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. 2017 Apr 11;15:29. doi: 10.1186/s12951-017-0262-9

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© The Author(s) 2017

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 — FTIR spectrum of imipenem/cilastatin (IMP), polycaprolactone nanoparticles (PCL), imipenem/cilastatin loaded polycaprolactone nanoparticles (IMP/PCL), polylactide-co-glycolide nanoparticles (PLGA), and imipenem/cilastatin loaded polylactide-co-glycolide nanoparticles (IMP/PLGA). a The spectrum from 4000 to 2000 cm⁻¹. b The spectrum from 2000 to 400 cm⁻¹