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Antioxidant and in vitro digestion property of black rice (Oryza sativa L.): a comparison study between whole grain and rice bran

  • Hui Zhang , Guoyin Kai , Yongjun Xia , Guangqiang Wang and Lianzhong Ai EMAIL logo
Published/Copyright: August 3, 2020

Abstract

A comparison study between whole grain and rice bran to evaluate the antioxidant activity and starch digestion property of black rice was conducted. Total phenolics content (TPC) and total anthocyanins content (TAC) analysis found that TPC and TAC contribution of rice bran to the whole grain were over 73 and 91%, respectively. Cyanidin-3-glucoside with minor peonidin-3-glucoside were identified in all whole grain and rice bran samples by HPLC-ESI-MS. The rice bran exhibited much stronger antioxidant activities than the whole grain, acting as the major antioxidant contributor to the black rice due to the high levels of TPC and TAC. In vitro digestion analysis found that rice bran could significantly decrease the digestibility and predicted glycemic index (pGI) of rice flour by lowering the rapid digestion starch and increasing the resistant starch (RS). This study revealed that rice bran could be a potential edible resource of phenolic-enriched antioxidant and glycemic regulator in food industry.


Corresponding author: Lianzhong Ai, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai, 200093, China, E-mail:

Funding source: Key Research & Development Project of Shandong Province

Award Identifier / Grant number: 2018YYSP003

Funding source: Shanghai Agriculture Applied Technology Development Program, China

Award Identifier / Grant number: 2019-02-08-00-07-F01152

Award Identifier / Grant number: 31601428

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: The financial support for this study by the National Natural Science Foundation of China (No: 31601428), and Shanghai Agriculture Applied Technology Development Program, China (No. 2019-02-08-00-07-F01152), and Key Research & Development Project of Shandong Province (No. 2018YYSP003) is gratefully acknowledged.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2019-08-23
Accepted: 2020-07-09
Published Online: 2020-08-03

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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