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Capillary zone electrophoresis and micellar electrokinetic chromatography of 4‐aminobenzonitrile carbohydrate derivatives
Author(s) -
Schwaiger Hannes,
Oefner Peter J.,
Huber Christian,
Grill Eduard,
Bonn Günther K.
Publication year - 1994
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.11501501138
Subject(s) - chemistry , micellar electrokinetic chromatography , capillary electrophoresis , chromatography , sodium dodecyl sulfate , uronic acid , aqueous solution , electrophoresis , monosaccharide , maltotriose , maltose , organic chemistry , sucrose , polysaccharide
Aldoses, ketoses and uronic acids were derivatized successfully within 15 min at a temperature of 90°C by reductive amination with 4‐aminobenzonitrile. Subsequently, the derivatives were separated as their borate complexes by capillary zone electrophoresis, using 175 m M borate buffer, pH 10.5, as carrier. The electrophoretic mobilities were determined by the complex stability, which was found to depend on the number of hydroxyl groups on any given carbohydrate derivative, the presence of substituents, and most strongly on the configuration of the vicinal hydroxyl groups at C‐3 and C‐4 in aldoses and uronic acids, and with regard to ketoses on those at C‐4 and C‐5. Time of analysis could be reduced considerably by the use of micellar electrokinetic chromatography, which separated 4‐aminobenzonitrile sugar derivatives on the basis of their differential partitioning into an electroendosmotically driven aqueous phase and into sodium dodecyl sulfate micelles. Optimum resolution was achieved with a Tris‐phosphate buffer, pH 7.5, containing 100 m M of sodium dedecyl sulfate. The method made it possible to resolve several carbohydrates which had not been resolved successfully by means of capillary zone electrophoresis, such as glucose and fructose. Moreover, separation selectivity could be adjusted by varying the capillary temperature. Finally, on‐column UV monitoring at 285 nm allowed the detection of glucose with a lower mass detection limit of 1 fmol and a concentration sensitivity of 0.3 μ M .