Volumetric properties of proteins and their analogs in diluted water solutions. 1. Partial volumes of amino acids at 15-55 degrees C.

The apparent volumes of 14 amino acids in aqueous solutions at a concentration of 3 mg/ml were measured densitometrically within the temperature range 15-55 degrees C. The accuracy of measurements was +/- 0.3%. The decrease in volume of polar and charged atomic groups as well as the temperature dependences of the partial volumes was analysed. The differences in behaviour between charged, polar and nonpolar atomic groups were considered.