Characterization of electrophoretic behavior of sugar isomers by microchip electrophoresis coupled with videomicroscopy

Fuquan Dang, Lihua Zhang, Mohammad Jabasini, Noritada Kaji, Yoshinobu Baba

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

The electrophoretic behavior of oligosaccharide isomers was investigated by microchip electrophoresis (μ-CE) coupled with videomicroscopy using maltose, cellobiose, maltriose, and panose as oligosaccharide isomer models. The present study revealed for the first time that the formation of a carbohydrate - phosphate complex is a pH-independent rapid process, whereas the formation of a carbohydrate - borate complex is a highly pH-dependent slow process. As a result, phosphate buffer gave much better separation on oligosaccharide isomers than borate and borate-Tris buffers over a wide pH range μ-CE. The imaging analysis of the complete process of sample loading and injection with field-amplified stacking (FAS) demonstrated that FAS could be used as an efficient method for manipulating the shape of injected sample plugs, and thus improving the performance of μ-CE in the absence of electroosmotic flow. However, once the ionic strength mismatch between sample and running buffer reached a critical threshold, a further increase in ionic strength mismatch deteriorated the effect of FAS, resulting in a surprising decrease in separation efficiency and peak distortion. Under optimal conditions, high-resolution separation of some oligosaccharide isomers and a complex oligosaccharide mixture released from ribonuclease B was achieved using PMMA microchips with an effective separation channel of 30 mm.

Original languageEnglish
Pages (from-to)2433-2439
Number of pages7
JournalAnalytical chemistry
Volume75
Issue number10
DOIs
Publication statusPublished - May 15 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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