent on milk supply. It also broadened my awareness of food safety and dairy food related disciplines. After a further spell spent back at Ryvita (to help them deal with specific issues that had arisen and required my experience) I got a job at Safeway Head Office in Hayes. I was first employed as the Technical Manager for Frozen Foods (which ranged from peas to frozen meals) then, following company restructuring, for chilled pastry products; a role that expanded further to include potted salad products and ready meals. These positions again extended my knowledge base and gave me the opportunity to see a variety of processing plants and varied technologies. ● e of a hnologist: g Cool Work PROFILE OF A FOOD TECHNOLOGIST I was promoted to my current position quite recently: it is a new role within the company as Controller of Chilled Foods. This mainly involves food safety issues, strategically choosing suppliers and developing technical relationships with them. This new position requires that I work hard and often for long hours. I am currently involved in the launch of several new products including some in Safeway’s Italian meals range and traditional dishes. However, I find my work rewarding with plenty of advantages and opportunities to build a network of contacts and I enjoy travelling around the country to visit suppliers. My salary is good and if I had my time over again I would still have chosen to work in the field of Food Technology and Food Retailing. I expect that I will still be working in Food Retailing in 5 years time, with an expanded role in a field that continues to promote quality foods and builds strategic partnerships with suppliers using best practice procedures. Based on my experience, my key requirements for a food technology career would be: ■ A passion for food and the aim to work hard. ■ To do well in the retail side of food production and distribution it is beneficial to have a range of experience in different food sectors and product areas in order to fully appreciate supplier issues. WE WILL ALWAYS NEED TO MANUFACTURE AND PURCHASE FOOD AND THERE ARE PLENTY OF VARIED, INTERESTING OPPORTUNITIES IN THIS FIELD. QUESTIONS AND ANSWERS ● Q&A’s Nutritional Aspects of Food Technology 1 Water soluble vitamins such as riboflavin and vitamin C are easily destroyed during processing of foods, for example in the pasteurisation of orange juice or milk. Which of the following help to prevent excessive losses during heat exchanger processing: ■ ■ ■ a: filtration 7 The protein content of raw white rice is approx 6.5 g per 100g, yet the protein content of cooked white rice is approx 2.2 g per 100g. Why is it so much lower for cooked rice? ■ ■ a: the cooking of rice denatures its protein b: protein leaches out into the water during the boiling of rice b: air removal c: low temp/longer time processing 2 ■ c: boiling up rice in water causes it to absorb a lot of water which dilutes its protein content Natural Carotenoids such as lycopenes are popular sources of antioxidant colouring agents in foods nowadays. Which vitamin are these carotenoids associated with in foods? 8 ■ ■ ■ a: Vitamin D b: Saturated b: Vitamin A 9 If a food label has an ‘ff’ sign on it, what does this mean? ■ a: the food in the packet is a good source of c: Vitamin E 3 If a manufacturer wants to declare and promote the fibre content of their food in nutritional labelling information, which other nutrients must also be claimed, legally? ■ ■ ■ a: Energy, protein, fat, carbohydrate 4 When foods are fortified with vitamins, why are buffers often added as well? ■ a: to control the pH to a range which protects the c: Energy, protein, fat, carbohydrate and sodium b: to prevent that vitamin from acidifying and curdling the protein 5 Which of the following additives can be added to oil-containing foods in order to protect them from oxidative rancidity? ■ ■ ■ a: Vitamin E (tocopherols) b: Calcium carbonates c: Ferrous oxide 6 If a food has a nutritional label that claims that it contains 300 mg sodium per 100g of product, how much salt does it have? ■ ■ ■ a: Beneficial: True ■ or False ■ ■ Unsaturated soluble fibre ■ b: the food in the packet is a reasonable source of folic acid ■ c: the food in the packet is a good source of folic acid a: 300 x 2.0 = 600g/100g b: 300 x 2.5 = 750g/100g c: 300 x 3.0 = 900g/100g 10 If you see that ferrous sulphate is included in the ingredients list of a product, which mineral has been added? ■ ■ ■ a: magnesium b: iron c: fluorine 11 If you were a food manufacturer wanting to make a sauce or soup that is rich in Vitamins B, which of the following ingredients would be the best option? ■ ■ ■ a: caramel b: yeast extract c: fish stock 12 In the promotion of certain rehydrating sports drinks the term ‘isotonic’ is used. What does this mean? ■ a: it contains stimulant ingredients, such as caffeine or taurine ■ ■ b: it contains vitamins important for energy production c: it contains mineral salts (eg potassium and sodium) and glucose at dilution/concentration levels that match body cells. 