Protocatechuic acid grafted onto chitosan: Characterization and antioxidant activity

•PA was grafted onto CS by a carbodiimide mediated cross-linking reaction.•PA-g-CS was characterized by several instrumental methods.•Amide and ester linkages were formed between PA and CS.•PA-g-CS showed lower crystallinity and thermal stability than CS.•PA-g-CS exhibited higher antioxidant activit...

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