Abstract
New support was fabricated to enhance theenzyme activity of cellulase following immobilization. Functionalized core-shell magnetic gold nanoparticles were prepared and characterized by X-ray diffraction (XRD), vibrating sample magnetometer (VSM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Cellulase enzyme was immobilized on support via covalent bonding. Thesuccessful binding of the enzyme was chemically confirmed by Fourier-transform infrared spectroscopy (FTIR). The binding efficiency was 84% determined by Bradford assay. Filter Paper Activity (FPase) method was used to measure the enzyme activity at different temperatures (35-75 °C) and pH (2-8). The immobilized cellulase maintained 73% of its initial catalytic activity after 9h and its activity is 0.78mmol.ml-1. The newly designed nano-system also enhanced thethermal stability of immobilized cellulase in comparison to free cellulase and facilitated its long term storage.
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