Supramolecular-mediated Immobilization of Trypsin on Cyclodextrin-modified Gold Nanospheres

Abstract

Bovine pancreatic trypsin was immobilized on β- and γ-cyclodextrin coated gold nanospheres via supramolecular associations. The enzyme retained 100%–120% of its catalytic activity and its thermal stability at 50°C was 2–2.5 fold increased in the presence of the β- and γ-cyclodextrin modified metal nanoparticles, respectively. The influence of these immobilization processes on the conformational properties of the enzyme was studied by fluorescence spectroscopy. These results open a new perspective to the possible application of cyclodextrin-modified gold nanospheres as water-soluble carriers for enzyme immobilization.