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- Title
Enthalpy characteristics of solution of L-cysteine and L-asparagine in water-alcohol mixtures at 298.15 K.
- Authors
Mezhevoi, I. N.; Badelin, V. G.
- Abstract
The integral enthalpies of solution Δsol H m of L-cysteine and L-asparagine in mixtures of water with ethanol, n-propanol, and isopropanol at a mole fraction of alcohol of up to 0.32 were determined by calorimetry of solution. The standard enthalpies of solution (Δsol H 0) of L-serine and of its transfer (Δtr H 0) from water to a mixed solvent were calculated. The dependences of Δsol H 0 and Δtr H 0 on the composition of water-alcohol mixtures pass through a maximum. The calculated enthalpy coefficients of pair interaction of amino acids with alcohol molecules are positive and increase in the order ethanol, n-propanol, isopropanol. The data obtained were interpreted from the viewpoint of various types of interaction in solution and effect of the amino acid residue on the thermochemical characteristics of solution.
- Subjects
ENTHALPY; THERMODYNAMICS; CHEMICAL reactions; AMINO acids; SOLUTION (Chemistry); SOLVENTS
- Publication
Russian Journal of General Chemistry, 2008, Vol 78, Issue 4, p597
- ISSN
1070-3632
- Publication type
Article
- DOI
10.1134/S1070363208040142