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KMID : 1024619980180040285
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Food Science of Animal Resources
1998 Volume.18 No. 4 p.285 ~ p.291
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Adsorptions Isotherm of Water Vapor for Infant Formula Milk Powders and Calculation of Isosteric Heat
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Min Sang-Gi
Choi Mi-Jung
Lee Sung
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Abstract
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Adsorption isotherms of water vapour for infant formula milk powders manufactured by P. M. and N company in Korea were measured at temperatures between 20, 30 and 40 using COST-90 modified method. Results showed that the isotherms were sigmoidal in shape. The adsorption isotherms of milk powder were depending on the temperature and products. The BET-model were applied and analyzed to compare the experimental value. It was found that the BET-model is fitted with measuring data. Sample P showed the lowest monolayer value and sample N showed the highest. Isosteric heat obtained upon application of BET-model was calculated in this field of temperature using the Clausius-Clapeyron equation. It is suggested that the usage of the BET-model to estimate the heat of water sorption in infant formula milk powder should be in agreement with the results from COST-90 project.
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KEYWORD
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infant formula milk powder, sorption isotherm, isosteric heat, BET-model
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