Abstract
This study describes the immobilization of ginger peroxidase on amino-functionalized silica-coated titanium dioxide nanocomposite and its application in bioremediation process. A dramatic enhancement in enzyme activity was observed after immobilization on nanosupport which was evident from the effectiveness factor (η) value of 1.76. Immobilization of enzyme on nanosupport was confirmed by transmission electron microscopy, scanning electron microscopy, and Fourier transform infrared spectroscopy. Immobilized peroxidase exhibited higher activity in a broad range of pH and temperature as compared to free enzyme. Also, the thermostability of peroxidase was strikingly improved upon immobilization. After six repeated uses, the immobilized peroxidase retained around 62% of its dye decolorization activity. V max of the enzyme was changed to 35.01 μmol L−1 min−1 from 8.42 μmol L−1 min−1 after immobilization on nanocomposite, which was a fourfold increase as compared to the free enzyme. Circular dichroism spectroscopy demonstrated conformational changes in the secondary structure of the enzyme, a possible reason for the enhanced enzyme activity after immobilization. Immobilized peroxidase was highly efficient in the removal of acid yellow 42 dye in a stirred batch process, i.e., 90% of the dye was decolorized within 1.5 h as compared to the free enzyme decolorizing only 69% of the dye in the same period. Our results clearly demonstrate that this nanobioconjugate with enhanced catalytic activity, high stability, and very good reusability has remarkable potential for the treatment of aromatic pollutants present in wastewater.
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Acknowledgments
Misha Ali is thankful to U.G.C., New Delhi, for the award of UGC-SRF fellowship. The University Sophisticated Instrumentation Facility (USIF), AMU Aligarh is gratefully acknowledged for the TEM and SEM analysis. The authors are extremely thankful to the Department of Chemistry, AMU Aligarh for the FT-IR analysis.
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Ali, M., Husain, Q., Alam, N. et al. Enhanced Catalytic Activity and Stability of Ginger Peroxidase Immobilized on Amino-Functionalized Silica-Coated Titanium Dioxide Nanocomposite: A Cost-Effective Tool for Bioremediation. Water Air Soil Pollut 228, 22 (2017). https://doi.org/10.1007/s11270-016-3205-4
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DOI: https://doi.org/10.1007/s11270-016-3205-4