17 ■ Polyunsaturated ■ b: Fat, protein, carbohydrate, sodium stability of that vitamin ■ In health some fats are more beneficial than others. Omega 3 fats are: just 4Food ■ ISSUE 3 SPRING 2003 ● SFE COURSES UPCOMING COURSES How to Raise Achievement in GCSE Food Technology by Developing a Thorough Understanding of New Product Development and the Use of Advanced New and Smart Foods Food Technology covers a diverse range of topics including hygiene, nutrition and new product development. Change in these areas is rapid, reflecting the dynamic, highly competitive nature of the food industry. For busy teachers operating within tight budgets it is often difficult to keep up with new developments and to find quick, interesting and meaningful ways to teach this subject. This practical course for all teachers of Food Technology will provide clear guidance on how to make the link between industrial product development and classroom based learning. Through a range of practical workshops and demonstrations, classroom applications for industrial processes and smart food materials will be clearly explained. In particular the day will clarify: ■ Successful ways of teaching and applying new and smart foods ■ Clear support on how to develop industrial ways of working in Food Technology rooms ■ Tips on how to develop a product design approach to Food Technology ■ Valuable list of resources, industrial contacts and sources of useful information Date: Wednesday Friday Friday Wednesday Friday 05 March 2003 14 March 2003 28 March 2003 14 May 2003 23 May 2003 Area: London Manchester Birmingham London Leeds SUMMER 2003 Keystage 3 TLF Food 3 Rs Food Please visit our website: www.sfe.co.uk or contact Julie Ford on 0117 983 8800 for more information or a booking form. 18 ANSWERS 1 = B – to remove any oxygen from the liquid 2=B 3=C 4=A 5=A 6 = B One part of sodium equates to 2.5 of salt 7=C 8a = True 8b = Usually polyunsaturated 9 = C An average portion provides at least 1/5 of the RDA for folic acid 10 = B 11 = B 12 = B MAKING ICE-CREAM ● k i n a g … M U sing an ice-cream maker is an excellent way of demonstrating to pupils the principles of action involved in a typical unit operation of commercial food manufacture. It clearly and simply shows how SCRAPER HEAT EXCHANGERS work, as they replicate, if only on a very small, batch scale, the sort used in pilot plants and in processing areas of food factories. An ice-cream maker will consist of a bowl (made of a non will be surrounded by emulsifiers and milk proteins. This corrosive material with good heat transfer capabilities eg dispersed phase will be distributed amongst the continuous stainless steel) housed within a freezing unit capable of phase which is made up of a sugar solution. rapidly reducing the wall of the container to less than -12°C. This cold temperature will be rapidly transferred by Overall the manufacture of a good quality ice-cream that conduction and convection through the walls into the ice- keeps well is a complex business and a science in itself. It cream mix. As the mixture freezes against the wall it will be is vital to create an emulsified matrix of tiny fat globules, instantly scraped away and mixed into the remaining liquid surrounded by air bubbles and small ice crystals. This along with air. This scraping action is achieved by a matrix only forms if an ice-cream mix is allowed to ‘rest’ for carefully designed rotating blade that not only wipes the a few hours or overnight so that the ingredients can form freezing surface clean as is sweeps along, but is the 3D structure needed. Then, temperature shaped to fold in air. (See diagram right.) control is vital during scraper heat L AT I O N INSU This process must be quick to exchange chilling. In Industry this type of FREEZANT ensure that only small ice equipment will be of a crystals form and designed to create a mousse type continuous design, where I -C CE REAM M IX the ice-cream mix will be emulsion (of oil and air pumped along a tube in water) or colloid with housed between two the help of naturally other frozen tubes present or added carrying a R O T AT I N G ANNULAR stabilisers or refrigerant. A rotor emulsifiers. Ice-cream within this inner tube is a partly frozen foam, will not only carry the with ice crystals and air bubbles taking up most of the volume of the ice-cream mix along, SC RA PE BLAD but have a scraping ES action to constantly blend product, with a dispersed in air (which is pumped in) phase of tiny fat droplets, and ice as it forms. Using some of which are orientated around the bubbles. Each fat droplet 19 pipes will allow for small volumes to be frozen in a continuous system, just 4Food ■ ISSUE 3 SPRING 2003 ● MAKING ICE-CREAM line. This ice-cream will then be placed in freezers to solidify and harden for many hours at temperatures of -30 to -40°C. Heat exchangers based on similar principles, but using high temperatures, are used for blending margarines (votators), to pasteurise soup, process peanut butter etc. Each will be carefully adapted and designed for their specific functional application, be it to crystallise, gel, plasticize or sterilise. They also link in to other relevant topic areas such as: ■ Hygiene: ice-cream can be a high risk food and requires pasteurisation and strict hygiene controls and procedures ■ Recipe formulation: traditional recipes can be adapted to include industrial (or smart) ingredients such as flavours, colours, stabilisers and emulsifiers ■ Quality assessment: eg taste panels, overrun comparisons (to assess air content) ■ Formulation adaptation