Studies on the isothermal crystallization of D-glucose and cellulose oligosaccharides by differential scanning calorimetry. |
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Authors: | H Hatakeyama H Yoshida J Nakano |
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Institution: | Department of Chemistry, State University of New York College of Environmental Science and Forestry, Syracuse, New York 13210 U.S.A. |
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Abstract: | Isothermal crystallization from the glassy state of D-glucose and cellulose oligosaccharides (e.g., cellobiose, cellotriose, and cellotetraose) has been studied by differential scanning calorimetry. The crystallization of amorphous D-glucose and oligosaccharides was very difficult in the absence of traces of water. Amorphous cellobiose and cellotetraose crystallized far more rapidly than amorphous D-glucose and cellotriose. The activation energy for the crystallization of cellobiose and cellotetraose was approximately 10-12 kJ. mol(-1), while that for D-glucose and cellotriose was approximately 1-2 kJ. mol(-1). An odd-even effect seemed to be associated with the crystallization process of these saccharides. |
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