Citation:
ZHAO Yan-Yan, LIU Hui-Fang, WANG Li-Juan, HAO Li-Na, GENG Zhao-Hui. Comparison of Sweeping-MEKC and UV Determination of Trace Paraquat in Serum Before & After Hemoperfusion[J]. Chinese Journal of Applied Chemistry,
;2008, 25(9): 1069-1072.
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A micellar electrokinetic chromatography(MEKC) method based on on-line sweeping technique and ultraviolet spectrophotometry(UV) were compared for a fast determination of paraquat concentration in serum.For MEKC,the blood sample pretreatment required only the precipitation of protein contents by 10% trichloroacetic acid.In the running buffer of 50 mmol/L phosphate and 80 mmol/L sodium dodecyl sulfate(SDS)(pH=2.5),the paraquat in the sample was successfully detected within 600 s,in a uncoated fused-silica capillary column(48.5 cm×50 μm,effective length 40 cm) at a voltage of 22 kV,and a injection pressure of 5 kPa,with UV detection at 260 nm.For UV,the sample was deproteinizated by 20% trichlo-racetic acid,50 μL microcell,the determination wavelength was 257 nm.Through the comparative analysis it shows that although ultraviolet spectrophotometry surpassed Sweeping-MEKC in the linear correlation coefficient and the reproduction of quantity,the limit of detection of UV was inferior to that of Sweeping-MEKC.The determitatiom limit of the former is lower,so it is applicable to the determination of the paraquat concentration in serum before and after hemoperfusion.
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