LTCC Packaged Ring Oscillator Based Sensor for Evaluation of Cell Proliferation.

Area of Science:

• Biomedical Engineering
• Materials Science
• Cell Biology

Background:

• Cell viability monitoring is crucial for drug development and disease research.
• Existing methods for cell monitoring can be complex or lack real-time capabilities.
• Complementary metal-oxide-semiconductor (CMOS) technology offers potential for miniaturized biosensor development.

Purpose of the Study:

• To develop a CMOS chip biosensor for real-time cell viability monitoring.
• To investigate the relationship between cell adhesion and sensor response.
• To assess the biosensor's performance in tracking cell proliferation and detachment.

Main Methods:

• Fabrication of a CMOS chip biosensor with capacitance sensors and a ring oscillator.
• Packaging the chip in a low temperature co-fired ceramic (LTCC) module using flip chip bonding.
• Utilizing a microcontroller and PC for system operation and measurement control.
• Testing the biosensor with human lung epithelial cells (BEAS-2B) to monitor proliferation and detachment.

Main Results:

• The biosensor detected changes in cell adhesion, which altered effective permittivity and sensor oscillation frequency.
• A frequency shift of 1.1 MHz from a base frequency of 57.2 MHz was observed due to cell presence.
• The sensor response (frequency shift) was directly proportional to the number of cells near the sensor.

Conclusions:

• The developed CMOS biosensor effectively monitors cell viability and proliferation based on cell adhesion.
• The biosensor provides a sensitive and label-free method for real-time cell monitoring.
• This technology has potential applications in drug screening, toxicology, and fundamental cell biology research.