Add time:07/18/2019         Source:sciencedirect.com

The mutagenicity of benzo[a]pyrene (BP) and a number of methylated derivatives towards Salmonella typhimurium has been tested. The most mutagenic derivative tested was 6-methylbenzo[a]pyrene which produced about twice the number of revertants as did BP. 11-Methylbenzo[a]pyrene was slightly more mutagenic than BP. All the other compounds tested (7-, 8-, 9- and 10-methylbenzo[a]pyrene and 7,8- and 7,10-dimethylbenzo[a]pyrene) were significantly less active than benzo[a]pyrene. With the exception of 6-emthylbenzo[a]pyrene, these results closely parallel the known carcinogenicity of the methylated benzo[a]pyrenes, and support the view that metabolic activation of BP may involve the 7–10 positions which are blocked in the methylated compounds.

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