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Food Technology and Biotechnology, Vol. 40 No. 4, 2002.

Original scientific paper

Stillage as a Source of Growth Promoting Biofactors and a Stimulator of Levan and Extracellular Levansucrase Synthesis for Zymomonas mobilis

Martins Bekers ; Institute of Microbiology and Biotechnology, University of Latvia, Kronvalda blvd. 4, LV-1586 Riga, Latvia
Mara Grube ; Institute of Microbiology and Biotechnology, University of Latvia, Kronvalda blvd. 4, LV-1586 Riga, Latvia
Livija Vulfa ; Faculty of Biology, University of Latvia, Kronvalda blvd. 4, LV-1586 Riga, Latvia
Dagnija Upite ; Institute of Microbiology and Biotechnology, University of Latvia, Kronvalda blvd. 4, LV-1586 Riga, Latvia
Elena Kaminska ; Institute of Microbiology and Biotechnology, University of Latvia, Kronvalda blvd. 4, LV-1586 Riga, Latvia
Rita Scherbaka ; Institute of Microbiology and Biotechnology, University of Latvia, Kronvalda blvd. 4, LV-1586 Riga, Latvia
Armands Vigants ; Institute of Microbiology and Biotechnology, University of Latvia, Kronvalda blvd. 4, LV-1586 Riga, Latvia
Aleksejs Danilevich ; Institute of Microbiology and Biotechnology, University of Latvia, Kronvalda blvd. 4, LV-1586 Riga, Latvia

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Abstract

In the present work, the fermentation of simultaneous production of ethanol and levan by Zymomonas mobilis grown on different growth media has been studied. Yeast extract, rye stillage or sugar beet molasses stillage were used as additives to the basic sucrose media and the chemical composition, including vitamins, of the cultivation liquids have been determined. It has been shown that 0.5 % of yeast extract dry weight additive could be substituted by 10.0 % of native stillage additive. It was established that molasses stillage stimulates the ethanol synthesis, but rye stillage additive is more preferable for levan production. The extracellular levansucrase obtained from the culture liquid resulted in similar fructooligosaccharide-producing activities using all the above-mentioned media additives.

Keywords

Zymomonas mobilis; stillage media; vitamins; ethanol; levan; levansucrase

Hrčak ID:

178554

URI

https://hrcak.srce.hr/178554

Publication date:

12.12.2002.

Article data in other languages: croatian

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