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A method is presented for the separation and quantitative determination of compounds normally related to purine and pyrimidine metabolism in biological material. The retention behaviour of nucleobases, ribonucleosides, deoxyribonucleosides and cyclic ribonucleotides has been systematically investigated by reversed-phase high-performance liquid chromatography using a non-linear gradient. Ultimately a separation of the purine and pyrimidine compounds was achieved in a 35-min run with an average detection limit of 5-10 pmol per injection. Recoveries of standards added to urine, plasma or serum were 96 +/- 5%.
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