Plasmon-Enhanced Four-Wave Mixing Imaging for Microdroplet-Based Single-Cell Analysis.

Area of Science:

• Biophotonics
• Analytical Chemistry
• Cell Biology

Background:

• Current single-cell analysis methods face limitations in sensitivity, automation, and photostability.
• The need for advanced techniques to assess cell surface receptors with high precision is critical for biological and medical research.

Purpose of the Study:

• To develop a high-throughput, single-cell analytical technique for sensitive and automated assessment of cell surface receptors.
• To introduce plasmon-enhanced four-wave mixing (PE-FWM) imaging integrated with microdroplet arrays for enhanced cellular analysis.

Main Methods:

• Preparation of metal nanoprobes by decorating metal nanoparticles with capturing molecules (antibodies or surface identification molecules).
• Utilizing microdroplet array integration with plasmon-enhanced four-wave mixing (PE-FWM) imaging.
• Employing multifrequency laser selection via resonating plasmonic bands for nanoprobes recognition.

Main Results:

• The developed PE-FWM imaging technique provides highly sensitive and automatic assessment of cell surface receptors.
• Metal nanoprobes exhibit superior recognition under FWM imaging and high photostability compared to fluorescent dyes.
• PE-FWM imaging demonstrates reduced interference from off-resonant species and antifade properties, suitable for long-term cell monitoring.

Conclusions:

• The PE-FWM imaging technique offers a powerful tool for analyzing cell heterogeneity based on surface receptors.
• This technology opens emerging applications in single-cell analysis, bioimaging, and metabolite/drug tracing.
• The technique holds significant potential for broad applications in biology and medicine.