Particles small angle forward-scattered light measurement based on photovoltaic cell microflow cytometer

Area of Science:

• Biophotonics
• Microfluidics
• Analytical Chemistry

Background:

• Microparticle detection is crucial in medical diagnostics, environmental monitoring, and biological research.
• Existing microflow cytometry methods face challenges in sensitivity and cost-effectiveness.

Purpose of the Study:

• To develop and validate a cost-effective microflow cytometer for microparticle detection.
• To investigate the influence of scattering angle and laser power on detection performance.

Main Methods:

• A microflow cytometer was designed using a commercial photovoltaic cell, adjustable laser module, and PDMS microfluidic chip.
• Small angle forward-scattered light measurements were employed for detection.
• Detection performance was evaluated using standard particles (5-15 μm) under varying laser powers (15-25 mW) and scattering angles (5°, 8°).

Main Results:

• Signal-to-noise ratio (S/N) increased with reduced scattering angle and increased laser power.
• Forward-scattered light intensity showed a linear correlation (R² ≈ 0.96) with particle size.
• Coefficient of Variation (CV) for light intensity remained within 20-30%.

Conclusions:

• The proposed microflow cytometer effectively detects microparticles using forward-scattered light.
• The device offers a promising, cost-effective solution for microparticle analysis in diverse scientific fields.
• Optimized laser power and scattering angle enhance detection sensitivity and linearity.