title: Effect of far-infrared radiation on the antioxidant activity of rice hulls.
abstract: After far-infrared (FIR) radiation onto rice hull, a methanolic extract was prepared for the determination of antioxidant ability. After 30 min of FIR treatment, the radical scavenging activity and total phenol contents of rice hull extracts increased from 47.74 to 79.63% and from 0.12 to 0.19 mM, respectively, compared to control. Inhibition of lipid peroxidation in extracts was also increased from 41.07 to 47.96%. According to the GC-MS analysis, more phenolic compounds (p-coumaric acid, 3-vinyl-1-oxybenzene, p-hydroxybenzaldehyde, vanillin, p-hydroxybenzoic acid, and 4,7-dihydroxyvanillic acid) were detected in FIR-irradiated rice hull extract. These results indicated that FIR radiation onto rice hull could liberate and activate covalently bound phenolic compounds that have antioxidant activities.
authors.affiliation: Visiting Scholar, Iowa State University, Ames, Iowa 50011-3150, USA. sclee@kyungnam.ac.kr
authors.forename: Seung-Cheol
authors.initials: SC
authors.lastname: Lee
authors.forename: Jeong-Han
authors.initials: JH
authors.lastname: Kim
authors.forename: Seok-Moon
authors.initials: SM
authors.lastname: Jeong
authors.forename: Dong-Ryul
authors.initials: DR
authors.lastname: Kim
authors.forename: Jung-Uk
authors.initials: JU
authors.lastname: Ha
authors.forename: K C
authors.initials: KC
authors.lastname: Nam
authors.forename: D U
authors.initials: DU
authors.lastname: Ahn
mesh_terms: D000975:Antioxidants / Q000032:analysis* / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000032:analysis; D008401:Gas Chromatography-Mass Spectrometry; D007259:Infrared Rays; D015227:Lipid Peroxidation / Q000187:drug effects; D012275:Oryza / Q000737:chemistry*; D010636:Phenols / Q000032:analysis; D010936:Plant Extracts / Q000737:chemistry; D012639:Seeds / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D010636:Phenols; D010936:Plant Extracts