Structural elucidation, distribution and antioxidant activity of bound phenolics from whole grain brown rice
文献类型： 外文期刊
作者： Feng, Zhiying 1 ; Dong, Lihong 1 ; Zhang, Ruifen 1 ; Chi, Jianwei 1 ; Liu, Lei 1 ; Zhang, Mingwei 1 ; Jia, Xuchao 1 ;
作者机构： 1.Guangdong Acad Agr Sci, Sericultural & Agrifood Res Inst, Guangdong Key Lab Agr Prod Proc, Key Lab Funct Foods,Minist Agr & Rural Affairs, Guangzhou 510610, Peoples R China
关键词： Brown rice; Bound phenolics; Structural elucidation; Distribution; Antioxidant activity
期刊名称：FOOD CHEMISTRY （ 影响因子：7.514； 五年影响因子：7.516 ）
ISSN： 0308-8146
年卷期： 2021 年 358 卷
页码：
收录情况： SCI
摘要： Chemical profiles, distribution, and antioxidant activity of bound phenolics from brown rice were investigated. Four new dehydrodiferulic acid dimers (DFA) along with eighteen known phenolics were isolated from brown rice bound phenolic extracts and their structures were determined by multiple spectroscopic methods. Among them, ferulic acid and 8-5 ' DFA were the most abundant monomeric and dimeric bound phenolics in brown rice, rice bran and polished rice. In whole brown rice, polished rice contributed more than 50% of three phenolic monomers and six phenolic dimers, while rice bran contributed more than half of the other thirteen phenolics including eight monomers, four dimers, and one trimer. All the isolated compounds exhibited oxygen radical absorbance capacity. Thomasidioic acid, caffeic acid, methyl caffeate, and 8-5 ' DC DFA displayed potent peroxyl radical scavenging capacity, and the last three compounds also showed moderate cellular antioxidant activity.
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