Antioxidant activity of Sabah rice bran

Loo, Karen (2010) Antioxidant activity of Sabah rice bran. Universiti Malaysia Sabah. (Unpublished)

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Abstract

The study was aimed to determine the antioxidant activity and total phenolic content (TPC) of Sabah rice bran using the Folin-ciocalteau method, 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity, ferric reducing antioxidant power (FRAP), ferrous ion-chelating (FIC), and lipid peroxidation inhibition (LPI) assay. The effects of different stabilization methods (i.e. microwave heating and refrigeration) on TPC and antioxidant activity were also studied. Three varieties of Sabah rice bran namely MR159, TQR2 and Sarawak were selected. All the studied samples contained different phenolic contents with higher concentration in microwave heated samples than refrigerated samples among varieties. Microwave heating shows the order of Sarawak > MR159 > TQR2 while refrigeration shows the order of Sarawak > TQR2 and MR159. In corresponding way, microwave heated samples exhibited significantly stronger DPPH scavenging activity, FRAP and LPI compared to refrigerated sample of any particular varieties in present study by referring to EC50 value. In contrast, refrigerated samples exhibit better FIC activity than microwave heated samples. Rice bran Sarawak overall possessed the strongest AOA in all assay except for FIC assay. With regard to this assay, the antioxidant efficacy of TQR2 was the highest among the studied varieties. Similar orders were observed in TPC and FRAP among the varieties for both stabilization treatment. Contents of total phenols of rice bran were positively correlated with the DPPH scavenging activity (r= 0.6895), FRAP (r= 0.8354) and LPI (r= 0.6995). Based on the result obtained, stabilized Sabah rice bran possessed effective antioxidant properties.

Item Type: Academic Exercise
Uncontrolled Keywords: Antioxidant, Total phenolic content, Sabah rice bran, MR159, TQR2
Subjects: T Technology > TS Manufactures
Divisions: SCHOOL > School of Food Science and Nutrition
Depositing User: Unnamed user with email storage.bpmlib@ums.edu.my
Date Deposited: 18 Apr 2012 03:44
Last Modified: 23 Oct 2017 03:12
URI: http://eprints.ums.edu.my/id/eprint/3901

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