Water activity of skimmed milk powder in the temperature range of 20-45 degrees
1999
Stencl, J. Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
Water activity data for adsorption and desorption of moisture from skimmed milk powder were investigated at temperatures in the range of 20 - 45 deg C and moisture content of the material tested from 3.2 to 20 % (wet basis). Four mathematical models of sorption isotherms (Chung-Pfost, Halsey, Henderson, and Oswin) were evaluated to determine the best fit for the experimental data. Water sorption capacity decreased as temperature increased. The critical value of equilibrium moisture content of milk powder tested, corresponding to the water activity equal 0.6, was 11 % (wet basis) at the temperature of 20 deg C. Repeated rehydration of the material brought an increase in the original equilibrium moisture content 3.2 % (wet basis) to 6.3 - 8.1 % (wet basis) in relation to the temperature.
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