to suit an economy or luxury market, make a low fat or vegan product etc ■ Food legislation and labelling regulations relating to icecream (‘dairy’ and ‘non dairy’) ■ Study function of ingredients used and how a stable ! Ice-Cream product is formed ■ Comparison of popular brands etc Recommended ice-cream makers The Gaggia Gelatiera is highly recommended by chefs Ice-cream makers can allow you to make almost any kind and other users, but at a price of over £250, you would of ice-cream or sorbet and owners find them especially need to use it a lot to justify the expense. useful for homemade recipes where only natural Cheaper models may not churn the ice-cream ingredients are used. The only problem with this is that mechanically which can have an adverse effect on the without emulsifiers and stabilisers the texture may texture, but this depends on how well you manually churn deteriorate after a week or so and your homemade it. Choose a make that has a good paddle and looks product can separate, lose its flavour and become gritty. easy to clean and watch in action for classroom use. A More expensive ice-cream makers have built in good booklet with plenty of recipes is always useful too. freezers and motorised churns which are advantageous Expect to pay around £40 for a reasonable model, the to quality, allowing for smaller ice crystal formation, better Prima PIC001 did well in ‘Which?’ Tests and consumer taste and better overruns (lighter texture). They require a reports rate the Krups La Glacière P358 highly. few minutes to chill down before use, and once filled each batch will take 15-25 minutes to freeze adequately. just 4Food ■ ISSUE 3 SPRING 2003 20 MAKING MILK SHAKES ● Making milk shake S tabilisers are categorised with additive E numbers E400-466 and have many functions in foods, eg as humectants in cakes, to replace fat in low calorie foods, to replace the mouth feel in low sugar soft drinks or to bind ingredients together. However, the most important use in commercial food manufacture is in maintaining the quality of emulsions and helping to prevent them from separating. They are usually derived from natural sources such as seeds, pods, plant celluloses, bacterial fermentation or plant exudates and based chemically on complex carbohydrates. A food technologist can Stabilisers exist stabilising actions are by absorbing large choose from the following naturally within foods, and required, extracted and amounts of water into their sources of stabilisers, these foods can be useful treated stabiliser powders structure. It is this action depending on their as ingredients for their will be used. These are which increases the functional suitability to a stabilising properties: usually gum based and viscosity of a liquid, particular application: however if stronger capable of forming gels reducing the movement of particles within the food. They are usually blended MODIFIED STARCHES GELATIN GUM TRAGACANTH GELLAN GUM CARRAGEENAN XANTHAN GUM GUAR GUM CARBOXY METHYL KARAYA GUM PECTINS ingredients in products CELLULOSE (CMC) ALGINATES with emulsifiers to use as LOCUST BEAN GUM which require stabilising, usually oil in water mixtures like sauces and foams such as ice-cream and mousses. It is the combined synergistic action of stabilisers, emulsifiers and size reducing mechanical shearing action (such as homogenisation, colloid milling or very high speed mixing) which reduce the interfacial tensions within the food, thus preventing coalescence of like particles. Therefore it is virtually impossible to prevent the formation of 21 just 4Food ■ ISSUE 3 SPRING 2003 ● MAKING MILK SHAKES using stabilisers separate density layers in organism which produces Method Topics for discussion: a colloid without the use of thick exudates that can be Make the mango pulp by ■ Commercial special carefully chosen purified into a gum. liquidising some tinned additives and equipment. Carrageenan is extracted mango in syrup. Mix the with alkaline from a sugar, skimmed milk seaweed. powder and Frimulsion (if and colloid mills to size using). Add this powder reduce fat globules and Mango milk shake mixture slowly to the water, stabilise such products, Skimmed milk powder 80g mixing thoroughly, then along with emulsifiers Mango Milk shake This milk shake uses real fruit from pureed tinned mango (useful as part of ‘Eat 5’) and stabilised using a ready-made blend Sugar 80g add the cream and liquidise again. Heat the of stabilisers to thicken the Mango pulp product called Frimulsion Cream 50g minutes, then cool and ED2N made by Cesalpinia, Mango or other 2 drops flavouring (optional) add the colouring and specially formulated for such a product. This comprises xanthan and carrageenan gums, the Orange food colouring (optional) former increasing the 200g 1-3 drops, depending on strength of colouring viscosity of a mixture, thus Water preventing the fat droplets Frimulsion ED2N 600mls 1g mixture to 85°C for a few flavouring if using. Leave the milkshakes in the fridge for 15 minutes, then compare for texture, mouthfeel, thickness pasteurisation processes used eg using heat exchangers ■ Use of homogenisers for long life products ■ Compare with bought milk shakes or adapting recipe to a chocolate milk shake ■ Sourcing and use of other stabilisers eg guar gum, CMC or gelatin ■ Labelling implications of stabiliser use (viscosity), stability (separation). from the cream rising to the top or the denser fruit pulp from sinking to the bottom. The later protects the milk protein from curdling due to the presence of fruit acid. To enhance the colour and flavour of the finished product, flavourings can be included and a characteristic colour can be mixed using red and yellow natural food colourings, which both add to the appeal. Xanthan gum is produced by a fermented micro- just 4Food ■ ISSUE 3 SPRING 2003 22 FLAVOURINGS ● What’s you F lavours are made up of thousands of different chemicals, making them complex, diverse and difficult to analyse or copy. There is a growing need for a wider range of flavouring products and variants in flavour profile in order to satisfy consumer demands. Flavourings are tasteproviding additives that are important as ingredients for a huge variety of food products, including beverages, confectionery, dairy products and snacks. They not only give a characteristic and distinctive taste and smell to foods, they can also enhance existing flavours or replace ones lost during processing. Each manufacturer will want to have their own customised flavour blends, which has led to combination flavours and new flavour sources being used. For example, in drinks, citrus flavours still dominate the market, however more unusual 2 flavour blends such as cranberry and apple or lemon and lime are being successfully launched. A flavourist needs to understand the consumer’s perception of aroma and flavour: for example they may appreciate and recognise the flavour of a pineapple sweet or yogurt yet never have eaten the real fresh fruit and the profile of a fruit flavour for a 23 confectionery product will be different to one for a dairy product. Some flavours have more than one dimension, for example peppermint has a cool effect on the mouth yet chilli a hot or even burning effect and cranberries an astringent one. Hot and spicy versions of flavoured snacks and sauces, even drinks, have become very popular of late. A manufacturer can choose from 3 basic types of flavouring substances, NATURAL, NATURE IDENTICAL and ARTIFICIAL. Most of those sold are imitations of a known foodstuff, where flavourists have identified the chemical components of natural flavours using analytical methods such as just 4Food ■ ISSUE 3 SPRING 2003 spectroscopy and chromatography and tried to imitate them. The science of flavour development is complex, requiring experienced flavourists and advanced technology (separation, process flavour technology, fermentation and biotechnology). Artificial flavours are those synthesised from chemicals that do not occur in nature but have similar properties. Although they are often seen as poorer in quality than natural ones, they are often much cheaper and keep better. Other categories of flavourings are used in foods: for example, ‘process flavourings’ can be ones that develop only on heating a food (as with Maillard browning reactions) or ‘smoke flavourings’ made either by extracting the smoke flavour from smoke condensates or by replicating them. Nature identical flavourings incorporate substances that are chemically identical to those found in nature but are put together in a laboratory and ● FLAVOURINGS r Flavour? made synthetically. Natural sources (sometimes referred to as ‘from the named source’ or ‘FTNS’) are often aromatic extracts of fruits, herbs, spices or another botanical source. They usually come in a form such as an essential oil and it is these that are in great demand nowadays. Natural flavourings are traditionally extracts, distillates or macerations. However, ‘natural sources’ can mean that the natural material used may not be the basic material for the flavour in question, they may contain other ingredients to bulk them out or preserve them. Popular new flavours are pure, fresh, ‘FTNS’ flavours with no unpleasant undertones. Exotic fruits and spices or herbs are increasingly used. Mixtures of 2 flavours, one familiar, one unfamiliar are becoming more popular eg lemon and elderflower. Although there is a resurgence in consumer interest and demand for natural flavourings, they are often expensive and therefore more often used in ‘premium’ products. One company who produces innovative natural flavouring oils and extracts is WILD, for example hazelnut and peanut flavours without any food allergenic substances contained. It is often assumed that the main sale of flavourings is for the inclusion in sweet products, however there is a huge demand for savoury flavourings to use in seasonings, boullion powders, sauce bases etc for soups, ready meals, and snacks. Hundreds of different meat or vegetable flavours and extract are available in liquid or powder form ranging from roast beef powder to asparagus extract powder which may be added to a product at a dose of 0.5 – 1.0%. They often incorporate salt and maltodextrins as carriers and where appropriate stabilisers, emulsifiers or ethanol in their formulation. They are usually manufactured using spray drying processing. Developments in technology have allowed for flavour analysis to progress rapidly, equipment such as isotope ratio analysers and electronic noses have are often used in flavour houses to speed things up. Different cheese flavours