title: Electrochemical adsorptive behavior of some fluoroquinolones at carbon paste electrode.
abstract: Cyclic voltammetry and differential pulse voltammetry were used to explore the adsorption behavior of three antibacterial agents at a carbon paste electrode. The drugs were accumulated on a carbon paste electrode, and a well-defined oxidation peak was obtained in acetate buffer (pH 5.0). The adsorptive stripping response was evaluated as a function of some variables such as the scan rate, pH and accumulation time. A simple, precise, inexpensive and sensitive voltammetric method has been developed for the determination of the cited drugs (Lomefloxacin (LFX), Sparfloxacin hydrochloride (SFX), and Gatifloxacin (GFX)). A linear calibration was obtained from 2 x 10(-7) M to 4 x 10(-5) M for LFX, 2 x 10(-7) M to 6 x 10(-5) M for SFX, and GFX. The limits of detection (LOD) were 4.2 x 10(-7), 7 x 10(-7) and 6.6 x 10(-7) M, while the limits of quantification (LOQ) were 1.4 x 10(-6), 2.3 x 10(-6) and 2.2 x 10(-6) M for LFX, SFX, and GFX, respectively. The R. S. D. of five measurements at the 1 x 10(-6) M level were 0.4, 0.5 and 0.3 for LFX, SFX and GFX, respectively. The method was applied to the determination of LFX, SFX and GFX in dilute urine samples and dosage forms, and compared with the HPLC method.
authors.affiliation: National Organization for Drug Control and Research, Egypt. mohamedelries@hotmail.com
authors.forename: M A
authors.initials: MA
authors.lastname: El Ries
authors.forename: A A
authors.initials: AA
authors.lastname: Wassel
authors.forename: N T
authors.initials: NT
authors.lastname: Abdel Ghani
authors.forename: M A
authors.initials: MA
authors.lastname: El-Shall
mesh_terms: D000327:Adsorption; D000890:Anti-Infective Agents / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004563:Electrochemistry; D004566:Electrodes; D024841:Fluoroquinolones / Q000737:chemistry* / Q000652:urine; D000077734:Gatifloxacin; D015363:Quinolones / Q000737:chemistry / Q000652:urine
chemical_list: D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D015363:Quinolones; D002244:Carbon; D000077734:Gatifloxacin; C053091:lomefloxacin; C061363:sparfloxacin