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Fluorescence characterization of acid-base interaction and mobility at Chromatographic interfaces

✍ Scribed by S. Uhl; K. Rempfer; H.-J. Egelhaaf; B. Lehr; D. Oelkrug

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
551 KB
Volume
303
Category
Article
ISSN
0003-2670

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✦ Synopsis

Chromatographic surfaces are investigated by means of fluorescent probes (aza-aromatic compounds and anthroic acids). From absorption and fluorescence spectra the acid-base equilibria and types of binding at the interfaces are determined. The different surface acidities are given in terms of pH equivalents, which cover a range of more than three ApH units. The rotational mobility of probe molecules on reversed phase materials is measured to get a more detailed understanding of the chromatographic separation mechanism. The rotational correlation time is calculated from fluorescence anisotropy and decay time measurements.

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