Journal of Industrial Microbiology

, Volume 16, Issue 2, pp 129–133 | Cite as

Production of an extracellular polysaccharide byAgrobacterium sp DS3 NRRL B-14297 isolated from soil

  • C T Hou
  • J A Ahlgren
  • W Brown
  • J J Nicholson


A bacterium isolated from soil and identified asAgrobacterium sp produced a water-soluble extracellular polysaccharide capable of producing highly viscous solutions. Gas chromatographic analysis revealed a sugar composition of glucose, galactose and mannose in the molar ratio of 7.5∶2.4∶1, together with 3.7% (w/w) pyruvic acid. Methylation analyses showed the presence of (1→3)-, (1→4)- and (1→6)-linked glucose, (1→3)- and (1→4, 1→6)-linked galactose and a small portion of (1→3)-linked mannose residues. Succinic acid was not present. The molecular weight of the polysaccharide was estimated by light scattering to be 2×106 Da. The viscosity of solutions containing the polysaccharide remained constant from pH 3 to 11, and decreased by 50% when heated from 5 to 55°C. Maximum yield of the polysaccharide, 20 g L−1, was reached in 48 h at 30°C incubation.


extracellular polysaccharide Agrobacterium viscous polysaccharide 


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Copyright information

© Society for Industrial Microbiology 1996

Authors and Affiliations

  • C T Hou
    • 1
  • J A Ahlgren
    • 2
  • W Brown
    • 1
  • J J Nicholson
    • 2
  1. 1.Oil Chemical ResearchUSDAPeoriaUSA
  2. 2.Biopolymer Research Unit, National Center for Agricultural Utilization Research, ARSUSDAPeoriaUSA

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