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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

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A Nanofilter Array Chip for Fast Gel-Free Biomolecule Separation.

Jianping Fu¹, Pan Mao, Jongyoon Han

¹Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.

Applied Physics Letters

|October 11, 2008

Summary

A novel nanofilter array chip enables rapid size-based separation of SDS-protein complexes and DNA molecules using Ogston sieving. This microfabricated technology offers faster molecular separations with potential for further optimization.

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Area of Science:

Biotechnology
Nanotechnology
Analytical Chemistry

Background:

Accurate size-based separation of biomolecules like proteins and DNA is crucial for various applications.
Existing separation techniques can be time-consuming or lack the required resolution for small molecules.
Microfluidic devices offer potential for miniaturized and efficient molecular separations.

Purpose of the Study:

To develop and characterize a microfabricated nanofilter array chip for size-fractionating SDS-protein complexes and small DNA molecules.
To demonstrate the efficacy of the Ogston sieving mechanism in nanofilter arrays for rapid molecular separations.
To explore the scalability and potential for enhanced performance of the nanofilter chip design.

Main Methods:

Fabrication of nanofilter arrays with controlled gap sizes ranging from 40-180 nm.
Characterization of the nanofilter arrays to assess their physical dimensions and performance.
Experimental validation of size-fractionation capabilities using SDS-protein complexes and small DNA molecules.
Application of the Ogston sieving principle for separation.

Main Results:

Complete size-fractionation of SDS-protein complexes and small DNA molecules was achieved.
Separations were accomplished within minutes over a short distance (5 mm).
The nanofilter array chip demonstrated effective separation based on the Ogston sieving mechanism.
The fabricated nanofilter arrays exhibited gap sizes between 40-180 nm.

Conclusions:

The microfabricated nanofilter array chip is a viable technology for rapid, size-based separation of biomolecules.
The Ogston sieving mechanism is effectively utilized in these nanofilter arrays for molecular fractionation.
The fabrication strategy allows for increased nanofilter density and smaller gap sizes, promising even faster separations in the future.