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. 2022 May 23;27(10):3343. doi: 10.3390/molecules27103343

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Macroscopic image of chitosan membranes—sample 1 (A) and sample 2; (B) before and after 24 h alkali treatment with 1 M NaOH aqueous (upper row) and 1 M NaOH ethanol solutions (lower row). Types of samples prepared for research (C).