A rapidly growing area of neuroscience demands next-generation neurofluorescent probes are fulfilling several stringent criteria, including water solubility, distinct signal-to-background ratio, anti-photobleaching, and low toxicity. Herein, a novel neurofluorescent probe based on gold nanoclusters capped with glutathione (Au-GSH) is introduced and characterized by advanced fluorescence photophysical properties composed of comparative high quantum yield (8.9%), negligible blinking, and bright fluorescence in the red spectral range (Em = 650 nm) with sub-millisecond-scale lifetime (0.62 ms). Fluorescent performance is tested and demonstrated negligible photobleaching under exposure to ultraviolet light (365 nm, 30 W) over 4 h, immunity to variation of the microenvironment characterized by pH range of 4–10, and colloidal stability in serum over 24 h during the blood circulation. Coupled with 2.4 ± 0.9 nm ultrasmall size and good water solubility, they are superior to fluorescent proteins, quantum dots, and organic fluorescent dyes. Au-GSH are further confirmed that they can be used as a fluorescent label for in vivo nerve and brain imaging, and even after injecting Au-GSH into the rat sciatic nerve for 21 d, the red fluorescence is still preserved. This combination of favorable properties makes Au-GSH a promising candidate for neurofluorescent probes.
Bibliographical noteFunding Information:
This work was supported by the National Nature Science Foundation of China (Grant Nos. 51861145311 and 51373061) and Interdisciplinary Innovation Project of the First Hospital of Jilin University (JDYYJCHX2020005).
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- brain imaging
- gold nanoclusters
- long-time tracing
- neurofluorescence imaging
- red fluorescent probes