Prodigiosin-25 C |
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Authors: | Keiji Harashima Nobuo Tsuchida Junsaku Nagatsu |
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Institution: | 1. Department of Agricultural Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo;2. The Institue of Physical and Chemical Research, Bunkyo-ku, Tokyo |
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Abstract: | The equilibrium constant of the isomerization reaction between d-glucose and d-fructose which is catalyzed by a. glucose isomerase from Streptomyces sp. was obtained by both methods of chemical analysis and of kinetic study over the temperature range of 25° to 70°C.It was found that the formation of d-fructose from d-glucose was an endothermic reaction with the heat of the reaction, ΔH, of +2220 cal/mole. The standard free energy change, ΔG, and the standard entropy change, ΔS, associated with the isomeric change were found to be +180 cal/mole and + 6.8 cal/deg. mole at 25°C, respectively. The values of these thermodynamic quantities at other temperature are also summarized. |
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