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DNA Conformational Regulation in PDMS Chambers under Low-Concentration Monovalent Ionic Solutions.
Xia Wang1,2,3, Mingyan Gao1,2,3,4, Ying Wang1,3
1International Research Centre for Nano Handling and Manufacturing of China, Changchun University of Science and Technology, Changchun 130022, China.
The Journal of Physical Chemistry. B
|October 2, 2025
Summary
This study introduces a PDMS chamber to enhance DNA entanglement in low salt conditions by concentrating ions. This method enables controlled DNA morphology regulation for applications in biosensing and nanomaterials.
Area of Science:
- Biochemistry
- Materials Science
- Nanotechnology
Background:
- Monovalent alkali metal ions at low concentrations are insufficient to overcome DNA strand repulsion, hindering DNA entanglement.
- This limitation restricts DNA entanglement-based programmable assembly in low-salt environments relevant to physiology.
Purpose of the Study:
- To develop a strategy for achieving DNA entanglement and morphological regulation in low-salt conditions.
- To overcome the concentration dilemma of monovalent ions for DNA assembly.
Main Methods:
- Designed a polydimethylsiloxane (PDMS) chamber for spatiotemporal regulation of droplets.
- Utilized Raman spectroscopy to measure ion concentration enhancement and DNA conformational changes.
- Employed atomic force microscopy (AFM) to analyze DNA entanglement network density and surface coverage.
Main Results:
- The PDMS chamber enhanced Na+ concentration by approximately 18-fold within droplets, creating a high-salt microenvironment.
- Extended liquid phase retention time to 55-60 minutes, allowing for ion-mediated DNA conformational regulation.
- Confirmed denser DNA entanglement networks and higher surface coverage in PDMS-chambered droplets compared to open-surface droplets.
Conclusions:
- Developed a novel PDMS chamber strategy for effective low-concentration monovalent-ion-mediated DNA morphological regulation.
- The approach facilitates DNA entanglement in low-salt environments, overcoming previous limitations.
- Potential applications include microfluidics, biosensing, and the development of programmable nanomaterials.
