title: Simultaneous micellar LC determination of lidocaine and tolperisone.
abstract: A micellar liquid chromatography (MLC) procedure was developed for the simultaneous separation and determination of lidocaine hydrochloride (LD HCl) and tolperisone hydrochloride (TP HCl) using a short-column C18 (12.5 mm x 4.6 mm, 5 microm), sodium dodecyl sulfate (SDS) with a small amount of isopropanol, and diode array detector. The optimum conditions for the simultaneous determination of both drugs were 0.075 mol l(-1) SDS-7.5% (v/v) isopropanol with a flow rate of 0.7 ml min(-1) and detection at 210 nm. The LOD (2S/N) of LD HCl was 0.73 ng 20 microl(-1), whereas that of TP HCl was 1.43 ng 20 microl(-1). The calibration curves for LD HCl and TP HCl were linear over the ranges 0.125-500 microg ml(-1) (r(2)=0.9999) and 1.00-500 microg ml(-1) (r(2)=0.9997), respectively. The %recoveries of both drugs were in the range 98-103% and the %RSD values were less than 2. The proposed method has been successfully applied to the simultaneous determination of TP HCl and LD HCl in various pharmaceutical preparations.
authors.affiliation: Faculty of Science, Department of Chemistry, Chiang Mai University, 50200, Chiang Mai, Thailand.
authors.forename: Napaporn
authors.initials: N
authors.lastname: Youngvises
authors.forename: Boonsom
authors.initials: B
authors.lastname: Liawruangrath
authors.forename: Saisunee
authors.initials: S
authors.lastname: Liawruangrath
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods*; D008012:Lidocaine / Q000032:analysis*; D014049:Tolperisone / Q000032:analysis*
chemical_list: D008012:Lidocaine; D014049:Tolperisone