title: Composition and antioxidant activities of four polysaccharides extracted from Herba Lophatheri.
abstract: Four polysaccharides (BLF80-A, BLF80-B, BLF80-C and BLF80-D) were isolated by hot-water extraction and purified from the leaves of Herba Lophatheri by DEAE-Sepharose fast flow. Their chemical and physical characteristics were determined and antioxidant activities were investigated on the basis of DPPH radical assay, hydroxyl radical assay and superoxide radical assay. The results showed that four polysaccharides exhibited antioxidant activities in a concentration-dependent manner, and the higher molecular weight, the stronger antioxidant activities of polysaccharides. Besides, the monosaccharide compositions of polysaccharides also influence their antioxidant activities. BLP80-D showed the strongest scavenging ability, followed by BLP80-C, BLP80-B and BLP80-A.
authors.affiliation: Key Laboratory of Chemical and Biological Processing Technology for Farm Products of Zhejiang Province, School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou, 310023, PR China. gq0318@163.com
authors.forename: Qing
authors.initials: Q
authors.lastname: Ge
authors.forename: Jian-wei
authors.initials: JW
authors.lastname: Mao
authors.forename: Xiao-qing
authors.initials: XQ
authors.lastname: Guo
authors.forename: Yi-feng
authors.initials: YF
authors.lastname: Zhou
authors.forename: Jing-yan
authors.initials: JY
authors.lastname: Gong
authors.forename: Shuang-rong
authors.initials: SR
authors.lastname: Mao
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D005609:Free Radicals / Q000037:antagonists & inhibitors; D008970:Molecular Weight; D009005:Monosaccharides / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D005609:Free Radicals; D009005:Monosaccharides; D010936:Plant Extracts; D011134:Polysaccharides
keywords: Antioxidant activities; Herba Lophatheri; Polysaccharides