Journal of Chemistry

Journal of Chemistry / 2012 / Article

Open Access

Volume 9 |Article ID 289074 | 8 pages | https://doi.org/10.1155/2012/289074

Effect of Solvent on Protonation Equilibria of L-Proline and L-Valine in 1, 2-Propanediol-Water Mixtures

Received27 Jun 2011
Accepted27 Aug 2011

Abstract

Protonation equilibria of L-proline and L-valine in varying compositions (0.0-60.0% v/v) of 1, 2-Propanediol-water mixtures were investigated pH-metrically. Titrations were performed at 303.0 K and the ionic strength of the medium was maintained at 0.16 mol L-1 using sodium chloride. The best fit chemical models of the protonation equilibria were based on crystallographic R-factor, Χ2, skewness, and kurtosis. All the protonation constants of proline and valine increased with increasing propanediol content. This is attributed to the dielectric constant of the medium.

Copyright © 2012 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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