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- Title
Thermochemistry of glycyl- DL-α-alanine dissolution in water-alcohol solutions at 298.15 K.
- Authors
Mezhevoi, I. N.; Badelin, V. G.
- Abstract
Integral enthalpies of glycyl- DL-α-alanine dissolution in aqueous solutions of ethanol, 1-propanol, and 2-propanol at concentrations of alcohols up to 0.4 mol fraction were measured by the calorimetry method. Standard values of the enthalpies of the peptide dissolution Δsol H 0 and transfer Δtr H 0 from water in mixed solvents were calculated. Dependences of the thermochemical characteristics of glycyl- DL-α-alanine dissolution on the concentration of cosolvents are of an extreme character. Within the limits of McMillan-Mayer’s theory enthalpy coefficients of pairwise interactions ( h xy ) of the studied compound with molecules of alcohols were calculated. They have positive values increasing in the series ethanol, 1-propanol, 2-propanol. The effect of the structure of dipeptides and composition of water-alcohol solvents on the dissolution enthalpy characteristics was considered on the basis of the obtained experimental and calculated data.
- Subjects
ALANINE; ALCOHOL; WATER; ENTHALPY; THERMOCHEMISTRY; CALORIMETRY
- Publication
Russian Journal of General Chemistry, 2008, Vol 78, Issue 10, p1893
- ISSN
1070-3632
- Publication type
Article
- DOI
10.1134/S1070363208100113