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Protein preconcentration using nanofractures generated by nanoparticle-assisted electric breakdown at junction gaps
Chun-Ping Jen1, Tamara G Amstislavskaya2, Chen-Chi Kuo1
1Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-Tech Innovations, National Chung Cheng University, Chia Yi, Taiwan, R.O.C.
Plos One
|July 16, 2014
Summary
This study introduces nanofractures for protein preconcentration, achieving a 1.5×10(4)-fold increase from 1 nM concentrations in 60 minutes using the exclusion-enrichment effect.
Area of Science:
- Analytical Chemistry
- Nanotechnology
- Biophysics
Background:
- Sample preconcentration is crucial for accurate detection of low-concentration analytes.
- Concentration polarization in nanofluidic channels induces nonlinear electrokinetic flow.
- The exclusion-enrichment effect facilitates protein accumulation via this flow.
Purpose of the Study:
- To develop a novel method for protein preconcentration using nanofractures.
- To investigate the exclusion-enrichment effect for efficient sample concentration.
- To fabricate a cost-effective preconcentration chip using soft lithography.
Main Methods:
- Fabrication of a polydimethylsiloxane (PDMS) chip using soft lithography.
- Creation of nanofractures via nanoparticle-assisted electric breakdown.
- Utilizing electroosmotic flow to drive protein samples and induce exclusion-enrichment.
Main Results:
- Successful fabrication of a protein preconcentration chip with integrated nanofractures.
- Demonstration of significant protein accumulation through the exclusion-enrichment effect.
- Achieved a 1.5×10(4)-fold concentration of a 1 nM protein sample in 60 minutes.
Conclusions:
- Nanofractures effectively enhance protein preconcentration via the exclusion-enrichment effect.
- The nanoparticle-assisted electric breakdown method lowers the required voltage for nanofracture formation.
- The developed chip offers a sensitive and efficient platform for analyzing low-concentration protein samples.
