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RHEOLOGICAL BEHAVIOR OF ERWINIA GUM IN AQUEOUS SOLUTION

Chinese Journal of Polymer Science 1999年第6期17卷 557-561页

作者：张俐娜 Hideki Iijima hiromichi tsuchiya Department of Chemistry Wuhan University Wuhan 430072 China Chemicals Technology Department Ⅳ Asahi Chemical Industry Co. Ltd Miyazaki 882-0847 Japan Fourth Specialty Chemical Sales Department Asahi Chemical Industry Co. Ltd. Tokyo 100-8840 Japan

Erwinia (E) gum, an extracellular polysaccharide, is composed of fucose, galatose, glucose and glucuronic acid. Its viscosity behavior was investigated by a low-shear-rate multiball viscometer and a rotational viscometer. Its weight-average molecular weight M-w and intrinsic viscosity [eta] in 0.2 mol/L NaCl aqueous solution were measured by light scattering method at 35 degrees C and viscometry at 25 degrees C and found to be 1.06 x 10(6) 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 exhibits Binham fluid behavior, owing to its aggregation. The viscosity of E gum decreased with increasing temperature, and the turning point appeared at 38 degrees C for dilute solution and 80 degrees C for concentrated solution suggesting that the aggregates 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.

关键词： rheological behavior Erwinia gum polysaccharide solution properties molecular weight aggregation

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