Abstract
Optimal enzyme mixtures of six Trichoderma reesei enzymes and five thermostable enzyme components were developed for the hydrolysis of hydrothermally pretreated wheat straw, alkaline oxidised sugar cane bagasse and steam-exploded bagasse by statistically designed experiments. Preliminary studies to narrow down the optimization parameters showed that a cellobiohydrolase/endoglucanase (CBH/EG) ratio of 4:1 or higher of thermostable enzymes gave the maximal CBH-EG synergy in the hydrolysis of hydrothermally pretreated wheat straw. The composition of optimal enzyme mixtures depended clearly on the substrate and on the enzyme system studied. The optimal enzyme mixture of thermostable enzymes was dominated by Cel7A and required a relatively high amount of xylanase, whereas with T. reesei enzymes, the high proportion of Cel7B appeared to provide the required xylanase activity. The main effect of the pretreatment method was that the required proportion of xylanase was higher and the proportion of Cel7A lower in the optimized mixture for hydrolysis of alkaline oxidised bagasse than steam-exploded bagasse. In prolonged hydrolyses, less Cel7A was generally required in the optimal mixture. Five-component mixtures of thermostable enzymes showed comparable hydrolysis yields to those of commercial enzyme mixtures.
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Acknowledgments
Financial support of the EU 7th framework program project HYPE grant number 213139 and the Finnish Funding Agency for Technology and Innovation (Tekes) Biorefine program project SugarTech is gratefully acknowledged. The authors thank Jari Leino and Juha Kaunisto for carrying out the steam explosion and alkaline oxidation pretreatments, Markku Saloheimo for providing T. reesei supernatant with CtCel6A enzyme and Roosa Luode, Ulla Vornamo and Jenni Lehtonen for carrying out the hydrolysis experiments.
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Kallioinen, A., Puranen, T. & Siika-aho, M. Mixtures of Thermostable Enzymes Show High Performance in Biomass Saccharification. Appl Biochem Biotechnol 173, 1038–1056 (2014). https://doi.org/10.1007/s12010-014-0893-3
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DOI: https://doi.org/10.1007/s12010-014-0893-3