Active and biomimetic nanofilters for selective protein separation.

Area of Science:

• Biomimetic engineering
• Nanotechnology
• Molecular separation science

Background:

• Cell and nuclear membranes utilize selective protein channels for molecular transport.
• Channel selectivity is governed by attractive potentials within transmembrane proteins.
• Existing methods struggle with precise separation of molecules with similar properties.

Purpose of the Study:

• To develop a biomimetic facilitated transport system for selective molecular separation.
• To mimic the precise filtering capabilities of biological membrane channels.
• To create a versatile platform for molecular enrichment in complex samples.

Main Methods:

• Immobilization of specific antibodies within 15 nm diameter polycarbonate nanochannels to create attractive potentials.
• Utilizing two proteins with similar physicochemical properties (Bovine Serum Albumin, 66 kDa; Human Hemoglobin, 65 kDa) as model molecules.
• Demonstrating separation of protein mixtures at various ratios (1:1, 1:20, 1:40 Hb:BSA).

Main Results:

• Successful selective separation of Human Hemoglobin (Hb) and Bovine Serum Albumin (BSA) was achieved.
• The nanochannel system demonstrated high selectivity, separating proteins with similar molecular weights.
• Selectivity was tunable, switching from Hb to BSA separation by altering the immobilized antibody.

Conclusions:

• The developed biomimetic facilitated transport modality effectively separates target molecules from mixtures.
• This antibody-functionalized nanochannel system offers a precise and switchable method for molecular enrichment.
• The approach holds promise for enhancing signal-to-noise ratios in early disease diagnosis by concentrating biomarkers.