Analysis of flavonoids by capillary zone electrophoresis with electrokinetic supercharging.

@article{Zhong2011AnalysisOF,
  title={Analysis of flavonoids by capillary zone electrophoresis with electrokinetic supercharging.},
  author={Hao Zhong and Qingqiang Yao and Michael C. Breadmore and Yumei Li and Yuanqi Lu},
  journal={The Analyst},
  year={2011},
  volume={136 21},
  pages={
          4486-91
        }
}
On-line concentration via Electrokinetic Supercharging (EKS) was used to enhance the sensitivity of the capillary electrophoretic separation of the four flavonoids naringenin, hesperetin, naringin and hesperidin. Separation conditions, including the background electrolyte pH and concentration, the length and choice of terminator and the electrokinetic injection time were optimized. The optimum conditions were: a background electrolyte of 30 mM sodium tetraborate (pH 9.5) containing 5% (v/v) of… 
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Electrokinetic supercharging (EKS) was utilized in non-aqueous capillary electrophoresis (NACE) to enhance the sensitivity of phenolic acids and was found to be 3.6-7.9 times more sensitive than large-volume sample stacking and anion selective exhaustive injection for the same seven Phenolic acids.
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A method was developed to analyze phenolic acids by nonaqueous CE after online concentration with electrokinetic supercharging and the results showed that the coatings were stable during 40 consecutive injections.
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