title: Simultaneous determination of ofloxacin, tetrahydrozoline hydrochloride, and prednisolone acetate by high-performance liquid chromatography.
abstract: A simple, specific, and precise high-performance liquid chromatographic method has been developed for the simultaneous determination of ofloxacin (OFX), tetrahydrozoline hydrochloride (THC), and prednisolone acetate (PAC) in ophthalmic suspension using propylparaben (POP) as the internal standard. The mobile phase consists of 0.05 M phosphate buffer-acetonitrile (65:35, v/v), and the pH is adjusted to 2.7 with orthophosphoric acid. A column containing octadecyl silane chemically bonded to porous silica particles (Waters Spherisorb, 5 microm ODS 1, 4.6 x 150 mm) is used as the stationary phase. The detection is carried out using a variable wavelength UV-vis detector set at 210 nm for OFX and THC and 254 nm for POP (internal standard) and PAC. The solutions are chromatographed at a constant flow rate of 1.2 mL/min. Retention times for OFX, THC, POP, and PAC are approximately 2.5, 4.5, 7.8, and 9.5 min, respectively. The relative retention times are approximately 0.14 min for OFX, 0.35 min for THC, 1.00 min for POP, and 1.22 min for PAC. The linearity range and percent recoveries for OFX, THC, and PAC are 24-120, 4-16, and 16-80 microg/mL and 100.48%, 100.34%, and 100.21%, respectively.
authors.affiliation: Jamjoom Pharmaceuticals, Jeddah, Kingdom of Saudi Arabia.
authors.forename: Mohammed Shahid
authors.initials: MS
authors.lastname: Ali
authors.forename: Mohsin
authors.initials: M
authors.lastname: Ghori
authors.forename: Anwar
authors.initials: A
authors.lastname: Saeed
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D007093:Imidazoles / Q000032:analysis*; D015242:Ofloxacin / Q000032:analysis*; D011239:Prednisolone / Q000031:analogs & derivatives* / Q000032:analysis*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D007093:Imidazoles; C009935:prednisolone acetate; D011239:Prednisolone; D015242:Ofloxacin; C005810:tetrahydrozoline