Fig. 5

Advantages of CS-based nanocarriers for the treatment of DR (A) and mucoadhesive character of chitosan, illustrating the interaction between protonated amine groups of chitosan with the negatively-charged sialic acid residues present on the mucin layer of the cornea. Reproduced and modified from [172] under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/)