Separation of adenosine and its three nucleotides. Experimental conditions: sample, adenosine, AMP, AMP, ADP and ATP, each 0.5 mg in 0.5 mL upper phase; solvent system, ethanol–50% saturated aqueous ammonium sulfate (1:2, v/v) (System 20, Table V); flow rate, 0.5 mL/min; revolution, 750 rpm; retention of stationary phase, 60%.