Flow properties of haloarchaeal polysaccharides in aqueous solutions
Flow properties of haloarchaeal polysaccharides in aqueous solutions
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DOI：
10.1016/s0032-3861(98)00118-9
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发表时间：
1998-12-01
期刊：
影响因子：
4.6
通讯作者：
Marcilla, A
中科院分区：
文献类型：
--
作者：
Boan, IF;Garcia-Quesada, JC;Marcilla, A
研究了海洋嗜盐菌ATCC 33500及其超级突变体Eps++、R4和Eps++产生的多糖的流动特性。R4重复单元是含有甘露糖和2-乙酰氨基-2-脱氧葡萄糖醛酸的三糖，也存在酯硫酸酯基团。为了比较两种聚合物的性质，在不同的积分时间和使用不同浓度的聚合物进行了粘度测量。在所测定的实验条件下，两种聚合物均未检测到施加应力时间的影响。观察到了强烈的假塑性行为，这种行为随着聚合物浓度的增加而增加。这两种聚合物的粘度差异是由于分子量不同造成的。用改进的Cross模型对实验数据进行关联，得到了很好的结果。(C)1998爱思唯尔科学有限公司。保留所有权利。
The flow properties of the polysaccharides produced by Haloferax mediterranei(T) ATCC 33500 and its super mutant Haloferax mediterranei EPS++, R4 and EPS++ respectively, were investigated. The R4 repeating unit is a trisaccharide containing mannose and 2-acetamido-2-deoxyglucuronic acid, ester sulphate groups are also present. In order to compare the properties of both polymers viscosimetric measurements were carried out at different integration times and using different concentrations of polymer. Under the assayed experimental conditions no effect of the time applying stress is detected for either polymer. A strong pseudoplastic behaviour is observed which is increased as the polymer concentration rises. Differences in viscosity between both polymers are due to the different molecular weights. The correlation of the experimental data using a modification of the Cross model has given very good results. (C) 1998 Elsevier Science Ltd. All rights reserved.