title: Direct clean-up and analysis of ribonucleosides in physiological fluids.
abstract: We describe the group-selective separation and quantification of unmodified, modified and hypermodified ribonucleosides in physiological fluids (urine, serum) by on-line multidimensional high-performance affinity chromatography (HPAC)-reversed-phase liquid chromatography (RPLC). The excretion levels and patterns of ribonucleosides such as N1-methyladenosine, N1-methylinosine, N2-methylguanosine, N2-dimethylguanosine, N6-carbamoylthreonyladenosine and 2-pyridone-5-carboxamido-N-ribofuranoside were determined in urines from a control group and from patients with different diseases. The HPAC-RPLC method applied represents a powerful tool, e.g. as a non-invasive screening test, a method to investigate disorders in ribonucleoside and/or RNA metabolism, a method for drug monitoring during nucleoside chemotherapy, and a method to study renal ribonucleoside reutilization.
mesh_terms: D000293:Adolescent; D000328:Adult; D001826:Body Fluids / Q000032:analysis; D002648:Child; D002675:Child, Preschool; D003404:Creatinine / Q000097:blood; D005260:Female; D006801:Humans; D008297:Male; D012263:Ribonucleosides / Q000032:analysis* / Q000097:blood / Q000652:urine
chemical_list: D012263:Ribonucleosides; D003404:Creatinine