Application of fractional factorial design to levan production by Zymomonas mobilis

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Sucrose utilization by Zymomonas mobilis: formation of a levan.

1. Molar growth-yield coefficients of Zymomonas mobilis for glucose, fructose, glucose plus fructose, and sucrose are reported. Yield coefficients for sucrose are appreciably lower than those for the equivalent concentrations of glucose plus fructose. 2. Only 2.6% of [U-(14)C]glucose supplied in the growth medium is incorporated into cell substance by Z. mobilis utilizing glucose as the energy ...

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Influence of fermentation conditions on levan production by Zymomonas mobilis CT2

Zymomonas mobilis produces two extracellular sucrases namely levansucrase (sac B) and sucrase (sac C). A mutant strain of Z. mobilis CT2 defective in sucrase sac C, constructed earlier by gene disruption, produced higher levels of levan (27.2 g L) than the parent strain B14023 (15.4 g L) from 200 g L of sucrose at 25°C and pH 5.0. Increasing fermentation temperature from 25 to 35°C enhanced eth...

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Production of Acetaldehyde by Zymomonas mobilis.

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Ethanol production by Zymomonas mobilis in fed-batch fermentations.

The production of ethanol by Zymomonas mobilis NRRL B-4286 was studied in fed-batch cultures. Initial percent (w/v) glucose, rate of feed, and quantity of 50%; (w/v) glucose feed were varied. Glucose inhibition of growth rate occurred at concentrations greater than 8% (w/) Feed was begun after 4 h incubation. Feed volume was ca. 36%; of starting batch volume to get ca. 10%; (w/v) ethanol at har...

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It has been reported in literature that Z. mobilis has two types of alcohol dehydrogenase gene (ADH), one is Zinc inducible, and another is Iron (Ferrous) inducible. Therefore, it was attempted to increase the alcohol production by inducing the alcohol dehydrogenase activity by addition of Zinc ions. It was standardized that 10 mM Zinc sulphate addition to alcohol producing broth resulted in ma...

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ژورنال

عنوان ژورنال: Brazilian Journal of Microbiology

سال: 2007

ISSN: 1517-8382

DOI: 10.1590/s1517-83822007000100010