Abstract
Mutagenic activity of a commercial ammonia caramel colouring was demonstrated in Salmonella typhimurium TA100 without metabolic activation. The activity in strain TA100 was increased using a 10-min pre-incubation, and a clear dose-response relationship was seen using this method. Investigation of samples taken from the different stages in the industrial process showed a constant level of mutagenic activity in samples from the middle to the end of the heating process with a steep increase in the sample taken after the end of heating. No mutagenic activity was seen in assays with S. typhimurium strains TA1535 and TA98
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