title: Effects of different treatments on the antioxidant properties and phenolic compounds of rice bran and rice husk.
abstract: We investigated the changes of antioxidant activity and bioactive compounds in bran, rice husk and ground rice husk after three different treatments, namely hot-air, far-infrared radiation (FIR), and cellulase, compared with raw samples. Overall, FIR-treated group showed a higher DPPH radical scavenging activities, ferric reducing antioxidant power (FRAP), and total phenolic content (TPC) than did hot-air and cellulase treatments for all samples. A significant increase in α- and γ-tocopherols was found in FIR irradiated rice bran compared to raw bran, while α- and γ-tocopherols in hot-air and cellulase treated rice bran were remained unchanged. Cellulase significantly increased the amount of vanillic acid; however a dramatic decrease of ferulic acid was observed. The contents of γ-oryzanol in cellulase treated ground rice husk were significantly increased. Decreasing particle size in the husk was found to work positively for enhancing antioxidant activities, γ-oryzanol and phenolic compounds.
authors.affiliation: Research Unit of Process and Product Development of Functional Foods, Department of Food Technology and Nutrition, Faculty of Technology, Mahasarakham University, Kuntarawichai, Mahasarakham 44150, Thailand.
authors.forename: Pitchaporn
authors.initials: P
authors.lastname: Wanyo
authors.affiliation: Research Unit of Drying Technology for Agricultural Products, Faculty of Engineering, Mahasarakham University, Kuntarawichai, Mahasarakham 44150, Thailand.
authors.forename: Naret
authors.initials: N
authors.lastname: Meeso
authors.affiliation: Research Unit of Process and Product Development of Functional Foods, Department of Food Technology and Nutrition, Faculty of Technology, Mahasarakham University, Kuntarawichai, Mahasarakham 44150, Thailand. Electronic address: sirithons@hotmail.com.
authors.forename: Sirithon
authors.initials: S
authors.lastname: Siriamornpun
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D012275:Oryza / Q000737:chemistry*; D010636:Phenols / Q000032:analysis*; D010936:Plant Extracts / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D010636:Phenols; D010936:Plant Extracts
keywords: Drying; Enzymatic; FIR; Phenolic compounds; Rice bran; Rice husk