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- W2078280145 abstract "At present, the main limitation for the further adoption of capillary electrochromatography (CEC) in the (routine) laboratory is caused by the lack of reproducible and stable columns. The main source of column instability is concentrated in the frits needed to retain the packed bed inside the CEC capillary. The sintering process used to prepare the frits can be rather problematic and irreproducible, particularly for small stationary phase particles and wide column diameters. Since the (surface) composition of the frits is different from the bulk stationary phase packing, different electroosmotic flow (EOF) velocities are generated. This effect is assumed to be primarily responsible for rapid column destruction. In this contribution, a novel approach for the preparation of fritless CEC capillaries is presented and evaluated. Using 5 microm Hypersil ODS particles, separation efficiencies in the range of 130,000-200,000 plates/m were obtained. In a 100 microm inner diameter packed column, electrical currents up to 50 microA could be tolerated without negative effects such as bubble formation. The prepared CEC columns were found to be stable and could easily be operated continuously for several days without column damage. An additional advantage of the proposed tapering approach is that application of pressure on the in- and outlet vial during separation was not required to prevent bubble formation." @default.
- W2078280145 created "2016-06-24" @default.
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- W2078280145 date "2002-05-01" @default.
- W2078280145 modified "2023-10-03" @default.
- W2078280145 title "Novel approach for fritless capillary electrochromatography" @default.
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- W2078280145 doi "https://doi.org/10.1002/1522-2683(200205)23:9<1224::aid-elps1224>3.0.co;2-s" @default.
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