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2024-07-12
  • Research Findings
  • Institute of Atomic and Molecular Sciences
Short-wave infrared fluorescence cytometry: The next-generation analytical technology for fluorescently labelled cells

Fluorescence cytometry is a widely used method for identifying cellular expressions. Live cells are highly complex, and their precise identification often requires simultaneous staining of more than 20 biomarkers. However, in traditional flow cytometry, the number of available channels is limited by wavelength constraints, which has reached its physical limits and hinders accurate determination and identification of target cells. The research led by Assistant Research Fellow Dr. Ching-Wei Lin at the Institute of Atomic and Molecular Sciences has developed and demonstrated a detection technology that extends the spectral range to wavelengths up to 1550 nm. The most significant breakthrough of this technology is the expansion of the spectral range by more than 2.5 times. By combining this technology with short-wave infrared (SWIR; 900-1700 nm) fluorescent materials such as single-wall carbon nanotubes, indium arsenide quantum dots, down-conversion rare-earth nanoparticles, polymer dots, and donor-acceptor-donor small molecular dyes recently developed by synthetic materials chemists, it is possible to increase the number of spectral detection channels to >50, significantly improving the accuracy of complex live cell detection and identification. The main contribution of this work lies in addressing the uncertainty that scientists previously had about whether flow cytometry could achieve such detection limits in the SWIR range. Even with the existence of long-wavelength fluorescent materials, it was uncertain if the complexity of spectral mixing issues could be solved or reduced. This research provides positive insights in this regard, giving future researchers confidence to continue advancing in this direction. This research was published online on July 8, 2024 in ACS Nano, with financial support from Academia Sinica and the National Science and Technology Council in Taiwan.

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