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High viscocity diutan gums and methods of producing
专利权人:
CP KELCO US INC
发明人:
PATEL YAMINI N,COLEMAN RUSSEL,MATZKE STEVEN
申请号:
AP200804491
公开号:
AP2878A
申请日:
2006.10.31
申请国别(地区):
AP
年份:
2014
代理人:
摘要:
The present invention describes the production of a diutan polysaccharide exhibiting increased viscosity properties as compared with previously produced polysaccharide of the same type of repeating units. Such an improved diutan polysaccharide is produced through the generation of a derivative of Sphingomonas sp. ATCC 53159 that harbors a multicopy broad-host-range plasmid into which genes for biosynthesis of diutan polysaccharide have been cloned. The plasmid provides the capability within the host Sphingomonas strain to produce multiple copies of genes for such polysaccharide synthesis. In such a manner, a method of not just increased production of the target diutan polysaccharide, but also production of a diutan polysaccharide of improved physical properties (of the aforementioned higher viscosity) thereof is provided. Such a diutan polysaccharide has proven particularly useful as a possible viscosifier in oilfield applications and within cement materials. The inventive methods of production of such an improved diutan polysaccharide, as well as the novel cloned genes required to produce the improved diutan within such a method, are also encompassed within this invention. Additionally, the novel engineered Sphingomonas strain including the needed DNA sequence is encompassed within this invention.
来源网站:
中国工程科技知识中心
来源网址:
http://www.ckcest.cn/home/

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