are being developed by Edlong Flavours for new recipe ideas ready meals or snacks eg Irish cheesy (yeasty and robust), or Swiss cheesy (melted flavour, with kirsch taste). These are available in powder form. Meat analogues often have very little flavour and may have flavourings added to them to make them more interesting or, if appropriate, to replicate the flavour of meat without the use of animal products. This can be achieved using hydrolysed vegetable protein (HVP), yeast products and flavour top notes. For sweet products, traditional flavours like vanilla or chocolate are still very popular, but new, purer natural versions are available as technology permits greater refinement and more sophisticated just 4Food ■ ISSUE 3 SPRING 2003 aromas and tastes. For savoury products technology has permitted the development of flavours reminiscent of traditional cooking methods based on slow roasting, grilling or barbecue. A typical example of success is the development of the flavours used in Sunny Delight drinks. They were carefully blended to be fruity, despite the low fruit juice content, and appealing to the prime market sector that the company Procter and Gamble were aiming for: children, even though they may not be attractive to many adults. Flavour, along with texture and colour, are major criteria in processed food that make us want to buy it. If a manufacturer gets the flavour right a product is likely to be successful and it is modern technology that has allowed for the use of both naturally abundant botanical flavours and the copying of nature in creating authentic flavour profiles. 24 BACK TO BASICS ● BACKTO ■ Geoff Hancock writes about ensuring pupils make the most progress in your lessons TEACHING AND LEARNING IS WHAT SCHOOLS ARE ESSENTIALLY ABOUT. NO SURPRISE THERE THEN; HOWEVER, IT’S EASY TO FORGET THAT BASIC TRUTH GIVEN ALL THE DEMANDS THAT ARE PLACED UPON US. I On the surface this n issue 2 of appears to be a successful just4food, I said lesson. The pupils were that in my opinion, reasonably well behaved, Food Technology they certainly worked quite teachers are the hard and enjoyed the lesson most organised and they successfully produced the dishes. But teachers in any the question is: ‘What did school – they need the pupils actually learn?’ to be. For any If you think about it, practical food teaching in its most basic form is quite a straight lesson to be a success, teachers ‘The pupils entered the room and immediately syllabus for example is need to keep about collected their ingredients, sorted out their tools and merely a list of items that twenty different equipment and began to prepare their practical. The pupils need to learn over a balls in the air at teacher took the register and reminded pupils of the two year period. We as need to work safely, carefully and complete on time. teachers break that down The pupils were producing a trial dish as part of their into a year, a term, a unit, any one time. It is very easy in the GCSE coursework. The teacher was acting as a hurly burly of a facilitator, talking to individuals, reminding them to Therefore the starting wash up as they are going along and generally point of each lesson must practical lesson to forget exactly what it is that we want pupils to learn. That might seem very obvious, so let me give you an example: 25 forward thing: a GCSE keeping them on task. Some of the pupils made a pizza, others simple pasta dishes, one other bread rolls from a bought bread mix. I asked one of the pizza pupils, “have you ever made a pizza before?” “yes” came the reply. “What have you learnt today that you didn’t know before?” I asked, “Nothing” was the reply. The lesson progressed at a brisk pace. Pupils finished their dishes, cleared away and photos were taken. The bell then went, pupils filed out.’ just 4Food ■ ISSUE 3 SPRING 2003 then a lesson. be ‘What do I want pupils to learn today?’ You decide, you share it with the pupils (so they know what’s expected of them), you create a lesson (learning experience) and you test that learning has taken place. It all sounds very easy, doesn’t it? ● BACK TO BASICS BASICS 10 practical tips for effective learning… 1 Have you made it them opportunities to talk plain what you want to you and each other to 6 show their understanding. and evaluating through pupils to learn and is it clearly referenced to your scheme of work? 2 explaining, justifying 9 Use homework to extend learning, not just to finish things off. talk; by doing this learning 4 Break up every will become embedded. lesson into bite size Always start the chunks. Don’t allow lesson by sharing activities to go unchecked: with pupils what you pupils will drift and their expect them to learn in this focus will be lost. lesson. 3 Try to get pupils Stop the pupils after Engage the pupils – 5 teachers generally collect them together, re- 15 minutes or so – talk too much. Just focus them, remind them of because they are quiet your expectations and take 7 Make good use of the plenary: let pupils tell you what they have learnt, you can’t say. All you can be sure of is what you have taught them – it’s not the same thing. 