Metabolic disposition of a monoterpene ketone, piperitenone, in rats: Evidence for the formation of a known toxin, p-cresol

Madyastha, KM and Gaikwad, NW (1999) Metabolic disposition of a monoterpene ketone, piperitenone, in rats: Evidence for the formation of a known toxin, p-cresol. In: Drug Metabolism and Disposition, 27 (1). pp. 74-80.

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Abstract

It was shown earlier that the monoterpene ketone, piperitenone (I) is one of the major metabolites of R-(+)-pulegone, a potent hepatotoxin, In the present studies, the metabolic disposition of piperitenone (I) was examined in rats. Piperitenone (I) was administered orally (400 mg/kg of the b. wt./day) to rats for 5 days, The following urinary metabolites were isolated and identified by various spectral analyses: p-cresol (VI), 6,7-dehydromenthofuran (III), p-mentha-1,3,5,8-tetraen-3-ol (IX), p-mentha-1,3, 5-friene-3, 8-diol (X), 5-hydroxypiperitenone (VIII), 7-hydroxypiperitenone (XI), 10-hydroxypiperitenone (XII), and 4-hydroxypiperitenone (VII). Incubation of piperitenone (I) with phenobarbital-induced rat liver microsomes in the presence of NADPH resulted in the formation of five metabolites which have been tentatively identified as metabolites III, VII, VIII, XI, XII, on the basis of gas chromatography retention time and gas chromatography-mass spectrometry analysis. Based on these results, a probable mechanism for the formation of p-cresol from piperitenone (I) via the intermediacy of metabolite III has been proposed.

Item Type:	Journal Article
Publication:	Drug Metabolism and Disposition
Publisher:	American Society for Pharmacology and Experimental Therapeutics
Additional Information:	Copyright of this article belongs to American Society for Pharmacology and Experimental Therapeutics.
Department/Centre:	Division of Chemical Sciences > Organic Chemistry
Date Deposited:	30 Jun 2011 11:40
Last Modified:	30 Jun 2011 11:40
URI:	http://eprints.iisc.ac.in/id/eprint/38654

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