Sorption isotherms, GAB parameters and isosteric heat of sorption

2005 ◽  
Vol 85 (11) ◽  
pp. 1805-1814 ◽  
Author(s):  
Elisabeth J Quirijns ◽  
Anton JB van Boxtel ◽  
Wilko KP van Loon ◽  
Gerrit van Straten
Keyword(s):  
Sorption Isotherms ◽  
Isosteric Heat ◽  
Heat Of Sorption

Sorption isotherms and isosteric heat of sorption for grapes, apricots, apples and potatoes

LWT ◽  
2004 ◽  
Vol 37 (4) ◽  
pp. 429-438 ◽  
Author(s):  
Figen Kaymak-Ertekin ◽  
Atıl Gedik
Keyword(s):  
Sorption Isotherms ◽  
Isosteric Heat ◽  
Heat Of Sorption

Moisture Sorption Isotherms, Isosteric Heat of Sorption and Glass Transition Temperature of Murtilla (Ugni molinae T.) Berry

2014 ◽  
Vol 10 (4) ◽  
pp. 583-594 ◽  
Author(s):  
Kong S. Ah-Hen ◽  
Roberto Lemus-Mondaca ◽  
Karen A. Mathias-Rettig ◽  
Antonio Vega-Gálvez ◽  
Jessica López
Keyword(s):  
Experimental Data ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Moisture Content ◽  
Sorption Isotherms ◽  
Isosteric Heat ◽  
Sorption Data ◽  
Heat Of Sorption ◽  
Ugni Molinae

Abstract Adsorption and desorption isotherms of fresh and dried murtilla (Ugni molinae Turcz) berries were determined at 20, 40 and 60°C using a gravimetric technique. The experimental data obtained were fitted to eight models, namely GAB, BET, Henderson, Caurie, Smith, Oswin, Halsey and Iglesias–Chirife. A non-linear least square regression analysis was used to evaluate the models. The GAB model best fitted the experimental data. Isosteric heat of sorption was determined from the equilibrium sorption data using the Clausius–Clapeyron equation and was found to decrease exponentially with increasing moisture content. The enthalpy–entropy compensation theory applied to the sorption isotherms indicated an enthalpy controlled sorption process. Glass transition temperature of murtilla was determined by differential scanning calorimetry and modelled as a function of moisture content by the Gordon–Taylor equation and as function of water activity by Roos and Khalloufi models, which proved to be excellent tools for predicting glass transition of murtilla.

scholarly journals Moisture sorption isotherms and isosteric heat of sorption of coffee in different processing levels

2010 ◽  
Vol 45 (10) ◽  
pp. 2016-2022 ◽  
Author(s):  
Paulo C. Corrêa ◽  
André L. D. Goneli ◽  
Paulo C. A. Júnior ◽  
Gabriel H. H. De Oliveira ◽  
Domingos S. M. Valente
Keyword(s):  
Sorption Isotherms ◽  
Moisture Sorption ◽  
Isosteric Heat ◽  
Heat Of Sorption ◽  
Moisture Sorption Isotherms

scholarly journals Modeling sorption isotherms and isosteric heat of sorption of roasted coffee beans

2018 ◽  
Author(s):  
Gentil Andres Collazos-Escobar ◽  
Nelson Gutiérrez-Guzmán ◽  
Henry Alexander Vaquiro-Herrera ◽  
Erika Tatiana Cortes-Macias
Keyword(s):  
Moisture Content ◽  
Equilibrium Moisture Content ◽  
Sorption Isotherms ◽  
Isosteric Heat ◽  
Dew Point ◽  
Roasted Coffee ◽  
Sorption Data ◽  
Heat Of Sorption ◽  
Coffee Beans ◽  
Roasted Coffee Beans

The aim of this work was determine the sorption isotherms in roasted beans of specialty coffee at temperatures of 25, 30 and 40 °C and water activities between 0.1 and 0.8 using the dynamic dew point method. The experimental sorption data were modeled using 12 different equations to represent the dependence of equilibrium moisture content with aw and temperature. The net isosteric heat of sorption was determined from the experimental sorption data using the Clausius-Clapeyron equation. The Weibull model satisfactorily modeled the effect of the temperature on the hygroscopic equilibrium in roasted coffee beans (R2adj =0.902 and RMSE = 0.00550 kg·kg-1d.b.). The net isosteric heat of sorption increase with increased moisture content. Keywords: water activity; sorption properties; equilibrium moisture content; hygroscopicity

scholarly journals Moisture sorption isotherms and isosteric heat of sorption of dry persimmon leaves

2014 ◽  
Vol 7 ◽  
pp. 88-94 ◽  
Author(s):  
R. Martínez-Las Heras ◽  
A. Heredia ◽  
M.L. Castelló ◽  
A. Andrés
Keyword(s):  
Sorption Isotherms ◽  
Moisture Sorption ◽  
Isosteric Heat ◽  
Heat Of Sorption ◽  
Moisture Sorption Isotherms
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