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Biological Chemistry

Editor-in-Chief: Brüne, Bernhard

Editorial Board: Buchner, Johannes / Lei, Ming / Ludwig, Stephan / Sies, Helmut / Thomas, Douglas D. / Turk, Boris / Wittinghofer, Alfred


IMPACT FACTOR 2017: 3.022

CiteScore 2017: 2.81

SCImago Journal Rank (SJR) 2017: 1.562
Source Normalized Impact per Paper (SNIP) 2017: 0.705

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ISSN
1437-4315
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Volume 383, Issue 12

Issues

Tyrosinase-Mediated Oxidation of Acetaminophen to 4-Acetamido-o- Benzoquinone

E. Valero / R. Varón / F. García-Carmona
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/BC.2002.217

Abstract

Based on its monophenolic structure and given its pharmacological and toxicological importance, the ability of tyrosinase to oxidize acetaminophen was studied for the first time. Progress curves showed a transient phase characteristic of the monophenolase activity of tyrosinase prior to attaining the steadystate. The duration of this transient phase strongly increased with the drug concentration, which would partly explain why paracetamol oxidation by tyrosinase has not been studied hitherto. The pathway is enhanced by the presence of minute amounts of Ldopa, which shortens the length of the lag period. Acetaminophen oxidation was inhibited by tropolone, a selective inhibitor of tyrosinase. The presence of the corresponding odiphenol as intermediate was demonstrated with ascorbic acid by chemical oxidation using NaIO4 and by HPLC analysis, indicating that acetaminophen is oxidized by the monophenolase activity of tyrosinase to its corresponding oquinone. These results contribute to our knowledge of the oxidation mechanisms of acetaminophen.

About the article

Published Online: 2005-06-01

Published in Print: 2002-12-09


Citation Information: Biological Chemistry, Volume 383, Issue 12, Pages 1931–1939, ISSN (Print) 1431-6730, DOI: https://doi.org/10.1515/BC.2002.217.

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