[Selective characterisation of N1-methyladenosine and N7-methylguanosine in urine (author's transl)].

We describe the selective analysis of N-methylated ribonucleosides, i.e., N1-methyl adenosine (m1Ado) and N7-methyl guanosine (m7Guo) in the presence of other nucleosides in urine. m1Ado as well as m7Guo were characterized by use of chromatographic techniques including substance specific chemical reactions.