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Objective To establish a rapid method for detecting acetylbritannilactone(ABL)by online sweeping-micellar electrokinetic chromatography(MEKC)and to elevate the sensitivity of the detection.Methods The combination of online sweeping technique with MEKC was used to determine the content of ABL in the extract of Inula britannica in plasma of rats.Results ABL was completely separated within 15 min in running buffer and sample buffer.The optimal conditions were as follows:on uncoated fused quartz silica capillary,with separation voltage of 23 kV,capillary temperature of 25 oC,and detection wavelength of 195 nm.The regression equations revealed good linear relationships between the peak area and concentration of ABL(r=0.998),with the detection limits of 0.005–0.15 mg/mL.The relative standard deviations of migration time and peak areas for intra-and inter-batch were<2.45%and<2.26%,respectively.The recovery rate of this method was 96.3%–97.2%.Conclusion This method provides some advantages in separation speed,testing sensitivity,and operating convenience,with low sample and reagent consumption.The online sweeping-MEKC is an effective method for pharmacokinetic study and analysis on tracing biological samples.
Objective To establish a rapid method for detecting acetylbritannilactone (ABL) by online sweeping-micellar electrokinetic chromatography (MEKC) and to elevate the sensitivity of the detection. Methods The combination of online sweeping technique with MEKC was used to determine the content of ABL in the extract of Inula britannica in plasma of rats. Results ABL was completely separated within 15 min in running buffer and sample buffer. Optimal conditions were as follows: on uncoated fused quartz silica capillary, with separation voltage of 23 kV, capillary temperature of 25 oC , and detection wavelength of 195 nm. The regression equations revealed good linear relationships between the peak area and concentration of ABL (r = 0.998) with the detection limits of 0.005-0.15 mg / mL. The relative standard deviations of migration time and peak areas for intra-and inter-batch were <2.45% and <2.26%, respectively. The recovery rate of this method was 96.3% -97.2% .Conclusion This method provides some advantages in separation speed, testing sensitivity, and operating convenience, with low sample and reagent consumption. online sweeping-MEKC is an effective method for pharmacokinetic study and analysis on tracing biological samples.