Estracellular polysaccharide formed by Pseudomonas hydrogenovora in autotrophic culture and its physiological activities.

Gram negative hydrogen bacterium Pseudomonas hydrogenovora was found to excrete an anthrone-H2SO4 positive viscous polysaccharide.About 12 g/liter of the polysaccharide was produced autotrophically on gaseous hydrogen at the stationary phase of growth.Biosyn thesis of the polysaccharide occurred under nitrogen-deficient condition.Its elementary composition was C: 39.29%, H: 6.23%, 0: 49.67%, N: 0.21% and ash 4.6%.The polysac charide contained galactose, glucose, mannose and rhamnose as its main components.The polysaccharide had anti-tobacco mosaic virus and anti-tumor activities.