C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTRAL CONFIRMATION OF DELTA-6-TRANS-18 1 AND DELTA-7-TRANS-18/1 FATTY-ACID METHYL-ESTER POSITIONAL ISOMERS/

Authors
MAZZOLA EP MCMAHON JB MCDONALD RE YURAWECZ MP SEHAT N MOSSOBA MM
Citation
Ep. Mazzola et al., C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTRAL CONFIRMATION OF DELTA-6-TRANS-18 1 AND DELTA-7-TRANS-18/1 FATTY-ACID METHYL-ESTER POSITIONAL ISOMERS/, Journal of the American Oil Chemists' Society, 74(10), 1997, pp. 1335-1337
Citations number
10
Categorie Soggetti
Food Science & Tenology","Chemistry Applied
Journal title
Journal of the American Oil Chemists' Society → ACNP
ISSN journal
0003021X
Volume
74
Issue
10
Year of publication
1997
Pages
1335 - 1337
Database
ISI
SICI code
0003-021X(1997)74:10<1335:CNSCOD>2.0.ZU;2-0
Abstract
Trans octadecenoic acid methyl ester isomers were obtained from a part ially hydrognated soybean oil and isolated by silver-ion high-performa nce liquid chromatography. Recently, the double-bond positions for nin e individual trans octadecenoic acid positional isomers (Delta 8 throu gh Delta 16) were confirmed by gas chromatography-electron ionization mass spectrometry after derivatization to 2-alkenyl-4,4-dimethyloxazol ine. In this communication, the presence of two additional trans-18:1 fatty acid methyl ester positional isomers (Delta 6 and Delta 7) in th e same mixture is confirmed by C-13 nuclear magnetic resonance spectro scopy. The identity of the Delta 5-trans-18:1 far/acid methyl ester po sitional isomer is inferred.