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Tyrosinase-Mediated Oxidation of Acetaminophen to 4-Acetamido-o- Benzoquinone
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E. Valero
Published/Copyright:
June 1, 2005
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.
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Published Online: 2005-06-01
Published in Print: 2002-12-09
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
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- The Receptor-Bound N-Terminal Ectodomain of the Amyloid Precursor Protein Is Associated with Membrane Rafts
- Evaluation of Similarities in the cis/trans Isomerase Function of Trigger Factor and DnaK
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