Optimization of extraction and antioxidant activity of polysaccharides from Salvia miltiorrhiza Bunge residue

Int J Biol Macromol. 2015 Aug:79:533-41. doi: 10.1016/j.ijbiomac.2015.05.024. Epub 2015 May 23.

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.

Keywords: Antioxidant activity; Polysaccharide; Salvia miltiorrhiza Bunge residue.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biphenyl Compounds / chemistry
  • Chromatography, Gel
  • Free Radical Scavengers / chemistry*
  • Free Radical Scavengers / isolation & purification
  • Picrates / chemistry
  • Plant Extracts / chemistry*
  • Plant Extracts / isolation & purification
  • Polysaccharides / chemistry*
  • Polysaccharides / isolation & purification
  • Salvia miltiorrhiza / chemistry*
  • Spectroscopy, Fourier Transform Infrared
  • Superoxides / chemistry

Substances

  • Biphenyl Compounds
  • Free Radical Scavengers
  • Picrates
  • Plant Extracts
  • Polysaccharides
  • Superoxides
  • 1,1-diphenyl-2-picrylhydrazyl