Journal
BIOPROCESS AND BIOSYSTEMS ENGINEERING
Volume 43, Issue 12, Pages 2219-2229Publisher
SPRINGER
DOI: 10.1007/s00449-020-02407-4
Keywords
Biobleaching; Laccase; Mannanase; Pulp; Xylanase
Funding
- University Grant Commission [UGC-MRP-43-476/2014/SR]
- (UGC-SAP II-DRS-I) New Delhi, India
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Bioprocessing of pulp requires lignolytic as well as hemicellulolytic enzymes. The present study is the first report of a cocktail of laccase (L), xylanase (X), and mannanase (M), from a single bacterium for pulp biobleaching. A novel strainBacillus tequilensisLXM 55 produced thermo-alkali stable L + X + M. On optimization higher enzyme yield (IUml(-1)/fold increase) of laccase (396.35/24.16), xylanase (212.95/81.90) and mannanase (153.33/102.90) were achieved in the cocktail. Treatment of pulp with cocktail of enzymes led to 49.35% reduction in kappa number and considerable enhancement in the brightness (11.59%), whiteness (4.11%), and other pulp properties. Most importantly, no mediator system was required for the application of laccase. 40% less chlorine consumption was required to obtain the paper of the same quality as that of pulp treated without enzyme but with 100% chlorine. Therefore, this cocktail of enzymes is highly suitable for pulp biobleaching in the paper mill.
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