Abstrakt

Transfer entropies of solvation of a series of homologous -amino acids in aqueous mixtures of protic ethylene glycol

S.Roy, K.Mahali, B.K.Dolui

Standard transfer entropies, S0 (i) t  of a series of homologous -amino acids (i) like glycine (gly), dl-alanine (ala), dl--amino butyric acid (aba) and dl-nor-valine (nor-val) from water to aqueous mixture of protic ethylene glycol (EG) with 0, 20, 40, 60, 80 and 100wt%EG compositions have been evaluated at 25C. For this purpose the solubility of the amino acids measured using ‘formol titrimetry’ at 15, 20, 30, and 35C and that of 25C reported earlier. S0 (i) t  of the acids as well as their chemical effects, S0 (i) t ,ch  obtained after correcting for the cavity effects, S0 (i) t ,cav  and dipole-dipole interaction effect, S0 (i) t ,dd  . The chemical contributions of transfer entropies, T S0 (i) t ,ch  of amino acids are guided by the superimposed effects of increased acidity affecting the RCOO- part, decreased basicity affecting the NH3 + part and decreased HbH affecting R group of Zwitterionic amino acids RCH(NH3 +)COO-, and the complex structural interactions of EG-H2Omixtures.