Ethanol production by a mixed culture of flocculent strains of Zymomonas mobilis and Saccharomyces sp.

1996 ◽  
Vol 45 (5) ◽  
pp. 580-583 ◽  
Author(s):  
C. Abate ◽  
D. Callieri ◽  
Emilio Rodríguez ◽  
Oscar Garro
Keyword(s):  
Ethanol Production ◽  
Mixed Culture ◽  
Zymomonas Mobilis

scholarly journals Comparative Study of Ethanol Production from Cassava Pulp by a Mixed Culture of Amylomyces Rouxii with Zygosaccharomyces Pseudorouxii and Zymomonas Mobilis

2019 ◽  
Vol 12 (1) ◽  
pp. 199-210
Author(s):  
Thalisa Yuwa-Amornpitak ◽  
Pa-Nga Yeunyaw
Keyword(s):  
Comparative Study ◽  
Ethanol Production ◽  
Mixed Culture ◽  
Zymomonas Mobilis ◽  
Ethanol Concentration ◽  
Polynomial Equation ◽  
Cassava Pulp ◽  
Optimum Parameters ◽  
Reduced Viscosity ◽  
Order Polynomial

In order to develop a procedure for production bioethanol from cassava pulp, mixed culture of Amylomyces rouxii TISTR 3667 with Zygosaccharomyces pseudorouxii TISTR 5966 or Zymomonas mobilis TISTR 550 and cellulase were evaluated. The parameters such as pH, cellulase, and cassava pulp concentration that influence on the amount of fermentable sugar were optimized by response surface methodology (RSM). Ethanol production was observed and compared to the predicted value that was calculated from the models. The models were fitted to a second-order polynomial equation. They were used to predict ethanol concentration from the use of the mixed culture of A. rouxii TISTR 3667 and Z. mobilis TISTR 550 (G2) that was higher than the amount produced using the mixed culture of A. rouxii TISTR 3667 and Zygosaccharomyces pseudorouxii TISTR 5966 (G1). The following optimum parameters were obtained: pH 6, 20% cassava pulp, and 1% cellulase for G2; and pH 4, 20% cassava pulp, and 0.55% cellulase for G1. The effect of cellulase on ethanol production, a comparative study was conducted in the fermenter by using mixed culture of A. rouxii TISTR 3667 and Z. mobilis TISTR 550. It was showed that more 15% ethanol was gained from 10% cassava pulp with 0.5% cellulase (25 g/l ethanol) compared to the system without cellulase (20 g/l). Mathematically model (equation 4) predicted the ethanol in this system near the actual value of 26.87 g/l. This study indicated that RSM is a powerful tool for optimization fermentation process by using mixed culture including cellulase. Besides these cellulase also reduced viscosity of the cassava medium and enhanced ethanol production. However this process should be more continue to study.

scholarly journals The Quorum Sensing Auto-Inducer 2 (AI-2) Stimulates Nitrogen Fixation and Favors Ethanol Production over Biomass Accumulation in Zymomonas mobilis

2021 ◽  
Vol 22 (11) ◽  
pp. 5628
Author(s):  
Valquíria Campos Alencar ◽  
Juliana de Fátima dos Santos Silva ◽  
Renata Ozelami Vilas Boas ◽  
Vinícius Manganaro Farnézio ◽  
Yara N. L. F. de Maria ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Quorum Sensing ◽  
Ethanol Production ◽  
N2 Fixation ◽  
Energy Demand ◽  
Zymomonas Mobilis ◽  
Biomass Accumulation ◽  
High Energy ◽  
Gram Negative ◽  
Expression Of Genes

Autoinducer 2 (or AI-2) is one of the molecules used by bacteria to trigger the Quorum Sensing (QS) response, which activates expression of genes involved in a series of alternative mechanisms, when cells reach high population densities (including bioluminescence, motility, biofilm formation, stress resistance, and production of public goods, or pathogenicity factors, among others). Contrary to most autoinducers, AI-2 can induce QS responses in both Gram-negative and Gram-positive bacteria, and has been suggested to constitute a trans-specific system of bacterial communication, capable of affecting even bacteria that cannot produce this autoinducer. In this work, we demonstrate that the ethanologenic Gram-negative bacterium Zymomonas mobilis (a non-AI-2 producer) responds to exogenous AI-2 by modulating expression of genes involved in mechanisms typically associated with QS in other bacteria, such as motility, DNA repair, and nitrogen fixation. Interestingly, the metabolism of AI-2-induced Z. mobilis cells seems to favor ethanol production over biomass accumulation, probably as an adaptation to the high-energy demand of N2 fixation. This opens the possibility of employing AI-2 during the industrial production of second-generation ethanol, as a way to boost N2 fixation by these bacteria, which could reduce costs associated with the use of nitrogen-based fertilizers, without compromising ethanol production in industrial plants.

scholarly journals Ethanol Production from Glucose and Xylose by Immobilized Zymomonas mobilis CP4(pZB5)

2000 ◽  
Vol 84-86 (1-9) ◽  
pp. 525-542 ◽  
Author(s):  
Mahesh S. Krishnan ◽  
Maria Blanco ◽  
Christopher K. Shattuck ◽  
Nhuan P. Nghiem ◽  
Brian H. Davison
Keyword(s):  
Ethanol Production ◽  
Zymomonas Mobilis

scholarly journals Ethanol production from Jerusalem artichoke (Helianthus tuberosus L.) by Zymomonas mobilis TISTR548

2011 ◽  
Vol 10 (52) ◽  
pp. 10691-10697 ◽  
Author(s):  
Thanonkeo Pornthap ◽  
Thanonkeo Sudarat ◽  
Charoensuk Kannikar ◽  
Yamada Mamoru
Keyword(s):  
Ethanol Production ◽  
Zymomonas Mobilis ◽  
Jerusalem Artichoke ◽  
Helianthus Tuberosus

Continuous ethanol production at high glucose concentrations by a passively immobilized Zymomonas mobilis system

1989 ◽  
Vol 31 (3) ◽  
Author(s):  
MariaR. Castellar ◽  
Francisco Borrego ◽  
Manuel C�novas ◽  
Arturo Manj�n ◽  
Jos�L. Iborra
Keyword(s):  
Ethanol Production ◽  
High Glucose ◽  
Zymomonas Mobilis
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