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The cultural condition of P.serrdnrnonas morrdrwina for polysaccharide production was examined. The optimal medium contains following composition per liter of distilled water: Sucrose 23.75g, (NH₄)₂SO₄ 1.57g, Yeast extract 0.5g, KH₂P0₄2.Og, MgS0₄7H₂0 1.Og, CaC0₃2.5g. The optimum temperature and pH were 30℃ and 6.5. At the condition, Ps mendocina produced 5.98 g/l of polysaccharide. The culture viscosity after 3 days was 191 mPa,s at 70 sec^(-1). The product yield (Y_(p/s)) and specific productivity (Q_p) were 25.18% and 32.83 mg/g-cell/h.
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