Variation in lipid composition of niger seed (Guizotia abyssinica Cass.) Samples collected from different regions in ethiopia |
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Authors: | Paresch Chandra Dutta Seved Helmersson Eshetu Kebedu Getinet Alema Lars-Åke Appelqvist |
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Affiliation: | (1) Department of Food Hygiene, Swedish University of Agricultural Sciences, S-75007 Uppsala, Sweden;(2) Present address: Department of Food Science, Swedish University of Agricultural Sciences, Box 7051, S-750 07 Uppsala, Sweden;(3) Present address: Food Research and Development Centre, Ethiopian Food Corporation, P.O. Box 5688, Addis Ababa, Ethiopia;(4) Present address: Ethiopian Oilseeds Improvement Project, I.A.R., P.O. Box 2003, Addis Ababa, Ethiopia;(5) Department of Food Science, Swedish University of Agricultural Sciences, Box 7051, S-750 07 Uppsala, Sweden |
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Abstract: | Niger seed samples were collected from different regions in Ethiopia for determination of oil content, and of fatty acid, tocopherol and sterol composition in the seed oil by gas-liquid chromatography and high-performance liquid chromatography methods. There was a large variation in oil content, ranging from 29 to 39%. More than 70% of the fatty acids was linoleic acid (18∶2) in all samples analyzed. The other predominant fatty acids were palmitic (16∶0), stearic (18∶0) and oleic (19∶1) at a range of 6 to 11% each. Total polar lipids recovered after preparative thin-layer chromatography comprised a small fraction of the total lipids. They had higher 16∶0 and lower 18∶2 contents than the triacylglycerols.α-Tocopherol was the predominant tocopherol in all samples, 94–96% of the total amounting to 630–800 μg/g oil. More than 40% of the total sterols wasβ-sitosterol,ca. 2000μg/g oil. The other major sterols were campesterol and stigmasterol, ranging from 11 to 14%. The Δ5- and Δ7-avenasterols were in the range of 4 to 7%. From the samples studied, no conclusion could be drawn regarding the influence of altitude or location on oil content, tocopherol and/or sterol contents. The results of the present study on niger seed oil are discussed in comparison with known data for common oils from Compositae,viz, safflower and sunflower. |
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Keywords: | Fatty acids Guizotia abyssinica Cass nigher seed oil sterols tocopherols |
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