Photoelectrochemical imaging system with high spatiotemporal resolution for visualizing dynamic cellular responses

Area of Science:

• Biomedical Engineering
• Cell Biology
• Analytical Chemistry

Background:

• Photoelectrochemical imaging offers label-free investigation of cellular processes.
• Existing techniques often lack the speed and resolution required for dynamic cellular studies.

Purpose of the Study:

• To develop a novel, high-speed photoelectrochemical imaging system (PEIS) for live cell analysis.
• To achieve high lateral resolution and photocurrent stability for studying dynamic cellular events.

Main Methods:

• Utilized an analog micromirror for rastering the sensor substrate to enable high-speed imaging.
• Employed α-Fe2O3 (hematite) thin films synthesized via electrodeposition as a robust substrate.
• Demonstrated system capabilities by monitoring cellular responses to Triton X-100 permeabilization and pH changes.

Main Results:

• The PEIS achieved high-speed imaging with excellent lateral resolution and photocurrent stability.
• Successfully monitored dynamic cellular processes, including responses to permeabilization and pH variations.
• Attained frame rates of 8 frames per second for pH change monitoring.

Conclusions:

• The developed PEIS is a powerful tool for label-free, dynamic functional imaging of live cells.
• Simultaneous imaging of multiple cells enhances data confidence compared to slower methods.
• The system's speed and resolution are crucial for advancing the study of dynamic cellular processes.