Abstract:
:Critical cellulase and hemicellulase activities are identified for hydrolysis of ionic liquid (IL) pretreated poplar and switchgrass; hemicellulase rich substrates with largely amorphous cellulose. Enzymes from Aspergillus nidulans were expressed and purified: an endoglucanase (EG) a cellobiohydrolase (CBH), an endoxylanase (EX) and an acetylxylan esterase (AXE). β-Xylosidase (βX) from Selenomonas ruminantium and a commercial β-glucosidase (βG) from Novozyme 188 were admixed with the A. nidulans enzymes. Statistical analysis indicates that βG and βX activities are significant for both glucose and xylose yields for the two substrates. EG is a significant factor for glucan hydrolysis while EX is significant for xylan hydrolysis of the substrates. The CBH, which has activity on crystalline cellulose and negligible activity on amorphous cellulose, was not a significant factor in glucan hydrolysis. EX is significant in glucan hydrolysis for poplar. The addition of AXE significantly improves xylan hydrolysis for poplar but not switchgrass.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Barr CJ,Mertens JA,Schall CAdoi
10.1016/j.biortech.2011.10.101subject
Has Abstractpub_date
2012-01-01 00:00:00pages
480-5eissn
0960-8524issn
1873-2976pii
S0960-8524(11)01590-2journal_volume
104pub_type
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