The Antioxidant Activity of Rice Bran Extract of Khao Dawk Mali 105 Buriram Province

Abstract

The purpose of this research was to study the antioxidant activity of rice bran extracts of Khao Dawk Mali 105. The population was rice bran of Khao Dawk Mali 105 in Buriram province. The samples were rice bran from Ban Sawai Jeek, Ban Sa Nuan Nok, Muang District, and Ban Khok Muang, Pra Khon Chai District, Buriram Province.  The procedures of the research were as follows: studied the suitable solvent for extraction and the total polyphenol content antioxidant activity DPPH (DPPH) and performed statistical analysis by computer program (SPSS). It was found that methanol solvent extracted rice bran gave the highest percentage yield (%yield). The total polyphenol content was found in rice bran extract from Ban Sawai Jeek at 58.67, Ban Sa Nuan Nok at 39.70, and Ban Khok Mueang at 32.70 mg GAE/g DW. When studying the antioxidant activity DPPH (DPPH) as a percentage inhibition of free radicals (%Inhibition), it was found that Ban Sa Nuan Nok was 95.17%; Ban Sawai Jeek was 85.96%; and Ban Khok Muang was 50.98%. DPPH antioxidant activity was equivalent to vitamin C (mg Vitamin C/g DW). Ban Sa Nuan Nok was 61.91; Ban Sawai Jeek was 57.35; and Ban Khok Muang was 34.65 mg Vitamin C/g DW. When analyzing the statistical value (One way analysis of variance : One way ANOVA) of antioxidant activity value DPPH equivalent to vitamin C ( mg Vitamin C/g DW), it was found that the rice bran extracts of the 3 communities were significantly different at the 0.05 level.