Microfluidic cytometer based on dual photodiode detection for cell size and deformability analysis.

Area of Science:

• Biophysics
• Cell Biology
• Microfluidics

Background:

• Cellular mechanical properties are crucial for disease diagnosis.
• Label-free cell distinction based on mechanics offers diagnostic potential.

Purpose of the Study:

• To develop a low-cost microfluidic cytometer for studying cell mechanical properties and size.
• To demonstrate label-free cell differentiation using mechanical properties.

Main Methods:

• A microfluidic chip with a narrow channel was fabricated using polydimethylsiloxane.
• A commercial laser and two photodiodes were used to measure cell transit time and transmission intensity.
• HL60 cells treated with and without Cytochalasin D, and HL60 cells versus red blood cells were analyzed.

Main Results:

• The microfluidic cytometer effectively measured cell mechanical properties and size.
• Differences in mechanical properties between treated and untreated HL60 cells were identified.
• Distinct cell types (HL60 cells and red blood cells) were successfully differentiated based on size and mechanical properties.

Conclusions:

• The developed microfluidic cytometer is a convenient and low-cost tool for label-free cell analysis.
• Measuring cellular mechanics and size provides a viable method for distinguishing between cell types and conditions.
• This technology holds promise for applications in disease diagnosis and cell characterization.