Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 79, Issue -, Pages 533-541Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2015.05.024
Keywords
Salvia miltiorrhiza Bunge residue; Polysaccharide; Antioxidant activity
Funding
- Technological Innovation of Small and Medium-sized Enterprises (SME) Fund of Sichuan Province [13CX02806098]
- National SME Technology Innovation Fund [14C26215102921]
- Science and Technology Program Project Fund of Sichuan Province [2014FZ0056]
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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 degrees C, and ratio of water to raw material of 32 mL/g. Moreover, a new polysaccharide with antioxidant activity [i.e., SMWP-1 (similar to 5.27 x 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. (C) 2015 Elsevier B.V. All rights reserved.
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