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Determination of Ephedrine, Pseudo-Ephedrine and Caffeine in a Dietary Product by Capillary Electrophoresis
Uppsala University, Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Medicinal Chemistry. Analytisk Farmaceutisk kemi.
Uppsala University, Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Medicinal Chemistry. Analytisk Farmaceutisk Kemi.
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2006 (English)In: Chromatographia, ISSN 0009-5893, Vol. 63, no 3/4, 143-148 p.Article in journal (Refereed) Published
Abstract [en]

This paper reports the determination of caffeine, ephedrine and pseudo-ephedrine in a dietary product by two rapid and simple methods utilising capillary electrophoresis (CE). The solutes were extracted from the product using 0.2 M HCl and determined by CE with background electrolytes containing 7.5% highly sulfated-β-cyclodextrin (7–11 sulfate groups per β-CD molecule) at pH 2.5 and pH 7.6. Determination of ephedrine and pseudo-ephedrine was accomplished at pH 2.5 with the anode at the detection side of the capillary whereas caffeine was quantified at pH 7.6 with a normal electrophoresis polarity mode. Triethanolamine was added to the running buffer at pH 2.5 in order to reverse the electroosmotic flow (EOF) and thereby speed up the separation of ephedrine and pseudo-ephedrine.

Place, publisher, year, edition, pages
2006. Vol. 63, no 3/4, 143-148 p.
Keyword [en]
Capillary electrophoresis, Sulfated β-cyclodextrin (HS-β-CD) electrolyte, Dietary products, Caffeine, ephedrine and pseudo-ephedrine
Identifiers
URN: urn:nbn:se:uu:diva-75774DOI: doi:10.1365/s10337-006-0726-9OAI: oai:DiVA.org:uu-75774DiVA: diva2:103685
Available from: 2006-02-16 Created: 2006-02-16 Last updated: 2011-01-11

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