Model comparisons of equilibrium moisture content of prunes in the temperature range of 15-45 degrees C
1999
Stencl, J. | Otten, L. | Gotthardova, J. | Homola, P.
Moisture equilibrium data for adsorption and desorption of water from prunes (Prunus domestica L.) were investigated at temperatures in the range of 15-45 degrees C and water activity ranging from 0.4 to 0.99. The experimental procedure used was a gravimetric dynamic method with continuous registration of sample weight changes. A special laboratory drying device has been developed for the purpose. Sorption capacity decreases as temperature increases. The differences between equilibrium moisture contents at a constant water activity were small in the temperature range measured. Rehydration of the dried material results in hysteresis. Four models available in the literature (Chung-Pfost, Halsey, Henderson, and Oswin) were evaluated to determine the best fit for the experimental data. The modified Halsey equation was a good model for moisture adsorption and desorption of prunes.
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