ArticleJournal of the American Chemical Society2024
Unraveling Eumelanin Radical Formation by Nanodiamond Optical Relaxometry in a Living Cell.
Article in Journal of the American Chemical Society, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Single-Cell Hyperthermia: Diamond Quantum Thermometry Reveals Thermal Control of Macrophage Polarization.Advanced materials (Deerfield Beach, Fla.) · 2026Article
- Tumor Spheroid Uptake of Fluorescent Nanodiamonds Is Limited by Mass Density: A 4D Light-Sheet Assay.Chemical & biomedical imaging · 2025Article
- Advances of Fluorescent Nanodiamond Platforms for Intracellular and On-Chip Biosensing.Biosensors · 2024Review
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Authors and funding
13 authors.
Funding
Abstract
Defect centers in a nanodiamond (ND) allow the detection of tiny magnetic fields in their direct surroundings, rendering them as an emerging tool for nanoscale sensing applications. Eumelanin, an abundant pigment, plays an important role in biology and material science. Here, for the first time, we evaluate the comproportionation reaction in eumelanin by detecting and quantifying semiquinone radicals through the nitrogen-vacancy color center. A thin layer of eumelanin is polymerized on the surface of nanodiamonds (NDs), and depending on the environmental conditions, such as the local pH value, near-infrared, and ultraviolet light irradiation, the radicals form and react in situ. By combining experiments and theoretical simulations, we quantify the local number and kinetics of free radicals in the eumelanin layer. Next, the ND sensor enters the cells via endosomal vesicles. We quantify the number of radicals formed within the eumelanin layer in these acidic compartments by applying optical relaxometry measurements. In the future, we believe that the ND quantum sensor could provide valuable insights into the chemistry of eumelanin, which could contribute to the understanding and treatment of eumelanin- and melanin-related diseases.
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Registered trials
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