Abstract
A novel pullulanase partially purified from Fontibacillus sp. was covalently immobilized on Florisil® and nano-silica through both glutaraldehyde and (3-glycidyloxypropyl)trimethoxysilane spacer arms. The pullulanase immobilized on Florisil® and nano-silica through glutaraldehyde spacer arm showed 85 and 190 % activity of its free form, respectively, whereas no activity was observed when it was immobilized on the same supports through (3-glycidyloxypropyl)trimethoxysilane spacer arm. The maximum working pHs of both the immobilized pullulanases on Florisil® and nano-silica through glutaraldehyde spacer arm were determined as 5.0; however, the maximum working pH of the free pullulanase was pH 6.0. The maximum temperatures of all the pullulanase preparations were determined as 35 °C. The apparent K m values were 1.49, 1.54, and 0.59 mg/mL pullunan, respectively, for the free and immobilized pullulanases on Florisil® and nano-silica. The corresponding apparent V max values were 0.59, 1.53, and 1.57 U mg prot.−1 min.−1. Thermal stability of pullulanases immobilized on Florisil® and nano-silica was enhanced 6.5- and 15.6-folds, respectively at 35 °C and 6.6- and 16.0-folds, respectively, at 50 °C. The pullulanases immobilized on Florisil® and nano-silica protected 71 and 90 % of their initial activities after 10 reuses.
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Alagöz, D., Yildirim, D., Güvenmez, H.K. et al. Covalent Immobilization and Characterization of a Novel Pullulanase from Fontibacillus sp. Strain DSHK 107 onto Florisil® and Nano-silica for Pullulan Hydrolysis. Appl Biochem Biotechnol 179, 1262–1274 (2016). https://doi.org/10.1007/s12010-016-2063-2
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DOI: https://doi.org/10.1007/s12010-016-2063-2