Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10-30 deg C
2007
Stencl, J.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Zemedelske, Potravinarske a Environmentalni Techniky
The equilibrium moisture contents of parsley leaves were measured by the gravimetric dynamic method with continuous recording of changes in sample weight. Subsequently water activity values were determined. Henderson equation was found to be a good model both for moisture adsorption and desorption. Isosteric heat of sorption was defined and determined in the temperature range of 10-30 deg C. Clausius-Clapeyron equation was used to calculate the isosteric heat of sorption since no dependence on temperature in the analysed range was observed. The isosteric heats of sorption ranged from 54.41 to 46.85 kJ/mol.
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