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. 2019 Jun 27;14:4649–4666. doi: 10.2147/IJN.S201110

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© 2019 Xu et al.

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Structure and ¹H NMR spectrum of CS (A), HECS (B), HECA-ss-OA (C) and HECS-cc-OA (D). a, b, c, etc indicated the attribution of spectral peaks to protons from the structural units of conjugates.

Abbreviations: CS, chitosan; HECS, hydroxyethyl chitosan; HECS-cc-OA, redox-insensitive O, N-hydroxyethyl chitosan−octylamine conjugates; HECS-ss-OA, redox-sensitive O, N-hydroxyethyl chitosan−octylamine conjugates; NMR, nuclear magnetic resonance.