ENTHALPIES OF SOLUTION OF GLYCINE IN AQUEOUS-SOLUTIONS OF 1,2-DIOLS AND GLYCEROL AT 25-DEGREES-C

Dissolution enthalpies of glycine in mixtures of water with 1,2-ethane diol, 1,2-propanediol, 1,2-butanediol, 1,2-pentanediol, 1,3-propanedio l and glycerol have been measured at 25 degrees C. The enthalpic pair interaction coefficients of the glycine zwitterion with the polyalcoho l molecule have been determined by using the standard solution enthalp ies of glycine in water and in aqueous solutions of the polyalcohols. The values of the resultant enthalpic interaction coefficients are int erpreted assuming a criterion in the form of the effect of hydrophobic alkyl radicals on the interactions between the hydroxyl groups of pol yalcohols and the zwitterion of glycine.