Volume and adiabatic compressibility of amino acids in urea-water mixtures.
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概要
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Apparent molal volumes (φ<SUB>V</SUB>) and apparent molal adiabatic compressibilities (φ<SUB>KS</SUB>) at 25 °C have been obtained for the following amino acids in water and in urea-water mixtures (up to 8 mol kg<SUP>−1</SUP> urea for φ<SUB>V</SUB> and at 3 mol kg<SUP>−1</SUP> for φ<SUB>KS</SUB>) from measurements of density and ultrasonic velocity: glycine, L-alanine, β-alanine, α-aminoisobutyric acid, L-valine, L-serine, and L-threonine. The limiting values φ<SUB>V</SUB><SUP>o</SUP> and φ<SUB>KS</SUB><SUP>o</SUP> were calculated by a linear extrapolation using the least-squares method. These data were used to derive the volumes of transfer and the adiabatic compressibilities of transfer of the amino acids from water to aqueous urea solutions. Both of these transfer functions were positive. The results were interpreted in terms of structure-breaking interaction of urea upon water.
- 公益社団法人 日本化学会の論文
著者
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Ogawa Toshio
Department of Chemistry, College of General Education, Nagoya University
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Mizutani Kiyoshi
Department of Chemistry, College of General Education, Nagoya University
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Yasuda Motoo
Department of Chemistry, College of General Education, Nagoya University
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