Activity of enzymes immobilized on plasma treated polyester

Publication date: Available online 18 September 2016 Source:Journal of Molecular Catalysis B: Enzymatic Author(s): Arfaoui Mohamed, Behary Nemeshwaree, Mutel Brigitte, Perwuelz Anne, Belhacene Kalim, Dhulster Pascal, Mamede Anne-Sophie, Froidevaux Rénato The aim of this study was to investigate the effect of 3 different surface plasma treatments on the immobilization of β-galactosidase on a fibrous PET nonwoven membrane. Two methods 1. Entrapment in a thin calcium alginate coating and 2. Direct sorption, were used to immobilize the enzyme. The three different plasma treatments for surface activation of PET nonwovens were: 1. Air atmospheric DBD plasma, 2. Cold remote plasma-CRP with 100% N2 and 3.- CRP with a mixture of N2/O2 gases. Plasma treatment of the PET fiber surface increased the quantity of immobilized enzyme using the entrapment method, and the degree of alginate film cross-linking highly influenced the enzyme activity. Highest enzyme activity was reached for the PET treated with air atmospheric plasma and cross-linked with 0.25g/l of CaCl2. With the direct sorption method, greater amounts of enzyme were immobilized as compared to the entrapment method, but a considerable proportion of enzyme lost their catalytic activity. Only with the CRP N2/O2 plasma treatment, up to 90% of sorbed enzyme maintained their activity. Reusability study showed that for the optimized entrapment method, a progressive decrease in activity was observed after each use cycle. Wi...

Source: Journal of Molecular Catalysis B: Enzymatic - September 18, 2016 Category: Biochemistry Source Type: research