Abstract
The diperiodatocuprate(III) (DPC) oxidation of DL-methionine, a sulfur containing amino acid, was studied spectrophotometrically in alkaline solution. The reaction rate was first order in the concentration of DPC and fractional order in the concentration of DL-methionine. Increasing the OH− concentration decreased the rate of reaction, whereas adding IO −4 enhanced the rate. The reaction was preceded by a small initiation period of about 0.8 minutes. This initiation time decreased when the concentration of IO −4 or DPC increased. Adding the reaction products did not alter the rate of reaction. A mechanism including the intervention of a DL-methionine free radical is proposed and the corresponding rate law is derived. The reaction rate constants are evaluated as well as the activation parameters.
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Sharanabasamma, K., Salunke, M.S. & Tuwar, S.M. Periodate Influencing Diperiodatocuprate(III) Oxidation of Sulfur Containing Amino Acid in Aqueous Alkaline Medium. J Solution Chem 37, 1217–1225 (2008). https://doi.org/10.1007/s10953-008-9307-x
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DOI: https://doi.org/10.1007/s10953-008-9307-x