10 Set pupils tests. Regular testing provides valuable feedback for you. Analyse the results and evaluate your own effectiveness. If pupils haven’t learnt what you expected them to, something is wrong somewhere! I believe that tests have a use. For Remember that example, when was the pupils learn in last time you gave pupils a and they can hear you, it the opportunity to share 8 doesn’t necessarily follow individuals’ learning different ways so you need sensory alphabet spelling that they are listening. Give experiences. to vary the way you teach. test? GCSE SYLLABUS – TWO YEAR YEAR TWO YEAR ONE UNIT UNIT UNIT UNIT UNIT UNIT UNIT UNIT WEEK LESSON WEEK Remember the elephant principal when planning – you can eat an elephant as long as you break it into small chunks first WEEK LESSON LESSON OBJECTIVES So, we decided what we want pupils to learn, then we decide how to most effectively teach it. just 4Food ■ ISSUE 3 SPRING 2003 26 R E S U LT S A N A LY S I S ● Results Analysis T he full and detailed statistics for the 2002 exam season are now available. The statistics documented here are taken from the National Summary results, with interesting results that will help you to compare your own school against national performance. The figures for Design and subject’s residual. A English and French is grade lower than Food. Technology overall show residual is a figure that 0.63. In other words two However, girls do very well an increase at both GCSE gives the measure of thirds of all pupils taking in Food, which tends to and Advanced level. The difficulty of a subject. The French will get one grade skew the statistics. Boys’ difference between the figure quoted for each lower than English. The performance suggests that percentage of boys and subject should be same is true for Design they find Food much girls achieving A*-C grade compared to zero, which is and Technology. For harder than girls do. is unchanged at 16%. It is the statistical average. example, Food Technology second only to Art and Therefore, a subject with a has a positive residual The residuals for Design Design (21%) and is still a positive residual, such as (0.12), whereas Graphics and Technology show that major cause for concern. English (0.26), is on the has a negative residual Textiles is statistically the The total entry for all easy side of the line and a (-0.26). Therefore, in easiest subject with a Design and Technology subject with a negative statistical terms Food is residual of 0.14. This subjects was 409,000, residual, such as French easier than Graphics, with compares to residuals of which is virtually the same -0.37 is more difficult. The every third pupil taking -0.4 for Electronics and as last year. Candidates difference between Graphics achieving a Systems and Control entered for Food (more than half a grade Technology fell from difference). The biggest 106,403 in 2001 to 101,893 last year. This represents a 4% fall. The fall is largely accounted for by rises in Textiles and Graphic Products. Whilst there is no statistical evidence to support it, many schools had to withdraw Food Technology at GCSE because of recruitment problems. WHILST THERE IS NO STATISTICAL EVIDENCE TO SUPPORT IT, MANY SCHOOLS HAD TO WITHDRAW FOOD TECHNOLOGY AT GCSE BECAUSE OF RECRUITMENT PROBLEMS. Of particular interest are the tables that show each 27 just 4Food ■ ISSUE 3 SPRING 2003 surprise is possibly the residual for Graphics (-0.26) which is nearly a third of grade lower than Resistant Materials. Given the high number of girls who take graphics (46,323) this suggests that graphics is quite hard. However, as Churchill said ‘There are lies, damned lies and statistics’. ● R E S U LT S A N A LY S I S DETAILED EXAMINATION DATA FOR THE SUMMER OF 2002 Summary of results for Year 11 from NCER data Overall 53% of pupils achieved 5 or more ******* Design and Technology Full Course GCSE Subject entries Title Resistant Materials Food Technology Graphic Products Textiles Electronic Products Systems and Control Engineering Others 2002 110,009 101,893 106,403 47,282 19,653 13,584 2,485 7,699 409,000 2001 112,871 106,165 104,668 45,825 19,979 14,454 3,088 2,472 409,522 2000 108,671 106,650 97,678 44,307 18,549 14,337 3,414 2,961 396,567 1999 105,540 101,115 88,582 41,122 17,051 14,768 3,855 3,265 375,298 Residuals for major GCSE subjects Subject Boys Girls Overall Results Drama Art and Design PE English Music Science (double) Geography D+T Mathematics History Business Studies French 0.59 0.3 0.57 0.16 0.08 0.12 -0.07 -0.19 0.12 -0.21 -0.22 -0.53 0.64 0.55 0.04 0.36 -0.01 -0.22 -0.15 0.17 -0.26 -0.25 -0.21 -0.23 0.62 0.46 0.40 0.26 0.03 -0.19 -0.10 -0.02 -0.07 -0.23 -0.22 -0.37 Design and Technology Full course subject residuals Title Resistant materials Food Technology Graphic Products Textiles Technology Electronic Products Systems and Control Engineering A*-C (%) 45.3 52.6 51.8 61.8 54.6 53.9 54.6 Subject residual 0.03 0.12 -0.26 0.14 -0.32 -0.43 -0.34 Entries 922 12537 A (%) 11.3 11.4 B 16.7 16.9 C 25.4 22.4 D 21.6 20.0 E 14.5 15.7 U 10.0 12.1 A (%) 11.9 11.7 B 25.5 20.4 C 30.0 25 D 20.2 23.3 E 10.4 13.6 U 1.9 4.2 AS Results for 2002 Title Food Technology Product Design Full A Level Results for 2002 Title Food Technology Product Design Entries 470 9257 just 4Food ■ ISSUE 3 SPRING 2003 28 PREBIOTICS ● Helping your bo – the story of prebiotic ingredients ■ Prepared for Just 4 Food by ORAFTI Active Food Ingredients N owadays many people are interested in new ways to