title: Determination of 4'-carbomethoxyphenyl 4-guanidinobenzoate mesylate by HPLC and identification of its related substances by LC-MS-MS.
abstract: 4'-Carbomethoxyphenyl 4-guanidinobenzoate mesylate (4'-CMGB) is a sperm acrosin inhibitor. A validated reversed- phase isocratic high-performance liquid chromatographic (HPLC) method for its assay and related substances detection is described. The chromatographic system consists of a C(8) Shimpack column (150 mm x 4.6 mm, 5 microm) with a mobile phase composition of methanol-0.2% ammonium acetate-triethylamine-glacial acetic acid (470:524:1:5, v/v/v/v) and UV detection at 266 nm. The method shows good chromatographic separation for 4'-CMGB and its related substances. The method is found to be linear in the range of 2.0-100 microg/mL, precise, and sensitive (limit of detection of 15 ng/mL). The major related substances are resolved and identified by HPLC and LC-tandem mass spectrometry as p-guanidino benzoic acid, methyl p-guanidino benzoate, and methyl p-hydroxybenzoate.
authors.affiliation: Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education, Department of Pharmaceutical Analysis, China Pharmaceutical University, 210009 Nanjing, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Yin
authors.forename: Taijun
authors.initials: T
authors.lastname: Hang
authors.forename: Zhengxing
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D001565:Benzoates / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006146:Guanidines / Q000737:chemistry*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D001565:Benzoates; D006146:Guanidines; C058096:4'-carbomethoxyphenyl 4-guanidinobenzoate