Formation of 2-nitro-3-methylimidazo[4,5-f]quinoline, a directly mutagenic product, by near-ultraviolet irradiation of a mixture of 2-amino-3-methylimidazo[4,5-f]quinoline and N-nitrosodimethylamine |
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Authors: | Sakae Arimoto and Hikoya Hayatsu |
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Institution: | Faculty of Pharmaceutical Sciences, Okayama University, Tsushima, Okayama 700, Japan |
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Abstract: | Direct-acting mutagens to Salmonella typhimurium TA98 were found to be formed from heterocyclic amines on exposure to near-ultraviolet light in the presence of N-nitrosodialkylamines. We have isolated the mutagenic photoproduct formed from 2-amino-3-methylimidazo4,5-f]quinoline (IQ) and N-nitrosodimethylamine, and the product was identified as 3-methyl-2-nitromidazo4,5-f]quinoline (IQ(NO2)). The yield of IQ(NO2) from IQ was estimated to be 17%. Similar light-dependent activation of IQ was noted with 4 different nitrosodialkylamines other than nitrosodimethylamine. Furthermore, MeIQ and MeIQx were also activated with nitrosamine and light. These reactions represent an example of interaction between 2 different classes of mutagens. |
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Keywords: | IQ N-Nitrosodimethylamine Heterocyclic amines Nitrosamines Near-ultraviolet light |
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