Abstract
Fundamental 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–liquid extraction step.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
