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Type: Artigo de periódico
Title: Water sorption thermodynamic properties applied to persimmon skin and pulp
Author: Telis, VRN
Gabas, AL
Menegalli, FC
Telis-Romero, J
Abstract: Moisture equilibrium data of persimmon skin and pulp were determined using the static gravimetric method. Adsorption and desorption isotherms were obtained in the range of 20-70 degrees C, to water activities (a(w)) from 0.02 to 0.85. The application of the GAB model to the experimental results, using direct nonlinear regression analysis, provided a good agreement between experimental and calculated values. The net isosteric heat of sorption was estimated from equilibrium sorption data, using the Clausius-Clapeyron equation. Isosteric heats of sorption were found to increase with increasing temperature and could be well adjusted by an exponential relationship. The enthalpy-entropy compensation theory was applied to sorption isotherms and plots of Delta H versus Delta S for skin and pulp provided the isokinetic temperatures, indicating an enthalpy controlled sorption process. (C) 2000 Elsevier Science B.V. All rights reserved.
Subject: isotherms
moisture content
thermodynamic properties
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/S0040-6031(99)00379-2
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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