Xylose anaerobic conversion by open-mixed cultures |
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Authors: | Margarida F Temudo Tania Mato Robbert Kleerebezem Mark C M van Loosdrecht |
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Institution: | 1.Department of Biotechnology,Delft University of Technology,Delft,The Netherlands;2.Laboratory of Chemical Engineering, Faculty of Sciences,University of A Coru?a,A Coru?a,Spain |
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Abstract: | Xylose is, after glucose, the dominant sugar in agricultural wastes. In anaerobic environments, carbohydrates are converted
into volatile fatty acids and alcohols. These can be used as building blocks in biotechnological or chemical processes, e.g.,
to produce bioplastics. In this study, xylose fermentation by mixed microbial cultures was investigated and compared with
glucose under the same conditions. The product spectrum obtained with both substrates was comparable. It was observed that,
in the case of xylose, a higher fraction of the carbon was converted into catabolic products (butyrate, acetate, and ethanol)
and the biomass yield was approximately 20% lower than on glucose, 0.16 versus 0.21 Cmol X/Cmol S. This lower yield is likely
related to the need of an extra ATP during xylose uptake. When submitted to a pulse of glucose, the population cultivated
on xylose could instantaneously convert the glucose. No substrate preference was observed when glucose and xylose were fed
simultaneously to the continuously operated bioreactor. |
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Keywords: | Xylose Glucose Fermentation Bulk chemicals Hydrogen Mixed microbial population |
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