Review Paper Fragaria × ananassa Duchesne ex Rozier] wine production technology, composition,
Transcription
Review Paper Fragaria × ananassa Duchesne ex Rozier] wine production technology, composition,
Review Paper Natural Product Radiance, Vol. 8(4), 2009, pp.356-365 An overview on Strawberry [Fragaria × ananassa (Weston) Duchesne ex Rozier] wine production technology, composition, maturation and quality evaluation Somesh Sharma*, V K Joshi and Ghanshyam Abrol Department of Postharvest Technology Dr. Y S Parmar University of Horticulture and Forestry Nauni, Solan – 173 230, Himachal Pradesh, India * Correspondent author, E-mail: [email protected] Received 14 April 2009; Accepted 20 June 2009 Abstract Strawberry, Fragaria × ananassa (Weston) Duchesne ex Rozier is an important fruit of family Rosaceae, occupies an important place among the small fruit plants and is grown throughout the world. Deep red in colour with a unique shape, highly perishable fruit has a pleasant flavour. It is rich in vitamin C, sugar, organic acids, anthocyanin, phosphorus, iron, other minerals, vitamins, etc. and its flavour is characterized as fruity, sweet and tart. It is utilized for the production of purees, juice concentrate, juice, jams, preserves and rose red wine. Different methods used to make wine are carbonic maceration, on the skin fermentation and thermovinification. Thermovinification method produces the wine of better quality than the others. The cultivars evaluated for wine production are: ‘Chandler’, ‘Doughlas’, ‘Camarosa’, ‘Elsanta’, ‘Polka’ and ‘Tenira’. Wines from ‘Camarosa’ cultivar are found to have many desirable characteristics such as esters, optimum acidity, redder colour units, alcohol and total phenols, while ‘Chandler’ cultivar had higher amount of ethyl alcohol, more phenols, anthocyanin than other cultivars. The method of vinification has influenced the phenolic content. Different phenolic compounds identified by TLC in wines from all the strawberry cultivars are catechin, epicatechin, quercitin and ellagic acid which are known to play a key role of antioxidants. During maturation various changes took place including increase in esters, a decrease in phenol content whereas ethanol content, TSS and acid remained unchanged. In flavour profiling, out of 14 descriptors attempted, 6 had very high intensity like, alcoholic, phenolic, higher alcoholic, astringency and bitterness and the vegetative, yeasty and earthy were found to have lower intensity. Principal Component Analysis (PCA) has also been applied to the wine. The present paper is presenting an overview on production technology, composition, maturation and quality evaluation of strawberry wine. Keywords: Fragaria × ananassa, Strawberry wine, Carbonic maceration, Fermentation on the skin, Thermovinification, Flavour profiling, Principal Component Analysis, Descriptors, Phenolic compounds. IPC code; Int. cl.8—C12G 1/00 Introduction Strawberry, Fragaria × ananassa (Weston) Duchesne ex Rozier (Family-Rosaceae) is an important small fruit, grown throughout the world. It is deep red in colour with unique shape and flavour. The major strawberry producing countries of the world are USA, 356 Spain, Japan, Poland, Korea and Russian Federation (Fig. 1). The estimated production of strawberries in the world during 2007 was 3822 thousand tonnes7. In India, it is cultivated near the vicinity of metropolitan cities, some areas of Himachal Pradesh, Haryana, Jammu and Kashmir, Uttar Pradesh (Dehra Dun), Maharashtra (Mahabaleshwar), and some other places1-7. Strawberry is rich in vitamin C, iron and other minerals (Table 1). Its Table 1 : Composition of strawberry fruit2-5, 14-17 Constituents Average Range Edible portion (%) Water (%) Total soluble solids (oB) Total sugars (%) Sucrose Fructose Glucose Titratable acidity (%) Organic acids (mg/100g) Citric Malic Ascorbic Succinic Tartaric Pyruvic Shikimic Total phenols (mg/l) Protein (%) Total anthocyanin (mg/l) Minerals(mg/100g) Potassium Sodium Calcium Magnesium Iron Zinc 97 89.9-92.4 7-10.2 3.3-9.1 0.2-2.5 1.7-3.5 1.4-3.1 0.52-2.26 420-1240 90-680 26-120 100 17 5 Trace 58-210 0.23 55-145 130 6 13 8 0.6 0.2 Natural Product Radiance Review Paper evaluation of strawberry wine is being presented in this paper. 