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FTIR spectra of COS (A), GAL and COS-GAL (B), FER and COS-FER (C), CAF and COS-CAF (D), EGCG and COS-EGCG (E), and CAT and COS-CAT (F): COS, chitooligosaccharide; GAL, gallic acid; FER, ferulic acid; CAF, caffeic acid; EGCG, epigallocatechin gallate; CAT, catechin.
