The 3rd International Conference on New Energy and Future Energy System
August 21st - 24th, 2018, Shanghai, China
Prof. Shijie Liu

Professor and Associate Chair
Department of Paper and Bioprocess Engineering
State University of New York
New York, USA

Keynote speech title: Ethanol Fermentation of Mixed Sugars from Woody Biomass
Abstract: Woody biomass has becoming an attractive source of renewable energy and materials. Woody biomass is heterogeneous containing carbohydrates and aromatics. While glucose is the most preferred substrate for bioconversion, polymers of multiple sugars are found in woody biomass. Hot-water extraction of woodchips is a beneficial technique to pretreat woody biomass prior to its conversion to valuable products in a biorefinery. Hot water wood extract contains a mixture of sugars: xylose, glucose, galactose, mannose, arabinose and rhamnose, and their polymers. Five carbon sugars, for example, fetch a premium value over glucose. However, the sugar mixture as it is presents a challenge in fermentation to ethanol and other materials, chemicals, and / or biofuel. There is a preference of the sugars when a sugar mixture is presented to most microorganisms. The fermentation efficiency is especially low for xylose. When genetically modified E. coli fbr5 was employed to ferment the sugar mixture to ethanol, glucose was the first sugar consumed, and then galactose, arabinose, mannose and rhamnose, xylose was the last to be consumed. While E. coli fbr 5 was genetically engineered to ferment Xylose, this outcome is disappointing. Most microorganisms prefer glucose, E coli is no exception. Xylose is the least preferred sugar On the other hand, xylose can be employed to produce xylitol, furfural, and a lot more products efficiently. The value of xylose is higher than glucose on the market, and yet it is limiting the efficiency in biomass conversion. It is possible to leave xylose unconverted and separated from the fermentation broth, while improving fermentation efficiency.

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The 3rd International Conference on New Energy and Future Energy System
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