title: Acute toxicity and mutagenesis of three metabolites mixture of nitrobenzene in mice.
abstract: Nitrobenzene is a synthetic compound, more than 95% of which is used in the production of aniline. Nitrobenzene has been demonstrated to be substantially metabolized to p-Nitrophenol, p-Aminophenol and p-Nitroaniline in food animals (e.g., bovines, fowls). There have been no studies on the acute toxicity and the mutagenesis of the mixture of the three metabolites mentioned above. The aim of the present study is to testify the acute toxicity and the mutagenesis of the three metabolites mixture. Seventy Kunming mice (half male, half female) received an intragastric administration exposure to metabolites-containing suspension of 750, 638, 542, 461, 392, 333 mg kg(-1) body weight and 0.5% sodium carboxymethyl cellulose (control), followed by a 14-day observation. The medial lethal dose (LD(50)) concentration for nitrobenzene metabolites mixture in this study was 499.92 mg/kg. Their mutagenic toxicology was studied through micronucleus and sperm abnormality test. Kunming mice were twice intragastrically exposed to 1/5 LD(50), 1/10 LD(50), 1/20 LD(50) mg kg(-1) nitrobenzene metabolites-containing suspension spaced 24-h apart. Cyclophosphamide, pure water and sodium carboxymethyl cellulose served as doses of the positive group, the negative group and the solvent control group, respectively. The incidence of micronucleus and sperm abnormality increased significantly in the 1/5 LD(50) and 1/10 LD(50) group compared with the negative and solvent control group. A dose-related increase in the incidence of micronucleus and sperm abnormality was noted. In conclusion, the three metabolites mixture of nitrobenzene was secondary toxicity and mutagenic substances in mice.
authors.affiliation: Colleges of Veterinary Medicine, Northeast Agriculture University, Heilongjiang, China.
authors.forename: Guixia
authors.initials: G
authors.lastname: Wang
authors.forename: Xiuying
authors.initials: X
authors.lastname: Zhang
authors.forename: Chunzhu
authors.initials: C
authors.lastname: Yao
authors.forename: Meizhan
authors.initials: M
authors.lastname: Tian
mesh_terms: D000627:Aminophenols / Q000633:toxicity*; D000814:Aniline Compounds / Q000633:toxicity*; D000818:Animals; D001835:Body Weight; D001854:Bone Marrow Cells / Q000473:pathology; D005260:Female; D007928:Lethal Dose 50; D008297:Male; D051379:Mice; D015162:Micronucleus Tests; D016296:Mutagenesis; D009153:Mutagens / Q000633:toxicity; D009578:Nitrobenzenes / Q000633:toxicity*; D009596:Nitrophenols / Q000633:toxicity*; D013094:Spermatozoa / Q000002:abnormalities / Q000187:drug effects; D023382:Toxicity Tests, Acute
chemical_list: D000627:Aminophenols; D000814:Aniline Compounds; D009153:Mutagens; D009578:Nitrobenzenes; D009596:Nitrophenols; C008625:nitroaniline; C036077:nitrobenzene; C026729:4-aminophenol; C024836:4-nitrophenol