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Čabala, Radomír ; Frank, Hartmut:
Polypyrrole-coated capillaries for capillary zone electrophoresis.
In: Journal of Chromatography A.
Bd. 1079
(2005)
Heft 1-2
.
- S. 344-348.
ISSN 0021-9673
DOI: https://doi.org/10.1016/j.chroma.2005.03.039
Abstract
Fused-silica capillaries are permanently coated by silanization with 3-{[3- (N-pyrrole)-2-hydroxypropyl]amino}propyltriethoxysilane followed by oxidative polymerization of the pyrrole moieties with iron (III) or peroxodisulfate in the presence of chloride, perchlorate, or dextransulfate as anions. This approach allows to modulate the EOF in its magnitude as well as in its direction. With the small anions chloride and perchlorate, the EOF is reversed below pH 5 while with the large dextransulfate polyanions (DS) the EOF is relatively constant over the pH range from 2.5 to 9.4. This can be of advantage at low pH, at which the EOF of uncoated capillaries is close to zero. Application for separation of some herbicides is shown. The lifetime of PP-modified capillaries is satisfactory: the decrease in EOF is less than 3% during 80 analyses (160 min) and less than 5% over three months of storage. The reproducibility of capillary modification is about 5% (RSD of EOF). (c) 2005 Elsevier B.V. All rights reserved.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER33958 |
| Institutionen der Universität: | Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 13 Aug 2015 06:12 |
| Letzte Änderung: | 13 Aug 2015 06:12 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/17991 |