Competitive adsorptions of nitrile hydratase and amidase on polyacrylonitrile and its effect on surface modification

► Efficiency of enzymatic treatment of polyacrylonitrile depends on pH. ► Competitive adsorption of nitrile hydratase and amidase on polyacrylonitrile observed at pH 5.8. ► Sequential adsorptions of nitrile hydratase and amidase on polyacrylonitrile observed at pH 7.