FeMn single-atom nanozyme dual-readout HER2 test
An etched FeMn–N–C nanozyme boosts peroxidase-like activity 2.03-fold and reports HER2 by electrochemistry and 808 nm photothermal readout.
Source
Bimetallic Single-Atom Nanozyme-Based Electrochemical-Photothermal Dual-Function Portable Immunoassay with Smartphone Imaging
Study at a glance
- Design
- Animal / in-vitro — FeMn–N–C nanozyme sandwich immunoassay with electrochemical and 808 nm photothermal readouts versus ELISA
- N
- N=5 · Five hospital sera compared with commercial HER2 ELISA; calibration n = 6–7
- Population
- Human serum HER2 immunoassay samples plus TMB/H2O2 nanozyme assays
- Outcome
- Etched FeMn–N–C raises peroxidase-like activity 2.03-fold and dual readouts agree with commercial HER2 ELISA
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Inspect source passages
FeMn single-atom nanozyme dual-readout HER2 test
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
How is POD activity assayed?
the absorbance at 652 nm was quantified
How was serum accuracy checked?
All experimental values ( t exp ) were found to be below the critical value ( t crit ) of 2.78
What they did
Authors pyrolyzed ZnO@ZIF-8 to N-doped carbon, doped Fe/Mn, etched defects, assayed TMB/H2O2 POD activity, built a sandwich immunoassay, and compared five hospital sera to ELISA.
What they found
FeMn-NCetch/SAC is 2.03× more POD-active than Fe-NC/SAC. Dual electrochemical and 808 nm photothermal signals agree with a commercial HER2 ELISA (texp < 2.78).
The limits
What it doesn't show
This is a five-sample serum comparison, not a multicenter diagnostic trial; ‘biotherapeutic’ potential is speculative.
Key terms
- Single-atom nanozyme
- M–N–C sites that mimic peroxidase (POD) activity.
- POD-like activity
- Catalysis of TMB oxidation by H2O2, read at 652 nm.
- HER2
- Breast-cancer biomarker detected in the sandwich assay.
- Photothermal readout
- 808 nm laser heating used as a second signal channel.
- Dual-readout immunoassay
- Independent electrochemical and thermal signals for the same capture event.
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Quiz yourself
POD-like activity rose by about:
Common questions
How much did bimetallic etching help POD activity?
2.03 times vs Fe-NC/SAC.
Second signal?
808 nm photothermal with a digital multimeter.
Clinical check?
Five sera vs commercial ELISA, t below 2.78.
TMB readout wavelength?
652 nm.
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