Phosphatidylethanolamine molecular species of fatty acid auxotroph of Escherichia coli grown with elaidate.

Monoacetyldiglycerides derived from the phosphatidylethanolamine molecular species of the fatty acid auxotroph of Escherichia coli grown with elaidate at 37 degrees C were fractionated on thin-layer plates of silica impregnated with silver nitrate and were identified by gas chromatography-mass spectrometry with an OV-17 column and gas chromatography with a Silar-10C column. Phosphatidylethanolamine was made up of the following molecular species: 1-16 : 0-2-16 : 0 (1.2%), 1-14 : 0-2-trans-16 : 1 (1%), 1-16 : 0-2 trans-16 : 1 (3.5%), 1-16 : 0-2-trans-18 : 1 (26.4%), 1-16 : 0-2-cis-16 : 1 (3.8%), 1-trans-18 : 1-2-trans-16 : 1 (13.2%), 1-trans-18 : 1-2-trans-18 : 1 (44.9%), 1-trans-18 : 1-2-cis-16 : 1 (4.5%) and trans-18 : 1-cis-18 : 1 (1.5%).