Shifting product formation from xylitol to ethanol in pentose fermentations using Candida tropicalis by adding polyethylene glycol (PEG)

Hahn‐Hägerdal, Bärbel; Jönsson, Birgitta Rees; Lohmeier-Vogel, Elke M.

doi:10.1007/bf00295114

Cited by 23 publications

(7 citation statements)

References 7 publications

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“…Further, metabolic-level studies are needed to discover the mechanisms of ethanol and xylitol production using C. tropicalis and the relationship between oxygen requirement and product formation. It has also been reported that glucose repression and optimum NADPH/NADP and NADH/NAD ratios are important for xylitol production using C. tropicalis ATCC13803 [38]. It is clear from Fig.…”

Section: Hydrolysate Fermentationmentioning

confidence: 75%

“…However, during continuous hydrolysis by cellulolytic enzymes, liquefaction of the pretreated solid residue resulted in release of sugars into the fermentation medium. Low water activity at initial stages also retards xylitol production from xylose during mixed-sugar fermentation by C. tropicalis [38]. Production of glycerol and xylitol along with ethanol has been reported previously by researchers using M. indicus and S. cerevisiae during fermentation of rice straw hydrolysate [13,16].…”

Section: Time (H)mentioning

confidence: 78%

“…Different hypothesis have been proposed for the oxygen requirement during ethanol production using C. tropicalis. Hahn-Hagerdal et al [38] reported that Candida sp generally metabolizes pentoses under aerobic conditions and that ethanol production takes place only under oxygen-limited conditions. But, it also has been reported that ethanol production accelerates at increased aeration levels [20].…”

Section: Hydrolysate Fermentationmentioning

confidence: 98%

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Enhanced ethanol production via fermentation of rice straw with hydrolysate-adapted Candida tropicalis ATCC 13803

Oberoi

Vadlani

Brijwani

et al. 2010

Process Biochemistry

102

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Section: Hydrolysate Fermentationmentioning

confidence: 75%

Section: Time (H)mentioning

confidence: 78%

Section: Hydrolysate Fermentationmentioning

confidence: 98%

See 1 more Smart Citation

Enhanced ethanol production via fermentation of rice straw with hydrolysate-adapted Candida tropicalis ATCC 13803

Oberoi

Vadlani

Brijwani

et al. 2010

Process Biochemistry

102

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“…It was postulated that mycelia can metabolize alginate with glycolytic enzymes. Hahn-Hagerdal et al (1985) demonstrated that some water-soluble polymers such as dextran and polyethylene glycol enhanced ethanol production with yeast by modifying the cell membrane. Alginate or the other immobilizing polymers may similarly affect cell physiology.…”

Section: Effect Of Soluble Components Of the Matrixmentioning

confidence: 98%

Immobilization of Cells for Application in the Food Industry

Groboillot

Boadi

Poncelet

et al. 1994

Critical Reviews in Biotechnology

167

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Immobilization of cells offers advantages to the food process industries, including enhanced fermentation productivity and cell stability and reduced downstream processing costs due to facilitated cell recovery and recycle. This article summarizes the varied immobilization methodologies, including adsorption, entrapment, covalent binding, and microencapsulation. Examples of interest to the food industry are provided, together with a review of the physiological effects of immobilization. Topics in process engineering include immobilized cell bioreactor configurations and the scale-up potential of the various immobilization techniques.

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“…The ethanol yield has been improved by the addition to the medium of fatty acids (27), polyethylene glycol (28), azide (29), or acetone (30).…”

Section: Pathwaysmentioning

confidence: 99%

Metabolism of Xylose and Xylitol by Pachysolen tannophilus

1994

ACS Symposium Series

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The conversion of both xylose and xylitol to ethanol has been demonstrated in cell-free extracts of Pachysolen tannophilus. The facts that xylitol is metabolized in the extracts but not in whole cells in the absence of nystatin demonstrate that transport across the cell membrane limits its metabolism in whole cells. The metabolism of both xylose and xylitol requires NAD and ADP, but the metabolism of xylose requires and NADPH-generating system in addition. Xylose isomerase increases the rate of ethanol formation from xylose, but some xylitol accumulates nevertheless. Therefore, the cell-free system metabolizes xylose as two independent, sequential pathways, one to synthesize xylitol and one to convert it to ethanol. The consequences for process -improvement strategies are discussed.With the increased awareness of the limitations in the world supplies of petroleum came an increased interest in gasoline extenders and additives. The oxygenated additives tert-butyl ether, methanol and ethanol were found to have the additional advantages of octane enhancement and lower rates of air pollution. The use of ethanol on a national scale is associated with further advantages (1,2): the security of fuel sources; a more favorable foreign trade balance; and the renewability of the raw materials for production. Although ethanol can be produced either from a petroleum component or by fermentation, the latter source is the only one associated with all of the advantages above. The most attractive raw materials for ethanol fermentation are cane sugar, corn sugar, and sugar derived from wood and crop residues (lignocellulosic materials). In this country cane sugar is too expensive to be a source of fuel ethanol and com ($98-$104 per ton) (2), can be competitive only in special circumstances, such as government subsidy. However, lignocellulosic material ($20-$70 per ton) could be competitive, if the technical limitations associated with processing and fermentation could be overcome. Although the approximate price of

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Shifting product formation from xylitol to ethanol in pentose fermentations using Candida tropicalis by adding polyethylene glycol (PEG)

Cited by 23 publications

References 7 publications

Enhanced ethanol production via fermentation of rice straw with hydrolysate-adapted Candida tropicalis ATCC 13803

Enhanced ethanol production via fermentation of rice straw with hydrolysate-adapted Candida tropicalis ATCC 13803

Immobilization of Cells for Application in the Food Industry

Metabolism of Xylose and Xylitol by Pachysolen tannophilus

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