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(n-7) and (n-9) cis-Monounsaturated fatty acid contents of 12 Brassica species.
Phytochemistry. 2008 Jan; 69(2):411-7.P

Abstract

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.

Authors+Show Affiliations

Canadian Grain Commission, Grain Research Laboratory, 1404-303 Main Street, Winnipeg, MB, Canada R3C 3G8. vbarthet@grainscanada.gc.ca

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17889912

Citation

Barthet, Véronique J.. "(n-7) and (n-9) cis-Monounsaturated Fatty Acid Contents of 12 Brassica Species." Phytochemistry, vol. 69, no. 2, 2008, pp. 411-7.
Barthet VJ. (n-7) and (n-9) cis-Monounsaturated fatty acid contents of 12 Brassica species. Phytochemistry. 2008;69(2):411-7.
Barthet, V. J. (2008). (n-7) and (n-9) cis-Monounsaturated fatty acid contents of 12 Brassica species. Phytochemistry, 69(2), 411-7.
Barthet VJ. (n-7) and (n-9) cis-Monounsaturated Fatty Acid Contents of 12 Brassica Species. Phytochemistry. 2008;69(2):411-7. PubMed PMID: 17889912.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - (n-7) and (n-9) cis-Monounsaturated fatty acid contents of 12 Brassica species. A1 - Barthet,Véronique J, Y1 - 2007/09/24/ PY - 2007/01/30/received PY - 2007/06/27/revised PY - 2007/08/08/accepted PY - 2007/9/25/pubmed PY - 2008/5/8/medline PY - 2007/9/25/entrez SP - 411 EP - 7 JF - Phytochemistry JO - Phytochemistry VL - 69 IS - 2 N2 - 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. SN - 0031-9422 UR - https://www.unboundmedicine.com/medline/citation/17889912/_n_7__and__n_9__cis_Monounsaturated_fatty_acid_contents_of_12_Brassica_species_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0031-9422(07)00523-7 DB - PRIME DP - Unbound Medicine ER -
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