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Kinetic and Mechanistic Studies on the Oxidation of DL-Aspartic Acid with Gold(III) in Aqueous and Micellar media

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Abstract

Kinetics of oxidation of DL-aspartic acid was studied at 30°C with Au(III) in sodium acetate–acetic acid buffer medium to investigate the mechanism of oxidation the presence and absence of nonionic micelle, Triton X-100. The rate of the reaction is fractional with respect to Asp and ionic strength has negligible effect. The rate of the reaction is inhibited by [Cl] and [AuIII]. The reaction is accelerated initially by increase in pH and then showed a retardation over the value of 3.90, displaying that the rate depends on [H+]. This reaction is inhibited in the presence of Triton X-100. A mechanism involving zwitterionic species of aspartic acid and AuCl3OH of oxidant has been proposed.

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ACKNOWLEDGMENTS

One of the authors, Rama Rajeswari Makena, thanks UGC SERO, India for minor research project (no. F MRP-4551/14 (SERO/UGC), dated 17 March 2014), and Andhra University, Visakhapatnam, India for providing the research facilities.

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Correspondence to R. R. Makena.

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Makena, R.R., Rallabandi, R. & Parvataneni, V. Kinetic and Mechanistic Studies on the Oxidation of DL-Aspartic Acid with Gold(III) in Aqueous and Micellar media. Russ. J. Phys. Chem. B 13, 915–922 (2019). https://doi.org/10.1134/S1990793119060241

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Keywords:

  • DL-aspartic acid
  • Au(III)
  • Triton X-100
  • kinetics
  • oxidation