Agar-Like Polysaccharide Produced by a Pseudomonas Species: Production and Basic Properties

摘要: A new species of Pseudomonas was isolated that produced copious amounts an exocellular heteropolysaccharide (PS-60) after incubation for 3 days at 30°C in media containing 3% glucose as a carbon source. The polysaccharide composed approximately 46% and 30% rhamnose and, addition, contained 21% uronic acid O-acetyl. Upon deacetylation by mild alkaline treatment, PS-60 brittle, firm, optically clear gel. This gelling property thermoreversible. gel exhibited excellent heat stability withstood autoclaving (i.e., 121°C 15 min) several cycles. strength, melting point, setting point the were controlled primarily concentration cations. not affected variety enzymes. results tests involving various culture biochemical test indicate is alternative agent to agar.