[Uniform and orthogonal designs on experimental design and optimization of micellar electrokinetic capillary chromatographic method for the simultaneous analysis of three nucleoside antivirus drugs in disinfectant and anti/bacteriostatic products].

To prevent the abuse of nucleoside-based antiviral drugs in disinfectant and anti/bacteriostatic products, a new micellar electrokinetic chromatographic (MEKC) method for the simultaneous determination of three nucleoside antiviral drugs (ganciclovir, acyclovir and penciclovir) was established. Three factors and seven levels uniform design and four factors and four levels orthogonal design were used to optimize the concentration of sodium dodecyl sulfate (SDS), sodium dihydrogen phosphate (NaH2PO4) and sodium borate (Na2B4O7) in the running buffer. The three nucleoside antiviral drugs were separated from each other in the shortest time to obtain effective separation through uniform and orthogonal designs on experimental design and optimization. The separation was performed on an uncoated fused-silica capillary with 50 μ m i. d. and a total length of 30.2 cm (effective length:20 cm). An optimized buffer solution consisting of 25 mmol/L NaH2PO4, 10 mmol/L Na2B4O7 (pH 7.41) and 140 mmol/L dodecyl sulfate sodium was used for separation. The applied voltage was 10 kV, the injected pressure and time was at 0.003 Pa for 4 s. The wavelength of the detection was 250 nm. Under the optimum conditions, the corrected area and the concentration had good linearity. The correlation coefficients (r) were not less than 0.9995. The limits of detection were all 2.0 mg/kg. The limits of quantitation were all 7.0 mg/kg. The relative recoveries ranging from 85.4% to 104.1% with RSDs all lower than 8.0%. It showed that the method was suitable for the detection of ganciclovir, acyclovir and penciclovir in disinfectant and anti/bacteriostat products with simplicity and rapidity.