Journal
REVISTA CIENCIA AGRONOMICA
Volume 51, Issue 1, Pages -Publisher
UNIV FEDERAL CEARA, DEPT GEOL
DOI: 10.5935/1806-6690.20200006
Keywords
Monolayer; Entropy; Gibbs free energy; Annona muricata L.
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The aim of this study was to model and determine the thermodynamic properties of moisture sorption in soursop fruit powder. The isotherms were determined by the static method at temperatures of 10, 20, 30, 40 and 50 degrees C, and a water activity of between 0.113 and 0.868 (decimal). The GAB model effectively described the moisture sorption phenomenon of soursop powder. The monolayer moisture content ranged from 12.589 to 9.109% db. The enthalpy values related to the GAB model were negative, with -2581.035 kJ kg(-1) for C-0 and -107,758 kJ kg(-1) for K-0. The isosteric heat of sorption, entropy and Gibbs free energy had a high correlation with the equilibrium moisture content, and the correlation between enthalpy and entropy was confirmed for moisture sorption in soursop powder.
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