Add time:07/22/2019         Source:sciencedirect.com

Earlier studies from this laboratory demonstrated that benz[a]anthracene (BA), 7-methylbenz[a]anthracene (7-MBA) and 12-methylbenz[a]anthracene (12-MBA) undergo a bio-alkylation substitution reaction in the mesoanthracenic position(s) or L-region leading to the biosynthesis of the potent carcinogen 7,12-dimethylbenz[a]anthracene (7,12-DMBA). These results support the hypothesis that for most, if not all, unsubstituted polycyclic aromatic hydrocarbon carcinogens, the chemical or biochemical introduction of an alkyl group in the meso-anthracenic position(s) or L-region is a structural requirement for strong carcinogenic activity. Here we report that the L-region methyl derivatives 7-MBA, 12-MBA and 7,12-DMBA are oxidized to hydroxymethyl derivatives by a rat liver cytosol preparation without any apparent oxidation of the ring positions.

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