Kumara, M. N. and Chenne Gowda, D. and Thimme Gowda, A. and Rangappa, K. S. (2004) Anodically generated manganese(III) sulphate for the oxidation of dipeptides in aqueous sulphuric acid medium: A kinetic study. JOURNAL OF CHEMICAL SCIENCES, 116 (1). pp. 49-53. ISSN 0974-3626
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Abstract
The kinetic of oxidation of dipeptides (DP) namely valyl-glycine (Val-Gly), alanyl-glycine (Ala-Gly) and glycyl-glycine (Gly-Gly), by Mn(III) have been studied in the presence of sulphate ions in acid medium at 26degreesC. The reaction was followed spectrophotometrically at lambda(max) 500 nm. A first order dependence of the rate on both Mn(III)](o) and DP](o) was observed. The rate is independent of the concentration of reduction product, Mn(II) and hydrogen ions. The effects of varying the dielectric constant of the medium and addition of anions such as sulphate, chloride and perchlorate were studied. The activation parameters have been evaluated using Arrhenius and Eyring plots. The oxidation products were isolated and characterized. A mechanism involving the reaction of DP with Mn(III) in the rate limiting step is suggested. An apparent correlation was noted between the rate of oxidation and the hydrophobicity of these dimers, where increased hyphobicity results in increased rate of oxidation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | oxidation; dipeptides; manganese(III) |
| Subjects: | C Chemical Science > Chemistry |
| Divisions: | Department of > Chemistry |
| Depositing User: | Users 23 not found. |
| Date Deposited: | 20 Aug 2019 08:30 |
| Last Modified: | 02 Jul 2022 07:28 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/6640 |
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