Label-Free Detection of DNA Supramolecular Structure Formation by Surface-Enhanced Raman Spectroscopy

Area of Science:

• Nanotechnology
• Biochemistry
• Spectroscopy

Background:

• Precise self-assembly of DNA molecules enables the creation of advanced supramolecular materials at the nanoscale.
• Characterization challenges hinder the development of complex DNA supramolecular materials.
• Surface-enhanced Raman spectroscopy (SERS) is limited in analyzing complex DNA supramolecular structures.

Purpose of the Study:

• To develop a modified SERS-based platform for characterizing DNA supramolecular materials.
• To overcome limitations in analyzing complex DNA supramolecular information using SERS.
• To provide detailed structural insights into DNA supramolecular assemblies.

Main Methods:

• Development of a silver nanoparticle-enhanced SERS substrate.
• Utilized acetonitrile as an internal standard and modifier.
• Employed calcium ions as an aggregating agent to form stable silver nanoparticle hotspots.

Main Results:

• Achieved perpendicular orientation of DNA supramolecular base planes to the substrate surface.
• Obtained enhanced Raman signals from DNA supramolecular base rings for the first time.
• Successfully characterized the structure of DNA supramolecules using the modified SERS platform.

Conclusions:

• The developed SERS platform offers a powerful tool for structural analysis of DNA supramolecular materials.
• This technique demonstrates significant potential for analyzing nucleic acids and their ligands.
• Advances in SERS enable detailed structural elucidation of complex DNA assemblies.