| (n-7) and (n-9) cis-Monounsaturated fatty acid contents of 12 Brassica species. | |
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MedLine Citation:
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PMID: 17889912 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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cis-Vaccenic acid or cis-11-octadecenoic acid, a C18:1 (n-7) isomer of oleic acid (C18:1 (n-9)) has been found in several oilseeds. It is synthesized from palmitic acid (C16:0) via production of C16:1 (n-7) by a Delta9 desaturase and elongation by an elongase giving C18:1 (n-7). In this study, the fatty acid composition of 12 Brassica species was analyzed by GC-FID and confirmed by GC-MS. All species contained C18:1 (n-7), C20:1 (n-7) and C22:1 (n-7) fatty acid isomers, suggesting that C18:1 (n-7) was elongated. The levels of these fatty acids varied according to the species. C18:1(n-7)) represented from 0.4% to 3.3% of the total relative fatty acid contents of the seeds. The contents of C20:1(n-7) and C22:1(n-7) levels were lower than C18:1(n-7) contents; the relative fatty acid composition varied from 0.02% to 1.3% and from below the limit of detection to 1.3% for C20:1 (n-7) and C22:1 (n-7), respectively. The ratios of (n-7)/(n-9) ranged from 2.8% to 16.7%, 0.6% to 29.5% and 0% to 2.6% for C18:1, C20:1 and C22:2, respectively. Using statistical similarities or differences of the C18:1 (n-7)/(n-9) ratios for chemotaxonomy, the surveyed species could be arranged into three groups. The first group would include Brassica napus, B. rapa, and B. tournefortii with Eruca sativa branching only related to B. napus. The second group would include B. tournefortii, Raphanus sativus and Sinapis alba. The last group would include B. juncea, B. carinata and B. nigra with no similarity/relationship between them and between the other species. Results suggested that the level of C20:1 (n-7) influenced the levels of all monounsaturated fatty acids with chain length higher than 20 carbons. On the other hand, palmitoleic acid (C16:1) levels, C16:1 being the parent of all (n-7) fatty acids, had no statistically significant correlation with the content of any of the fatty acids of the (n-7) or (n-9) family. |
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Authors:
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Véronique J Barthet |
Publication Detail:
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Type: Journal Article Date: 2007-09-24 |
Journal Detail:
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Title: Phytochemistry Volume: 69 ISSN: 0031-9422 ISO Abbreviation: Phytochemistry Publication Date: 2008 Jan |
Date Detail:
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Created Date: 2008-01-07 Completed Date: 2008-05-07 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0151434 Medline TA: Phytochemistry Country: United States |
Other Details:
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Languages: eng Pagination: 411-7 Citation Subset: IM |
Affiliation:
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Canadian Grain Commission, Grain Research Laboratory, 1404-303 Main Street, Winnipeg, MB, Canada R3C 3G8. vbarthet@grainscanada.gc.ca |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Brassica
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chemistry*,
classification* Chromatography, Gas Fatty Acids, Monounsaturated / analysis*, chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Fatty Acids, Monounsaturated |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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