Continuous ethanol production from sugar beet molasses using an osmotolerant mutant strain of Zymomonas mobilis

Park, Soon Chul; Baratti, J.

doi:10.1016/0922-338x(92)90224-i

Journal of Fermentation and Bioengineering

1992

DOI: 10.1016/0922-338x(92)90224-i

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Continuous ethanol production from sugar beet molasses using an osmotolerant mutant strain of Zymomonas mobilis

Soon Chul Park

J. Baratti

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Cited by 5 publications

References 16 publications

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Modelling of ethanol production by Saccharomyces cerevisiae from a glucose and maltose mixture

Lee

Chang

et al. 1995

Biotechnol Lett

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A model for ethanol production from a glucose-maltose mixture has been proposed, which includes a term representing the glucose repression effect on maltose consumption. The model parameters were estimated from batch experimental data. Results of sensitivity analysis on the Monod constants for glucose and maltose, and the repression constant, showed that +10% changes in these three paraineters caused no significant effect on data fitting.

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Modelling of ethanol production by Saccharomyces cerevisiae from a glucose and maltose mixture

Lee

Chang

et al. 1995

Biotechnol Lett

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Effects of potassium chloride on ethanol production by an osmotolerant mutant of Zymomonas mobilis

Park

Baratti

1993

Appl Microbiol Biotechnol

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Continuous production of l (+)-lactic acid by Lactobacillus casei in two-stage systems

Bruno-Bárcena

Ragout

Córdoba

et al. 1999

Applied Microbiology and Biotechnology

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A two-stage two-stream chemostat system and a two-stage two-stream immobilized upflow packed-bed reactor system were used for the study of lactic acid production by Lactobacillus casei subsp casei. A mixing ratio of D12/D2 = 0.5 (D = dilution rate) resulted in optimum production, making it possible to generate continuously a broth with high lactic acid concentration (48 g l-1) and with a lowered overall content of initial yeast extract (5 g l-1), half the concentration supplied in the one-step process. In the two-stage chemostat system, with the first stage at pH 5.5 and 37 degrees C and a second stage at pH 6.0, a temperature change from 40 degrees C to 45 degrees C in the second stage resulted in a 100% substrate consumption at an overall dilution rate of 0.05 h-1. To increase the cell mass in the system, an adhesive strain of L. casei was used to inoculate two packed-bed reactors, which operated with two mixed feedstock streams at the optimal conditions found above. Lactic acid fermentation started after a lag period of cell growth over foam glass particles. No significant amount of free cells, compared with those adhering to the glass foam, was observed during continuous lactic acid production. The extreme values, 57.5 g l-1 for lactic acid concentration and 9.72 g l-1 h-1 for the volumetric productivity, in upflow packed-bed reactors were higher than those obtained for free cells (48 g l-1 and 2.42 g l-1 h-1) respectively and the highest overall L(+)-lactic acid purity (96.8%) was obtained in the two-chemostat system as compared with the immobilized-cell reactors (93%).

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Continuous ethanol production from sugar beet molasses using an osmotolerant mutant strain of Zymomonas mobilis

Cited by 5 publications

References 16 publications

Modelling of ethanol production by Saccharomyces cerevisiae from a glucose and maltose mixture

Modelling of ethanol production by Saccharomyces cerevisiae from a glucose and maltose mixture

Effects of potassium chloride on ethanol production by an osmotolerant mutant of Zymomonas mobilis

Continuous production of l (+)-lactic acid by Lactobacillus casei in two-stage systems

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