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. 2018 Apr 10;8:5778. doi: 10.1038/s41598-018-22736-5

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© The Author(s) 2018

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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(a) UV-Vis spectra of AUNC-L, free ampicillin and ampicillin conjugated with AUNC-L (AUNC-L-Amp), inset is the zoomed image of AuNC-L and AuNC-L-Amp at 350 nm at elevated concentration. (b) FT-IR spectra of Lys, AUNC-L and AUNC-L-Amp showing second derivatives of amide-I bands (1700–1600 cm^-1). (c) XRD spectra of AUNC-L, Free-Amp, and AUNC-L-Amp. (d) Fluorescence emission spectra of AUNC-L and AUNC-L-Amp. (e) SERS spectra of lysozyme, AUNC-L, and AUNC-L-Amp.