13C-NMR studies of polyunsaturated triacylglycerols of type AAA and mixed triacylglycerols containing saturated, acetylenic and ethylenic acyl groups
✍ Scribed by Marcel S.F Lie Ken Jie; C.C Lam
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 856 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0009-3084
No coin nor oath required. For personal study only.
✦ Synopsis
The ~-~C-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(SE,12Z) 18:3(9Z,12Z,15Z) 20:3(5Z, I IZ,14Z) and 20:4(5Z, I1Z,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 :~-and fl-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 c~-and fl-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)