Activity stabilization of Aspergillus niger and Escherichia coli phytases immobilized on allophanic synthetic compounds and montmorillonite nanoclays

Menezes-Blackburn, Daniel and Jorquera, Milko and Gianfreda, Liliana and Rao, Maria and Greiner, Ralf and Garrido, Elizabeth and de la Luz Mora, María (2011) Activity stabilization of Aspergillus niger and Escherichia coli phytases immobilized on allophanic synthetic compounds and montmorillonite nanoclays. Bioresource Technology, 102 (20). pp. 9360-7. ISSN 0960-8524

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Abstract

The aim of this work was to study the stabilization of the activity of two commercial microbial phytases (Aspergillus niger and Escherichia coli) after immobilization on nanoclays and to establish optimal conditions for their immobilization. Synthetic allophane, synthetic iron-coated allophanes and natural montmorillonite were chosen as solid supports for phytase immobilization. Phytase immobilization patterns at different pH values were strongly dependent on both enzyme and support characteristics. After immobilization, the residual activity of both phytases was higher under acidic conditions. Immobilization of phytases increased their thermal stability and improved resistance to proteolysis, particularly on iron-coated allophane (6% iron oxide), which showed activation energy (E(a)) and activation enthalpy (ΔH(#)) similar to free enzymes. Montmorillonite as well as allophanic synthetic compounds resulted in a good support for immobilization of E. coli phytase, but caused a severe reduction of A. niger phytase activity.

Item Type:
Journal Article
Journal or Publication Title:
Bioresource Technology
Additional Information:
Copyright © 2011. Published by Elsevier Ltd.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2311
Subjects:
ID Code:
81064
Deposited By:
Deposited On:
31 Aug 2016 15:14
Refereed?:
Yes
Published?:
Published
Last Modified:
26 May 2020 05:08