Nonionic Micellar Catalyzed Oxidation of Vitamins by Chloramine-T in HClO4 Medium: A Kinetic Study |
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Authors: | Varuna Shukla Neelu Kambo |
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Affiliation: | Department of Chemistry , H.B. Technological Institute , Kanpur, India |
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Abstract: | The kinetics of oxidation of vitamin B1 (thiamine hydrochloride) and vitamin B6 (pyridoxine hydrochloride) by chloramine-T (CAT) in perchloric acid medium and in presence of a non ionic surfactant (Triton x-100) have been investigated. A catalytic effect of the nonionic micelle on the rate of oxidation has been observed and rate is found to be proportional to 7lcub;k′ + k″ [Triton x-100]}, where k′ and k″ are the rate constants in absence and presence of surfactant, respectively. The rate shows a first-order, a fractional order and a zero order dependence on [Chloramine-T]o, [Vitamin]o and [H+]0, respectively in absence as well as in presence of surfactant. A mechanism involving association/binding between the oxidant and the surfactant micelle, which is supported by spectrophotometric evidence has been proposed. The binding parameters have also been evaluated using a pseudo-phase kinetic model. |
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Keywords: | Chloramine-T oxidation kinetics micellar catalysis oxidations of vitamins |
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