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Effects of water-alcohol binary solvents on the thermochemical characteristics of L-tryptophane dissolution at 298.15 K

  • Physical Chemistry of Solutions
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Abstract

The enthalpies of L-tryptophane solution in water-methanol, water-ethanol, water-1-propanol, and water-2-propanol mixtures at alcohol concentrations of x 2 = 0–0.4 mole fractions were measured by calorimetry. The standard enthalpies of L-tryptophane solution (Δsol H ∘) and transfer (Δtr H ∘) from water to the binary solvent were calculated. The influence of the composition of the water-alcohol mixture and the structure and properties of L-tryptophane on the enthalpy characteristics of the latter was considered. The enthalpy coefficients of pair interactions (h xy ) of L-tryptophane with alcohol molecules were calculated. The coefficients were positive and increased in the series: methanol (MeOH), ethanol (EtOH), 1-propanol (1-PrOH), and 2-propanol (2-PrOH). The solution and transfer enthalpies of L-tryptophane were compared with those of aliphatic amino acids (glycine, L-threonine, DL-alanine, L-valine, and L-phenylalanine) in similar binary solvents.

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Authors and Affiliations

  1. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, Russia

    V. G. Badelin & V. I. Smirnov

Authors
  1. V. G. Badelin
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  2. V. I. Smirnov
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Correspondence to V. I. Smirnov.

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Original Russian Text © V.G. Badelin, V.I. Smirnov, 2013, published in Zhurnal Fizicheskoi Khimii, 2013, Vol. 87, No. 1, pp. 47–51.

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Badelin, V.G., Smirnov, V.I. Effects of water-alcohol binary solvents on the thermochemical characteristics of L-tryptophane dissolution at 298.15 K. Russ. J. Phys. Chem. 87, 40–43 (2013). https://doi.org/10.1134/S0036024413010020

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  • DOI: https://doi.org/10.1134/S0036024413010020

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