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. 2020 Mar 5;25(5):1181. doi: 10.3390/molecules25051181

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© 2020 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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Fourier transform infrared spectra (FT-IR) of (a) Chitosan (CS), (b) Lipoic acid (LA), (c) Chitosan–lipoic acid nanoparticles (CSLA-NPs), (d) 17α-Methyltestosterone (MT), (e) 17α-Methyltestosterone/Chitosan–lipoic acid nanoparticles (MT/CSLA-NPs), (f) Hyaluronic acid (HA), (g) Hyaluronic acid–chitosan–lipoic acid nanoparticles (HACSLA-NPs), (h) 17α-Methyltestosterone/Hyaluronic acid–chitosan–lipoic acid nanoparticles (MT/HACSLA-NPs) (The peaks which are discussed in the text were marked by stars).