Cisplatin-based DNA sensing with enhanced current response.

Area of Science:

• Electrochemistry
• Biochemistry
• Analytical Chemistry

Background:

• Electrochemical methods are crucial for sensitive biomolecule detection.
• Cisplatin is a platinum-based chemotherapy drug with known DNA-binding properties.
• Developing novel electrochemical sensors for DNA quantification is an active area of research.

Purpose of the Study:

• To develop a novel and highly sensitive electrochemical technique for DNA detection.
• To utilize the interaction between cisplatin and DNA for quantitative analysis.
• To establish a new method for measuring DNA content using electrochemistry.

Main Methods:

• A simple electrochemical setup combining cisplatin and a glassy carbon electrode was employed.
• The interaction of cisplatin with DNA was studied via electrochemical reduction.
• DNA content was determined by measuring the suppression of cisplatin electroreduction and subsequent catalytic proton reduction.

Main Results:

• Complexation of cisplatin with DNA suppressed the electroreduction of cisplatin due to steric hindrance.
• A catalytic current for proton reduction, mediated by platinum nanoparticles, was observed.
• The DNA content was accurately determined from the decrease in the electrode's catalytic activity.
• A highly sensitive measurement was achieved, with a detection limit of 0.1 ng/mL for herring DNA.

Conclusions:

• A novel electrochemical DNA detection method based on cisplatin and a glassy carbon electrode was successfully developed.
• The method leverages the suppression of cisplatin electroreduction and enhanced catalytic proton reduction for sensitive DNA quantification.
• This technique provides a promising approach for highly sensitive DNA detection in biological and environmental samples.