Summary
The CE separation of twelve nucleotides (5′-mono-, di-, triphosphates of adenosine, guanosine, cytidine and uridine) was improved by adding cadmium ion to the ammonium citrate/citric acid buffer (pH 5, ionic strength 100 mM). Cadmium ion acts as a complexing agent for some nucleotides (ATP, CTP, GTP, UTP, GDP). In order to accelerate the separation, the electroosmotic flow was reversed by flushing the fused-silica capillary with 0.2 % aqueous solution of the polycationic surfactant hexadimethrine bromide. A good separation of the twelve nucleotides studied was then achieved on a dynamically coated capillary in less than 5 min by using an ammonium citrate/citric acid buffer (pH 5, ionic strength 100 mM) to which 2 mM cadmium ion has been added. High peak efficiencies were obtained (210 000 theoretical plates) and the resolution between two adjacent peaks was always greater than 1.5.
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Cahours, X., Morin, P. & Dreux, M. Separation of nucleoside mono-, di- and triphosphates by capillary electrophoresis via cadmium complexation. Chromatographia 49, 379–384 (1999). https://doi.org/10.1007/BF02467610
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DOI: https://doi.org/10.1007/BF02467610