Competitive Biological Activities of Chitosan and Its Derivatives: Antimicrobial, Antioxidant, Anticancer, and Anti-Inflammatory Activities

Figure 3

(a) Schematic presentation of enzymatic oxidation of catechin by laccase and nonenzymatic grafting with chitosan and (b) enzymatically modified chitosan film with catechin flavonoids (A) and unmodified chitosan film (B). After modification with catechin, the antioxidant activity of films reached to 100% in 60 minutes while chitosan film (b) showed less than 40% of radical reduction. b1: 95% of DDA; b2: 64% of DDA (adapted and modified from [26]).

(a)

(b)