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- W1978744897 abstract "Chiral separations of fluorescein isothiocyanate-labeled amines have been performed in poly(vinyl alcohol) (PVA)-coated microfluidic glass chips. Baseline separation of enantiomers could be realized in coated devices while they could not be resolved in uncoated chips. The electroosmotic flow (EOF) in PVA-coated channels is suppressed over a wide pH range which leads to a considerable improved reproducibility of migration times in repetitive analysis. Due to the high resolution obtained in such devices, it was possible to reliable determine the enantiomeric purity with high accuracy. One percent of the minor enantiomer could be determined in the presence of large excess of the other enantiomer. As the EOF was suppressed, the anionic compounds were detected at the anode whereas the dominant EOF in uncoated devices resulted in an effective mobility to the cathode. Applying PVA-coated channels considerable improved precision of migration times was found. The relative standard deviation of migration times was below 1% in PVA-coated devices. Accordingly, excessive rinsing or etching steps in order to stabilize the EOF could be omitted while this was necessary for a reliable operation of uncoated devices." @default.
- W1978744897 created "2016-06-24" @default.
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- W1978744897 date "2003-07-31" @default.
- W1978744897 modified "2023-10-17" @default.
- W1978744897 title "Coated microfluidic devices for improved chiral separations in microchip electrophoresis" @default.
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- W1978744897 doi "https://doi.org/10.1002/elps.200305498" @default.
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