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Bioassay-guided fractionation of an H2O extract of the root of Scutellaria baicalensis has furnished an in vitro antigenotoxic flavonoid, baicalein (1) and 2',5,5',7-tetrahydroxy-6',8-dimethoxyflavone (2). Compound 1 exhibited a dose-dependent inhibition of aflatoxin B1 (AFB1) and N-methyl-N'-nitro-N-nitrosoguanidine mutagenicity in the Salmonella typhimurium bacterial mutation assay. In the chromosome aberration assay, compound 1, at a concentration of 5 microM, reduced the frequency of chromosome aberration induced by AFB1 but increased the clastogenic effect of AFB1 at a concentration of 50 microM.
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Lee et al. (2009) studied this question.
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