Summary
A method for chiral determination of aspartic (asp) and glutamic acid (glu) with a unique separation selectivity was developed. Asp and glu were derivatised using a fluorogenic reagent,o-phthaldialdehyde/2,3,4,6-tetra-O-acetyl-1-thio-β-D-glucopyranose (OPA/TATG). In addition to TATG, the utility of a number of other chiral thiols, N-acetyl-L-cysteine (AC), N-isobutyryl-L-cysteine (IBC) and Boc-L-cysteine (BocC), were also investigated. Various background electrolytes were examined including pure aqueous and non-aqueous as well as micellar separation media. The best results were obtained with OPA/TATG-labelled amino acids in micellar electrokinetic chromatography (MEKC) by using a neutral surfactant, octylglucoside (OG). With OG in the background electrolyte (BGE), the D- and L-asp and glu derivatives could be resolved outside the micellar retention window (MRW) creating a high selectivity towards other amino acids. This was due to the higher electrophoretic mobility of these diacid derivatives. The monoacid derivatives were all clustered within the minimised MRW. The selective method was applied to complex samples containing protein and physiological amino acids such as various food products and human body fluids. The detectability using both UV and laser-induced fluorescence detection (He−Cd 325 nm) was evaluated.
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Tivesten, A., Lundqvist, A. & Folestad, S. Selective chiral determination of aspartic and glutamic acid in biological samples by capillary electrophoresis. Chromatographia 44, 623–633 (1997). https://doi.org/10.1007/BF02466666
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DOI: https://doi.org/10.1007/BF02466666