title: Identification of rat urinary and fecal metabolites of a new herbicide, pyribenzoxim.
abstract: Rats were treated with pyribenzoxim (O-[2,6-bis[(4,6-dimethoxy-2-pyrimidinyl)oxy]benzoyl]oxime), a new herbicide, to investigate the related metabolites in urine and feces. Metabolites were identified using LC/MS (electrospray ionization) and GC/MS (electron impact ionization) following the relatively simple and rapid extraction and purification procedures. Three metabolites were identified in urine either from oral gavage or intravenous (iv) injection. They were benzophenone oxime (BO), benzophenone oxime glucuronide (BOG), and 2-hydroxy-6-(4,6-dimethoxypyrimidin-2-yloxy)benzoic acid (HDB). Benzophenone oxime was present in larger quantity than BOG and HDB in urine from oral treatment, while the case was opposite in urine from iv treatment. Glucuronide conjugate was confirmed unambiguously by enzyme hydrolysis. 2,6-Bis(4,6-dimethoxypyrimidin-2-yloxy)benzoic acid (KIH-2023) and benzophenone were identified in feces. Benzophenone was confirmed by GC/MS and HPLC/DAD since LC/MS could not produce an ESI spectrum. On the basis of the results obtained, a metabolic map of pyribenzoxim is proposed.
authors.affiliation: Department of Pharmacology and PharmacoGenomics Research Center, Inje University College of Medicine, Busan 614-735, School of Agricultural Biotechnology, Sillimdong, Kwanakgu, Seoul 151-742, Korea.
authors.forename: Kwang-Hyeon
authors.initials: KH
authors.lastname: Liu
authors.forename: Joon-Kwan
authors.initials: JK
authors.lastname: Moon
authors.forename: Seung-Hun
authors.initials: SH
authors.lastname: Kang
authors.forename: Sukjin
authors.initials: S
authors.lastname: Koo
authors.forename: Hye-Suk
authors.initials: HS
authors.lastname: Lee
authors.forename: Jeong-Han
authors.initials: JH
authors.lastname: Kim
mesh_terms: D000818:Animals; D001577:Benzophenones / Q000032:analysis* / Q000493:pharmacokinetics / Q000652:urine*; D002853:Chromatography, Liquid; D005243:Feces / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006540:Herbicides / Q000032:analysis* / Q000652:urine*; D006868:Hydrolysis; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D001577:Benzophenones; D006540:Herbicides; C454324:benzophenone O-(2,6-bis(4,6-dimethoxypyrimidin-2-yloxy)benzoyl)oxime