Water Adsorption Isotherms and Storage Stability of Freeze-Dried Bovine Colostrum Powder |
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| Authors: | Huaning Yu Yuanrong Zheng |
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| Affiliation: | 1. Institute of Refrigeration and Cryogenic Engineering, Shanghai Jiao Tong University , Shanghai , P.R. China;2. Department of Food Science and Technology, School of Agriculture and Biology , Shanghai Jiao Tong University , Shanghai , P.R. China;3. State Key Laboratory of Dairy Biotechnology, Technical Centre, Bright Dairy and Food Co., Ltd. , Shanghai , P.R. China |
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| Abstract: | Moisture adsorption isotherms of freeze‐dried bovine colostrum powder were obtained using the gravimetric method at three temperatures (15, 25, and 35°C) in the water activity range of 0.11–0.86. The moisture adsorption isotherms of freeze‐dried bovine colostrum powder showed a sigmoid isotherm curve typical of the type II BET classification shape. The Guggenheim-Anderson-de Boer and Brunauer-Emmett-Teller models were recommended to fit experimental data well. The shelf life of freeze‐dried bovine colostrum powder packaged in aluminium-laminated polyethylene pouches was evaluated for 243 days, and the storage stability was investigated when stored at 25°C and 50% relative humidity. A slight increase in moisture content, a linear increase in color difference, and a slight decrease in IgG concentration were found within 60 days storage under the above-mentioned conditions. |
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| Keywords: | Bovine colostrum powder Freeze drying Sorption isotherm Storage stability Shelf life |
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