Document Detail

Production of xylanases by mangrove fungi from the Philippines and their application in enzymatic pretreatment of recycled paper pulps.
MedLine Citation:
PMID:  23208600     Owner:  NLM     Status:  Publisher    
Mangrove fungi are vastly unexplored for enzymes with industrial application. This study aimed to assess the biocatalytic activity of mangrove fungal xylanases on recycled paper pulp. Forty-four mangrove fungal (MF) isolates were initially screened for xylanolytic activity in minimal medium with corn cob xylan as the sole carbon source. Eight MF were further cultivated under submerged fermentation for the production of crude xylanases. These crude enzymes were then characterized and tested for the pretreatment of recycled paper pulps. Results showed that 93 % of the tested MF isolates exhibited xylanolytic activity in solid medium. In submerged fermentation, salinity improved the growth of the fungal isolates but did not influence xylanase production. The crude xylanases were mostly optimally active at 50 °C and pH 7. Changes in pH had a greater effect on xylanase stability than temperature. More than half of the activity was lost at pH 9 for majority of the crude enzymes. However, two thermophilic xylanases from Fusarium sp. KAWIT-A and Aureobasidium sp. 2LIPA-M and one alkaliphilic xylanase from Phomopsis sp. MACA-J were also produced. All crude enzymes exhibited cellulase activities ranging from 4 to 21 U/ml. Enzymatic pretreatment of recycled paper pulps with 5 % consistency produced 70-650 mg of reducing sugars per gram of pulp at 50 °C after 60 min. The release of high amounts of reducing sugars showed the potential of mangrove fungal crude xylanases in the local paper and pulp industry. The diverse properties shown by the tested crude enzymes also indicate its potential applications to other enzyme-requiring industries.
Jeremy Martin O Torres; Thomas Edison E Dela Cruz
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-4
Journal Detail:
Title:  World journal of microbiology & biotechnology     Volume:  -     ISSN:  1573-0972     ISO Abbreviation:  World J. Microbiol. Biotechnol.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9012472     Medline TA:  World J Microbiol Biotechnol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
The Graduate School and Research Center for the Natural and Applied Sciences, University of Santo Tomas, España, 1015, Manila, Philippines,
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