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Exopolysaccharide-producing bacteria from sugar beets

A H Tallgren1, U Airaksinen, von Weissenberg R

  • 1Department of Chemical Technology, FIN-02015 Helsinki, Finland.

Applied and Environmental Microbiology
|January 30, 1999
PubMed
Summary

Researchers screened 600 microorganisms from Finnish sugar beets for slime production. Of these, 170 produced exopolysaccharides, with heteropolysaccharides yielding less than dextrans from sucrose.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Food Science

Background:

  • Microbial exopolysaccharides (EPS) are crucial in food and industrial applications.
  • Sugar beets are a potential source for novel EPS-producing microorganisms.
  • Understanding EPS production variability is key for biotechnological utilization.

Purpose of the Study:

  • To isolate and characterize slime-producing microorganisms from Finnish sugar beets.
  • To quantify exopolysaccharide production and composition.
  • To identify promising EPS-producing bacterial strains.

Main Methods:

  • Isolation of microorganisms from sugar beet samples.
  • Screening for exopolysaccharide production.
  • Quantification of heteropolysaccharides and dextrans.

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  • Identification of bacterial isolates using standard microbiological techniques.

    • Main Results:

    • Six hundred microorganisms were isolated; 170 produced exopolysaccharides.
    • 35% of the produced exopolysaccharides were heteropolysaccharides.
    • Heteropolysaccharide yield from sucrose was lower compared to dextran yield.
    • Five isolates were identified: Leuconostoc mesenteroides (2), Rahnella aquatilis (2), and Enterobacter amnigenus (1).

    Conclusions:

    • Finnish sugar beets harbor diverse microorganisms capable of exopolysaccharide production.
    • Specific bacterial genera like Leuconostoc, Rahnella, and Enterobacter show potential for EPS biosynthesis.
    • Further research is warranted to optimize heteropolysaccharide yield and explore their applications.