REGIOSPECIFIC STUDY OF VEGETABLE OIL TRIA CYLGLYCEROLS BY CHEMICAL CLEAVAGE AND HIGH-RESOLUTION NMR C-13

The C-13 NMR study of triacylglycerols allows the determination of the positional distribution of fatty acids on the glycerol backbone. Tria cylglycerols of three oils were studied : Pinus koraiensis oil charact erized by the presence of fatty acids with a first double bond in posi tion 5, Brassica juncea oil containing a high level of erucic acid, Tu ng oil of which conjugated polyethylenic fatty acids are in the majori ty. The comparison with the results obtained by C-13 NMR and those obt ained by the action of a Grignard product on triacylglycerols allowed us to validate this spectroscopic method.