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Taheri Serpil Karaca Zuleyha Rassoulzadegan Minoo Mehmetbeyoglu Ecmel Zararsiz Gokmen Sener Elif Funda Bayram Kezban Korkmaz Tufan Esra Sahin Mustafa Caglar Marasli Mert Kahraman Memis Mehmet Canatan Halit Ozturk Figen Tanriverdi Fatih Unluhizarci Kursad Kelestimur Fahrettin 《Cellular and molecular neurobiology》2022,42(5):1523-1542
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To obtain regenerable magnetic nanoparticles, triethoxy(3-isocyanatopropyl)silane and iminodiacetic acid (IZ) were used as the starting material and immobilized on Fe3O4 nanoparticles. Copper ions (Cu2+ ions) were loaded on the Fe-IZ nanoparticles and used for cellulase immobilization. The support was characterized by spectroscopic methods (FTIR, NMR) and thermogravimetric analysis, transmission electron microscopy, scanning electron microscope, X-ray diffraction, energy dispersive X-ray analysis, and vibrating sample magnetometer techniques. As a result of experiments, the amount of protein bound to immobilized cellulase (Fe-IZ-Cu-E) and cellulase activity was found to be 33.1 mg/g and 154 U/g at pH 5, 50°C, for 3 h. The results indicated that the free cellulase had kept only 50% of its activity after 2 h, while the Fe-IZ-Cu-E was observed to be around 77%, at 60°C. It was found that the immobilized cellulase maintained 93% of its initial catalytic activity after its sixth use. Furthermore, the Fe-IZ-Cu-E retained about 75% of its initial activity after 28 days of storage. To reuse the support material (Fe-IZ-Cu), it was regenerated by thorough washing with ammonia or imidazole. 相似文献