Biochemical activities of 6-carboxy β-chitin derived from squid pens

► After TEMPO/NaBr/NaClO oxidation, the yield of T-chitin with carboxylate content of 2.08 mmol/g reached 74.55%. ► The highest bile acid binding capacity among four T-chitins reached 41.18 mg/g. ► EC50 values of T-chitins against hydroxyl radicals were below 1.2 mg/mL. ► At 8 mg/mL, the maximum ferrous chelating effects of T-chitins reached 80.15%.