title: Rapid liquid chromatographic assay of ciprofloxacin in human aqueous humor.
abstract: A simple, selective and sensitive method has been developed to determine ciprofloxacin in human aqueous humor. Separation of ciprofloxacin was carried out with pipemidic acid as internal standard using a Novapak C18 reversed-phase cartridge column (100 x 8 mm i.d., particle size 4 microns) and a mobile phase consisting of methanol-acetonitrile-citric acid (0.4 M) (3:1:10, v/v/v) at a flow rate of 1 ml min-1. The column effluent was monitored with fluorescence detection at 278 nm (excitation) and 450 nm (emission) after direct injection. The retention times were 4.88 min for pipemidic acid and 7.52 min for ciprofloxacin. The within-day and day-to-day reproducibilities were less than 7% for ciprofloxacin at 0.1 and 1 microgram ml-1 (n = 6). The mean recovery from aqueous humor was found to be 101.37 +/- 6.7% for ciprofloxacin at 0.1 micrograms ml-1 (n = 6 and the detection limit corresponding to a signal-to-noise ratio of 2.5:1 was 250 pg ml-1. The method was shown to be suitable for determining ciprofloxacin levels in human aqueous humor samples.
authors.affiliation: Department of Pharmacology, Hacettepe University, Ankara, Turkey.
authors.forename: N E
authors.initials: NE
authors.lastname: Basci
authors.forename: A
authors.initials: A
authors.lastname: Bozkurt
authors.forename: D
authors.initials: D
authors.lastname: Kalayci
authors.forename: S O
authors.initials: SO
authors.lastname: Kayaalp
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001082:Aqueous Humor / Q000737:chemistry*; D002138:Calibration; D002851:Chromatography, High Pressure Liquid; D002939:Ciprofloxacin / Q000032:analysis*; D006801:Humans; D008875:Middle Aged; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002939:Ciprofloxacin