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GC Separation of cis-Eicosenoic Acid Positional Isomers on an Ionic Liquid SLB-IL100 Stationary Phase

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Title: GC Separation of cis-Eicosenoic Acid Positional Isomers on an Ionic Liquid SLB-IL100 Stationary Phase
Authors: Ando, Yasuhiro Browse this author →KAKEN DB
Sasaki, Tsubasa Browse this author
Keywords: GC
Eicosenoic acid
Ionic liquid
Fatty acid
Fish oil
Flathead flounder
Methyl ester
Issue Date: Jun-2011
Publisher: Springer
Journal Title: Journal of the American Oil Chemists' Society
Volume: 88
Issue: 6
Start Page: 743
End Page: 748
Publisher DOI: 10.1007/s11746-010-1733-4
Abstract: Gas chromatography (GC) of cis-eicosenoic acid (20:1) positional isomers has been investigated on a capillary column of ionic liquid 1,9-di(3-vinyl-imidazolium)nonane bis(trifluoromethyl)sulfonylimidate stationary phase (SLB-IL100). A test mixture of isomeric 20:1 methyl esters was prepared from flathead flounder flesh lipids. On a 60-m column operated at 150-180 °C, six peaks appeared in the elution order of 20:ln-15 → 20:ln-13 → 20:ln-11 → 20:ln-9 → 20:ln-7 → 20:ln-5. These peaks were baseline resolved within 20 min at 180 °C. The 20:ln-13 and 20:ln-11 isomers, poorly resolved on conventional polar polysiloxane stationary phases, were completely separated from each other with separation factor α = 1.02 and peak resolution (Rs) >- 1.57. When equivalent chain length (ECL) values were compared between the SLB-IL100 and CP-Sil 88 (biscyanopropyl polysiloxane), those of 20:ln-15 and 20:ln-13 exceptionally tended to be lower on the SLB-IL100. The excellent separation of 20:1 isomers seems due to less retention of 20:ln-15 and 20:ln-13 on SLB-IL100 rather than simply due to its high polarity. Analysis of herring oil 20:1 revealed the occurrence of 20:ln-13 in the Pacific herring but not in the Atlantic herring. The ionic liquid stationary phase, SLB-IL100, is effective for analyzing 20:1 isomers occurring in fish and other natural oils.
Rights: The original publication is available at
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 安藤 靖浩

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