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. 2019 Jul 5;17:79. doi: 10.1186/s12951-019-0512-0

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 7 — a UV–vis spectra of 3Cys-ΔC-stabilized Au NCs, curcumin encapsulated 3Cys-ΔC-stabilized Au NCs, and free curcumin. b TEM image of curcumin encapsulated within the cavity of 3Cys-ΔC-stabilized Au NCs. c Encapsulation of curcumin within the cavity of 3Cys-ΔC-Au NCs composite has no effect on the fluorescence spectrum of 3Cys-ΔC-stabilized Au NCs. Inset: curcumin encapsulated by 3Cys-ΔC-Au NCs under visible light and UV-light, and free curcumin (from left to right)