Abstract
The solubilities of amino acids (Glycine, α-alanine, L-asparagine, L-methionine, L-proline, L-valine, L-leucine, L-phenylalanine, L-glutamine) in dioxane-water mixtures (0-100%) have been determined colorimetrically as well as pH metrically using acid-free formaldehyde solution. The solubility decreases enormously with increase in percentage of dioxane. The results have been interpreted in terms of specific solvation and hydrophobic effects.In order to comprehend the results better, the scaled particle theory has been applied to determine the transfer free energy changes for interaction from water to aquo-organic solvent mixtures and the results are qualitatively in agreement. An estimate of the hydrophobic interactions due to constituent groups in different aquo-organic mixtures has been attempted.
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