Time-dependent heat capacity of water-lysozyme solution |
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| Authors: | D Bertolini M Cassettari G Salvetti E Tombari S Veronesi G Squadrito |
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| Institution: | (1) Istituto di Fisica Atomica e Molecolare del C.N.R., via del Giardino 7, Pisa, Italia;(2) Salita Sperone, Istituto di Tecniche Spettroscopiche del C.N.R., cont. Papardo, Messina, Italia |
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| Abstract: | Summary We report here the first observation of the time-dependent heat capacity of water-lysozyme solution. The observed increase
of heat capacity in time occurs independently of the lysozyme concentration and thepH value of the solvent. The time necessary to attain the heat capacity equilibrium value and the amplitude of the effect are
not well reproducible; the former tends to increase with temperature, while the amplitude decreases and practically disappears
about 35°C. Evolution of a spatial order of the proteins in water and/or of water molecules interacting with the proteins
is considered as a possible explanation for the results. The phenomenon promises to be an important tool to study the role
of water in biological organization and activity. |
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| Keywords: | Heat capacities of liquids |
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