title: Multiobjective optimization strategy based on desirability functions used for the microemulsion liquid chromatographic separation and quantification of norfloxacin and tinidazole in plasma and formulations.
abstract: The aim of the present study was to optimize a microemulsion liquid chromatography method for the simultaneous determination of norfloxacin and tinidazole binary mixture using a chemometric protocol. Optimization experiments were conducted through a process of screening and optimization. A 2(7-4) fractional factorial design was used as screening design. While the location of optimum conditions was established by applying Derringer's desirability function. The optimal mobile phase composition was predicted to be: 3.5% w/v SDS, 10.03% v/v 1-propanol, 0.5% v/v 1-octanol, and 0.3% triethylamine in 0.02 M phosphoric acid at pH 6.5. The mobile phase was delivered isocratically at a flow rate of 1 mL/min with UV detection at 290 nm. Tinidazole and norfloxacin were eluted with retention times of 1.8 and 5.8 min, respectively. The calibration plots displayed good linear relationships in the concentration ranges of 0.5-50 and 0.75-75 μg/mL for norfloxacin and tinidazole, respectively. The method was successfully applied for determination of both drugs in pharmaceutical dosage forms and real human plasma. Where the accuracy was proved by the low values of % error and high values of recovery, also the relative standard deviation for the results did not exceed 1.5%, proving the precision of the method.
authors.affiliation: Medicinal Chemistry Department, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.
authors.forename: Noura Hemdan
authors.initials: NH
authors.lastname: Abou-Taleb
authors.forename: Dalia Rashad
authors.initials: DR
authors.lastname: El-Wasseef
authors.forename: Dina Tawfik
authors.initials: DT
authors.lastname: El-Sherbiny
authors.forename: Saadia Mohamed
authors.initials: SM
authors.lastname: El-Ashry
mesh_terms: D000900:Anti-Bacterial Agents / Q000097:blood* / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004655:Emulsions / Q000737:chemistry; D006801:Humans; D009643:Norfloxacin / Q000097:blood* / Q000737:chemistry; D010949:Plasma / Q000737:chemistry; D014011:Tinidazole / Q000097:blood* / Q000737:chemistry
chemical_list: D000900:Anti-Bacterial Agents; D004655:Emulsions; D014011:Tinidazole; D009643:Norfloxacin
keywords: Derringer's desirability function; Fractional factorial design; Microemulsion liquid chromatography; Norfloxacin; Tinidazole