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The influence of drying air temperature on the physical properties of dried and rehydrated eggplant

Paper ID Volume ID Publish Year Pages File Format Full-Text
19247 43053 2013 8 PDF Available
Title
The influence of drying air temperature on the physical properties of dried and rehydrated eggplant
Abstract

Drying processes generally cause volume and surface change of foodstuffs. Information on the porous structure and the mechanical properties of dried food products is needed for determining food quality, process design and estimating properties such as density and moisture diffusivity.In this work we investigated the structural changes induced in eggplant by convective air drying at four different temperatures (40, 50, 60 and 70 °C) and their effect on the subsequent rehydration process. Drying and rehydration kinetic curves were also measured.The changes in physical properties, such as porosity, pore-size distribution and bulk density were determined by Hg porosimetry, scanning electron microscopy and optical microscopy while their effect on the textural characteristics by dynamometric measurements.As expected, the increase of the drying air temperature causes shorter drying times. The drying temperature influences strongly the microstructure of dried samples: the porosity increases with the air temperature, but the structure is better preserved at intermediate temperature (60 °C) as confirmed by the lower firmness values with respect to the other dehydrated samples (40, 50 and 70 °C). In these latter, the longer drying time and the higher temperature, respectively, causes the development of a wrinkled structure. In particular, at 70 °C the structure of dehydrated samples appears totally broken with a consequent faster water uptake during rehydration.

► The eggplant structure is best preserved by air drying at 60 °C than 40, 50 and 70 °C. ► Samples dried at 60 °C showed higher average pore diameter and higher Young's modulus. ► After rehydration the best texture properties are maintained.

Keywords
Air drying; Eggplant; Porosity; Microstructure; Texture; Rehydration
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The influence of drying air temperature on the physical properties of dried and rehydrated eggplant
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 91, Issue 3, July 2013, Pages 249–256
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