Ethanol fermentation promoted by delignified cellulosic material

Iconomou, L.; Psarianos, Costas; Κουτίνας, Αθανάσιος Α.

doi:10.1016/0922-338x(95)90621-6

Cited by 30 publications

(19 citation statements)

References 11 publications

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“…A similar catalytic effect was observed when DC material was used in the alcoholic fermentation (17). As a consequence, the high increase of productivity will sharply decrease production cost.…”

supporting

confidence: 63%

Food Additive Lactic Acid Production by Immobilized Cells of Lactobacillus brevis on Delignified Cellulosic Material

Elezi

Kourkoutas²,

Κουτίνας³

et al. 2003

J. Agric. Food Chem.

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Improvements in yield and productivity in lactic acid fermentation by Lactobaccilus brevis cells immobilized on delignified cellulosic (DC) material are reported. The system proved to be more efficient in comparison with the work reported by other workers. Yields of 80 and 100% conversion using glucose were obtained at 30 degrees C in 1 day of fermentation time. Lactic acid fermentation using whey as substrate was obtained at 30 degrees C in 1-1.5 days, resulting in 70% yield, whereas the remaining lactose in whey was converted to alcohol byproduct, leading to a 90% lactose exploitation and 100% conversion. Cell immobilization of L. brevis on DC material was proved by its reuses in repeated batch fermentations and through electron microscopy. A series of 10 repeated batch fermentations without any loss in cell activity showed a tendency for high operational stability. The presence of DC material resulted in a drastic drop of the fermentation time from 48 to 13 h.

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supporting

confidence: 63%

Food Additive Lactic Acid Production by Immobilized Cells of Lactobacillus brevis on Delignified Cellulosic Material

Elezi

Kourkoutas²,

Κουτίνας³

et al. 2003

J. Agric. Food Chem.

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“…Enhancement of the alcoholic fermentation of molasses by delignified cellulosic material has been exhibited [6] . This observation motivated further research to examine the physicochemical structure of delignified cellulosic material and correlate it with its promotional effect on the rate of alcoholic fermentation.…”

Section: Resultsmentioning

confidence: 99%

“…This material has been successfully used as support for cell immobilization [4] . The produced biocatalyst was used for extremely low temperature fermentations in order to improve the quality of the products [5] , and it was found able to promote the alcoholic fermentation of molasses [6] .…”

Section: Introductionmentioning

confidence: 99%

Nano-Tubular Cellulose for Bioprocess Technology Development

et al. 2012

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Delignified cellulosic material has shown a significant promotional effect on the alcoholic fermentation as yeast immobilization support. However, its potential for further biotechnological development is unexploited. This study reports the characterization of this tubular/porous cellulosic material, which was done by SEM, porosimetry and X-ray powder diffractometry. The results showed that the structure of nano-tubular cellulose (NC) justifies its suitability for use in “cold pasteurization” processes and its promoting activity in bioprocessing (fermentation). The last was explained by a glucose pump theory. Also, it was demonstrated that crystallization of viscous invert sugar solutions during freeze drying could not be otherwise achieved unless NC was present. This effect as well as the feasibility of extremely low temperature fermentation are due to reduction of the activation energy, and have facilitated the development of technologies such as wine fermentations at home scale (in a domestic refrigerator). Moreover, NC may lead to new perspectives in research such as the development of new composites, templates for cylindrical nano-particles, etc.

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“…The idea was based on the observation that, since cells immobilized on delignified materials are more alcohol-resistant [16] and cryotolerant [4] compared with free cells, they would also be tolerant when subjected to high temperatures. The hightemperature dried biocatalysts were used in the same manner as described above to ferment glucose media for the evaluation of their fermentation activity.…”

Section: Volatile By Productsmentioning

confidence: 99%

Fermentation Efficiency of Cells Immobilized on Delignified Brewers' Spent Grains after Low- and High-Temperature Thin Layer Thermal Drying

Tsaousi

Κουτίνας

Bekatorou

et al. 2009

Appl Biochem Biotechnol

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Low-cost dried yeasts immobilized on delignified brewers' spent grains for use in wine making and brewing were produced by simple thermal drying techniques. To optimize the thermal drying process, vacuum and air stream conditions were examined. Drying of thin layers of the biocatalysts was performed at low (30-38 degrees C) and high temperatures (40-70 degrees C). The fermentation efficiency of the thermally dried biocatalysts was acceptable, with immobilized cells showing a significantly higher thermotolerance compared with free cells. Immobilized cells dried at high temperatures presented slightly improved glucose fermentation efficiency compared with the low-temperature dried biocatalysts. Gas chromatography-mass spectrometry analysis of aroma volatiles of the fermented products revealed an increase of esters, lower higher alcohol formation, and significantly lower concentration of carbonylic compounds.

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Ethanol fermentation promoted by delignified cellulosic material

Cited by 30 publications

References 11 publications

Food Additive Lactic Acid Production by Immobilized Cells of Lactobacillus brevis on Delignified Cellulosic Material

Food Additive Lactic Acid Production by Immobilized Cells of Lactobacillus brevis on Delignified Cellulosic Material

Nano-Tubular Cellulose for Bioprocess Technology Development

Fermentation Efficiency of Cells Immobilized on Delignified Brewers' Spent Grains after Low- and High-Temperature Thin Layer Thermal Drying

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