378 BACTERIOLOGICAL CHEMISTRY 



a common constituent of many moulds, having been found 

 in P. javanicum, P. puheridum,, P. aurantio-brunneum, 

 A.fischeri, A. oryzce, A. sydowi, A. niger and Rhizopus 

 jajyonicus in amounts varying from 0-1 to 0-4 per cent, 

 of the dry weight of the mycehum. It has been found 

 as ergosteryl palmitate in P. brevi-co7npactum, P. italicurn 

 and P. atirantio-griseum in amounts between 0-02 and 

 0-5 per cent, of the dry mycelium. 



The mycelium of Aspergillus sydowi contains fungus 



C1BH31.CHOH.CH.CHOH.CH2.CH2.OH 



cerebrin, I , m.p. 



NH.CO.CHOH.C24H49 



143°C., [ajo + 11*9° (in pyridine), which is identical 

 with that found in yeasts and in mushrooms. 



Phosphatides. — The phosphatides yield fatty acids, 

 glycerol or carbohydrates, phosphoric acid and choline or 

 other nitrogenous bases on hydrolysis. According to the 

 ratio of nitrogen to phosphorus in the molecule, they are 

 classified as monoamino-monophosphatides (1:1), dia- 

 mino-monophosphatides (2:1) and mono amino -diphospha- 

 tides (1:2). The phosphatides are soluble in ether and are 

 precipitated from such solution by acetone, by which 

 means they can be separated from the fats which are 

 soluble in acetone. The commonest phosphatide is 

 lecithin, having a nitrogen to phosphorus ratio of 1:1. 

 It is very probably built up of glycerol esterified with one 

 molecule each of stearic, oleic and phosphoric acids with 

 a molecule of choline linked on to the phosphoric acid 

 group, as represented in the formula : — 



CH2O.CO.C17H36 (stearic acid) 

 CHO.CO.C17H33 (oleic acid) 



CH20.P.(OH).O.C2H, 



II I 



O N(CH3)3 (chulinc) 



I 

 OH 



