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Hydration numbers of α-alanine in an aqueous urea solution

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Abstract

Literature data on the apparent molar volumes ϕ of alanine in water and aqueous urea solutions at 298 K are analyzed. It is shown that the slope of the ϕ dependence on the alanine concentration is not dependent on the urea concentration. The standard partial volume of alanine increases linearly with the increase in the urea concentration (wt.%). The structural characteristics of hydrated complexes of alanine (hydration number, molar volume of water inside and outside the hydration sphere, and proper volume of alanine in solution) are given. The hydration number of alanine decreases by a factor of two in passing from water to a saturated (20m) urea solution. The effects of urea additions on the hydration numbers of alanine and glycine are compared.

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Authors and Affiliations

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

    V. P. Korolev

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  1. V. P. Korolev
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Correspondence to V. P. Korolev.

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Original Russian Text Copyright © 2012 by V. P. Korolev

__________

Translated from Zhurnal Strukturnoi Khimii, Vol. 53, No. 1, pp. 176–180, January–February, 2012.

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Korolev, V.P. Hydration numbers of α-alanine in an aqueous urea solution. J Struct Chem 53, 173–178 (2012). https://doi.org/10.1134/S0022476612010234

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  • DOI: https://doi.org/10.1134/S0022476612010234

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