Electrochemical biosensor system using a CMOS microelectrode array provides high spatially and temporally resolved...

Area of Science:

• Life Sciences
• Biotechnology
• Neuroscience

Background:

• Real-time visualization of biological events is crucial for life science research.
• Understanding chemical communication is key to cell behavior, complementing anatomical studies.

Purpose of the Study:

• To describe a novel electrochemical imaging system for capturing real-time chemical gradients in live tissue slices.
• To demonstrate the system's capability for high-resolution chemical analysis in biological samples.

Main Methods:

• Development of a system integrating a CMOS microchip with 8192 electrodes, on-chip potentiostat, and microfluidics for ex vivo tissue experimentation.
• Detailed description of data processing, sensor calibration, microfluidics fabrication, and tissue preparation.
• Proof-of-concept using norepinephrine as a target analyte.

Main Results:

• The system can differentiate norepinephrine concentrations from 8 µM to 1024 µM with a linear response.
• Achieved spatial resolution of 25.5 µm × 30.4 µm.
• Successfully visualized caffeine-stimulated catecholamine release from live murine adrenal tissue slices with temporal sensitivity.

Conclusions:

• The developed electrochemical imaging system offers high spatiotemporal resolution for analyzing chemical gradients in live tissues.
• This technology enables parallel gathering of chemical gradient information alongside optical microscopy.
• The system represents a significant advancement for studying cellular chemical communication in real time.