344 



IMMUNO-CATALYSIS 



phosphatides. They also reported that a 2.5 per cent solution of oleyl- 

 stearyl-diglyceride, a 2 per cent solution of phosphoryl choline, 0.06 

 per cent solution of glycerophosphoryl choline do not inhibit lecithinase 

 (2.5 per cent concentration). In 0.7 per cent concentration, the 

 related phosphatidyl serine and phosphatidyl ethanolamine are in- 

 hibitory. So also, ox brain cerebrosides, sphingomyelin, and a sorbitol- 

 mannitol oleic acid ester (Tween 30) are inhibitory. Part of the in- 

 hibitory effect of phosphatidyl serine was traced to the removal of 



CH„OCOR 



CH^OCOR 



o- 



CH2O-P-O— CH2CH2NH2 



\ 



o 



a — Phosphatidyl ethanolamine 



CH2OH 



CH2OH 



o- 



/ 

 CHoO— P— O— CHoCHoN+(CH3)3 



^ \ 

 O 



a — Glycerophosphoryl choHne 



CH2OCOR 

 CHOH 



o- 



/ 

 CH2O— P— O— CHoCHoN+(CH3)3 



\ 

 O 



Lysolecithin 



CH2OCOR 

 CH2OCOR 



o- 



COOH 



CH^O-P— O-CHoCH 



\ 



O NH2 



Phosphatidyl serine 



CHoNHCOR 



CHCHCH— CH(CH2)i2CH3 



OH 

 O 



0-P-0-CHoCH2N+CCH3)3 



O 



Sphingomyelin 



CHoNHCOR 



CHCHCH=CH(CH2)i2CH3 



OH 

 O 



H— C(CHOH)3CHCH20H 



I O I 



Cerebroside 



