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. 2021 Nov 27;16:169. doi: 10.1186/s11671-021-03626-8

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Doxorubicin (DOX) loading in FePO₄ NPs and characterization of FePO₄-DOX. a DOX loading efficiency in three different formulations of FePO₄ NPs and DOX, b pictorial representation of the change of color from yellow to brown after DOX loading in FePO₄ to formulate FePO₄-DOX, c emission spectra characterization of DOX loaded FePO₄ NPs (FePO₄-DOX) after excitation at 480 nm, d hydrodynamic size distribution of FePO₄-DOX NPs, and e zeta potential characterization of FePO₄-DOX NPs showing surface charge (data represents mean ± s.d.; n = 3 replicates)