title: Adsorption and desorption characteristics of adlay bran free phenolics on macroporous resins.
abstract: In this study, the adsorption and desorption characteristics of six macroporous resins including XAD-7HP, XAD-16, HP-20, HP-2MGL, SP-207 and SP-825 for enrichment of adlay bran free phenolics were studied. XAD-16, SP-207 and SP-825 were chosen for further study due to their strong adsorption and desorption capacities. XAD-16, SP-207 and SP-825 had similar phenolics adsorption/desorption behaviors. Pseudo-second-order kinetics model and Freundlich isotherm model were suitable for describing the whole exothermic and physical adsorption processes of adlay bran free phenolics on XAD-16, SP-207 and SP-825. After treatment with gradient elution on XAD-16 resin column, the free phenolics were mostly enriched (from 89.61 to 1015.26mg/100g) in 50% ethanol fraction. The oxygen radical absorbance capacity of 50% ethanol fraction was eight times higher than that of the crude extract. Therefore, the production of highly concentrated phenolics might expand the application of adlay bran used as a bioactive ingredient in functional food.
authors.affiliation: College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China; Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center, South China University of Technology, Guangzhou 510640, China.
authors.forename: Qingyun
authors.initials: Q
authors.lastname: Yang
authors.affiliation: College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China; Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center, South China University of Technology, Guangzhou 510640, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
authors.forename: Mouming
authors.initials: M
authors.lastname: Zhao
authors.affiliation: College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China; Guangdong Food Green Processing and Nutrition Regulation Technologies Research Center, South China University of Technology, Guangzhou 510640, China. Electronic address: felzlin@scut.edu.cn.
authors.forename: Lianzhu
authors.initials: L
authors.lastname: Lin
mesh_terms: D000327:Adsorption; D000975:Antioxidants; D004043:Dietary Fiber / Q000032:analysis*; D007700:Kinetics; D010636:Phenols / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D012116:Resins, Plant / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D004043:Dietary Fiber; D010636:Phenols; D010936:Plant Extracts; D012116:Resins, Plant
keywords: Adlay bran; Adsorption behaviors; Antioxidants; Free phenolics; Macroporous resins