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. 2017 Jul 26;7:6577. doi: 10.1038/s41598-017-06028-y

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Preparation and characterization of the ND-Dex complex. (A) Schematic describing the steps necessary to prepare the ND-Dex complex and the possible interactions between the drug and the ND surface. (B) FT-IR spectra in the range of 4000 to 800 cm⁻¹ of ND, Dex, and the complex. Highlighted in red are the characteristics FT-IR peaks defining the main functional groups involved in the complex formation. (C) The EDX spectra of ND showed the presence mainly of carbon and oxygen on the NDs surface. (D) EDX spectra of the ND-Dex conjugate indicating the presence of fluorine on the surface of ND, thus confirming the adsorption of Dex on the NDs surface (E) TEM images of ND and ND-Dex complex suspensions in water (Scale bar = 50 nm). (F) Comparison of the hydrodynamic properties of ND and the ND-Dex complex in ultrapure water. Data are expressed as mean ± S.D. (n = 3).