Effect of Solvent on Protonation Equilibria ofL-Proline andL-Valine in 1, 2-Propanediol-Water Mixtures | Zendy

Peketi Bhushanavathi | Zendy; B. Veeraswamy | Zendy; G. Nageswara Rao | Zendy; Uppuleti Viplavaprasad | Zendy

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

Author(s) -

Peketi Bhushanavathi,

B. Veeraswamy,

G. Nageswara Rao,

Uppuleti Viplavaprasad

Publication year - 2011

Publication title -

journal of chemistry

Language(s) - English

Resource type - Journals

eISSN - 2090-9063

pISSN - 2090-9071

DOI - 10.1155/2012/289074

Subject(s) - protonation , chemistry , valine , ionic strength , propanediol , proline , titration , kurtosis , solvent , thermodynamics , aqueous solution , organic chemistry , amino acid , ion , mathematics , physics , biochemistry , statistics

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

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