a method is presented for the separation of 6-thiopurine bases and ribonucleosides , of sulphate anions and of common purine bases and oxidized purines by means of high-pressure liquid cation-exchange chromatography using a 0.18 x 100 cm column , filled with beckman m71 resin , and eluted with 0.4m ammonium formate , ph 4.6 , at a linear flow velocity of 5.2 cm/min at 50 degrees c .
C0038720
sulphate
C0003075
anions