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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

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Published on: October 31, 2013

Bioconjugation-induced ionic current rectification in aptamer-modified single cylindrical nanopores.

Mubarak Ali¹, Saima Nasir, Wolfgang Ensinger

¹Technische Universität Darmstadt, Fachgebiet Materialanalytik, Alarich-Weiss-Str. 2, D-64287 Darmstadt, Germany. m.ali@gsi.de.

Chemical Communications (Cambridge, England)

|January 29, 2015

Summary

Conjugating aptamers and proteins in nanopores creates uneven charges, resulting in ionic current rectification. This finding is crucial for developing advanced nanopore sensing technologies.

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Area of Science:

Biophysics
Nanotechnology
Molecular Engineering

Background:

Single nanopores are critical for molecular detection.
Controlling charge distribution within nanopores is essential for ionic current modulation.
Aptamer-protein conjugates offer unique functionalities for biosensing applications.

Purpose of the Study:

To investigate the impact of aptamer-protein conjugation on charge distribution within a single nanopore.
To explore the resulting ionic current rectification characteristics.
To understand the fundamental mechanisms governing charge effects in confined environments.

Main Methods:

Fabrication of single cylindrical nanopores.
Conjugation of aptamers with target proteins within the nanopore.
Measurement of ionic current flow and analysis of rectification phenomena.

Main Results:

Observed non-homogeneous fixed charge distribution upon aptamer-protein conjugation.
Demonstrated emergence of significant ionic current rectification.
Correlated charge distribution with observed rectification behavior.

Conclusions:

Aptamer-protein conjugation within confined nanopore environments induces ionic current rectification.
This phenomenon arises from non-homogeneous charge distributions.
The findings pave the way for novel nanopore-based devices with tunable ionic transport properties.