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A method for the analysis of ribonucleotides using capillary electrophoresis has been developed. A cross-linked polyacrylamide coated column, Tris-HCl, and phosphate-mixed buffer were used, which produced reproducible separations (solute migration time average RSD% of 1.2) of 14 ribonucleotides within 50 min. Linear relationships between peak areas and sample concentrations, an average minimum detectable concentration of 5.4 μ
m, and an average minimum detectable quantity of 0.08 pmol were obtained. The described method allowed reproducible and reliable qualitative and quantitative analysis of intracellular ribonucleotide pools in HeLa cells.