EFFECT OF WATER CONTENT, TEMPERATURE AND STORAGE ON THE GLASS TRANSITION, MOISTURE SORPTION CHARACTERISTICS AND STICKINESS OF β -CASEIN

摘要

Moisture sorption isotherms at + 4 deg. C and + 22.5 deg. C were obtained for β-casein after isolation and after 9 months of storage at - 29 deg. C and +22.5 deg. C. Glass transition state diagrams (T_g vs. Moisture) were determined for β-casein after storage. The results showed that effects of storage temperature on moisture sorption isotherms were varied; however, at any a_w differences in moisture content were small (< 0.03 g H_2O/g solids at high a_w).