Haemin-catalyzed oxidation of ascorbic acid by H2O2 evidence for a second haemin-H2O2 complex

M. L. Kremer

doi:10.1039/TF9676301208

Haemin-catalyzed oxidation of ascorbic acid by H₂O₂ evidence for a second haemin-H₂O₂ complex

M. L. Kremer^*

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

A study of the haemin-catalyzed oxidation of ascorbic acid by H ₂O₂ shows that two intermediate complexes between haemin and H₂O₂ are formed in two consecutive steps. The second complex can react either with H₂O₂ to give oxygen or with ascorbic acid to give dehydroascorbic acid. The respective rate constants are k₄ = (4.5±0.4)x 10₂ M_-1 min_-1 and k₃ = (5±2)x 10₃ M_-1 min _-1 at 0.0°C and pH = 7.21. The mechanism is similar to that of the Fe³⁺+H₂O₂ reaction.

Original language	English
Pages (from-to)	1208-1214
Number of pages	7
Journal	Transactions of the Faraday Society
Volume	63
DOIs	https://doi.org/10.1039/TF9676301208
State	Published - 1967

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title = "Haemin-catalyzed oxidation of ascorbic acid by H2O2 evidence for a second haemin-H2O2 complex",

abstract = "A study of the haemin-catalyzed oxidation of ascorbic acid by H 2O2 shows that two intermediate complexes between haemin and H2O2 are formed in two consecutive steps. The second complex can react either with H2O2 to give oxygen or with ascorbic acid to give dehydroascorbic acid. The respective rate constants are k4 = (4.5±0.4)x 102 M-1 min-1 and k3 = (5±2)x 103 M-1 min -1 at 0.0°C and pH = 7.21. The mechanism is similar to that of the Fe3++H2O2 reaction.",

author = "Kremer, {M. L.}",

year = "1967",

doi = "10.1039/TF9676301208",

language = "אנגלית",

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AU - Kremer, M. L.

PY - 1967

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N2 - A study of the haemin-catalyzed oxidation of ascorbic acid by H 2O2 shows that two intermediate complexes between haemin and H2O2 are formed in two consecutive steps. The second complex can react either with H2O2 to give oxygen or with ascorbic acid to give dehydroascorbic acid. The respective rate constants are k4 = (4.5±0.4)x 102 M-1 min-1 and k3 = (5±2)x 103 M-1 min -1 at 0.0°C and pH = 7.21. The mechanism is similar to that of the Fe3++H2O2 reaction.

AB - A study of the haemin-catalyzed oxidation of ascorbic acid by H 2O2 shows that two intermediate complexes between haemin and H2O2 are formed in two consecutive steps. The second complex can react either with H2O2 to give oxygen or with ascorbic acid to give dehydroascorbic acid. The respective rate constants are k4 = (4.5±0.4)x 102 M-1 min-1 and k3 = (5±2)x 103 M-1 min -1 at 0.0°C and pH = 7.21. The mechanism is similar to that of the Fe3++H2O2 reaction.

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Haemin-catalyzed oxidation of ascorbic acid by H₂O₂ evidence for a second haemin-H₂O₂ complex

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