Fermentação de trealose e glicogênio endógenos em Saccharomyces cerevisiae

Ferreira, Leonel Vasco; Amorim, Henrique Vianna de; Basso, Luiz Carlos

doi:10.1590/s0101-20611999000100008

Cited by 10 publications

(8 citation statements)

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“…Trehalose and glycogen are reserve carbohydrates for additional energy when cells are starved for sugars 44, 45. Moreover, trehalose is a protecting compound to membrane that helps cells to tolerate dehydration and high ethanol concentrations as well as other industrial stressing factors 46, 47.…”

Section: Fermentation: a Living Processmentioning

confidence: 99%

Ethanol production in Brazil: a bridge between science and industry

Lopes

Paulillo

Godoy

et al. 2016

Brazilian Journal of Microbiology

275

153

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In the last 40 years, several scientific and technological advances in microbiology of the fermentation have greatly contributed to evolution of the ethanol industry in Brazil. These contributions have increased our view and comprehension about fermentations in the first and, more recently, second-generation ethanol. Nowadays, new technologies are available to produce ethanol from sugarcane, corn and other feedstocks, reducing the off-season period. Better control of fermentation conditions can reduce the stress conditions for yeast cells and contamination by bacteria and wild yeasts. There are great research opportunities in production processes of the first-generation ethanol regarding high-value added products, cost reduction and selection of new industrial yeast strains that are more robust and customized for each distillery. New technologies have also focused on the reduction of vinasse volumes by increasing the ethanol concentrations in wine during fermentation. Moreover, conversion of sugarcane biomass into fermentable sugars for second-generation ethanol production is a promising alternative to meet future demands of biofuel production in the country. However, building a bridge between science and industry requires investments in research, development and transfer of new technologies to the industry as well as specialized personnel to deal with new technological challenges.

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Section: Fermentation: a Living Processmentioning

confidence: 99%

Ethanol production in Brazil: a bridge between science and industry

Lopes

Paulillo

Godoy

et al. 2016

Brazilian Journal of Microbiology

275

153

View full text Add to dashboard Cite

show abstract

“…This is observed by minerals (N, P, K, Mg) leakage and a decreasing level of yeast cellular trehalose in parallel with cell viability drop (Ferreira et al 1999). Yeast strains that tolerate the stressing conditions of industrial fermentations normally present higher trehalose levels .…”

Section: Acid Stressmentioning

confidence: 99%

“…Fortunately, high levels of carbohydrate reserves are of paramount importance for yeasts to withstand the stressful acid washing treatment, imposed by the industrial process. During treatment, part of the glycogen and trehalose are dissimilated through glycolysis, and ethanol is produced during the acid treatment with no sugar in the medium (Ferreira et al, 1999). At the end of the acid treatment, the levels of these reserves are adequate to guarantee high viability.…”

Section: The Importance Of Yeast Glycogen and Trehalose During Stressmentioning

confidence: 99%

Ethanol Production in Brazil: The Industrial Process and Its Impact on Yeast Fermentation

Basso¹,

Basso²,

Rocha³

2011

Biofuel Production-Recent Developments and Prospects

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“…Contaminating bacteria (with favorable pH 6) are less resistant to lower pH than yeast (favor pH above 4), therefore, a pH drop in the beginning of the fermentation cycle ameliorates issues related to bacterial activity. However, this approach may also deteriorate the yeast's viability and metabolic activity [13,14].…”

Section: Introductionmentioning

confidence: 99%

Removal of Bacterial Contamination from Bioethanol Fermentation System Using Membrane Bioreactor

et al. 2018

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A major issue hindering efficient industrial ethanol fermentation from sugar-based feedstock is excessive unwanted bacterial contamination. In industrial scale fermentation, reaching complete sterility is costly, laborious, and difficult to sustain in long-term operation. A physical selective separation of a co-culture of Saccharomyces cerevisiae and an Enterobacter cloacae complex from a buffer solution and fermentation media at dilution rates of 0.1-1 1/h were examined using an immersed membrane bioreactor (iMBR). The effect of the presence of yeast, inoculum size, membrane pore size, and surface area, backwashing and dilution rate on bacteria removal were assessed by evaluating changes in the filtration conditions, medium turbidity, and concentration of compounds and cell biomass. The results showed that using the iMBR with dilution rate of 0.5 1/h results in successful removal of 93% of contaminating bacteria in the single culture and nearly complete bacteria decontamination in yeast-bacteria co-culture. During continuous fermentation, application of lower permeate fluxes provided a stable filtration of the mixed culture with enhanced bacteria washout. This physical selective separation of bacteria from yeast can enhance final ethanol quality and yields, process profitability, yeast metabolic activity, and decrease downstream processing costs.

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Fermentação de trealose e glicogênio endógenos em Saccharomyces cerevisiae

Cited by 10 publications

References 0 publications

Ethanol production in Brazil: a bridge between science and industry

Ethanol production in Brazil: a bridge between science and industry

Ethanol Production in Brazil: The Industrial Process and Its Impact on Yeast Fermentation

Removal of Bacterial Contamination from Bioethanol Fermentation System Using Membrane Bioreactor

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