Acta Univ. Agric. Silvic. Mendelianae Brun. 2007, 55, 181-186

https://doi.org/10.11118/actaun200755050181
Published online 2014-11-26

Effect of temperature and water activity on heat transfer in parsley leaves in the  range of temperatures 10–30 °C

Jiří Štencl

Ústav zemědělské, potravinářské a environmentální techniky, Mendelova zemědělská a lesnická univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika

The equilibrium moisture contents of parsley leaves were measured by the gravimetric dynamic method with continuous recording of changes in sample weight. Consequently 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 °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 (qnst) were indicated graphic in the form qnst versus moisture content. Values for isosteric heat of sorption ranged from 54.41 to 46.85 kJ/mol.

References

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