Structural
change of water by gelation of curdlan suspension |
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Authors: | T Hatakeyama C Ueda H Hatakeyama |
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Institution: | (1) Lignocell Research, Tokyo Japan, 112-0015, 2-6-16, Mejirodai, Bunkyo-ku;(2) Otsuma Women’s University, Tokyo Japan, 102-8357, 12, Sanbancho, Chiyoda-ku;(3) Fukui University of Technology, Fukui Japan, 910-8505, 3-6-1, Gakuen |
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Abstract: | Phase transition of water restrained by curdlan suspension
annealed at a temperature from 20 to 110°C was investigated by differential
scanning calorimetry (DSC). The melting temperature of water restrained by
annealed curdlan discontinuously decreased at around 60°C, while the amount
of bound water calculated from enthalpy of melting increased at 60°C,
regardless of water content. Using a highly sensitive DSC, curdlan suspension
with various concentrations was studied. It was found that an endothermic
transition was observed at ca. 58°C in a wide range of concentrations.
The transition observed at 60°C is thermo-reversible and both temperature
and transition enthalpy are constant even after gel formation. Well equilibrated
suspension at a temperature lower than 60°C formed no gel. |
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Keywords: | annealing bound water curdlan DSC gels transition enthalpy |
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