Citation: . RHEOLOGICAL BEHAVIOR OF ERWINIA GUM IN AQUEOUS SOLUTION*[J]. Chinese Journal of Polymer Science, ;1999, 17(6): 557-561. shu

RHEOLOGICAL BEHAVIOR OF ERWINIA GUM IN AQUEOUS SOLUTION*

Received Date: 8 December 1998

Erwinia (E) gum, an extracellular polysaccharide, is composed of fucose, galatose, glucose andglucuronic acid. Its viscosity behavior was investigated by a low-shear-rate multiball viscometer and arotational viscometer. Its weight-average molecular weight Mw and intrinsic viscosity [η] in 0.2 mol/L NaClaqueous solution were measured by light scattering method at 35℃ and viscometry at 25℃ and found to be1.06×106 g/mol and 1050 mL/g, respectively, and its aggregates in aqueous solution were proved by gel permeation chromatography (GPC).These results indicated that E gum in water has exceedingly high viscosity and exhibiys Binham fluid behavior,owing to its aggregation.The viscosity of E gum decreased with increasing temperature,and the turning point appeared at 38℃ for dilute solution and 80℃ for concentrated solution suggesting that the affregates of E gum in water started to disaggregate under these temperatures.In addition,the aggregates can be disrupted by adding either acid or base.The experimental results indicated that the E gum is a good thickening agent,and its fluid behavior is similar to xanthan.
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