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E-Journal of Chemistry
Volume 6 (2009), Issue 1, Pages 93-98

Kinetics and Mechanism of Oxidation of L-Cystine by Hexacyanoferrate(III) in Alkaline Medium

Annapurna Nowduri, Kalyan Kumar Adari, Nageswara Rao Gollapalli, and Vani Parvataneni

Department of Inorganic and Analytical Chemistry, School of Chemistry, Andhra University, Visakhapatnam-530 003, India

Received 20 March 2008; Accepted 10 May 2008

Copyright © 2009 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Kinetics of oxidation of L-cystine by hexacyanoferrate(III) was studied in alkaline medium at 30 °C. The reaction was followed spectrophotometrically at λmax = 420 nm. The reaction was found to be first order dependence each on [HCF(III)] and [cystine]. It was found that the rate of the reaction increases with increase in [OH-]. The oxidation product of the reaction was found to be cysteic acid. A plausible mechanism has been proposed to account for the experimental results.