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Fluorescence spectra of PPO in the presence of CHOS (A), CHOS-CAT (B), CHOS-EGCG (C), CHOS-GAL (D) at 37 °C. a→f shows an increase in concentration of A, B, C, and D from 0 to 1 mg/mL. CHOS: chitooligosaccharide; CHOS-CAT: chitooligosaccharide-catechin; CHOS-EGCG: chitooligosaccharide-epigallocatechin gallate; and CHOS-GAL: chitooligosaccharide-gallic acid.
