Flow-system measurement of cell impedance properties

Area of Science:

• Biotechnology
• Electrical Engineering
• Cell Biology

Background:

• Traditional cell analysis methods often lack detailed electrical property measurements.
• Understanding cell membrane capacitance and internal resistivity is crucial for cell characterization.

Purpose of the Study:

• To develop a novel flow-system technique for detecting high-frequency resistance and capacitance changes in cells.
• To relate measured electrical impedance changes to specific cellular properties like size and internal resistivity.
• To describe a prototype instrument capable of simultaneous electrical impedance measurements.

Main Methods:

• A flow-system technique was developed to measure resistance and capacitance changes in a sensing orifice.
• The technique detects impedance changes caused by individual cell passage.
• A prototype instrument was built to simultaneously measure dc Coulter volume and two ac impedance parameters.

Main Results:

• The developed technique successfully detected resistance and capacitance changes related to cell passage.
• Measured impedance changes correlate with cellular properties such as size, plasma membrane capacitance, and internal resistivity.
• Initial tests with microspheres and Chinese hamster ovary cells demonstrated the instrument's capability.

Conclusions:

• The flow-system impedance technique provides a comprehensive method for cell characterization.
• Simultaneous measurement of dc and ac electrical parameters offers deeper insights into cell properties.
• The prototype instrument shows promise for advanced cell analysis applications.