Enhanced Electrochemical Detection for DNA Hybridization on Core-Shell Magnetic Silica Sphere Gold Nanoparticles

Area of Science:

• Nanotechnology
• Electrochemistry
• Biomedical Engineering

Background:

• DNA hybridization detection is crucial for diagnostics.
• Existing methods face challenges in sensitivity and specificity.
• Nanomaterials offer potential for enhanced biosensing.

Purpose of the Study:

• To develop a novel electrochemical biosensor for DNA hybridization.
• To utilize core-shell magnetic silica sphere gold nanoparticles (MSS@AuNPs) for enhanced detection.
• To achieve high sensitivity and specificity in DNA target identification.

Main Methods:

• Synthesis and characterization of MSS@AuNPs using various spectroscopic and magnetic techniques.
• Fabrication of a gold electrode modified with MSS@AuNPs.
• Electrochemical detection of DNA hybridization using differential pulse voltammetry (DPV) and amperometry.

Main Results:

• Characterization confirmed the successful synthesis of MSS@AuNPs with specific dimensions.
• The MSS@AuNPs demonstrated excellent electron transport properties on gold electrodes.
• Highly sensitive detection of complementary DNA targets was achieved with limits as low as 0.47 ± 0.20 pM (DPV) and 0.27 ± 0.10 pM (amperometry).
• The biosensor effectively differentiated between matched, mismatched, deleted, and noncomplementary DNA sequences with high precision.

Conclusions:

• The developed MSS@AuNPs-based electrochemical biosensor offers a robust, reproducible, and stable platform for sensitive DNA detection.
• This approach advances diagnostic tools and holds promise for novel biomedical applications.