Open AccessCombinatorial Biobleaching of Mixedwood Pulp with Lignolytic and Hemicellulolytic Enzymes for Paper Making
Author(s) -
Steffy Angural,
Monika Rana,
Alisha Sharma,
Rahul Warmoota,
Neena Puri,
Naveen Gupta
Publication year - 2020
Publication title -
indian journal of microbiology/indian journal of microbiology (print)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 46
eISSN - 0973-7715
pISSN - 0046-8991
DOI - 10.1007/s12088-020-00867-6
Subject(s) - kappa number , laccase , xylanase , chemistry , pulp (tooth) , enzyme , pulp and paper industry , food science , microbiology and biotechnology , biochemistry , biology , dentistry , kraft process , engineering , medicine , kraft paper
Microbial enzymes are the safe alternatives to chemical based bleaching of pulp in paper mills. For effective biobleaching, both hemicellulolytic and lignolytic enzymes are required. This study reports laccase (L) + xylanase (X) and laccase (L) + mannanase (M) enzyme concoctions for pulp biobleaching derived from Bacillus sp. LX and Bacillus sp. LM isolated from the decaying organic matter. All enzymes were thermo-alkali-stable, hence were suitable for their application in pulp biobleaching. When a mixture of L + X/L + M was used for mixedwood pulp biobleaching, 46.32/40.25% reduction in kappa number; 13.21/10.01% and 3.36/2.76% improvement in brightness and whiteness was achieved respectively. Moreover, no laccase mediator system was required in the current process. Significant changes in the structure of enzymatically treated pulp were also observed. All these properties make these concoctions of enzymes suitable for their application in pulp and paper mill.