The distribution of Δ5 polyene acids in some pine seed oils between the α- and β-chains by 13C-NMR spectroscopy

✍ Scribed by Frank D Gunstone; Shirley Seth; Robert L Wolff

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 459 KB
• Volume: 78
• Category: Article
• ISSN: 0009-3084
• DOI: 10.1016/0009-3084(95)02488-5

✦ Synopsis

Seven Pinus seed oils, previously examined by gas chromatography (Ref. [3]), have been re-examined by I~C-NMR spectroscopy. The spectra clearly indicate the presence of A5 acids (mainly a C1~ A5,9,12 isomer) and almost all the signals have been assigned on the basis of relevant data already in the literature for A5 esters. Using the intensities of appropriate signals it was possible to estimate the level of total A5 acids from signals associated with the C~, C 2, and glycerol carbon atoms and the level of n-6 acids from the ~12 and ~13 signals. The results were in accord with those previously obtained by gas chromatography. The A5 acids were apparent only among the :~-chains. Taxus haccata seed oil is shown to contain 5,9-18:2, but A5 acids in Cflamaecyparis hm'soniana seed oil were too low to be identified by NMR spectroscopy.