Abstract
Complex biological samples require very high resolution separation strategies. The platform introduced here capitalises on the hyphenation of liquid chromatographic (LC) and electric potential gradient electrochromatographic multi-dimensional separation genres. First-dimension selectivity is provided by simultaneous size exclusion (SEC) and strong cation exchange (SCX) chromatography modes, while the second dimension comprises reversed phase (RP) characteristics in a dynamic (time-variant) electric field. The time-variant potential gradient with reversal of polarity is applied across the second dimension monolithic capillary throughout the duration of the solvent strength gradient elution. Hence, the platform offers comprehensive on-line sample clean-up (matrix depletion, analyte enrichment), fractionation (first dimention LC), and separation (second dimension LC) with the prospect of altering selectivity via polarity reversal dynamic electric field tuning.
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