title: Structure characterization and antioxidant activity of a novel polysaccharide isolated from pulp tissues of Litchi chinensis.
abstract: A novel polysaccharide (LCP50S-2) with antioxidant activity was isolated from Litchi chinensis Sonn. The structure of LCP50S-2 was elucidated on the basis of physicochemical and instrumental analyses, and its average molecular weight was determined by gel permeation chromatography to be 2.19 × 10(2) kDa. The backbone of LCP50S-2 was composed of (1→3)-linked β-L-rhamnopyranosyl residues, (1→4)-linked α-D-xylopyranosyl residues, (1→4)-linked β-D-glucopyranosyl residues, and (1→4)-linked α-D-glucopyranosyl residues which branched at O-6. The two branches consisted of α-L-arabinopyranosyl residues and (1→6)-linked β-D-galactopyranosyl residues terminated with α-L-arabinopyranosyl residues, respectively. In the in vitro antioxidant assay, LCP50S-2 was found to possess DPPH radical-scavenging activity and hydroxyl radical-scavenging activity with IC(50) values of 220 and 266 μg/mL, respectively.
authors.affiliation: Department of Natural Products Chemistry, Jinan University, 601 Huangpu Avenue West, Guangzhou 510632, China.
authors.forename: Xu-Qiao
authors.initials: XQ
authors.lastname: Hu
authors.forename: Yuan-Yuan
authors.initials: YY
authors.lastname: Huang
authors.forename: Quan-Feng
authors.initials: QF
authors.lastname: Dong
authors.forename: Li-Yan
authors.initials: LY
authors.lastname: Song
authors.forename: Fei
authors.initials: F
authors.lastname: Yuan
authors.forename: Rong-Min
authors.initials: RM
authors.lastname: Yu
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification; D002240:Carbohydrate Sequence; D032125:Litchi / Q000737:chemistry*; D008969:Molecular Sequence Data; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000975:Antioxidants; D010936:Plant Extracts; D011134:Polysaccharides