Homogeneous and heterogeneous methods for laccase-mediated functionalization of chitosan by tannic acid and quercetin

► Preparation and characterization of polyphenol-functionalized chitosans. ► Homogeneous and heterogeneous methods for functionalization using laccase as catalyst. ► Imparting remarkable antioxidant properties. ► Antimicrobial activities depending on the mode of functionalization and type of microorganism.