Separation of Lung Cancer Cells From Mixed Cell Samples Using Aptamer-Modified Magnetic Beads and Permalloy...

Area of Science:

• Biotechnology
• Microfluidics
• Cancer Research

Background:

• Microfluidic devices offer precise cell manipulation.
• Effective isolation of circulating tumor cells is crucial for cancer diagnosis.

Purpose of the Study:

• To design and fabricate a microfluidic chip for lung cancer cell separation.
• To evaluate the impact of magnetic bead size on separation efficiency.

Main Methods:

• Fabrication of a microfluidic chip with integrated permalloy micromagnets.
• Utilizing aptamer-modified magnetic beads (MBs) of varying sizes (1.36–4.50 µm) for cell capture.
• Assessing separation efficiency based on cell ratios in chip outlets and inlets.

Main Results:

• Initial overall separation efficiencies ranged from 43.4% to 50.2%.
• Larger MBs showed increased effective separation efficiencies (71.6%–79.4%) after accounting for inlet accumulation.
• Contrary to initial predictions, larger MBs demonstrated superior performance due to stronger magnetic interaction.

Conclusions:

• The microfluidic chip effectively separates lung cancer cells using magnetic beads.
• Larger magnetic beads enhance effective separation efficiency, despite initial observations of decreased overall efficiency.
• This technology holds promise for clinical applications in cancer diagnostics.