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Yes, in preclinical experiments: nanoparticle-based sensors have detected signals associated with drug-induced liver injury in cultured cells and animal models. They are not established tests for diagnosing liver damage in people. One 2024 study, for example, used a fluorescent nanoprobe to detect peroxynitrite in acetaminophen-treated liver cells—not to diagnose every kind of liver injury or detect every drug directly.
What does the sensor actually detect?
The best-matched example is CD–N-I, a fluorescent nanoprobe reported by Wu and colleagues in Chemical Science. It detects peroxynitrite (ONOO−), a reactive molecule associated with cellular injury, including acetaminophen-induced liver injury. The probe therefore measures a particular chemical signal linked to injury; it is not a universal detector of drugs or liver damage.
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CD–N-I combines carbon dots with a naphthalimide–isatin sensing molecule through electrostatic self-assembly. In its sensing design, the carbon dots donate energy and naphthalimide accepts it through Förster resonance energy transfer (FRET). Peroxynitrite cleaves the isatin receptor, activating the fluorophore and switching on FRET.
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Why the signal changes color
The readout is ratiometric: as peroxynitrite increases, emission at 462 nm decreases while emission at 562 nm increases. Comparing the two emissions as a ratio can reduce interference from probe concentration and the surrounding environment, according to the study’s authors. The result is a measurable optical change rather than a direct measurement of liver function.
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How sensitive and fast was the CD–N-I test?
In controlled buffer experiments, the paper reports a 0.22 μM limit of detection and a linear fluorescence-ratio response across 0–40 μM peroxynitrite. The authors also report that the reaction took about one minute to complete. These values were measured in PBS at pH 7.4 and 25 °C under the study’s specified excitation and emission conditions. They describe the laboratory assay, not the sensitivity, accuracy, or time to diagnosis of a test in people. The researchers also report selectivity against the competing reactive oxygen species and ions they tested. Read the Chemical Science study.
What did the acetaminophen experiment establish?
The researchers imaged both added and naturally generated peroxynitrite in live HepG2 cells. In the drug-injury experiment, they treated the cells with acetaminophen (APAP) and observed the fluorescence ratio rise over time. N-acetylcysteine, a treatment used in the experiment, reduced the signal.
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This supports using the probe to study a chemical injury signal in a cell model and may help researchers evaluate protective compounds in cells. It does not establish that CD–N-I can diagnose patients, is safe to use clinically, or works in an intact human liver.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteHow do other nanoparticle approaches differ?
Other preclinical studies use different targets and optical designs. They should not be treated as interchangeable with CD–N-I or as evidence of equivalent performance: the studies do not report a head-to-head comparison.
| Approach | Target or signal | Readout | Test setting and evidence |
|---|---|---|---|
| CD–N-I, Chemical Science (2024) | Peroxynitrite | Ratiometric FRET fluorescence | Live HepG2 cells, including an acetaminophen injury experiment; not a patient test. Study |
| miR-122 upconversion nanoprobe, Talanta (2024) | miR-122, used as a biomarker | Upconversion nanoparticles and Prussian blue nanoparticles for imaging | In situ imaging of drug-induced liver injury in experimental models; the cited record does not establish routine clinical testing. Study record |
| Persistent-luminescence imaging (2025) | An oxidative-stress-responsive mechanism | Persistent luminescence | Acetaminophen-induced mouse liver injury. The authors report detection approximately 10 hours earlier than serum-based detection methods in that model; this is a model-specific comparison, not a general clinical result. Study |
Can a sensor detect acetaminophen liver damage earlier?
One persistent-luminescence study reports earlier detection in a mouse model, but that result should not be generalized to people. The CD–N-I paper reports a changing signal over time in acetaminophen-treated cells; it does not compare the probe’s detection time with a clinical blood test. These findings are promising research results, not evidence that nanoparticle sensors currently provide earlier diagnosis for patients.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Are nanoparticle liver-injury sensors available as a test?
The studies described here are research demonstrations, not established consumer or routine clinical diagnostic products. The CD–N-I sensor is a custom research construct. The cited studies do not establish clinical safety, patient-level diagnostic performance, or routine availability. A laboratory or animal-model result should not be used to assess a person’s liver health or guide treatment.
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