using reverse-phase high-performance liquid chromatography ( rp-hplc ) on 5-micron ods ( c18 ; mobile phase , k2hpo4 buffer , ph 7.0-7.8 ) , up to 10 pteridines ( pterin-6-carboxylic acid , xanthopterin , neopterin , monapterin , isoxanthopterin , lumazine , biopterin , 6-hydroxymethylpterin , pterin ) could be separated in the extracts of blood samples and determined fluorometrically ( femtomolar range ) .
C0068527
neopterin
C0005562
biopterin