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On-line concentration of neutral analytes for micellar electrokinetic chromatography IV. Field-enhanced sample injection
journal contribution
posted on 2023-05-26, 15:51 authored by Joselito Quirino, Terabe, SFundamental conditions for the on-line concentration of neutral analytes by field-enhanced sample injection (FESI) for micellar electrokinetic chromatography (MEKC) is presented. Long water plugs are injected into the capillary to effect an enhanced field during electrokinetic injection of samples at negative polarity. Optimization of the injection procedure is performed by modifying the composition of the micellar sample matrix containing one anionic surfactant. Stacking is found to be dependent on analyte retention factors and the nature of the pseudostationary phase. More than 20- and 100-fold improvements in peak height and peak area were confirmed experimentally. The applicability of the technique was tested using spiked urine samples following a simple liquid‚Äö-liquid extraction step.
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Publication title
Journal of Chromatography AVolume
798Article number
1-2'Number
1-2'Pagination
251-257ISSN
0021-9673Publication status
- Published
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The definitive version is available at http://www.sciencedirect.comRepository Status
- Restricted
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