. 2022 Jun 7;14(12):2310. doi: 10.3390/polym14122310
© 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/).
Figure 4.
SEM image of an empty chitosan microparticle.