Determination of cyclodextrins and their derivatives by capillary electrophoresis with indirect UV and conductivity detection

Fresenius J Anal Chem. 2001 Apr;369(7-8):666-9. doi: 10.1007/s002160100721.

Abstract

A fast and simple capillary electrophoretic method suitable for the determination of native alpha-, beta-, gamma-cyclodextrins, their randomly substituted tert-butyl derivatives (average degree of substitution 3.8-4.4), heptakis (2,6-di-O-methyl)- and heptakis (2,3,6-tri-O-methyl)-beta-cyclodextrin was developed. Naphthyl-2-sulfonic acid (2-NSA), 3-iodobenzoic acid (3-IBA) and (1S)-1-phenylethylamine (PHEA) were tested as selective complex forming and UV absorbing background electrolyte additives. The composition of optimized background electrolyte for the separation of uncharged cyclodextrins and their derivatives was: 15 mM 3-iodobenzoic acid titrated with tris[hydroxymethyl]aminomethane to pH 8.0, 5% (v/v) of acetonitrile. A complete resolution of mono-2-O-, mono-3-O- and mono-6-O-carboxymethyl-beta-cyclodextrin regioisomers was achieved in the optimized background electrolyte system: 40 mM PHEA titrated with 2-[N-morpholino]ethanesulfonic acid to pH 5.6. In addition to indirect UV detection a contactless conductometric detector was successfully utilized.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cyclodextrins / analysis*
  • Cyclodextrins / chemistry
  • Electric Conductivity
  • Electrochemistry / methods
  • Electrophoresis, Capillary / methods
  • Indicators and Reagents
  • Spectrophotometry, Ultraviolet / methods

Substances

  • Cyclodextrins
  • Indicators and Reagents