improve their health, whether that be by eating more healthily or by increasing the amount of physical exercise they do. It is just as important to look after the inside of our bodies as it is the outside. The digestive system is essential to both physical and mental well-being. If it is working properly, we can get more goodness from the food that we eat and we feel better. The good news is that there are a number of ways in which you can help to keep your digestive system healthy without too much effort! About your digestive system The average digestive tract has roughly the same surface area as a tennis court. Inside a normal, healthy digestive tract you can find more than 1kg of bacteria. In fact, there are more bacteria in your digestive system than cells in your body. Together, these bacteria are known as our intestinal microflora. Not all of these are bad bacteria, in fact around one third of our microflora is made up of ‘friendly’ 29 bacteria. These – known as bifidobacteria – help with digestion and prevent the growth of too many harmful organisms in the intestine. It is very important that the levels of good bacteria in your digestive system don’t drop too low, which can happen if you take antibiotic medication or eat an unhealthy diet for a long period of time. Milk drinks and yoghurts containing live bacteria have become popular recently and many people consume these on a regular basis. These products contain friendly bacteria known as probiotics which top up those already in your intestine. There is another way in which you can help to keep your digestive system healthy – by nourishing your own friendly bacteria. Ingredients which do this job are called prebiotic ingredients. Inulin and oligofructose are prebiotic ingredients and even if these names are not familiar to you, they can be just 4Food ■ ISSUE 3 SPRING 2003 found in many of the foods we eat regularly such as onions, garlic, bananas and chicory. Chicory is a popular food in the north of Europe. The leaves of the chicory plant can be eaten in salads and the roots can be roasted and ground to make a coffee substitute. Inulin and oligofructose are extracted from the root of the chicory plant. When eaten, these prebiotics are not digested by the body: instead they pass all the way through the digestive system until they reach the ● PREBIOTICS dy to help itself colon where they ferment and feed the good bacteria. Helping to nourish your friendly bacteria can have a number of benefits. It is quite logical that if our body is working well on the inside, we will feel better on the outside. Eating prebiotic ingredients can help the body get more of the goodness from our food. Everyone knows how important calcium is to health, but as much as two-thirds of the calcium we eat or drink isn’t actually absorbed by our bodies. Scientific trials have shown that regular consumption of inulin and oligofructose can help to increase the amount of calcium retained by the body. This can help to prevent osteoporosis – a disease which affects the bones. As well as increased calcium absorption, prebiotic ingredients can improve your body’s defence against digestive problems. Diet and lifestyle can contribute to these problems, which include constipation and diarrhoea. Digestive problems are uncomfortable and inconvenient. Prebiotic ingredients can keep your digestive system in balance and help to keep you ‘regular’. Who can benefit from prebiotic ingredients? In short, everyone can benefit from increasing the amount of prebiotic ingredients they consume, for example: Adolescents: Teenagers are particularly in need of calcium, which allows the bones to develop properly and helps protect against osteoporosis in later life. Prebiotic ingredients can help adolescents’ bodies to absorb more calcium from their diet. Busy people: People with busy lifestyles can often have problems with their digestive system, particularly if they aren’t consuming enough healthy foods. Inulin and oligofructose can help to regulate the digestive system and prevent problems such as constipation. This is also relevant during pregnancy, when the body is under increased strain. Older people: As we get older, we can be more aware of digestive problems and the discomfort which results from this. Prebiotic ingredients can help to prevent these problems. It is easy to increase the amount of prebiotic ingredients in our diet and it really can help to improve your sense of well-being. They can be found in a range of products in the UK and appear on the ingredients listings as ‘inulin’, ‘oligofructose’ or ‘fructooligosaccharides’. Because inulin and oligofructose are also classed as ‘soluble fibre’ you can sometimes see this on the listing too. Everyday foods contain prebiotic ingredients, eg yoghurts, spreads, biscuits, soup, fromage frais and smoothies to name but a few! So next time you’re in the supermarket, have a look out for products containing prebiotic ingredients and you can help your body to help protect itself! Probiotics and Prebiotics – what’s the difference? PROBIOTIC: Bacteria which help to balance the microflora in the gut. Found in “little bottles” – fermented milk or yoghurt drinks, and in some brands of yoghurt. PREBIOTIC: Non-digestible carbohydrates which stimulate the friendly bacteria already present