Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 10, Pages 6095-6103Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.02.033
Keywords
Antioxidation activity; Monosaccharide composition; Paenibacillus polymyxa SQR-21; Polysaccharides
Funding
- Agricultural Ministry of China [201103004]
- Chinese Ministry of Science and Technology [2010AA10Z401]
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The optimization, purification and characterization of an extracellular polysaccharide (EPS) from a bacterium Paenibacillus polymyxa SQR-21 (SQR-21) were investigated. The results showed that SQR-21 produced one kind of EPS having molecular weight of 8.96 x 10(5) Da. The EPS was comprised of mannose, galactose and glucose in a ratio of 1.23:1.14:1. The ratio of monosaccharides and glucuronic acid was 7.5:1. The preferable culture conditions for EPS production were pH 6.5, temperature 30 degrees C for 96 h with yeast extract and galactose as best N and C sources, respectively. The maximum EPS production (3.44 g L-1) was achieved with galactose 48.5 g L-1, Fe3+ 242 mu M and Ca2+ 441 mu M. In addition, the EPS showed good superoxide scavenging, flocculating and metal chelating activities while moderate inhibition of lipid peroxidation and reducing activities were determined. These results showed the great potential of EPS produced by SQR-21 to be used in industry in place of synthetic compounds. (C) 2011 Elsevier Ltd. All rights reserved.
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