Food Science of Animal Resources (한국축산식품학회지)

Korean Society for Food Science of Animal Resources (한국축산식품학회)
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Adsorptions Isotherm of Water Vapor for Infant Formula Milk Powders and Calculation of Isosteric Heat

저장온도에 따른 복합조제분유의 등온흡습곡선 및 흡습엔탈피 산출

  • Min, Sang-Gi (Animal Resources Research Center, Kon-Kuk University) ;
  • Choi, Mi-Jung (Animal Resources Research Center, Kon-Kuk University) ;
  • Lee, Seong (Department of Food and Biotechnology, Han Seo University)
  • 민상기 (건국대학교 축산대학 동물자원연구센터) ;
  • 최미정 (건국대학교 축산대학 동물자원연구센터) ;
  • 이성 (한서대학교 식품생물공학과)
  • Published : 1998.12.01
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Abstract

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$^{\circ}C$ 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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