NDLI: In vitro antioxidant activity of rice protein affected by alkaline degree and gastrointestinal protease digestion.

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In vitro antioxidant activity of rice protein affected by alkaline degree and gastrointestinal protease digestion.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Liu, Ye Wang, Zhengxuan Li, Hui Liang, Mingcai Yang, Lin
Description	Country affiliation: China Author Affiliation: Liu Y ( Department of Food Science and Engineering, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, China.); Wang Z ( Department of Food Science and Engineering, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, China.); Li H ( Department of Food Science and Engineering, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, China.); Liang M ( Department of Food Science and Engineering, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, China.); Yang L ( Department of Food Science and Engineering, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, China. ly6617@hit.edu.cn.)
Abstract	BACKGROUND: To elucidate whether and how alkali treatment, which is a common process for rice protein (RP) extraction, affects antioxidant activity of RP, the different degree of alkali (from 0.1% to 0.4% of NaOH) was used to extract RP (RP-1, RP-2, RP-3, RP-4). RESULTS: The antioxidant capacities of scavenging free radicals [2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid] diammonium salt, ABTS; 1,1-diphenyl-2-picrylhydrazyl, DPPH), chelating metals (iron, copper) and reducing power investigated in the hydrolysates of RPs (RP-1, RP-2, RP-3, RP-4) during in vitro pepsin-pancreatin digestion were effectively affected by alkali treatment. The present study demonstrated that the weakest antioxidant responses to ABTS radical-scavenging activity, DPPH radical-scavenging activity, iron chelating activity, copper chelating activity and reducing power were produced by RP-4 extracted by the highest alkali proportion (0.4% NaOH). CONCULSION: The present study indicates that antioxidant capacity of RP could be more readily depressed by strict alkali degree and affected by gastrointestinal proteases. Results suggest that alkali extraction is a vital process to regulate the antioxidant activity of RP through modifying the compositions of amino acids, which are dependent on alkali magnitude. © 2016 Society of Chemical Industry.
File Format	HTM / HTML
ISSN	00225142
Issue Number	15
Journal	Journal of the Science of Food and Agriculture
Volume Number	96
e-ISSN	10970010
Language	English
Publisher	Wiley
Publisher Date	2016-12-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Nutrition and Dietetics Food Science Biotechnology Agronomy and Crop Science

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