In separate experiments, 1 g of each carrier (Alumina, Ceramic, Chitin, Chitosan, PVC, Silica and Polystyrene) was incubated with 5 ml of the enzyme solution (200 U of B. amyloliquifaciens CGTase dissolved in 0.1 M phosphate buffer, pH 6.0) at 4 °C for 16 h. The unbound enzymes were removed from the carriers by washing with 0.1 M phosphate buffer (pH 6.0) until no protein or activity was detected in the wash.
2.4.2. Ionic binding