1,200 1,000 Wine production technology 800 600 Production 000MT 400 200 0 USA Russia Span Turkey Korea Japan Poland Mexico Germany Ezypt Fig. 1 : Top ten strawberry producing countries flavour is characterized as fruity, sweet and tart. The aroma notes are floral, green strawberry, caramel and fruity in nature. The major constituent like other fruits, however, is water whereas phenolic compounds such as quercitin, catechin, chlorogenic, ferulic and ellagic acid are present in the fruits and its wine. Strawberry aroma is mainly determined by a complex mixture of esters, aldehydes, alcohols and sulfur compounds. Esters are responsible for imparting the fruity and floral notes to the fruit. Ethyl and methyl esters are qualitatively and quantitatively, the most important class of volatile compounds present in strawberry flavour and aroma8-13. Strawberry fruits are delicious but highly perishable needing immediate utilization as dessert fruit or processed product. Different cultivars of strawberry (Plate 1) are used for preparation of purees, juice concentrate, juice, jams, preserves and preparation of alcoholic beverages including strawberry wine. The cultivars ‘Chandler’, ‘Doughlas’ and ‘Camarosa’ are used for making wine, however, ‘Camarosa’ was rated superior to ‘Chandler’ and ‘Doughlas’. Other cultivars, viz. ‘Elsanta’, ‘Polka’, ‘Jewel’, Vol 8(4) July-August 2009 ‘Honeoye’ and ‘Tenira’ are suitable for processing purpose. Strawberry flavour is used extensively in the food industry for the production of beverages, confectioneries, bakery fillings, yoghurts, ice creams, cake mixes, etc1-6. An overview of the relevant literature on the preparation technology, composition, maturation and quality a b c Plate 1: Different fruit cultivars suitable for strawberry wine production — a: Camarosa; b: Chandler; c: Doughlas The estimated world production of wine during 2008 was 26444 thousand tonnes out of which Italy alone produced 5050 thousand tonnes7. Theoretically, wine can be prepared from any fruit having fermentable sugars and nutrients required for fermentation and different fruits have been utilized in wine production including strawberry1, 4, 5, 18-25. Production process Unlike grapes, the fruits of strawberry are highly acidic in nature like plum or apricot. But they possess colour to make wine of appealing colour. From methodology point of view, preparation of strawberry wine resembles with stone fruits. To make a palatable wine, dilution of pulp with 50% water is the alternative available to reduce its acidity4,5. Besides, the fruit is pulpy and thus, its dilution is carried out to make wine since the fruits have lower sugar content than the grapes thus, ameliorating the pulp to the desired level is essential. A method for preparation of rose red strawberry wine has also been described4. For strawberry wine, dilution of heated berries with 50% water at 60-65°C for 5-6 min and raising the TSS after crushing to 24oB produced wine with acceptable sensory quality. Pasteurized and depectinized red raspberry wine by addition of 100ppm of liquid pectic enzyme was most acceptable from sensory and colour stability point of view25. Unit operations for the production of strawberry wine with the thermo357 Review Paper vinification method1 are shown in flow chart (Fig. 2). Pretreatments: In strawberry like grapes to prepare quality red wine, several processes like crushing, carbonic maceration, thermovinification and fermentation on the skin are practised1,5,18,26. Crushing: Strawberries were destemmed, crushed and SO2 50 ppm was added and the pulp was diluted with 50% water1, 5. STRAWBERRY Carbonic maceration: FRUITS Carbonic maceration is very ancient but technically a Washing simple process. For the last half a century, it has come Thermovinification under close scientific scrutiny in Southern France27. Water The berries were filled in the tank, which was Heating (5-6 min at sealed and flushed thoroughly 60-65°C) for 10 min and CO2 gas was introduced by connecting a Pressing pipe to the bottom of the tank (Plate 2). After flushing Juice with CO2, pressure in the tank was adjusted to about 15lbs and was held at 27°C Must (24° B) for the duration of the treatment 1,4. Vinification involving longer CO 2 maceration time proved