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. 2014 Aug 21;12(8):4635–4658. doi: 10.3390/md12084635

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© 2014 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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¹H NMR spectra overlay of the main compounds and final C-6 spacer quaternary derivatives of the representative chitosan material (CS-iv, 19%DA): (A) Mes-CS (2^iv); (B) diTBDMS-CS (3^iv); (C) BrHA-diTBDMS-CS (9^iv); (D) TMHA-CS (11^iv); (E) PyHA-CS (13^iv).