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. 2019 Jan 22;17:12. doi: 10.1186/s12951-019-0449-3

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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. 2 — Fourier-transform infrared spectra of NPs. A Spectra of MP (trace a), PEG (trace b), MP-PEG (trace c), and the physical mixture of MP and PEG (trace d). Peaks at 3408, 1654 and 3200 cm⁻¹ corresponded, respectively, to the free υ_O–H, conjugated υ_C=O and connective υ_O–H. B Spectra of MP (trace a), blank NPs (trace e), NHS-PEG5000-MAL (trace f), NEP_1-40 (trace g), NEP1-40-MP-NPs (trace h), and the physical mixture of MP, NHS-PEG5000-MAL and NEP_1-40 (trace i). Peaks at 1716 and 3400 cm⁻¹ corresponded, respectively, to amino ester υ_{C = O} and connective υ_O–H