The freeze-concentrated glass-like transition temperatures (Tg'2s), so-called "ante-melting temperature" or "ice-melting temperature", of tripolyphosphate-sugar aqueous solutions prepared with various sugars (ribose, sorbitol, glucose, maltose, sucrose, and trehalose) were investigated by using differential scanning calorimetry to evaluate the effect of tetrasodium tripolyphosphate on the Tg'2 of sugar aqueous solutions. The Tg'2s of tripolyphosphate-sugar aqueous solutions were higher than those of tripolyphosphate or sugar aqueous solutions and converged in a narrow temperature range of 238 to 243 K. Furthermore, a study of the Tg'2s of tripolyphosphate-glucose aqueous solutions adjusted to various ratios indicated that the Tg'2 increment depended on the ratio and that another glass-like transition appeared at a temperature below the Tg'2 by increasing the ratio of tripolyphosphate. The drastic increase in the Tg'2s of sugars with the addition of tripolyphosphate will be useful for improving the cryostabilization of biomaterials.
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FREEZE-CONCENTRATED GLASS-LIKE TRANSITION;
SUGAR AQUEOUS SOLUTION;
Document Type: Research Article
Publication date: March 1, 2006
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CryoLetters is a bimonthly international journal for low temperature sciences, including cryobiology, cryopreservation or vitrification of cells and tissues, chemical and physical aspects of freezing and drying, and studies involving ecology of cold environments, and cold adaptation
The journal publishes original research reports, authoritative reviews, technical developments and commissioned book reviews of studies of the effects produced by low temperatures on a wide variety of scientific and technical processes, or those involving low temperature techniques in the investigation of physical, chemical, biological and ecological problems.