Inhibition of cellulases by impurities in Steam-Exploded wood
A P Sinitsyn1, L S Clesceri, H R Bungay
1Rensselaer Polytechnic Institute, 12181, Troy, New York.
Applied Biochemistry and Biotechnology
|November 16, 2013
Summary
Washing steam-exploded hardwood chips with water removes impurities. This process restores the activity and stability of cellulases, enabling efficient cellulose hydrolysis.
Area of Science:
- Biomass processing
- Enzymology
- Biochemical engineering
Background:
- Steam explosion is a pretreatment method for lignocellulosic biomass.
- Impurities generated during steam explosion can inhibit enzyme activity.
- Cellulases are crucial enzymes for biomass hydrolysis.
Purpose of the Study:
- To investigate the impact of impurities from steam-exploded hardwood chips on cellulase performance.
- To evaluate the effectiveness of water washing in removing these inhibitory substances.
Main Methods:
- Steam explosion of hardwood chips.
- Water washing of the exploded biomass.
- Assessing cellulase activity and stability before and after washing.
- Measuring cellulose hydrolysis yields.
Main Results:
- Steam explosion generated impurities that significantly reduced cellulase activity and stability.
- Water washing effectively removed these inhibitory compounds.
- Hydrolysis yields after washing were comparable to those obtained with purified cellulose.
Conclusions:
- Water washing is a simple and effective method to mitigate the negative effects of steam explosion impurities on cellulase-based biomass hydrolysis.
- Optimizing pretreatment and purification steps can enhance the efficiency of cellulosic ethanol production.
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