Oxygenated fatty acids of oil from sunflower seeds after prolonged storage |
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Authors: | K L Mikolajczak R M Freidinger C R Smith Jr I A Wolff |
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Affiliation: | (1) Northern Regional Research Laboratory, 61604 Peoria, Illinois;(2) Present address: Dept. of Chemistry, University of Illinois, Urbana, Illinois |
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Abstract: | Chemical analysis of a number of sunflower (Helianthus annuus) seed oil samples revealed a low and variable percentage of hydrogen bromide-reactive material. To characterize the compounds
responsible for this reactivity, oil was extracted from selected introductions from Uruguay, Turkey, and Yugoslavia that had
been subjected to prolonged storage. Two epoxy fatty acids and two conjugated dienolic acids were isolated from the methyl
esters derived from these sunflower seed oils by using a combination of column chromatography and countercurrent distribution.
The epoxy acids arecis-9,10-epoxystearic acid (0.5%) andcis-9,10-epoxy-cis-12-octadecenoic (coronaric) acid (2.2%). Characterization of the dienols revealed that they are 9-hydroxy-trans-10,cis-12-octadecadienoic acid (1.2%) and 13-hydroxy-cis-9,trans-11-octadecadienoic acid (1.3%). Fresher seed of some of these introductions contained less of the oxygenated components.
Oil from recently produced seed of selected high-oil Russian sunflower varieties, including some currently grown in the United
States, contained no more than trace amounts of oxygenated acids. Though the relative contributions of genetic and environmental
factors toward genesis of oxygenated acids are not established, increase of those acids in some sunflower lines as a result
of storage has been demonstrated.
Presented at the AOCS-AACC Joint Meeting, Washington, D. C., April 1968.
No. Utiliz. Res. Dev. Div., ARS, USDA. |
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