Bioremoval and Detoxification of Anthracene by a Halophilic Laccase from Alkalibacillus salilacus

Document Type : Research Paper

Authors

1 School of Chemical Engineering, College of Engineering, University of Tehran, Tehran 14176, Islamic Republic of Iran

2 Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences, P.O. Box 14155–6451, Tehran 1417614411, Islamic Republic of Iran

3 University of Tehran

Abstract

Background: Polycyclic Aromatic Hydrocarbons (PAHs) as resistant compounds in the environment has received much 
attention in recent years due to their adverse effects on ecological health. Among the various methods studying the removal of PAHs, enzyme biotechnology is one of the most effective and appropriate method. 
Objectives: In the present study, a halophilic laccase was used for bioremoval of anthracene in the presence of 
1-Hydroxybenzotriazole (HBT).
Materials and Methods: Halophilic laccase from Alkalibacillus salilacus was tested for anthracene degradation. Residual 
concentration of anthracene at various concentrations of NaCl (0‒4 M), incubation time, pH, solvent, and surfactants in 
the enzymatic reaction mixtures was determined by HPLC.
Results: The maximum removal of substrate was achieved after 72 h at 40 °C, pH 8, and NaCl concentration 1.5 M. 
Besides, the addition of 1% (v/v) ionic and non-ionic surfactants and 25% (v/v) of various organic solvents increased 
removal efficiency. The kinetic parameters Km and Vmax of the laccase for removing of anthracene were 0.114 μM and 
0.546 μmoL. h.−1 mg−1, respectively. 
Conclusions: Laccase showed the maximum removal efficiency of anthracene in the presence of 1-Hydroxybenzotriazole 
(HBT).

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