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A novel biopolymer-based antioxidant, chitosan conjugated with gallic acid (chitosan galloylate, chitosan–GA), is proposed. Electron paramagnetic resonance (EPR) demonstrates a wide range of antioxidant activity for chitosan–GA as evidenced from its reactions with oxidizing free radicals, that is, 1,1-diphenyl-2-picryl-hydrazyl (DPPH), horseradish peroxidase (HRP)–H 2 O 2 , carbon-centered...
A novel derivative of chitosan, chitosan–gallic acid (chitosan–GA), obtained from a simple conjugating condition with gallic acid using carbodiimide is proposed. The conjugation with gallic acid brings the water-solubility or water swelling property to chitosan. The studies on the free radical scavenging of chitosan–GA clarify its significant antioxidant activity on free radicals, i.e. carbon-centered...
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