Rapid determination of aspartate enantiomers in tissue samples by microdialysis coupled on-line with capillary electrophoresis

Jonathan E. Thompson, Thomas W. Vickroy, Robert T. Kennedy

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

Microdialysis was coupled on-line with derivatization by o-phthalaldehyde and β-mercaptoethanol and optically gated capillaiy electrophoresis to determine D- and L- aspartate in tissue samples obtained from rats. The microdialysis probe was inserted into a homogenized tissue sample which allowed generation of a continuous sample stream that was filtered and deproteinated. With 7.5 mM β-cyclodextrin (CD) in the electrophoresis buffer, the enantiomers of interest could be resolved in 3 s with an electric field of 2500 V/cm over a separation length of 15 mm. Values of D- and L-aspartate in different tissues agreed well with those obtained by an HPLC procedure that required protein precipitation, centrifugation, and extraction. The speed and compatibility with automation of the microdialysis/CE method may make it a general approach for a variety of applications involving high-throughput analysis or sensorlike operation.

Original languageEnglish
Pages (from-to)2379-2384
Number of pages6
JournalAnalytical Chemistry
Volume71
Issue number13
DOIs
StatePublished - 1999

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