Phospholipase D from cabbage or Streptomyces chromofuscus catalyses th
e transesterification of alkylphosphate esters, which are potent antit
umor agents. The exchange of choline in octadecylphosphosphocholine by
N-(2-hydroxyethyl)-N-methylpiperidine with phospholipase D from cabba
ge is kinetically controlled and amounts to maximum 60% in buffer, 43%
in buffer/n-hexane, and 82% in buffer/n-hexane/1-octanol.