Liquid chromatography determination of the anti-androgen vinclozolin and its metabolites in rat serum.
The objective of this study was to develop a chromatographic method for the analysis of the anti-androgen vinclozolin (V) and its metabolites 2-[[(3,5-dichlorophenyl)-carbamoyl]oxy]-2-methyl-3-butenoic acid (M1), 3',5'-dichloro-2-hydroxy-2-methylbut-3-enanilide (M2) and 3,5-dichloroaniline (M3) in rat serum. V, M1-M3 were resolved using an HPLC gradient program with a mobile phase consisting of 60-75% methanol:acetonitrile (70:30) and 0.05 M monobasic sodium phosphate buffer pH 3.3 at 1 ml/min, a C18 column, and monitored at 212 nm. Incubates of 0.01 M monobasic potassium phosphate buffer (PB) pH 7.4 and rat serum were spiked with V and its metabolites and processed by diluting samples (1:4) with 0.1M PB pH 3.3, to limit methodological hydrolysis of analytes, followed by addition of acetonitrile. Recoveries of V, M1 and M2 ranged from 85 to 105%, whereas recovery of M3 was <25%. V was hydrolyzed to M1 and M2 after incubation in PB pH 7.4 and rat serum, with M1 the predominant metabolite. This method was successfully applied in the analysis of V and its metabolites in the serum of a male rat after oral administration of V (100 mg/kg).
Experimental Toxicology Division, National Health and Environmental Effects Research Laboratory, Office of Research and Development, US Environmental Protection Agency, MD B143-01, Research Triangle Park, NC 27711, USA.
Adolfo
A
Sierra-Santoyo
Hugh A
HA
Barton
Michael F
MF
Hughes
D000726:Androgen Antagonists / Q000097:blood*; D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D008297:Male; D010080:Oxazoles / Q000097:blood*; D051381:Rats; D020318:Rats, Long-Evans
D000726:Androgen Antagonists; D010080:Oxazoles; C025643:vinclozolin