An experimental design approach to selecting the optimum LC conditions for the determination of local anaesthetics

Dincel A., Basci N. E.

CHROMATOGRAPHIA, cilt.66, 2007 (SCI İndekslerine Giren Dergi) identifier identifier


A sensitive high performance liquid chromatographic (HPLC) method has been developed and validated for the simultaneous determination of four local anaesthetics: liclocaine, proparacaine, bupivacaine and oxybuprocaine. A full factorial design was used. The chromatographic separation was achieved using a Bondesil C-8 (4.6 x 2.5 mm i.d., particle size 5 mu m) analytical column. An optimised mobile phase consisted of acetonitrile and sodium clihydrogen phosphate (pH = 3.0, 20 mM) (30:70, v/v) at a flow rate of 1.2 mL min(-1). Local anaesthetics detection was performed by UV-Vis detector at 220 nm. The retention times for liclocaine, proporacaine, bupivacaine and oxybuprocaine were 5.74, 9.28, 16.84 and 26.26 min, respectively. HPLCUV-Vis method was linear in the range of 50-5,000 ng mL(-1) for liclocaine and proparacaine and 100-5,000 ng mL(-1) for bupivacaine and oxybuprocaine. The limit of detection (LOD) was 25 ng mL(-1) for liclocaine, proparacaine and 30 ng mL(-1) for bupivacaine and oxybuprocaine. The limit of quantification (LOQ) was found to be 50 ng mL(-1) for liclocaine, proparacaine and 100 ng mL(-1) for bupivacaine, oxybuprocaine. In intra-day and inter-day precision and accuracy analysis, the relative standard deviation was found to be less than 8%.