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ATR-FTIR spectra of (a) chitosans: (i) precursor chitosan before modification, (ii) chitosan after degradation by the H2O2/ascorbic acid redox system and modification with (iii) gallic acid (CS-G), (iv) hydroquinone (CS-H), and (v) phloroglucinol (CS-P). (b) 1H NMR spectra of (i) CS and (ii) CS-G. (c) Dependence of DPPH inhibition on the concentration of modified chitosans.
