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Effect of processing of dates into date juice concentrate and appraisal of its quality characteristics

Kulkarni, S. G. and Vijayanand, P. and Shubha, L. (2010) Effect of processing of dates into date juice concentrate and appraisal of its quality characteristics. Journal of Food Science and Technology, 47 (2). pp. 157-161.

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Abstract

Date palm (Phoenix dactylifera) is widely cultivated in Kutch district of Gujarat and the fruits are harvested at immature stage before the onset of monsoon to prevent spoilage. The immature date fruits with less commercial value were used for processing into date juice concentrate. Immature dates were crushed and treated with 0.1% pectinase enzyme for 120 min to obtain maximum juice. Date juice was found to be rich in reducing sugars (16.1%) and total sugars (18.3%). Juice was pasteurized at 85°C to inactivate the enzyme, cooled and centrifuged at 3000 rpm to get clear juice. The juice was concentrated in a thin fi lm evaporator to a total soluble solids (TSS) of 76°Brix in 2 passes. Chemical composition of date juice during different stages of concentration was determined. Date juice concentrate was packed in low density polyethylene bags of size (22 cm × 14 cm) and frozen in blast freezer at –40°C and stored at –20°C. Storage of date juice concentrate at –20°C for 6 months indicated no signifi cant changes in TSS, acidity, ascorbic acid, total sugars and pH. Hunter colour lightness L, and redness a values of date juice concentrate decreased whereas b values increased during storage. Date juice concentrate was stable during 6 months storage could be reconstituted for preparing ready-to-serve beverages with acceptable sensory quality.

Item Type: Article
Uncontrolled Keywords: Dates Date juice Juice concentrate Enzyme clarifi cation Date beverage
Subjects: 600 Technology > 07 Beverage Technology > 05 Fruit juice
600 Technology > 08 Food technology > 24 Fruits
Divisions: Fruit and Vegetable Technology
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 16 Sep 2010 06:52
Last Modified: 28 Dec 2011 10:18
URI: http://ir.cftri.com/id/eprint/9670

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