Abstract
The densities and heat capacity ratios of aqueous solutions of c-glycylglycine,c-alanylalanine, and c-sarcosylsarcosine have been measured at 15, 25, 40, and55 °C. These data have been used to calculate apparent molar volumes andapparent molar heat capacities, which, in turn, have been used in the calculationof partial molar properties at infinite dilution. The merits of using thesethermodynamic data in the calculation of glycyl group and alanine side chain groupcontributions are discussed with respect to the modeling of the thermodynamicproperties of denatured proteins in aqueous solution. The study concludes thatc-glycylglycine may not be the most suitable model compound from which toobtain the thermodynamic properties of the glycyl group. However, it alsoindicates that the cyclic dipeptides merit further investigation with respect to thethermodynamic properties of protein side chains.
Published Version
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