title: Studies on trimethylsilyl derivatives of 1-alk-1enyl-2-acyl glycerols by gas-liquid chromatography mass spectrometry.
abstract: Trimethylsilyl derivatives of 1-hexadec-1-enyl-2-decanoyl and -2-octadecenoylglycerols and 1-octadec-1-enyl-2-decanoyl and -2-octadecenoylglycerols were subjected to analysis by a gas chromatograph mass spectrometer system. The characteristic ions are as follows: (1) ions at [M-15]+ and [M-90]+- are observed, 2 or 16 mass units less than those of the corresponding 1-alkyl-2-acyl or 1,2-diacyl derivatives; (2) the base peak is m/e 129; (3) the ion at [M-R1CH=CHO]+ or [R2COO+130]+ is present in high abundance; (4) ions at m/e 311 and 339, characteristic of trimethylsilyl derivatives of 1-hexadec-1-enyl and 1-octadec-1-enylglycerols, are due to [R1CH-CHO-1)+73]+, also confirmed from studies on the perdeuteriotrimethylsilyl derivatives; (5) several ions based on one acyl group, [R2CO]+, [R2CO+74]+ and [R2COO+74]+ are also observed.
mesh_terms: D000215:Acylation; D002849:Chromatography, Gas; D004075:Diglycerides / Q000032:analysis*; D005989:Glycerides / Q000032:analysis*; D006868:Hydrolysis; D013058:Mass Spectrometry; D008722:Methods; D010740:Phospholipases; D010955:Plasmalogens / Q000032:analysis; D014297:Trimethylsilyl Compounds / Q000032:analysis
chemical_list: D004075:Diglycerides; D005989:Glycerides; D010955:Plasmalogens; D014297:Trimethylsilyl Compounds; D010740:Phospholipases