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Effect of surface nanotopography on immunoaffinity cell capture in microfluidic devices
Bu Wang1, Alex L Weldon, Pisist Kumnorkaew
1Department of Materials Science and Engineering, Lehigh University, 5 E. Packer Avenue, Bethlehem, Pennsylvania 18015, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 2, 2011
Summary
Surface nanotopography significantly impacts immunoaffinity cell capture efficiency in microfluidic devices. Optimizing nanoparticle size and arrangement is crucial for enhancing cell isolation from biological fluids.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Materials Science
Background:
- Immunoaffinity microfluidic devices are widely used for cell isolation.
- Surface nanotopography is employed to enhance cell capture efficiency.
- Quantitative correlations between nanopatterns and cell immobilization are lacking.
Purpose of the Study:
- To systematically investigate the relationship between surface nanotopography and immunoaffinity cell capture efficiency.
- To determine how varying nanoparticle sizes affect CD4+ T cell capture in microfluidic channels.
Main Methods:
- Fabrication of microfluidic devices with functionalized silica nanobead arrays (100-1150 nm diameters).
- Immobilization of specific antibodies onto nanostructured surfaces.
- Continuous flow capture of CD4+ T cells under varying flow rates.
Main Results:
- Cell capture efficiency generally increases with nanoparticle size at low flow rates.
- At higher flow rates, efficiency initially increases with bead size, then decreases.
- Capture yield showed unexpected dips at certain bead sizes, suggesting dynamic membrane-nanostructure interactions.
Conclusions:
- Surface nanotopography plays a critical role in immunoaffinity cell capture efficiency.
- Optimizing nanobead size and arrangement can improve microfluidic cell isolation.
- Understanding dynamic interactions is key to designing effective microfluidic capture beds.
