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Effect of osmosis and ultrasound pretreatment on the moisture adsorption isotherms of quince

Paper ID Volume ID Publish Year Pages File Format Full-Text
19334 43059 2012 9 PDF Available
Title
Effect of osmosis and ultrasound pretreatment on the moisture adsorption isotherms of quince
Abstract

The effect of pretreatment osmotic–ultrasonic dehydration on the sorption isotherms of quince was determined by static gravimetric method at temperatures of 30 °C, 45 °C, and 60 °C. The curves obtained can be considered as type II according to the Brunauer–Emmett–Teller (BET) classification. Adsorption data were fitted into seven isotherm models. The best fit of the experimental data was obtained with Peleg for both fresh- and pretreated dried quince slices.Thermodynamic properties such as net isosteric heat, differential entropy, enthalpy–entropy compensation, and spreading pressure were determined from moisture adsorption isotherm data of quince. The net isosteric heat of sorption and differential entropy decreased with increasing moisture contents in an exponential function. A plot of differential heat versus entropy satisfied the enthalpy–entropy compensation theory. The spreading pressure increased with increasing water activity, and decreased with increasing temperature. The value of net isosteric heat, differential entropy and spreading pressure of untreated samples is higher than that of pretreated samples of quince.

► The effect of pretreatment osmotic–ultrasonic dehydration on the sorption isotherms of quince was determined by static gravimetric method at temperatures of 30 °C, 45 °C, and 60 °C. ► Adsorption isotherms of quince followed the characteristic type II isotherms. ► The net isosteric heat of sorption and differential entropy decreased with increasing moisture contents in an exponential function. ► The spreading pressure increased with increasing water activity, and decreased with increasing temperature.

Keywords
Adsorption isotherms; Mathematical models; Osmotic–ultrasonic dehydration; Quince; Thermodynamic
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Effect of osmosis and ultrasound pretreatment on the moisture adsorption isotherms of quince
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 90, Issue 2, April 2012, Pages 266–274
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