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Identification of the Unsaturated Heptadecyl Fatty Acids in the Seed Oils of Thespesia populnea and Gossypium hirsutum
Author(s) -
Dowd Michael K.
Publication year - 2012
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-012-2071-5
Subject(s) - fatty acid , chemistry , polyunsaturated fatty acid , gas chromatography–mass spectrometry , gas chromatography , organic chemistry , cottonseed , derivatization , food science , botany , biology , mass spectrometry , chromatography , high performance liquid chromatography
The fatty acid composition of the seed oils of Thespesia populnea and cotton variety SG‐747 ( Gossypium hirsutum ) were studied to identity their 17‐carbon fatty acids. With a combination of chemical derivatization, gas chromatography, and mass spectrometry, 8‐heptadecenoic acid, 9‐heptadecenoic acid, and 8,11‐heptadecadienoic acids were identified in both oils. Additionally, traces of 10‐heptadecenoic acid were identified in the T. populnea oil. Although these odd‐carbon number fatty acids are present in only minor amounts in cottonseed oil, they make up about ~2 % of the fatty acids in T. populnea seed oil. The identification of these acids indicates that fatty acid α‐oxidation is not restricted to cyclopropene fatty acids in these plants, but also occurs with unsaturated fatty acids. Combined with malvalic acid (generally accepted as being formed by α‐oxidation of sterculic acid), ~7 % of the fatty acids in T. populnea seed have under gone α‐oxidization. The results should help clarify the composition of T. populnea seed oil, which has been reported inconsistently in the literature.