in the gut. Prebiotic ingredients, including inulin and oligofructose: occur naturally in chicory, onions, bananas and garlic. These ingredients can also be found added to a range of finished food products such as spreads, yoghurts, dairy drinks and breakfast cereals. Continued overleaf… just 4Food ■ ISSUE 3 SPRING 2003 30 PREBIOTICS ● Helping your body to help itself Continued from previous page… How do prebiotic ingredients work? Colon: Completely fermented Not digested/absorbed Not excreted Why do food and drink manufacturers use inulin and oligofructose? Who makes inulin and oligofructose? As we have seen, these production of prebiotic ingredients offer the ingredients from chicory. manufacturer some ORAFTI is a subsidiary of interesting nutritional the Belgian agro-food advantages if they are group Raffinerie added to their products. Tirlemontoise/Tiense However, inulin and Suikerraffinaderij, part of oligofructose also help the the Südzucker Group. manufacturer in a technical ORAFTI produces sense. Because of their Raftiline® (inulin) and range of advantages, they Raftilose® (oligofructose) can be classed as and fructose syrups from functional food ingredients. chicory roots. ORAFTI’s Inulin is effective as a head office is in Tienen, Belgium and the company a creamy structure which operates in more than 70 can be used in foods to countries, with production provide a smooth units in Oreye (Belgium), mouthfeel which is similar Wijchen (Netherlands) and to fat. This is why we can Wijgmaal (Belgium). The find inulin in low-fat ORAFTI Group also yoghurts, for example. includes REMY INDUSTRIES, world moderately sweet and can leading producer of rice be used, often in starches (Remyline®/ combination with intense Remygel®), rice flours sweeteners, to replace (Remyflo®) and rice sugar in food and drinks proteins (Remypro®). products. Oligofructose is often used in fruit preparations which are added to yoghurts and other desserts. Both ingredients contribute fewer calories than sugar or fat: only 1 to 1.5 kcal/g. Manufacturers use these ingredients to improve the nutritional profile of their products whilst also benefiting from the technical properties of 31 the marketing and replacement for fat, forming Oligofructose is Inulin is effective as a replacement for fat ORAFTI is market leader in inulin and oligofructose. just 4Food ■ ISSUE 3 SPRING 2003 ● CANNINGTON COLLEGE Cannington College Specialist Food Technology Courses Cannington College is a College of the Countryside, situated in Cannington, four miles from Bridgwater, Somerset. Several Food Technology courses and Food Hygiene courses are offered here, either full or part-time. The technical food hygiene services offered can be tailored to individual requirements. Services comply with government legislation regarding food safety. Such services can be offered at your food premises, at the College or at other suitable locations. Technical services are listed below… Food Hygiene Training National Vocational Qualifications (NVQ) for the Food Industry ■ NVQ: Food and Drink Manufacturing Operations (level 1, 2 and 3) BASIC ■ Food Hygiene Awareness ■ Food Hygiene Certificate ■ Essential HACCP Practice Meat Industry Training INTERMEDIATE ■ Certificate in Food Hygiene ■ Certificate in HACCP Principles ADVANCED ■ Diploma in Food Hygiene and Safety Health and Safety ■ ■ ■ ■ ■ ■ Basic Health and Safety at Work Certificate Risk Assessment: Principles and Practice Principles of Manual Handling Principles of COSHH Supervising Health and Safety Certificate Advaced Health and Safety Certificate ■ NVQ: Selling and Distributing Meat, Poultry and Related Operations ■ NVQ: Meat and Poultry Butchery Operations ■ Meat Safety Certificate ■ Beginners Butchery ■ Technical Meat Processing Courses: includes basic butchery, butchery specifications, butchery to add value, HACCP or can be tailored to suit individual needs. Dairy Industry Technical Short Courses ■ Courses in various aspects of the Dairy Industry: eg Basic Dairy Science, Cheese Technology, Yoghurt Technology etc Food Technology Courses Trainers Training ■ Professional Trainers Certificate (CIEH) ■ National Certificate, National Diploma ■ Certificate of Higher Education ■ Foundation Degree Nutrition ■ Certificate in Food and Health ■ Diploma in Nutrition and Health Quality Assurance ■ Routine or ‘one off’ inspections can be carried out in food manufacturing plants, restaurants, pubs and other food areas incorporating guidelines on food handling, premises, routine maintenance, cleaning, pest control, waste management, health and safety and personnel issues. ■ Sensory Evaluation First Aid Training ■ First Aid at Work Certificate ■ First Aid Refresher Course ■ Foundation Degree Individual Services ■ Free advisory service from the Southwest Food and Drink Skills Network. Can advise of training courses in the Southwest and availablility of funding. Can also carry out a free training needs analysis for your business and advise of tailor made training courses. Contact: Emily Wheeler: 01278 655072 For further information on training, please contact: Andy Clennan 01278 655053 email: [email protected] just 4Food ■ ISSUE 3 SPRING 2003 32 SfE 1 Portland Square Bristol BS2 8RR Tel: 0117 983 8800 FaX: 0117 983 8890 E-mail: [email protected] Website: www.sfe.co.uk