suitable to prepare mellow red wines. The longer carbonic maceration time (14-20 days) considerably increased the phenolic constituents of the wine28. Amerine and Ough29 reported that the fermenting must under strongly reducing (low oxygen) conditions or in the pressure fermentations have slightly higher alcohol levels. Benard et al30 found that holding whole grapes under CO2 pressure slows down fermentation and consequently, helps in preventing an undue rise in temperature. Thermovinification: Thermovinification is used to improve colour extraction from weakly coloured grape cultivars 31. In addition, thermovinification favours the wines which initially are deeper in colour than their traditionally fermented counterparts, although clarification may be slower Fermentation After completion of fermentation X Siphoning (2-3 times) Maturation Add 50 ppm SO2 X Filteration a Bottling and Corking Pasteurization (62°C for 20 min) Strawberry fruit wine Fig. 2 : Flow Chart showing unit operations for the production of strawberry wine with the thermovinification 358 b Plate 2 : Carbonic maceration (a) macerated fruits; (b) wine Natural Product Radiance Review Paper because of increased phenolic extraction. Wrolstad et al32 found that blanching improved the colour stability of strawberry juice. The strawberry wine of cv. ‘Camarosa’ prepared by thermovinification (heating of berries at 65-70°C in 50% water for 5-6 min) have better physico-chemical and sensory characteristics than carbonic macerated wines and fermented with the skin wine1,4,5. Joslyn and Goldstein 33 observed that heating of berries at 74oC for 1min was sufficient for colour extraction in carginane grapes. Fermented on the skin: For production of red table wine, the crushed grapes should be fermented along with their skin for some time i.e. until reasonable amount of colour gets extracted to impart the wine dark red colour21. Sims and Bates34 reported that maximum colour and anthocyanin extraction occurred within four days of skin fermentation at optimum maturity of fruits but continued through 6 days with later maturity fruits. However, the wines had less muscadine aroma and were more astringent. Sharma1 and Joshi et al 5 prepared strawberry wine by fermentation on the skin. The berries were washed, destined and mixed with 50% water in a 5lt flask containing SO2 (50 ppm), DAHP (0.1%) and yeast. But the yeast culture (activate) was added after 24h and initial TSS was raised to 24°B. The berries were kept for 4 days and then the pressed juice was fermented to dryness. Physico-chemical characteristics of wine A typical wine contains sugars, acids, ethyl alcohol, higher alcohols or fusel oils, tannins, aldehydes, esters, Vol 8(4) July-August 2009 amino acids, minerals, vitamins, anthocyanin, fatty acids, minor constituents like methanol, a number of flavouring compounds, etc. Physicochemical characteristics of strawberry wine are summarized in Table 2. Table 2 : Physico-chemical characteristics of strawberry fruit wine1,4,5 Characteristics Range Total soluble solids (°B) Titratable acidity(%) Volatile acidity (% A.A) Ethanol (% v/v) Total esters (mg/l) Total phenols (mg/l) Colour - Tintometer colour units (TCU) 8.1-9.6 0.63-0.73 0.027-0.030 10.3-10.8 84.1-99.1 126.8-142.3 9.93-12.97 15.25-18.53 Titratable acidity is an important characteristic varying between 0.63 to 0.73 per cent (Table 2). Carbonic macerated wines have less titratable acid (0.63%), malate and tartarate concentration1,5,29,30,35,36 and thermovinified (0.73%) has highest and found in wines from ‘Doughlas’ cultivar. Effect of cultivars on physico-chemical characteristics of wine have also been reported by various workers (Table 3). Ethanol It is the component on which the type of wine can be characterized. Sharma, 2000, Joshi et al, 2005 and Joshi et al, 2006 also reported slightly higher yield of alcohol in strawberry wine1, 4, 5. The alcohol in different wines was recorded in the range between 9.2 to 11.5 per cent. Further, longer period of carbonic maceration gave lower alcohol Table 3 : Effect of cultivars on physico-chemical characteristics of strawberry wine38 Characteristics ‘Camarosa’ ‘Chandler’ ‘Doughlas’ TSS (ºB) Total sugars (%) Reducing sugars (%) Titratable acidity (% Citric