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. 2020 Mar 6;10(3):477. doi: 10.3390/nano10030477

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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Characterization of polyethylenimine polyethylene glycol iron oxide nanoparticles (PEI-PEG-IONPs) and release of salinomycin from salinomycin-loaded (Sali)-PEI-PEG-IONPs: (a) transmission electron microscopy (TEM) images of PEI-PEG-IONPs, with core size measurement of the nanoparticles; (b) size distribution histogram; (c) Fourier transform infrared (FTIR) spectrum; (d) release of salinomycin from the nanoparticles in pH 7.4 (physiological pH) and pH 4.5 (pH of acidic intracellular compartments such as endosomes).