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Use of charge transfer interacting additives in electrokinetic chromatography

✍ Scribed by Thomas Welsch; Stephan Kolb; Jörg P. Kutter

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
112 KB
Volume
9
Category
Article
ISSN
1040-7685

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✦ Synopsis

In this paper, a new approach to introduce alternative selectivities to Ž . electrokinetic chromatography EKC using -electron rich anions as separation buffer additives is presented. We describe the results obtained with two dyes, Ž Cardiogreen and a porphyrine-based additive tetraphenyl porphyrine tetrasul-. fonate , for the separation of nitroaromatic and phenolic compounds. Unfortunately, the new additives preclude direct UV-vis detection with traditional working procedures. A strategy to overcome the detection problem making use of a partial filling of the capillary and the application of a counterpressure has been developed. Achievable efficiencies and selectivity changes as compared with SDS have been investigated.

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