Mechanism of Oxidation of L-Histidine by Heptavalent Manganese in Alkaline Medium
The kinetics of oxidation of L-histidine by manganese(VII) in aqueous alkaline medium at a constant ionic strength of 0.05 mol dm-3 was studied spectrophotometrically. The reaction between permanganate and L-histidine in alkaline medium exhibits 2:1 stoichiometry (KMnO4: L-histidine). The reaction...
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| Format: | Article |
| Language: | English |
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Wiley
2005-01-01
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| Series: | E-Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2005/206147 |
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| author | Timy P. Jose Sharanappa T. Nandibewoor Suresh M. Tuwar |
| author_facet | Timy P. Jose Sharanappa T. Nandibewoor Suresh M. Tuwar |
| author_sort | Timy P. Jose |
| collection | DOAJ |
| description | The kinetics of oxidation of L-histidine by manganese(VII) in aqueous alkaline medium at a constant ionic strength of 0.05 mol dm-3 was studied spectrophotometrically. The reaction between permanganate and L-histidine in alkaline medium exhibits 2:1 stoichiometry (KMnO4: L-histidine). The reaction is of first order in [KMnO4], less than unit order in [L-histidine] and [alkali]. Decrease in the dielectric constant of the medium decreases the rate of reaction. Effect of added products and ionic strength of the reaction medium have been investigated. The main products were identified by spot test and I.R. A mechanism involving the free radical has been proposed. In composite equilibrium step L-histidine binds to MnO4- species to form a complex(C). The reaction constants involved in the different steps of mechanism are evaluated. The activation parameters with respect to slow step of the mechanism are computed and discussed and thermodynamic quantities are also determined. |
| format | Article |
| id | doaj-art-7657519c9bdb401a9aa62de5d76ae894 |
| institution | Kabale University |
| issn | 0973-4945 2090-9810 |
| language | English |
| publishDate | 2005-01-01 |
| publisher | Wiley |
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| series | E-Journal of Chemistry |
| spelling | doaj-art-7657519c9bdb401a9aa62de5d76ae8942025-02-03T05:54:23ZengWileyE-Journal of Chemistry0973-49452090-98102005-01-0121758510.1155/2005/206147Mechanism of Oxidation of L-Histidine by Heptavalent Manganese in Alkaline MediumTimy P. Jose0Sharanappa T. Nandibewoor1Suresh M. Tuwar2Department of Chemistry, Karnatak Science College, Dharwad-580001, IndiaPostgraduate Department of Studies in Chemistry, Karnatak University, Dharwad-580003, IndiaDepartment of Chemistry, Karnatak Science College, Dharwad-580001, IndiaThe kinetics of oxidation of L-histidine by manganese(VII) in aqueous alkaline medium at a constant ionic strength of 0.05 mol dm-3 was studied spectrophotometrically. The reaction between permanganate and L-histidine in alkaline medium exhibits 2:1 stoichiometry (KMnO4: L-histidine). The reaction is of first order in [KMnO4], less than unit order in [L-histidine] and [alkali]. Decrease in the dielectric constant of the medium decreases the rate of reaction. Effect of added products and ionic strength of the reaction medium have been investigated. The main products were identified by spot test and I.R. A mechanism involving the free radical has been proposed. In composite equilibrium step L-histidine binds to MnO4- species to form a complex(C). The reaction constants involved in the different steps of mechanism are evaluated. The activation parameters with respect to slow step of the mechanism are computed and discussed and thermodynamic quantities are also determined.http://dx.doi.org/10.1155/2005/206147 |
| spellingShingle | Timy P. Jose Sharanappa T. Nandibewoor Suresh M. Tuwar Mechanism of Oxidation of L-Histidine by Heptavalent Manganese in Alkaline Medium E-Journal of Chemistry |
| title | Mechanism of Oxidation of L-Histidine by Heptavalent Manganese in Alkaline Medium |
| title_full | Mechanism of Oxidation of L-Histidine by Heptavalent Manganese in Alkaline Medium |
| title_fullStr | Mechanism of Oxidation of L-Histidine by Heptavalent Manganese in Alkaline Medium |
| title_full_unstemmed | Mechanism of Oxidation of L-Histidine by Heptavalent Manganese in Alkaline Medium |
| title_short | Mechanism of Oxidation of L-Histidine by Heptavalent Manganese in Alkaline Medium |
| title_sort | mechanism of oxidation of l histidine by heptavalent manganese in alkaline medium |
| url | http://dx.doi.org/10.1155/2005/206147 |
| work_keys_str_mv | AT timypjose mechanismofoxidationoflhistidinebyheptavalentmanganeseinalkalinemedium AT sharanappatnandibewoor mechanismofoxidationoflhistidinebyheptavalentmanganeseinalkalinemedium AT sureshmtuwar mechanismofoxidationoflhistidinebyheptavalentmanganeseinalkalinemedium |