M. Jie, C. Lam
Oct 22, 1995
Citations
1
Influential Citations
27
Citations
Journal
Chemistry and Physics of Lipids
Abstract
Abstract The 13C-NMR spectroscopic properties of eight triacylglycerols of type AAA containing polyunsaturated fatty acids, viz. 18:2(9Z,12Z) 18:2(9Z,12E), 18:2(9E,12Z) 18:2(9E,12E), 18:2(8E,12Z) 18:3(9Z,12Z,15Z) 20:3(5Z,11Z,14Z) and 20:4(5Z,11Z,14Z,17Z), have been studied. From the carbon shift values of the various carbon atoms, it is possible to confirm the position and geometry of the unsaturated centers in the acyl chains. Many of the similarly positioned carbon atoms from C-1 to C-14, whether arising from methylene or ethylenic carbon nuclei in the α- and β-acyl chains, are resolved to give characteristic pairs of signals. By making use of the differences in shift values for carbon atoms of similarly positioned carbon atoms in the α- and β-acyl chains, the assignment of the chemical shifts of the various nuclei is readily achieved. A further 21 mixed triacylglycerols containing a mixture of saturated (18:0) acetylenic [18:1(5A), 18:1(6A) or 18:1(7A)], mono-ethylenic [18:1(5Z) 18:1(6Z), 18:1(7Z), 18:1(7E) or 18:1(9Z)] and diethylenic [18:2(9Z,12Z)] acyl groups have been studied. The nature (type of unsaturation and position of unsaturated centers) and distribution of the various acyl groups on the glycerol ‘backbone’ of these mixed triacyl glycerols are determined by this technique.