New metabolites of the naturally-occurring mutagen, quercetin, the pro-mutagen, rutin and of taxifolin.

The major biliary metabolites of the mutagen, quercetin, the pro-mutagen rutin and taxifolin have been identified by EI-mass spectrometry, UV-spectroscopy and chromatographic methods as conjugates of the corresponding 3′-O-methyl ethers. The toxicological significance of these findings is discussed.