Abstract
The "Bacterial Reverse Mutation Assay" is generally accepted to analyse the genotoxic capacity of single compounds or complex mixtures such as cigarette-smoke condensates. With an adapted and modified Ames assay, the mutagenicity of native cigarette mainstream whole smoke (WS) and its gas/vapour phase (GVP) was studied. The bacteria were directly exposed to the smoke in a CULTEX1 system closely connected to a smoking robot (VC10). A variety of standard tester strains (TA98, TA100, TA1535, TA1537, TA1538, TA102, WP2uvrApKM101) and descendants of TA98 (YG1021, YG1024, YG1041) and TA100 (YG1026, YG1029 and YG1042) were exposed to whole and filtered smoke of the research cigarette K2R4F to find the most sensitive strains for analysing the mutagenic activity of these test atmospheres. Mutagenicity of WS was detected by TA98, TA100 and their YG descendant strains as well as by WP2uvrApKM101 in the presence of S9 mix. The GVP induced a mutagenic signal in TA100, YG1029 and YG1042 and WP2uvrApKM101 only in the absence of S9 mix. To detect mutagenicity in WS the presence of the plasmid pKM101 is required and a frame-shift mutation is more effective than a missense mutation. To detect mutagenicity in GVP, the presence of the plasmid pKM1...Continue Reading
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