Molecular Fluorophores for Deep-Tissue Bioimaging.

Area of Science:

• Biomedical Optics
• Molecular Imaging
• Nanotechnology

Background:

• In vivo deep-tissue fluorescence imaging faces challenges due to biological tissue's optical opacity.
• The second near-infrared (NIR-II) window (1000-1700 nm) offers improved optical access for deep-tissue imaging.
• Molecular fluorophores are vital for fluorescence bioimaging, especially for novel imaging techniques.

Purpose of the Study:

• To provide an overview of novel molecular fluorophores developed for deep-tissue bioimaging in the NIR-II window over the past five years.
• To discuss the advantages and disadvantages of these fluorophores in various applications.
• To offer guidelines for designing new molecular fluorophores with optimized properties for enhanced deep-tissue imaging.

Main Methods:

• Literature review of recent advancements in molecular fluorophore development for NIR-II bioimaging.
• Analysis of the pros and cons of identified fluorophores based on their spectral properties, quantum yield, and stability.
• Synthesis of design principles for future molecular fluorophore engineering.

Main Results:

• Significant progress has been made in developing novel molecular fluorophores tailored for the NIR-II window.
• These fluorophores exhibit improved performance for deep-tissue penetration and reduced autofluorescence.
• Key properties influencing performance include absorption/emission spectra, photostability, and biocompatibility.

Conclusions:

• The development of advanced molecular fluorophores is essential for realizing the full potential of NIR-II deep-tissue imaging.
• Future research should focus on designing fluorophores with enhanced brightness, stability, and specific targeting capabilities.
• Optimized fluorophores will significantly improve our understanding of complex biological systems in vivo.