Discrimination and analysis of phytoplankton using a microfluidic cytometer

Area of Science:

• Marine biology
• Environmental science
• Biotechnology

Background:

• Phytoplankton analysis is crucial for understanding ocean health, pollution, and climate change.
• Conventional microscopy is labor-intensive; flow cytometry is costly and lacks portability.

Purpose of the Study:

• To develop a microfluidic (lab-on-a-chip) device for high-speed, single-cell phytoplankton analysis.
• To integrate fluorescence and electrical impedance measurements for enhanced characterization.

Main Methods:

• Fabrication of a microfluidic device for single-particle analysis.
• Measurement of fluorescence (three wavelength ranges) and electrical impedance.
• Testing with a mixture of three algae species (Isochrysis Galbana, Rhodosorus m., Synechococcus sp.).

Main Results:

• The microfluidic flow cytometer successfully distinguished and characterized different phytoplankton taxa.
• Impedance spectroscopy enabled the measurement of phytoplankton biophysical properties.
• Results aligned with theoretical predictions and commercial flow cytometer measurements.

Conclusions:

• The developed microfluidic device provides a viable, high-speed alternative for phytoplankton analysis.
• Integration of impedance spectroscopy offers new insights into phytoplankton biophysical characteristics.
• This technology has potential applications in environmental monitoring and marine research.