Agricultural and Biosystems Engineering Publications

Document Type

Article

Publication Date

2008

Journal or Book Title

Biotechnology for Biofuels

Volume

1

First Page

17

Research Focus Area(s)

Biological and Process Engineering and Technology

DOI

10.1186/1754-6834-1-17

Abstract

Background: The availability and low cost of lignocellulosic biomass has caused tremendous interest in the bioconversion of this feedstock into liquid fuels. One measure of the economic viability of the bioconversion process is the ease with which a particular feedstock is hydrolyzed and fermented. Because monitoring the analytes in hydrolysis and fermentation experiments is time consuming, the objective of this study was to develop a rapid fluorescence-based method to monitor sugar production during biomass hydrolysis, and to demonstrate its application in monitoring corn stover hydrolysis.

Results: Hydrolytic enzymes were used in conjunction with Escherichia coli strain CA8404 (a hexose and pentose-consuming strain), modified to produce green fluorescent protein (GFP). The combination of hydrolytic enzymes and a sugar-consuming organism minimizes feedback inhibition of the hydrolytic enzymes. We observed that culture growth rate as measured by change in culture turbidity is proportional to GFP fluorescence and total growth and growth rate depends upon how much sugar is present at inoculation. Furthermore, it was possible to monitor the course of enzymatic hydrolysis in near real-time, though there are instrumentation challenges in doing this.

Conclusion: We found that instantaneous fluorescence is proportional to the bacterial growth rate. As growth rate is limited by the availability of sugar, the integral of fluorescence is proportional to the amount of sugar consumed by the microbe. We demonstrate that corn stover varieties can be differentiated based on sugar yields in enzymatic hydrolysis reactions using posthydrolysis fluorescence measurements. Also, it may be possible to monitor fluorescence in realtime during hydrolysis to compare different hydrolysis protocols.

Comments

This article is from Biotechnology for Biofuels, 1 (2008): 17, doi:10.1186/1754-6834-1-17.

Copyright Owner

The authors

Language

en

Date Available

2012-12-07

File Format

application/pdf

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