acid) pH Colour (Red) (Yellow) Alcohol (%v/v) Higher alcohol (mg/l) Volatile acidity (% Acetic acid) Esters (mg/l) Phenols (mg/l) Anthocyanins (OD/ml of wine) 9.7 1.7 0.135 0.65 8.1 0.6 0.124 0.73 8.8 1.0 0.128 0.65 3.18 14.38 17.40 11.2 155 3.21 10.72 19.33 11.5 169 3.26 9.45 14.85 9.2 151 0.026 0.032 0.025 90.9 144.7 0.150 78.3 129.8 0.145 102.4 135.2 0.104 359 Review Paper concentration than shorter period of carbonic maceration37. ‘Chandler’ cultivar was found to contain highest ethanol content (11.5%) (Table 3). Not only this, red wines often have lower alcohol levels than white wines with the same initial sugar content26. Higher alcohol The formation of higher alcohol is the important criteria on which the acceptability of wine depends. The formation of these characteristics during fermentation is closely related to the type of yeast, cultivar of fruits and conditions during fermentation1,4,5,18. Higher alcohols in wines are formed due to amino acid biosynthesis from carbohydrates or directly from existing amino acids by deamination and decarboxylation 18. Strawberry wine prepared by different methods, ranged from 154 to 162 mg/l while in different cultivars it ranged from 151-169mg/l1,4,5 and the highest higher alcohols (169mg/l) was found in thermovinified wine from ‘Chandler’ cultivar (Table 3). period 18,39. In strawberry wine also thermovinification yielded higher content of phenols followed by wines prepared by fermentation on slices, carbonic maceration and control1,4,5. Total phenols (mg/l) in different strawberry wine are shown in Table 4 while the types of phenolic compounds are listed in Table 5. Esters The esters in wine are formed as a result of esterification of alcohols with the respective acids18. The total esters in strawberry wines of different cultivars ranged from 78.3 to 102.7mg/l (Table 3) and in wines prepared by different methods ranged from 84.1 to 99.1 mg/l1,4,5. In general esters have fruity and floral impact characteristics that are Colour intensity Wines made from more mature fruits had greater colour intensity and higher levels of anthocyanins 34. Anthocyanin content in carbonic macerated free run wines showed higher value compared to those skins fermented or pressed wines. Overripe fruits of ‘Bentom’ and ‘Totem’ cultivars of strawberry with higher anthocyanin and total phenolics gave wines with better colour than fully ripe fruit25. Table 4 : Total phenols (mg/l) in different strawberry wine40. Cultivars ‘Camarosa’ ‘Chandler’ ‘Doughlas’ Mean Tannin important in sensory properties of wine26. The strawberry wines prepared by carbonic maceration have higher content of esters than wine prepared by thermovinification or fermentation on the skin1,4,5. Treatment Control Thermovinification Carbonic maceration Fermentation on the skin Mean 139.7 117.0 123.7 126.8 150.2 137.5 146.0 144.5 138.7 131.5 128.2 132.8 150.3 133.2 143.2 142.2 144.7 129.8 135.2 Amount of tannin in wines varied from 100 to 200 mg/l depending upon the type of wine, yeast, fermentation conditions, containers and the maturation CD(P≥0.05)= Treatment, 3.94; Cultivars, 3.41; Treatment ×Cultivars , 4.82 Table 5 : Identification of phenolic compounds in strawberry wine40 Type of phenols RF Control Catechin Epicatechin Quercitin Ellagic acid 0.48 0.54 0.70 0.68 +1-3 +1-3 +1-3 +1-3 Thermovinified wines +1-3 +1-3 - Fermented on the skin Carbonic maceration +1-3 +1-3 +1-2 +1-3 +1-3 +1-3 +1-3 +1-3 +, Present; -, Absent 360 Natural Product Radiance Review Paper Biochemical changes during ageing/maturation of wine Ageing is divided for convenience into minimally oxidative maturation (before bottling) and strictly reductive ageing (after bottling). Maturation involves several independent events that improve wine quality41. In general, the maturation of strawberry wines improved the quality of wines 1,4,5,40 and shown effect on contents, volatile acidity, higher alcohols, colour and esters. Alcohol In general alcohols in wines react with organic acids like tartaric, malic, succinic and lactic acid to form esters which have been reported to increase with ageing of wines17. During maturation of strawberry wine for nine months, a nonsignificant decrease in alcohol content took place1,4,5 which might be due to the reaction