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. 2019 Oct 23;24(21):3815. doi: 10.3390/molecules24213815

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© 2019 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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(a) FT-IR spectra of QCT and the NPs prepared in this study showing the characteristic bands for O-H stretching (3300–3700 cm⁻¹), C=C-H stretching (2900–3000 cm⁻¹), and C=O/C=C aromatic stretching (1400–1800 cm⁻¹); (b) UV-Vis spectra of QCT and QCT NPs. Top: Aqueous dispersions of QCT NPs synthesized at a QCT:NaIO₄ ratio of 1:1, 1:2, 1:3, and 1:4 (NP1, NP2, NP3, and NP4, respectively) next to QCT. UV-Vis revealed a shift in the characteristic absorption bands of QCT after oxidation and NP formation, accompanied by a distinct change in color.