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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores
Published on: October 31, 2013
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Detection and Separation of Single-Stranded DNA Fragments Using Solid-State Nanopores.
Lijian Zhan1, Yin Zhang1, Wei Si1
1Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China.
The Journal of Physical Chemistry Letters
|July 9, 2021
Summary
This study introduces a solid-state nanopore platform for label-free separation of short single-stranded DNA (ssDNA) fragments. The platform uses size-tunable nanopores to selectively sort ssDNA based on length, achieving up to 30nt selectivity.
Area of Science:
- Nanotechnology
- Molecular Biology
- Biophysics
Background:
- Effective sorting of DNA fragments is crucial for various biological assays.
- Current methods for DNA fragment separation can be complex and lack sensitivity.
Purpose of the Study:
- To demonstrate a solid-state nanopore platform for label-free detection and separation of short single-stranded DNA (ssDNA) fragments.
- To investigate the length-dependent translocation behaviors of ssDNA through nanopores.
Main Methods:
- Utilized a solid-state nanopore platform with size-tunable pores.
- Experimentally analyzed the translocation of ssDNA fragments (<100 nt) under an electric field.
- Performed numerical simulations to understand translocation dynamics.
Main Results:
- Demonstrated that each pore size has a specific passable length threshold for ssDNA translocation.
- Showcased controllable selectivity of ssDNA separation by tuning nanopore size, with selectivity up to 30nt.
- Numerical simulations revealed that electroosmosis and electrophoresis govern ssDNA translocation direction.
Conclusions:
- Solid-state nanopore platforms offer a promising approach for label-free ssDNA separation based on length.
- Nanopore size is a critical parameter for achieving selective ssDNA sorting.
- Understanding the interplay of electrokinetic forces is key to optimizing ssDNA translocation control.
