Abstract
ABSTRACT: We studied the glass-to-rubber transition of a BSA-water-NaCl system using DSC. The Tg was 178–187 K and decreased with increasing NaCl content from 1:9 to 6:4 NaCl:BSA. The specific heat change (ΔCp*, J/((g BSA)K)) at Tg increased as the weight ratio increased from 1:9 to 5:5 NaCl:BSA, as did the change in calculated unfrozen water (UFW). The UFW was also correlated with the amount of NaCl in the glassy region with a correlation coefficient of approx. 6 (mol H2O)/ (mol NaCl), which is comparable to the hydration number of Na+. These results suggest that UFW could contribute to the ΔC at Tg of the BSA-water system.
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