of alcohol with acids to form esters18,26. Volatile acidity The concentration of total volatile compounds also increased during fermentation as well as in storage. During ageing, acetic acid (volatile acidity) can result from the coupled oxidation of wine phenolics to yield peroxide which in turn oxidizes ethanol to acetaldehyde and subsequently to acetic acid 26 . In strawberry wines during maturation of 9 months an increase in volatile acidity was reported as the cultivar behaved differently registering either a decrease or increase. The wines made from different methods (thermovinification, carbonic maceration and fermentation on skin) also registered enhancement of volatile acidity (0.024 to Vol 8(4) July-August 2009 0.032 %) due to ageing but remained in reactive phenolics and anthocyanin was found to be a major cause of colour the legal limit1,4,38. deterioration in strawberry preserves45. Higher alcohols During ageing of red wines, both coloured Higher alcohols were formed and non-coloured phenolics are reported throughout the fermentation and have to play important roles and durable been found to be closely related to aroma quality is associated with high phenolic and taste of wine42,43. In strawberry wines content46. These phenolic compounds during maturation of 9 months, higher undergo a number of transformations alcohols decreased slightly38. The fusel oil depending upon the temperature, sulfur formation is the result of transamination dioxide concentration, degree of of corresponding amino acids due to oxidation, time and the anthocyanate to which initially there were more alcohols, tannin ratio26. In strawberry wines of but with maturation these were used for different treatments (control, ester formation, hence decrease thermovinification, carbonic maceration occurred26. Thus, loss of higher alcohols and fermentation on the skin) decrease to form esters is desirable for better in total phenols was recorded during sensory properties of wines. maturation 1,38 . The content of the anthocyanins decreased and that of Colour changes polymeric pigments increased in During maturation, decrease in thermovinified, carbonic macerated and tannins due to complexing of tannins with fermented on the skin wines. protein and polymerization takes place. Thermovinified and carbonic macerated Due to these changes, some of molecules wines, however, increased in colour become so massive that they precipitate, despite the anthocyanin losses47 (Plate 3). resulting in slow smoothening of the Condensation reactions occur between taste18,44. The most documented changes anthocyanins and tannins which form that occur during ageing are those anthocyanate complex, leading to intensiaffecting colour. The polymerization of fication toward purple or tile red hues48. a b c Plate 3 : Strawberry wine after different treatment; (a): thermovinified wines; (b): carbonic macerated wines; (c): skin fermented wines 361 Review Paper Esters Esters have fruity and floral impact and are important in sensory properties of wines. In addition to the esters contributed by fruit, esters are also formed as a result of reaction between acetate and ethanol as well as other higher alcohols or from ethanol by reaction with straight chain fatty acids precursors26. In strawberry wines of three cultivars (‘Chandler’, ‘Camarosa’ and ‘Doughlas’) prepared by different methods on increase in ester content was reported during maturation of 9 months1, 38. Increase in total esters during maturation is attributed to the phenomenon of ageing that is desirable for the development of proper flavour. Sensory qualities Appearance, colour, aroma, taste and subtle taste factors such as flavour of wine constitute the quality18. Sharma1, Joshi et al5 and Joshi et al4 reported that aroma and taste of wines is very complex and depend on a number of factors such as cultivars, agricultural land, vinification practices, fermentation and maturation (Table 6). Beelman & Mcardle35 and Carroll36 reported that carbonic macerated young wines are softer, tasting and possess a special spicy odour which is not present in wines made by traditional methods. A cooked or dried fruit like odour is also present, but a cinnamon like odour was predominating. Thermovinified young red wines