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. 2019 Mar 19;9(3):459. doi: 10.3390/nano9030459

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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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¹H NMR spectra of the synthesized polymers. (A) polyethylenimine-grafted cationic MC derivative (MC-PEI), (B) cholic acid-conjugated methylcellulose-polyethylenimines (MCPEI-CA)₃, (C) MCPEI-CA₆, and (D) MCPEI-CA₁₀.