Cryoscopic studies of α-amino acids in water

Freezing temperature lowering of aqueous solution of α-amino acids namely glycine, l-serine, l-proline, dl-valine, dl-alanine, l-threonine, hydroxy-l-proline, l-isoleucine and dl-methionine were determined. These values were used in the determination of osmotic coefficient, water activity, activity coefficients and number of ions formed by an electrolyte molecule. Regression analysis was further done for the above-mentioned α-amino acids in order to test the validity of ΔTf (theo.) and ΔTf (obs.).