Analytical and Bioanalytical Chemistry 2015-08-01

Chiral separation of D/L-aldoses by micellar electrokinetic chromatography using a chiral derivatization reagent and a phenylboronic acid complex.

Sachio Yamamoto, Yoko Tamata, Kaori Sejima, Mitsuhiro Kinoshita, Shigeo Suzuki

Index: Anal. Bioanal. Chem 407 , 6201-6, (2015)

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Abstract

A novel method was developed for D/L-isomeric separation of aldopentoses and aldohexoses as their (S)-(+)-4-(N,N-dimethylaminosulfonyl)-7-(3-aminopyrrolidin-1-yl)-2,1,3-benzoxadiazole derivatives using phenylboronate buffer containing sodium dodecyl sulfate as a background electrolyte. The combination of derivatization with a chiral labeling reagent and micellar electrokinetic chromatography with phenylboronate made possible the efficient separation of D/L isomers as well as epimeric isomers of aldopentoses and aldohexoses. Laser-induced fluorescence detection permitted the micromolar-level determination of monosaccharide derivatives. The limit of detection was 105 amol (300 nM), and the repeatabilities of the migration times and peak area responses were 0.8 % and 7.9 % (relative standard deviation; n = 6), respectively. The method was applied to the determination of D/L- galactose in red seaweed.