title: Optimization of extraction and antioxidant activity of polysaccharides from Salvia miltiorrhiza Bunge residue.
abstract: In this study, the process of extracting polysaccharides from Salvia miltiorrhiza Bunge residue was optimized by using a Box-Behnken design. Statistical analysis of the results showed that the linear and quadratic terms of the three variables of the extraction process had significant effects. The optimal conditions are as follows: extracting time of 2.6 h, extraction temperature of 89 °C, and ratio of water to raw material of 32 mL/g. Moreover, a new polysaccharide with antioxidant activity [i.e., SMWP-1 (∼5.27×10(5) Da)] was isolated from S. miltiorrhiza residue. The carbohydrate, uronic acid, and protein contents of SMWP-1 were 90.11%, 0.13%, and 0.53%, respectively. The SMWP-1 is composed of glucose, xylose, mannose, and galactose. The preliminary structural characterization of SMWP-1 was determined via Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM) analyses. This polysaccharide exhibited strong reducing power and free-radical scavenging activities in vitro against 2,2-diphenyl-1-picrylhydrazyl, superoxide anion, and hydroxyl. Therefore, SMWP-1 can be investigated further as a novel natural antioxidant.
authors.affiliation: College of Life Science, Sichuan Agricultural University, Yaan, Sichuan 625014, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Sichuan 611130, China.
authors.forename: Long
authors.initials: L
authors.lastname: Wang
authors.affiliation: College of Science, Sichuan Agricultural University, Yaan, Sichuan 625014, China. Electronic address: zhang8434@sina.com.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.affiliation: College of Life Science, Sichuan Agricultural University, Yaan, Sichuan 625014, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.affiliation: Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Sichuan 611130, China.
authors.forename: Yonghong
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: College of Life Science, Sichuan Agricultural University, Yaan, Sichuan 625014, China.
authors.forename: Chunbang
authors.initials: C
authors.lastname: Ding
authors.affiliation: College of Life Science, Sichuan Agricultural University, Yaan, Sichuan 625014, China.
authors.forename: Ruiwu
authors.initials: R
authors.lastname: Yang
authors.affiliation: College of Life Science, Sichuan Agricultural University, Yaan, Sichuan 625014, China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Wang
authors.affiliation: Chengdu Dadi Hank Biological Technology Limited-liability Company, Wenjiang, Sichuan 611130, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Yu
mesh_terms: D001713:Biphenyl Compounds / Q000737:chemistry; D002850:Chromatography, Gel; D016166:Free Radical Scavengers / Q000737:chemistry* / Q000302:isolation & purification; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D027561:Salvia miltiorrhiza / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013481:Superoxides / Q000737:chemistry
chemical_list: D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D010851:Picrates; D010936:Plant Extracts; D011134:Polysaccharides; D013481:Superoxides; C004931:1,1-diphenyl-2-picrylhydrazyl
keywords: Antioxidant activity; Polysaccharide; Salvia miltiorrhiza Bunge residue