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Catalytic activity of Manganese(II)‐Gluconate complex in reactions of Hydrogen Peroxide
Author(s) -
Rocha Cleonice,
Da Costa Ferreira Ana Maria
Publication year - 1994
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550261107
Subject(s) - chemistry , hydrogen peroxide , catalysis , formaldehyde , manganese , methanol , ethylene glycol , radical , photochemistry , catalase , peroxide , decomposition , inorganic chemistry , yield (engineering) , oxygen , ligand (biochemistry) , peroxidase , reaction mechanism , organic chemistry , antioxidant , enzyme , biochemistry , materials science , receptor , metallurgy
Kinetic studies of the hydrogen peroxide decomposition catalyzed by the dimeric Mn(II)‐gluconate complex, in alkaline medium, showed evidence for the oxidative cleavage of the ligand, leading to the formation of formaldehyde as one of the products. In the presence of a large excess of other hydroxylated substrates, such as methanol or ethylene glycol, a significant increase in the yield of formaldehyde was observed, corroborating the observed peroxidase activity in this system, in addition to the catalase activity. Oxygen free radicals were detected as intermediates of reaction, by ESR spectroscopy using the spintrapping method, only under aerobic conditions. Therefore, a nonradical mechanism was proposed for the reaction, based on the formation of a peroxo‐Mn(II) complex, and its further reduction to the previous Mn(II) species. © 1994 John Wiley & Sons, Inc.