Lipid components of North American wild rice (Zizania palustris)

被引:2
|
作者
Przybylski, R. [1 ]
Klensporf-Pawlik, D. [3 ]
Anwar, F. [2 ]
Rudzinska, M. [3 ]
机构
[1] Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge, AB T1K 3M4, Canada
[2] Department of Chemistry, University of Agriculture, Faisalabad 38040, Pakistan
[3] Institute of Food Technology of Plant Origin, Poznan University of Life Sciences, Poznan, Poland
关键词
The content and composition of fatty acids; sterols; tocopherols; and γ-oryzanol in wild rice (Zizania palustris) grown in North America were compared with those in regular brown rice (Oryza sativa L.). The lipid content of wild rice ranged from 0.7 to 1.1%; compared with 2.7% in regular brown rice. The lipids of wild rice comprised mainly linoleic (35-37%) and linolenic (20-31%) acids. Other fatty acids included palmitic (14.1-18.4%); stearic; (1.1-1.3%); and oleic (12.8-16.2%). Wild rice lipids contained very large amounts of sterols; ranging from 70 g/kg for a Saskatchewan sample to 145 g/kg for Minnesota Naturally Grown Lake and River Rice. The main sterols found in an unsaponified fraction were: campesterol (14-52%); β-sitosterol; (19-33%); Δ5-avenasterol; (5-12%); and cycloartenol (5-12%). Some of sterols; γ-oryzanols; were present as the phenolic acid esters; the amount ranged from 459 to 730 mg/kg in wild rice lipids. The largest amounts of tocopherols and tocotrienols; 3682; and; 9378; mg/kg; were observed in North Western Ontario wild rice samples; whereas the lowest were 251 mg/kg in an Athabasca Alberta sample and 224 mg/kg in regular long-grain brown rice. The α isomer was the most abundant among tocopherols and tocotrienols. The results of this study showed that wild rice lipids contain large amounts of nutraceuticals with proven positive health effects. © 2009 AOCS;
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页码:553 / 559
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