Pneumatic Microvalve for Electrokinetic Sample Preconcentration and Capillary Electrophoresis Injection

Abstract

Here we show that a closed pneumatic microvalve on a PDMS chip can serve as a semipermeable membrane under an applied potential, enabling current to pass through while blocking the passage of charged analytes. Enrichment of both anionic and cationic species has been demonstrated, and concentration factors of ~70 have been achieved in just 8 s. Once analytes… (More)

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