Carcinogenic glutamic acid pyrolysis products were measured in condensate of cigarette mainstream smoke by HPLC. These carcinogens were found to be present in all brands of filter-tipped cigarette analyzed. The mean levels of 2-amino-6-methyldipyrido[1,2-a:3',2'-d]imidazole and 2-aminodipyridol[1,2-a:3',2'-d]imidazole in the cigarette mainstream smoke were 0.66 and 0.63 ng/cig respectively.
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Kanai et al. (1990) studied this question.