Kinetics and Mechanism of Pyrogallol Autoxidation

Abstract

Abstract: The kinetics of pyrogallol autooxidation has been studied by single-sweeposcillopolarography in Tris-HCIbuffer soluton in the PHrange 7. 20-9. 10. The reaction wasfirst order to pyrogallol in the presence of excess dissolved O₂. The focus was put onpyrogallol autooxidation with products of semiquinone free radical and active oxygen. Amechanism was presented which explains the increase in rate with increasing PHby postulating thatH₂PYR-has a greater reactivity with dissolved O₂ than H₃PYR. The derived rate law is ingood agreement with the experimental observations. The paper also presented a new assayfor superoxlde dismutase and antioxidant activity of pharmaceuticals.

Key words: Pyrogallol autooxidation, Single-sweep oscillopolarography, Computer simulation, Kinetics

CLC Number:

O643

TrendMD:

YUAN Zhuo-Bin, GAO Ruo-Mei. Kinetics and Mechanism of Pyrogallol Autoxidation[J]. Chem. J. Chinese Universities, 1997, 18(9): 1438.

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Kinetics and Mechanism of Pyrogallol Autoxidation

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