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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of rheological properties of the exopolysaccharide of Sphingomonas paucimobilis GS-1 for application in oil exploration (1999)
    Springer
    Journal of industrial microbiology and biotechnology 23 (1999), S. 442-445 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: Sphingomonas paucimobilis GS-1 exopolysaccharide; rheological properties; biopolymer; drilling fluid; oil exploration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Analysis of an exopolysaccharide of Sphingomonas paucimobilis GS-1 (EPS/GS-1) with respect to its rheological properties, cross-linking ability with chrome alum and performance test at 75 ± 5°C revealed its strong suspending ability, shear thinning property, and thixotrophic nature which are required to impart desirable rheology to drilling mud. The organism fulfilled all the specified requirements and its properties were superior to those of currently-used XC polymer (a xanthan product) for oil drilling applications. However, EPS/GS-1 was unstable in the presence of bentonite at 100 ± 5°C during performance tests, in contrast to XC polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900737
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  • 2
    Electronic Resource
    Electronic Resource
    Emulsifying property of a viscous exopolysaccharide fromSphingomonas paucimobilis (1995)
    Springer
    World journal of microbiology and biotechnology 11 (1995), S. 219-222 
    Details
    ISSN: 1573-0972
    Keywords: Emulsification ; exopolysaccharide ; Sphingomonas paucimobilis-GS1 ; stabilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A viscous exopolysaccharide fromSphingomonas paucimobilis-GS1, emulsified xylene, benzene, 2-methylnaphthalene, hexadecane, hexane, kerosene and paraffin oil as well as castor, coconut and olive oils when used at 1 mg/ml. It stabilized the emulsions more efficiently than commercial gums such as arabic, tragacanth, karaya and xanthan. Emulsions were stable for 6 months, from 4 to 40°C and pH 4 to 10 and in the presence of NaCl up to 50 g/l. The polysaccharide had no discernible toxicity towards mice when tested using World Health Organization guidelines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00704653
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