✦ LIBER ✦

High-resolution 13C-NMR olefinic spectra of DHA and EPA acids, methyl esters and triacylglycerols

✍ Scribed by R. Sacchi; I. Medina; L. Paolillo; F. Addeo

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 574 KB
Volume: 69
Category: Article
ISSN: 0009-3084
DOI: 10.1016/0009-3084(94)90028-0

No coin nor oath required. For personal study only.

✦ Synopsis

The high-resolution 13C-NMR spectra of the olefinic carbons of two major n-3 polyunsaturated fatty acids of fish oils, DHA (22:6, n-3) and EPA (20:5, n-3), were recorded at 100.64 MHz in chloroform-d solutions on standard free acids, methyl esters, Atlantic tuna (Thunnus alalunga) triacylglycerols and methyl esters. All olefinic resonances were resolved in DHA and EPA acids and methyl esters, the number of olefinic signals corresponding to that of unsaturated carbons. The order of the spin-lattice relaxation times (T 0 and the chemical shift differences (A,5) between signal pairs related to the same double bond led to the complete assignment of DHA and EPA olefinic carbons in acids and methyl esters. The DHA and EPA olefinic shifts of Thunnus alalunga triacylglycerois were also studied and compared with those of methyl esters. The possibility of using ]3C-NMR olefinic carbons for the analysis of fish lipids and oils is discussed.

📜 SIMILAR VOLUMES

High-resolution 13C NMR spectra of long-

High-resolution 13C NMR spectra of long-chain acids, methyl esters, glycerol esters, wax esters, nitriles, amides, alcohols and acetates

✍ F.D. Gunstone 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 281 KB

Chemical shifts are reported for long-chain acids, methyl esters, glycerol esters, wax esters, nitriles, amides, alcohols and acetates. These indicate the possibility of using high-resolution ]3C NMR spectroscopy for the analysis of mixtures of these types of compound.

The 13C NMR spectrum of abietic acid and

The 13C NMR spectrum of abietic acid and its methyl ester

✍ William B. Smith 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 English ⚖ 155 KB

## Abstract The assignment of lines in the ^13^C NMR spectrum of abietic acid and its methyl ester have been made using carbon __T__~1~ values and lanthanide induced shift effects. Structure–NMR parameter values are briefly discussed.

High-resolution 1H and 13C NMR of solid

High-resolution 1H and 13C NMR of solid 2-Aminobenzoic acid

✍ Robin K. Harris; Peter Jackson 📂 Article 📅 1987 🏛 Elsevier Science 🌐 English ⚖ 721 KB

High resolution 13C NMR study of synthet

High resolution 13C NMR study of synthetic branched-chain acids and of wool wax acids and isostearic acid

✍ F.D. Gunstone 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 401 KB

IR, 1H NMR and 13C NMR spectra of isomer

IR, 1H NMR and 13C NMR spectra of isomeric 1-aryl-4-methyl-3- and-5-pyrazolecarboxylic esters

✍ Pál Sohár; Ödön Fehér; Endre Tihanyi 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 371 KB

## Abstract The IR, ^1^H and ^13^C NMR spectra of six esters of 1‐aryl‐4‐methyl‐3‐ and 5‐pyrazolecarboxylic acids are reported. On the basis of their spectra the 3‐ or 5‐position of the substituent in such structural isomeric pairs can be established without recourse to the spectrum of the other me

13C-NMR of double and triple bond carbon

13C-NMR of double and triple bond carbon atoms of unsaturated fatty acid methyl esters

✍ Jan Bus; Izaäk Sies; Marcel S.F. Lie Ken Jie 📂 Article 📅 1977 🏛 Elsevier Science 🌐 English ⚖ 562 KB

Fhe carbon magnetic resonance spectra of many fatty acid methyl esters with cis and trans double bonds and triple bonds at various positions and in many different combinations have been investigated. The influence of the ester group on double and triple bonds in the fatty acid chain depends strongl