Method for purifying microbial polysaccharides

Details Method for purifying microbial polysaccharides Method for purifying microbial polysaccharides

1976-12-27

1978-06-13

Jones, Raymond N.

Textiles: fiber preparation

195 31P, C12D 1304

Patent

active

040947394

ABSTRACT:
Microbial polysaccharides such as xanthan gum sometimes form cloudy suspensions rather than clear solutions when dispersed in water because of the presence of microbial cells therein. An aqueous polysaccharide solution (e.g., the fermentation broth) may be clarified by killing remaining microbial cells (e.g., by pasteurization) and conducting a second fermentation in the presence of an easily filterable microorganism capable of consuming said killed cells. The easily filterable microorganism is typically a fungus and preferably a mold such as the Trichoderma sp. molds. Following the second filtration, the cells of the easily filterable microorganism are preferably removed from the mixture, typically by filtration or centrifugation.

REFERENCES:
patent: 3436346 (1969-04-01), Westover et al.
patent: 3591578 (1971-07-01), Colin et al.
patent: 3994780 (1976-11-01), Klass et al.
patent: 4010071 (1977-03-01), Colegrove
The American Type Culture Collection Catalogue of Strains, Rockville, Maryland, (1976), p. 310.
Laskin et al., Handbook of Microbiology, vol. 1, CRC Press, Cleveland, (1973), pp. 432, 767.

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