title: Analysis of flunarizine in the presence of some of its degradation products using micellar liquid chromatography (MLC) or microemulsion liquid chromatography (MELC)--application to dosage forms.
abstract: The separation of flunarizine hydrochloride (FLZ) and five of its degradation products--1-[bis(4-fluorophenyl)methyl]-4-(3-phenyl-2-propenyl)piperazine, 4-oxide (A), bis(4-fluorophenyl)methanone (B), bis(4-fluorophenyl)methanol (C), 1-(3-phenyl-2-propenyl)piperazine(D), and 1-[bis-4-fluorophenyl) methyl] piperazine (E)--could be accomplished by reversed phase liquid chromatography using either micellar or microemulsion mobile phases. Cyanopropyl-bonded stationary phase has been used with UV detection at 254 nm. Microemulsion mobile phase consisting of 0.15 M SDS, 10% n-propanol, 1% n-octanol, and 0.3% triethylamine in 0.02 M phosphoric acid of pH 7.0, has been used for the separation of FLZ and its degradation products (B, C, D, and E). Micellar mobile phases consisting of 0.15 M sodium dodecyl sulphate (SDS), 10% n-propanol, 0.3% triethylamine (TEA) in 0.02 M phosphoric acid of pH values either 4.0 or 6.8 have been used for the separation of FLZ from its degradation products, i.e. either from (B, C, D, and E) or from (A, B, C, and D), respectively. Micellar liquid chromatography (MLC) was applied to the determination of FLZ in pure form as well as in dosage forms; the calibration graph was linear over the concentration range of 0.15-50 microg/mL with detection limit of 0.02 microg/mL (4.19 x 10(-8)M).
authors.affiliation: Department of Medical Chemistry, Faculty of Pharmacy, University of Mansoura, Mansoura, Egypt. dina_elsherbiny@mans.edu.eg
authors.forename: Dina T
authors.initials: DT
authors.lastname: El-Sherbiny
authors.forename: Manal I
authors.initials: MI
authors.lastname: Eid
authors.forename: Dalia R
authors.initials: DR
authors.lastname: El-Wasseef
authors.forename: Riyad M
authors.initials: RM
authors.lastname: Al-Ashan
authors.forename: Fathalla
authors.initials: F
authors.lastname: Belal
mesh_terms: D020003:1-Octanol / Q000032:analysis; D000433:1-Propanol / Q000032:analysis; D000927:Anticonvulsants / Q000032:analysis; D002138:Calibration; D002853:Chromatography, Liquid / Q000295:instrumentation / Q000379:methods*; D005021:Ethylamines / Q000032:analysis; D005444:Flunarizine / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D008823:Micelles; D008956:Models, Chemical; D010756:Phosphoric Acids / Q000032:analysis; D012967:Sodium Dodecyl Sulfate / Q000032:analysis; D013997:Time Factors
chemical_list: D000927:Anticonvulsants; D005021:Ethylamines; D008823:Micelles; D010756:Phosphoric Acids; D012967:Sodium Dodecyl Sulfate; D000433:1-Propanol; C030242:phosphoric acid; D020003:1-Octanol; D005444:Flunarizine; C016162:triethylamine