Activity and Activity Coefficient of Water in Aqueous Solutions and Their Relationships with Solution Structure Parameters
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概要
- 論文の詳細を見る
The water activity and the activity coefficient of water (γw) were calculated from the freezing point depression by using the Hildebrand and Scott's equation for various. solutions of electrolytes, sugars, alcohols, amide, and urea. The water activity measured from the freezing point depression was very close to that at room temperature, showing that the effect of temperature on the water activity is neglegible. The activity coefficient of water was described well as a function of the solute mole fraction (X_s) by the following equation. γw =exp(αX^2_S+βX^3_S) The parameter α in this equation correlated well with the B-coefficient of viscosity for single-valent electrolytes, with the hydration parameter for nonelectrolytes, and with the number of equatorial-OH groups for sugars suggesting that the solution structure was reflected in this parameter
- 社団法人日本農芸化学会の論文
- 1997-03-23
著者
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NAKAMURA KOZO
Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo
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Matsuo Tomoaki
Department Of Biochemical Science And Technology Kagoshima University
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中村 薫
京大 化研
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中村 厚三
Univ. Tokyo Tokyo Jpn
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Matsuo Takeshi
Department of Internal Medicine, Miyazaki Social Insurance Hospital
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MIYAWAKI Osato
Department of Applied Biologicao Chemistry, The University of Tokyo
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Saito Akiko
Biotechnology Center Toyama Prefecture
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Saito Akiko
Department Of Applied Biological Chemistry The University Of Tokyo
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Nagahama Kazuhiro
Department Of Applied Microbial Technology The Kumanoto Institute Of Technology
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Matsuo T
Department Of Biochemical Science And Technology Kagoshima University
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Nakamura Kozo
Department Of Bioscience And Biotechnology Faculty Of Agriculture Shinshu University
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Miyawaki O
Univ. Tokyo Tokyo Jpn
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Miyawaki Osato
Department Of Agricultural Chemistry Faculty Of Agriculture The University Of Tokyo
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Matsuo Takeshi
Department Of Chemical Engineering Faculty Of Engineering Graduate School Kyushu University
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Nakamura Kahoru
Department Of Nutrition Tokyo University Of Agriculture
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Nakamura Kozo
Department Of Agricultural Chemistry The University Of Tokyo
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