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Influence of air drying temperature on kinetics, physicochemical properties, total phenolic content and ascorbic acid of pears

Paper ID Volume ID Publish Year Pages File Format Full-Text
19058 43043 2012 9 PDF Available
Title
Influence of air drying temperature on kinetics, physicochemical properties, total phenolic content and ascorbic acid of pears
Abstract

This study was conducted to evaluate quality and structural changes in parallelepipedic pieces of pears during convective drying at different air temperatures (30–70 °C).Submitted to atmospheric O2 conditions, ascorbic acid deterioration demonstrated first-order kinetic behaviour and was found to depend on air temperature and pear moisture content. Loss of ascorbic acid content increased with increasing air temperature. Possible explanation could be the irreversible oxidative reaction occurring during drying. Phenol content degradation fitted a pseudo first-order reaction and was significantly influenced by air temperature.Variations in bulk density, shrinkage and porosity essentially depended on changes in moisture content. Porosity exhibited a nonlinear variation with respect to moisture content. Volume change showed, as expected, a linear variation with moisture content. Drying temperature significantly induced the increase of a* and b* colorimetric parameters due to non-enzymatic browning reaction, which turned the samples more reddish and yellow when the temperature rose.

► Evaluate nutritional and physical qualities in pear during convective drying. ► Phenol content degradation significantly is influenced by air temperature. ► Ascorbic acid deterioration depends on air temperature and moisture content. Possible explanation: the irreversible oxidative reaction. ► Variations in bulk density, shrinkage and porosity depend on moisture content. ► Increase of a* and b* colorimetric parameters due to non-enzymatic browning reaction.

Keywords
Convective drying; Porosity; Total phenolic content; Ascorbic acid content; Volume change; Pear
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Influence of air drying temperature on kinetics, physicochemical properties, total phenolic content and ascorbic acid of pears
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 90, Issue 3, July 2012, Pages 433–441
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