title: Antioxidant activity of a water-soluble polysaccharide purified from Pteridium aquilinum.
abstract: A water-soluble crude polysaccharide, obtained from fern Pteridium aquilinum, was fractionated by DEAE-Sepharose Fast-Flow column chromatography, and purified by Sephacryl S-400 HR column chromatography. The average molecular weight (M(w)) of the purified polysaccharide (PLP) is 458,000 Da. The monosaccharide components of PLP were characterized by gas chromatography (GC), and the majority of the monosaccharide components was glucose (relative mass 58.1%) with low levels of galactose, mannose, rhamnose, and arabinose (relative mass 18.7%, 6.8%, 10.2%, and 6.1%, respectively). The Fourier-transform infrared spectra (FTIR) of PLP revealed typical characteristics of polysaccharides. On the basis of the ferric-reducing antioxidant power assay (FRAP), DPPH radical-scavenging, the superoxide radical assay, and self-oxidation of 1,2,3-phentriol assay, the antioxidant activities of PLP were investigated. The purified polysaccharide was demonstrated to have strong reductive power (FRAP value: 827.6 micromol/L), moderate scavenging activities against DPPH radicals (83.1%) and superoxide radicals (60.5%), and moderate inhibiting power for self-oxidation of 1,2,3-phentriol (52.4%).
authors.affiliation: Laboratory of Food safety, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
authors.forename: Wentao
authors.initials: W
authors.lastname: Xu
authors.forename: Fangfang
authors.initials: F
authors.lastname: Zhang
authors.forename: Yunbo
authors.initials: Y
authors.lastname: Luo
authors.forename: Liyan
authors.initials: L
authors.lastname: Ma
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Kou
authors.forename: Kunlun
authors.initials: K
authors.lastname: Huang
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification*; D001713:Biphenyl Compounds / Q000737:chemistry; D002849:Chromatography, Gas; D005290:Ferric Compounds / Q000737:chemistry; D008970:Molecular Weight; D010084:Oxidation-Reduction; D010851:Picrates / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry / Q000302:isolation & purification*; D032498:Pteridium / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013481:Superoxides / Q000737:chemistry
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D005290:Ferric Compounds; D010851:Picrates; D011134:Polysaccharides; D013481:Superoxides; C004931:1,1-diphenyl-2-picrylhydrazyl