Phytochemical Composition of <Emphasis Type="Italic">Oryza sativa</Emphasis> (Rice) Bran Oil Bodies in Crude and Purified Isolates |
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Authors: | Nantaprapa Nantiyakul Samuel Furse Ian Fisk Timothy J Foster Gregory Tucker David A Gray |
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Affiliation: | 1.Division of Food Sciences, School of Biosciences,University of Nottingham,Nottinghamshire,UK;2.Division of Nutritional Sciences, School of Biosciences,University of Nottingham,Nottinghamshire,UK;3.School of Biosciences,University of Nottingham,Nottinghamshire,UK |
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Abstract: | We describe a procedure for isolating and purifying oil bodies (OBs) from Oryza sativa bran, and present evidence that strongly suggests a physical association between the OB organelles and several antioxidant phytochemicals (γ-oryzanol and several tocochromanols). This suggestion arises from work showing that despite comprehensive washing steps (9 M urea, water), the majority of the tocotrienols and tocopherols (77 and 73 %, respectively) and oryzanols (91 %) remain integral to the oil bodies, not being released unless the latter are sacrificed. This in turn provides a valuable comparison with similar analyses of tocochromanols in other plant species, as well as indicating that rice bran, normally a waste product from the rice industry, may provide a valuable source of antioxidants as well as protein and unsaturated fat. |
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