Fig. (5) HPLC analysis of aliquots of OHCP incubated in rat serum (pH7, 37°C) for 10 min (A) or 90 min (B). Proteinprecipitation and reaction of the aldehydes with 2,4 dinitrophenylhydrazine. 1: 2,4 dinitrophenylhydrazine, 2,3,4: dinitrophenylhydrazones of hydroxypropanal (2), aldophosphamide (3) and acrolein (4). Arrows indicate start of HPLC run.