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Abstract:
In vivo H2O2 visualization is crucial for disease diagnosis. Catalytic reaction-based probes show potential in H2O2 detection, yet their in vivo application remains challenging because catalysts always require a specific pH to function and cellular glutathione (GSH) may suppress signaling by depletion of hydroxyl radicals and oxidized substrates. Here, a microenvironment-tailored catalytic nanoprobe (MTCN) comprising Fe2+, citric acid (CA), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), and downconversion nanoparticles in the liposomal cavity as well as a reference dye in the lipid membrane is reported, which utilizes the selective permeability of the liposomal membrane to offer a favorable pH for Fe2+ catalyst with the aid of CA and to avoid GSH-triggered signal loss by preventing entry of GSH into the cavity. The MTCN displays a large NIR-II fluorescence (FL) ratio between 1550 and 1080 nm (FL1550Em,808Ex/FL1080Em,980Ex), but a small photoacoustic (PA) ratio between 808 and 1048 nm (PA808/PA1048). Upon exposure of MTCN to H2O2, catalytic conversion of ABTS into its oxidized form ABTS·+ with 808 nm absorption causes a noticeable increment in PA808/PA1048 accompanied by an apparent decrement in FL1550Em,808Ex/FL1080Em,980Ex, enabling bimodal ratiometric imaging of H2O2 in the tumor and lymphatic metastasis. © 2022 Wiley-VCH GmbH.
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Advanced Functional Materials
ISSN: 1616-301X
Year: 2022
Issue: 47
Volume: 32
1 9 . 0
JCR@2022
1 8 . 5 0 0
JCR@2023
ESI HC Threshold:91
JCR Journal Grade:1
CAS Journal Grade:1
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 0
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