The effect of temperature on electrochemically driven denaturation monitored by SERS

Area of Science:

• Electrochemistry
• Biophysics
• Spectroscopy

Background:

• DNA denaturation is crucial for molecular biology.
• Electrochemical methods offer precise control over biomolecular interactions.
• Surface-enhanced Raman spectroscopy (SERS) provides sensitive molecular fingerprinting.

Purpose of the Study:

• To investigate the effect of temperature on electrochemically driven DNA melting (E-melting).
• To assess the applicability of E-melting for DNA analysis across different temperatures.

Main Methods:

• Immobilizing double-stranded DNA (dsDNA) on a nanostructure gold electrode.
• Monitoring DNA denaturation using SERS as electrochemical potential is scanned negatively.
• Conducting experiments across a temperature range of 10–28 °C with two distinct DNA duplexes.

Main Results:

• Significant temperature dependence of melting potentials (Em) and melting curve steepness was observed between 10 and 18 °C.
• Above 18 °C, melting potentials became independent of temperature.
• The study utilized two DNA duplexes (20 and 21 base pairs) to demonstrate these effects.

Conclusions:

• Electrically driven DNA melting (E-melting) shows temperature sensitivity below 18 °C, enabling discrimination of similar sequences.
• Above 18 °C, E-melting is temperature-insensitive, simplifying practical applications near room temperature.
• SERS is a viable technique for monitoring electrochemically induced DNA melting.