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Citation: YE Xiu-Dong, ZHOU Guo-Yan, HUA Ze-Zhao. A new Method for Measuring the Glass Transition Temperature of the Maximally Freeze-concentrated Glucose Solution by DSC[J]. Acta Physico-Chimica Sinica, ;2006, 22(11): 1347-1352. doi: 10.3866/PKU.WHXB20061109 shu

A new Method for Measuring the Glass Transition Temperature of the Maximally Freeze-concentrated Glucose Solution by DSC

1.
Institute of Cryomedicine and Food Refrigeration, Shanghai University of Science and Technology, Shanghai 200093, P. R. China

Received Date: 11 May 2006
Available Online: 6 November 2006

The new concept of the glass-transition temperature of the partially freeze-concentrated solution (Tgf) is brought forward and a new method is given for measuring Tgf of 20% and 45% glucose solution using differential scanning calorimetry (DSC), which is based on annealing samples for long periods of time at different temperatures. The influence of annealing temperature on Tgf is studied. It is found that the Tgf increases initially with annealing temperature up to −50 ℃, and decreases as the temperature continues to increase, and exhibiting a od linear relation in both cases. The same phenomenon was observed for glucose solutions of different concentrations. It is concluded that the Tg′ (glass transition temperature of the maximally freeze-concentrated solution) can be determined from the intersection of the two curves reflecting the Tgf change with annealing temperature. The optimal annealing temperature(−50 ℃) and accurate glass transition temperature(Tg′, −55 ℃） of glucose solution are obtained.
- Glass transition temperature of the maximally free-concentrated solution;Glucose;DSC;Annealing;Glass transition temperature of the partially free-concentrated solution
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