These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Optimization, purification, characterization and antioxidant activity of an extracellular polysaccharide produced by Paenibacillus polymyxa SQR-21.
    Author: Raza W, Makeen K, Wang Y, Xu Y, Qirong S.
    Journal: Bioresour Technol; 2011 May; 102(10):6095-103. PubMed ID: 21392978.
    Abstract:
    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 × 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°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), Fe(3+) 242 μM and Ca(2+) 441 μM. 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.
    [Abstract] [Full Text] [Related] [New Search]