Unlimited-Volume Electrokinetic Stacking Injection in Sweeping Capillary Electrophoresis Using a Cationic Surfactant
نویسندگان
چکیده
منابع مشابه
Unlimited-volume electrokinetic stacking injection in sweeping capillary electrophoresis using a cationic surfactant.
Sweeping is an effective and convenient way for online sample preconcentration in micellar electrokinetic chromatography. The usual procedure includes a hydrodynamic injection step carried out by applying pressure to the sample vial followed by the subsequent sweeping and separation processes. The injected sample volume is limited by the dimensions of the capillary because a part of the capilla...
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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 are concentrated, the valve is briefl...
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ژورنال
عنوان ژورنال: Analytical Chemistry
سال: 2006
ISSN: 0003-2700,1520-6882
DOI: 10.1021/ac060298x