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Effects of drying and pretreatment on the nutritional and functional quality of raisins

Paper ID Volume ID Publish Year Pages File Format Full-Text
19331 43059 2012 6 PDF Available
Title
Effects of drying and pretreatment on the nutritional and functional quality of raisins
Abstract

The close relationship between the consumption of fruits and health status stems from the nutritional and non-nutritional compounds found in fruits which play a key role in the prevention of different diseases. However, fruit processing and storage greatly affect fruit compounds. The aim of the present work was to study the influence of processing on the stability of macro and micronutrients present in grapes, with a view to recommending products that provide the highest nutritional quality and the best health conditions. The study focused on fruit dehydration treatments. Conventional and microwave-assisted air-drying processes were used to obtain raisins. Dehydration caused a decrease of all grape compounds studied excluding total phenols. Moreover, compared to conventional processing, microwave-assisted drying produced greater losses of ascorbic acid in the grape and increased pectin solubilization with a consequent change in texture. However the microwave-dehydrated samples showed higher antioxidant activity.

► Microwave technique (with NaOH pretreatment) supposes an important reduction in the process time when compared to hot air drying. ► Microwave treatment affected the loss of ascorbic acid and minerals but increased total phenols availability and antioxidant activity. ► The use of microwaves could be recommended to obtain raisins.

Keywords
Microwave; Air drying; NaOH pretreatment; Total phenols; Antioxidant activity; Tartaric acid
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Effects of drying and pretreatment on the nutritional and functional quality of raisins
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 90, Issue 2, April 2012, Pages 243–248
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us