Phenolic content and antioxidant activity of defatted rice bran as affected by simulated gastrointestinal PH

Chan, Kim Wei and Ismail, M. (2011) Phenolic content and antioxidant activity of defatted rice bran as affected by simulated gastrointestinal PH. In: 7th Asia Pacific Conference on Clinical Nutrition, 5-8 June 2011, Bangkok, Thailand.

[img] PDF
Restricted to Repository staff only

866Kb

Abstract

Rice bran is a low cost by-product from the rice-milling industry. The objective of the present study was to investigate the phenolic and antioxidant activity changes of defatted rice bran under simulated gastrointestinal pH.Slurry of defatted rice bran and 3 other commercial flours (defatted wheat, sweet potato and rice flours) were respectively subjected to simulated gastrointestinal pH adjustment. Supernatants of the tested samples were obtained through centrifugation and its total pehnolic content (by Folin-Ciocalteu reagent) as well as antioxidant activity were evaluated. Results from the analyses shows that adjustment of gastrointestinal pH improved total phenolic content and antioxidant activities (DPPH scavenging activity, ABTS free radical scavenging activity and beta-carotene bleaching activity assay) of all tested samples (P<0.05). Besides, defatted rice bran exhibited higher antioxidant activity and phenolic content than all tested commercial flours (P<0.05). In conclusion, defatted rice bran is a very potential raw ingredient for development of nutraceutical and functional food products due to its high phenolic content and antioxidant activity as compared to other commercial edible flours. Besides, gastrointestinal pH adjustment also gives a clearer picture on the actual antioxidant activity of defatted rice bran in in-vivo digestive tract.

Item Type:Conference or Workshop Item (Paper)
Subject:Rice bran
Subject:Gastrointestinal agents
Faculty or Institute:Institute of Bioscience
ID Code:17956
Deposited By: kmportal
Deposited On:29 Sep 2011 07:50
Last Modified:21 Nov 2013 07:26

Repository Staff Only: Edit item detail

Document Download Statistics

This item has been downloaded for since 29 Sep 2011 07:50.

View statistics for "Phenolic content and antioxidant activity of defatted rice bran as affected by simulated gastrointestinal PH"


Universiti Putra Malaysia Institutional Repository

Universiti Putra Malaysia Institutional Repository is an on-line digital archive that serves as a central collection and storage of scientific information and research at the Universiti Putra Malaysia.

Currently, the collections deposited in the IR consists of Master and PhD theses, Master and PhD Project Report, Journal Articles, Journal Bulletins, Conference Papers, UPM News, Newspaper Cuttings, Patents and Inaugural Lectures.

As the policy of the university does not permit users to view thesis in full text, access is only given to the first 24 pages only.