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. 2021 Mar 31;12:2002. doi: 10.1038/s41467-021-22286-x

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© The Author(s) 2021

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

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Fig. 1 — a Schematic illustrating selective activated pH-responsive oxidase-like activity of PtCo@G in gastric acid conditions. b TEM image of PtCo@G. Insert shows corresponding structure diagram of PtCo@G (including the PtCo nanocrystal core and graphitic shell) and digital photos of the PtCo@G solution. c Raman spectrum of PtCo@G. d The digital photos, MR T₂ relaxivity, T₂-weighted phantom images and corresponding quantitative data analysis on T₂-weighted phantom images of PtCo@G in H₂O, PBS (pH 1.0), and SGF after 12 h incubation. e Profiles for Co²⁺ and Pt²⁺ release from PtCo@G nanocrystals in H₂O, PBS (pH 1.0), and SGF. f UV-Vis absorbance spectra of TMB in different reaction systems: TMB, PtCo@G, and PtCo@G + TMB in a pH 4.0 PBS buffer after 30 min incubation. g PtCo@G catalyzes the oxidation of various substrates to produce different color reactions. (1) TMB, (2) ABTS, and (3) OPD. Insert images show corresponding visual color changes. h Selective activated pH-responsive oxidase-like activity of PtCo@G under gastric acid conditions. i Oxidase-like activity of the PtCo@G in SGF. Insert images show corresponding visual color changes and the reaction between TMB and PtCo@G in SGF. The data indicate the means and SD from three parallel experiments. Source data are provided as a Source Data file.