Abstract
The white rot fungus Phanerochaete chrysosporium is well known for its ability to degrade toxic pollutants owing to its efficient extracellular ligninase system. However, biomass growth and enzyme secretion in presence of toxic pollutant is not well understood. In the present study, using the model azo dye Direct Red-80, biomass growth and lignin peroxidase secretion by the fungus was studied during its degradation and a stochastic based model was applied to simulate the behavior of the fungus. Also, glucose concentration in the medium was varied in order to observe its effect on the dye degradation. Results revealed that glucose at an optimum concentration of 10 gL-1 is essential for biomass growth, LiP secretion, as well as the dye decolourization. Modeling the behavior of the fungus with the presence of both glucose and dye has shown significant similarity.
Highlights
Industrial wastes are the main source of toxic pollutants in the environment mainly due to lack of proper treatment and discharge of such wastes
In the present study, using the model azo dye Direct Red-80, biomass growth and lignin peroxidase secretion by the fungus was studied during its degradation and a stochastic based model was applied to simulate the behavior of the fungus
The white-rot fungus Phanerochaete chrysosporium, which belongs to a group of lignin-degrading basidiomycetes, has received considerable attention in the past for their bioremediation potential [5,6,7] owing to its natural capability to degrade complex lignin using extracellular non-specific and non-stereo selective enzyme system composed of lignin peroxidases (LiP, EC 1.11. 1.14), laccases (EC1.10.3.2), and manganese peroxidases (MnP, EC 1.11.1.13)
Summary
Industrial wastes are the main source of toxic pollutants in the environment mainly due to lack of proper treatment and discharge of such wastes. In order to further establish the potential of the organism for environmental remediation purpose it is necessary to understand and model the biomass growth and enzyme secretion by the fungus in presence of such toxic pollutants. The present study was aimed at investigating the effects of DR-80, a toxic azo dye widely used in modern textile and dyeing industries, on these two aspects of the fungus. Since media is known to play a vital role on growth of the fungus and biodegradation of the dye [9], effects of media constituents, mainly glucose concentration, on dye degradation were observed and modeled in the study
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