title: Comparison of the activities of hydrophilic anthocyanins and lipophilic tocols in black rice bran against lipid oxidation.
abstract: The antioxidant capabilities of anthocyanin and tocol extracts from black rice bran were evaluated using an emulsion system containing either cholesterol (1.0mg/ml) or fish oil (10mg/ml). The cholesterol oxidation product, 7-ketocholesterol, increased to 180.1 μg/ml in the control emulsion after 168 h of oxidation, while it was only 15.4 and 39.0 μg/ml in the emulsions containing 1 μg/ml of the anthocyanin and tocol extracts, respectively; but below 1.2 μg/ml in the emulsion having 5 μg/ml of anthocyanins or tocols. In the fish oil emulsion, over 80% of C20:5 and C22:6 were oxidised after a 48 h incubation at 37°C, while they were retained above 38% and 65% in the emulsions containing 10 μg/ml of anthocyanins and tocols, respectively, and above 85% in the emulsion containing 20 μg/ml of anthocyanins or tocols. Compared with the tocols extract, the capability of the anthocyanin extract was relatively greater in stabilising cholesterol but lower in inhibiting fatty acids oxidation.
authors.affiliation: The Key Laboratory of Tropical Fruit Biology of Ministry of Agriculture, The South Subtropical Crop Research Institute, Chinese Academy of Tropical Agricultural Science, Zhanjiang, China.
authors.forename: Xiumei
authors.initials: X
authors.lastname: Zhang
authors.forename: Yixiao
authors.initials: Y
authors.lastname: Shen
authors.forename: Witoon
authors.initials: W
authors.lastname: Prinyawiwatkul
authors.forename: Joan M
authors.initials: JM
authors.lastname: King
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Xu
mesh_terms: D000872:Anthocyanins / Q000737:chemistry* / Q000302:isolation & purification; D057927:Hydrophobic and Hydrophilic Interactions; D008055:Lipids / Q000737:chemistry*; D012275:Oryza / Q000737:chemistry*; D010084:Oxidation-Reduction; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification; D024505:Tocopherols / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000872:Anthocyanins; D008055:Lipids; D010936:Plant Extracts; D024505:Tocopherols; C572520:tocol