期刊
FOOD CHEMISTRY
卷 104, 期 4, 页码 1670-1677出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2007.03.020
关键词
anthocyanin-pigmented rice; antioxidant; alkaloid; phenolic acids; 2D NMR; DPPH; radical scavenging
As a part of our study on the analysis of bioactive secondary metabolites, we used bioactivity-guided fractionation and isolation methods to isolate five compounds from the ethyl acetate-soluble fraction of the aleurone layer of Oryza sativa cv. Heugjinjubyeo, a highly developed rice cultivar; 4-carboethoxy-6-hydroxy-2-quinolone (1), ethyl -3,4-dihydroxybenzoic acid (2), 4-hydroxy-3-methoxyphenyl acetic acid (3), 3,4-dihydroxybenzoic acid (4), and 4-hydroxy-3-methoxy cinnamic acid (5). These compounds showed significant antioxidant activity in a concentration-dependent manner through the scavenging of 1,1-diphenyl-2-picrylhydrazyl radicals. The structure of new compound I was elucidated on the basis of spectroscopic evidence, particularly the results obtained via hetero-nuclear multiple-bond connectivity and high-resolution NIS spectroscopy. (c) 2007 Elsevier Ltd. All rights reserved.
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