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http://dx.doi.org/10.3746/jkfn.2009.38.10.1392

Effect of Organic Acid Pre-Treatment followed by Hydrothermal Treatment on Antioxidant Activity of Rice Hull Extract  

Park, Sun-Min (Dept. of Food Science and Biotechnology, Kyungnam University)
Lee, Seung-Cheol (Dept. of Food Science and Biotechnology, Kyungnam University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.38, no.10, 2009 , pp. 1392-1396 More about this Journal
Abstract
Antioxidative effects of rice hull extracts pre-treatment with various organic acids were evaluated. After incubating rice hull in 50 mM of five different organic acid solutions (acetic, citric, lactic, phosphoric, and tartaric acid) for 18 hours at room temperature, hydrothermal treatment at $121^{\circ}C$ for 30 min was carried out. Antioxidant activity of the rice hull extract was evaluated by determining total phenol contents (TPC), DPPH radical scavenging activity (RSA), reducing power (RP), and ABTS RSA. Pre-treatment with 50 mM phosphoric acid significantly increased TPC, DPPH RSA, and RP, while it decreased ABTS RSA. The effect of phosphoric acid concentration was also determined. TPC and DPPH RSA of rice hull extract increased with concentration of pre-treated phosphoric acid; in contrast, RP showed the reverse pattern. The results indicated that pre-treatment of rice hull with organic acid was very effective for increasing phenolic compounds and antioxidant activity of rice hull extract.
Keywords
rice hull; organic acid; pre-treatment; total phenolic contents; antioxidant activity;
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