| Characterization of rapeseed (Brassica napus) oils by bulk C, O, H, and fatty acid C stable isotope analyses. | |
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MedLine Citation:
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PMID: 20536244 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Rapeseed ( Brassica napus ) oils differing in cultivar, sites of growth, and harvest year were characterized by fatty acid concentrations and carbon, hydrogen, and oxygen stable isotope analyses of bulk oils (delta(13)C(bulk), delta(2)H(bulk), delta(18)O(bulk) values) and individual fatty acids (delta(13)C(FA)). The delta(13)C(bulk), delta(2)H(bulk), and delta(18)O(bulk) values were determined by continuous flow combustion and high-temperature conversion elemental analyzer-isotope ratio mass spectrometry (EA/IRMS, TC-EA/IRMS). The delta(13)C(FA) values were determined using gas chromatography--combustion-isotope ratio mass spectrometry (GC/C/IRMS). For comparison, other C(3) vegetable oils rich in linolenic acid (flax and false flax oils) and rich in linoleic acid (poppy, sunflower, and safflower oils) were submitted to the same chemical and isotopic analyses. The bulk and molecular delta(13)C values were typical for C(3) plants. The delta(13)C value of palmitic acid (delta(13)C(16:0)) and n-3 alpha-linolenic acid (delta(13)C(18:3n-3)) differed (p < 0.001) between rape, flax, and poppy oils. Also within species, significant differences of delta(13)C(FA) were observed (p < 0.01). The hydrogen and oxygen isotope compositions of rape oil differed between cultivars (p < 0.05). Major differences in the individual delta(13)C(FA) values were found. A plant-specific carbon isotope fractionation occurs during the biosynthesis of the fatty acids and particularly during desaturation of C(18) acids in rape and flax. Bulk oil and specific fatty acid stable isotope analysis might be useful in tracing dietary lipids differing in their origin. |
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Authors:
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Eva Katharina Richter; Jorge E Spangenberg; Michael Kreuzer; Florian Leiber |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of agricultural and food chemistry Volume: 58 ISSN: 1520-5118 ISO Abbreviation: J. Agric. Food Chem. Publication Date: 2010 Jul |
Date Detail:
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Created Date: 2010-07-07 Completed Date: 2010-10-21 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0374755 Medline TA: J Agric Food Chem Country: United States |
Other Details:
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Languages: eng Pagination: 8048-55 Citation Subset: IM |
Affiliation:
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Institute of Plant, Animal and Agroecosystem Sciences, ETH Zurich, Universitaetstrasse 2, CH-8092 Zurich, Switzerland. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Brassica rapa
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chemistry* Carbon Isotopes / analysis Deuterium / analysis Fatty Acids / analysis* Isotope Labeling Oxygen Isotopes / analysis Plant Oils / analysis* |
| Chemical | |
Reg. No./Substance:
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0/Carbon Isotopes; 0/Fatty Acids; 0/Oxygen Isotopes; 0/Plant Oils; 7782-39-0/Deuterium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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