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FTIR spectra of the initial chitosan (CTS0, Mw = 94.28 kDa) (a), chitosan obtained through the heterogeneous degradation of chitosan by H2O2 (CTS1, Mw = 48.35 kDa) (b), OCS1 (Mw = 5.48 kDa) (c), OCS2 (Mw = 4.21 kDa) (d), and OCS3 (Mw = 3.60 kDa) (e).
