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Synthetic route and chemical structures of mPEG-acid and mPEG-g-chitosan. Schematic representation of chemical reactions producing (a) mPEG-acid and (b) mPEG-g-chitosan; FTIR spectra of (c) mPEG, succinic anhydride and mPEG-acid, and (d) chitosan and mPEG-g-chitosan; (e) Chemical structure of mPEG-g-chitosan, and (f) 1H NMR spectra of mPEG-g-chitosan (purple) and pure chitosan (gray).
