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Thermophilic, lignocellulolytic bacteria for ethanol production: current state and perspectives

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Abstract

Lignocellulosic biomass contains a variety of carbohydrates, and their conversion into ethanol by fermentation requires an efficient microbial platform to achieve high yield, productivity, and final titer of ethanol. In recent years, growing attention has been devoted to the development of cellulolytic and saccharolytic thermophilic bacteria for lignocellulosic ethanol production because of their unique properties. First of all, thermophilic bacteria possess unique cellulolytic and hemicellulolytic systems and are considered as potential sources of highly active and thermostable enzymes for efficient biomass hydrolysis. Secondly, thermophilic bacteria ferment a broad range of carbohydrates into ethanol, and some of them display potential for ethanologenic fermentation at high yield. Thirdly, the establishment of the genetic tools for thermophilic bacteria has allowed metabolic engineering, in particular with emphasis on improving ethanol yield, and this facilitates their employment for ethanol production. Finally, different processes for second-generation ethanol production based on thermophilic bacteria have been proposed with the aim to achieve cost-competitive processes. However, thermophilic bacteria exhibit an inherent low tolerance to ethanol and inhibitors in the pretreated biomass, and this is at present the greatest barrier to their industrial application. Further improvement of the properties of thermophilic bacteria, together with the optimization production processes, is equally important for achieving a realistic industrial ethanol production.

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  1. Microbial Engineering Group, Biosystems Division, Risoe National Laboratory for Sustainable Energy, Technical University of Denmark, Building 330, Frederiksborgvej 399, P.O. Box 49, 4000, Roskilde, Denmark

    Tinghong Chang & Shuo Yao

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  1. Tinghong Chang
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  2. Shuo Yao
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Correspondence to Tinghong Chang.

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Chang, T., Yao, S. Thermophilic, lignocellulolytic bacteria for ethanol production: current state and perspectives. Appl Microbiol Biotechnol 92, 13–27 (2011). https://doi.org/10.1007/s00253-011-3456-3

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  • DOI: https://doi.org/10.1007/s00253-011-3456-3

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