were found to be less harsh and astringent26. Flavour profiling In strawberry wines out of the 14 descriptors attempted for evaluating flavour profile only 6 had very high intensity (strawberry like, alcoholic, phenolic, higher alcohol, astringency and bitterness) and remaining (vegetative, yeasty and earthy) were found to have lower intensity1,49. It is further elaborated that the method of preparation of wine affected the flavour profile of strawberry wine. The flavour profiling of wines of various treatments and cultivars by descriptive analysis (Table 7) show that the flavour attributes like vegetative, alcoholic, fruity, vinegary, all spice like, earthy, bitterness, sweety, astringency, sour, yeasty, phenolic, higher alcoholic and strawberry like were the significant terms. The mean intensity ratings for the three cultivars and four treatments were plotted on a polar coordinate or “cobweb” graph (Fig. 3) using 14 descriptors which differed significantly across the cultivars and treatments. ‘Camarosa’ and ‘Chandler’ has significantly higher flavour intensities than ‘Doughlas’ for alcoholic, vinegary, astringency, sour phenolic and strawberry like but lower than ‘Doughlas’ for fruity and higher alcoholic whereas, all the 3 cultivars had almost the same intensity for yeasty descriptor. ‘Chandler’ however, differed from ‘Camarosa’ and ‘Doughlas’ in having higher intensity for bitterness, vegetative and earthy descriptors. However, Table 6 : Comparison of sensory scores of strawberry wine of different treatments1 Attributes Treatments (mean score) Maximum score Control Thermovinification Carbonicmaceration Fermented on skin Colour Aroma and bouquet Appearance Volatile acidity Total acidity Sweetness Body Flavour Bitterness Astringency Overall acceptability 2.0 4.0 2.0 2.0 2.0 1.0 1.0 2.0 1.0 1.0 2.0 1.35 3.42 1.42 1.49 1.57 0.68 0.58 1.24 0.57 0.64 1.62 1.51 3.58 1.58 1.53 1.55 0.71 0.74 1.75 0.68 0.66 1.76 1.15 3.72 1.39 1.36 1.70 0.68 0.70 1.57 0.70 0.68 1.66 1.40 3.46 1.29 1.32 1.54 0.66 0.68 1.63 0.68 0.67 1.66 Total score 20 14.58 16.05 15.31 14.99 362 Natural Product Radiance Review Paper 6 Strawberry like ‘Camarosa’ and ‘Doughlas’ differed in having higher intensity of sweety descriptor. Based on Principal Component Analysis (PCA) it was found that strawberry like attribute exerted maximum influence on PC-I, while the PC-II was affected by sweety attribute49. Alcoholic 5 Higher alcoholic 4 Vinegary 3 Phenolic Fruity Conclusion Yeasty All spices like Sour Control Thermovinification Carbonic maceration Fermented on skin Earthy Astringency Bitterness Fig. 3 : Effect of treatments on the flavour profiling of strawberry wine Table 7 : Details of descriptors and summary of analysis of variance of strawberry wines from different cultivars and treatments49 Treatment No Descriptor 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Vegetative Alcoholic Vinegary Fruity All spices like Earthy Bitterness Sweety Astringency Sour Yeasty Phenolic Higher alcoholic Strawberry like 14. Standard F value Strawberry fruits being rich in several nutrients especially phenolics with red colour due to anthocyanins hold promise for production of quality red wine with medicinal properties. Different methods of vinification influenced both physico-chemical and sensory characteristics of the wines produced. The strawberry wine prepared by thermovinification is better treatments to produce rose red wine. In strawberry wine the presence of phenolic compounds imparted the antioxidant properties and the phenolic composition can be modified by choosing the appropriate method of wine production. Sensory attributes discussed in this paper can describe the strawberry wine of variable quality. References Shredded cabbage pieces Ethyl alcohol (8% v/v) Vinegar diluted 25 times Raspberry essence Spices extract (diluted) Bentonite (0.5%) Tea leaves extract Sugar solution (2%) Aonla extract Citric acid (0.8%) Fermenting must Tannic acid (100 mg/l) Propyl alcohol (1%) 6.58* 10.50* 4.69* 13.75* 9.27* 10.20* 5.33* 22.07** 5.59* 25.09** 5.33* 13.83* 10.91* Strawberry jams 10.34* **Significant at 5% level of significance, * Significant at 1% level of significance Vol 8(4) July-August 2009 1. 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