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. 2022 May 23;20:240. doi: 10.1186/s12951-022-01441-6

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© The Author(s) 2022

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/. 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 in a credit line to the data.

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Fig. 4 — In vitro chemodynamic activity of MPG NPs. A UV-visible absorption spectra and photo (inset) of MB degradation induced by Mn²⁺ in different solutions. B UV-visible absorption spectra and photo (inset) of MB in the presence of Mn²⁺ and H₂O₂ alone. C UV-visible absorption spectra and photo (inset) of MB degradation induced by Mn²⁺ when the concentration of H₂O₂ gradually increases. D UV-visible absorption spectra and photo (inset) of MB degradation induced by Mn²⁺ with or without GSH. E UV-visible absorption spectra and photo (inset) of MB degradation induced by Mn²⁺ when the concentration of GSH gradually increases. F UV-visible absorption spectra and photo (inset) of MB degradation induced by Mn²⁺ (Mn₃O₄@PEG) when the concentration of GSH gradually increases. G UV-visible absorption spectra and photo (inset) of MB degradation induced by Mn²⁺ (Mn₃O₄@PEG) when the concentration of GSH gradually increases. H UV-visible absorption spectra and photo (inset) of MB degradation induced by Mn²⁺ (MPG NPs) when the concentration of GSH gradually increases. I Schematic diagram of MPG NPs reacting with GSH to produce Mn²⁺ and converting endogenous H₂O₂ into ·OH. J DCF fluorescence of SGC 7901 ADR with or without MPG NPs