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. 2019 May 2;11(5):209. doi: 10.3390/pharmaceutics11050209

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© 2019 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) ¹H NMR spectra of CS, WSCS30, and WSCS90 in DCl/D₂O. (b) A comparison of ¹³C NMR spectra of WSCS30 in CD₃COOD/D₂O obtained after dialysis against DI water (top) and 0.1 M NaCl solution (bottom), respectively. The peaks for trifluoroacetate ions are indicated by arrows. WSCS—water-soluble chitosan.