Firozbabu, K. and Sivasubramanian, R. and Noel, M. and Anbukulandainathan, M. (2011) A homogeneous redox catalytic process for the paired synthesis of l-cysteine and l-cysteic acid from l-cystine. Electrochimica Acta, 56 (27). pp. 9797-9801. ISSN 0013-4686

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Abstract

Redox catalytic process involved in the paired electrosynthesis of l-cysteine and l-cysteic acid from l-cystine is investigated by cyclic voltammetric technique and also confirmed by preparative electrolysis. The cyclic voltammetric behaviour shows that in the catholyte, in situ deposited tin (Sn) surface acts as a redox catalyst for the electro-reduction of l-cystine to l-cysteine whereas in the anolyte, the electro-generated bromine acts as a homogeneous redox mediator to enhance the electro-oxidation of l-cystine. l-Cysteine hydrochloride monohydrate (l-cysteine) and l-cysteic acid are prepared from lcystine by preparative electrolysis with high purity and high yield using graphite cathode and DSA anode. At optimum concentration of l-cystine with 1:1 concentration ratio (catholyte:anolyte), the material yield obtained for l-cysteine is above 80% and that for l-cysteic acid is close to 60% in the paired electrosynthesis process in the batch operation. Scope for further experiments in conversion efficiency is also discussed

Item Type:	Article
Uncontrolled Keywords:	l-Cystine; l-Cysteine hydrochloride monohydrate; l-Cysteic acid; Cyclic voltammetry; Paired electrolysis; Redox catalyst
Subjects:	Electroorganic
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	19 Nov 2012 11:53
Last Modified:	19 Nov 2012 11:53
URI:	http://cecri.csircentral.net/id/eprint/2889

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