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. 2021 Aug 12;10(8):968. doi: 10.3390/antibiotics10080968

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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The upper panel shows the gold nanoparticles’ preparation steps: (a) HAuCl₄·3H₂O only, (b) HAuCl₄·3H₂O + GSH at pH 8, (c) formation of gold after the addition of NaBH₄, and formation of gold nano-conjugates, (d) GNP-kaempferol, (e) GNP-chrysin, and (f) GNP-quercetin. The lower panels show (g) the UV-VIS spectra of the GNPs, (h) the UV-VIS spectra of GNP-kaempferol, (i) the UV-VIS spectra of GNP-chrysin, and (j) the UV-VIS spectra of GNP-quercetin.