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Acute oral toxicity of selected flavor chemicals.

The acute oral lethal doses are reported in rats or mice for 63 substances which are used in flavorings. For specific groups of compounds which contain several representatives of one structural class, some effects of structure on acute oral toxicity were observed. For pyrazines, the addition and position of methyl groups affected the toxicity while the substitution of ethyl for methyl had little effect. Toxicity increased with the proximity of the methyl group. The thiazoles and thiazolines tested had similar toxicities regardless of the side groups. The furan thioesters tested were about equally toxic, a fact which would be consistent with hydrolysis to the acid plus thiol.