title: Mutagenicity of nitrite-treated soy sauce in Chinese hamster V79 cells.
abstract: Mutagenicity of 4 kinds of Japanese soy sauce and tyramine, which is a precursor of a mutagen (3-diazotyramine) and present in soy sauce, after nitrite treatment under a yellow lamp was studied in Chinese hamster V79 cells with 6-thioguanine (TG) as a selective marker. The frequencies of mutation caused by nitrite-treated samples of soy sauce increased in the V79 cells in a dose-dependent manner. Four kinds of nitrite-treated soy sauce induced 139 to 473 TG-resistant mutants per 10(5) clonable cells per milliliter of soy sauce equivalent in the cells. Nitrite-treated tyramine was also mutagenic for the cells; it induced 8.6, 13.3, and 18.3 TG-resistant mutants per 10(5) clonable cells at concentrations of 20 micrograms, 56 micrograms, and 112 micrograms, respectively.
authors: Department of Microbiology, Kochi Medical School, Japan.
authors: S
authors: S
authors: Kimura
authors: K
authors: K
authors: Okazaki
authors: M
authors: M
authors: Higashimoto
authors: Y
authors: Y
authors: Ohnishi
mesh_terms: D000818:Animals; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D005421:Flavoring Agents / Q000494:pharmacology*; D009152:Mutagenicity Tests; D009153:Mutagens; D009573:Nitrites; D013025:Glycine max; D014439:Tyramine / Q000494:pharmacology
chemical_list: D005421:Flavoring Agents; D009153:Mutagens; D009573:Nitrites; D014439:Tyramine