Highly localized chemical sampling at sub-second temporal resolution enabled with a silicon nanodialysis platform at...

Area of Science:

• Biomedical Engineering
• Neuroscience
• Materials Science

Background:

• Microdialysis (MD) is a key technique for chemical profiling in various biological systems.
• Existing MD methods face limitations in sensitivity, spatial, and temporal resolution due to inherent tradeoffs.
• Applications span neuroscience, dermatology, ophthalmology, and pain research.

Approach:

• Developed a nanodialysis (ND) sampling probe using wafer-scale silicon microfabrication.
• Engineered a 100X reduction in microfluidic channel cross-section and flow rates (nL/min).
• Integrated a nanometer-thin nanoporous membrane with high transport flux.

Key Points:

• Achieved 100μm spatial resolution and sub-second temporal resolution.
• Demonstrated 100X-1000X improvement in performance metrics compared to traditional MD.
• Maintained high recovery rates for sampled analytes.

Conclusions:

• Miniaturized ND probes enable minimally invasive, highly localized chemical sampling.
• Offers unprecedented spatio-temporal resolution for live biological tissues.
• Potential for significant advancements in clinical, biomedical, and pharmaceutical research.