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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/).
(a) TEM images of HA/CS NPs made of 280 kDa, 540 kDa or 820 kDa HA (scale bar = 400 nm); (b) UV-vis spectra scanned from 200 nm to 700 nm of CS-RhB conjugate (red dashed line), RhB (red full line) and CS (grey line).