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

► The residual activity of phytases was higher when immobilized under acid pHs. ► Immobilization of phytases on nanoclays increased thermal and proteolytic stability. ► Allophane coated with 6% iron oxide was the most promising nanoclay support. ► Montmorillonite was good support only for immobilization of Escherichia coli phytase.