Constructing a Nanopipette-Based DNA Electromechanical Device

Area of Science:

• Nanotechnology and Nanoscience
• Biophysics and Molecular Biology
• Analytical Chemistry

Background:

• Solid-state nanopore and nanopipette sensors are crucial for analyzing biopolymers like DNA and proteins.
• Current methods require analyzing numerous molecules for statistically significant data, limiting sensor applicability and workflow efficiency.
• A need exists for methods that allow repeated analysis of individual biopolymer structures.

Purpose of the Study:

• To develop a novel strategy for trapping DNA structures within the sensing region of a nanopipette.
• To enable repeated, high-resolution analysis of individual DNA molecules.
• To enhance the utility and applicability of nanopipette sensing technology.

Main Methods:

• End-functionalization of DNA structures.
• Nanoparticle capping of functionalized DNA.
• Trapping nanoparticle-DNA constructs within a nanopipette tip.
• Development of descriptors to characterize construct insertion and presence.
• Assessment of construct mobility and responsiveness to electric fields.

Main Results:

• A robust method for trapping DNA structures in nanopipettes via nanoparticle capping was successfully developed.
• Descriptors were established to effectively characterize nanoparticle-DNA constructs within the nanopipette.
• The trapped DNA constructs demonstrated sustained mobility and responsiveness to electric fields, allowing for prolonged sensing.

Conclusions:

• The end-functionalization and nanoparticle capping strategy effectively immobilizes DNA structures in nanopipettes for sensing.
• This approach facilitates repeated readout of the same DNA structure, significantly improving data acquisition efficiency.
• The method opens avenues for new applications, including in-flow sensing and analysis within confined environments.