Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 86, Issue -, Pages 288-295Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2016.01.079
Keywords
Chitosan; Dye discoloration; Entrapment; Immobilization; Laccase; Papaya
Funding
- University Grants Commission, New Delhi, India
- Department of Higher Education, Govt. of Uttar Pradesh, India under Centre of Excellence in Bioinformatics, Department of Biotechnology, Govt. of India, New Delhi under BIF Scheme
- Department of Science and Technology, New Delhi under Promotion of University Research and Scientific Excellence (DST-PURSE) programe
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A purified papaya laccase was immobilized in chitosan beads using entrapment approach and its physicochemical properties were investigated and compared with that of free enzyme. Increase in properties of the laccase such as optimum temperature (by 10 degrees C), thermostability (by 3-folds) and optimum pH (from 8.0 to 10.0) was observed after immobilization. Immobilization led to increased tolerance of enzyme to a number of metal ions (including heavy metals) and organic solvents namely, ethanol, isopropanol, methanol, benzene and DMF. The catalytic efficiency (K-cat/K-m) of the immobilized enzyme was found to increase more than ten folds, in comparison to that of the free enzyme, with hydroquinone as substrate. Immobilization of laccase also led to improvement in dye decolorization such that the synthetic dye indigo carmine (50 mu g/ml) was completely decolorized within 8 h of incubation as compared to that of the free laccase which decolorized the same dye to only 56% under similar conditions. Thus, immobilization of laccase into chitosan beads led to tremendous improvement in various useful attributes of this enzyme thereby making it more versatile for its industrial exploitation. (C) 2016 Elsevier B.V. All rights reserved.
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