An Efficient Electrochemiluminescence Biosensor Based on Ru(bpy)₃²⁺@AuNPs@SWCNTs for miRNAs Detection Using a Dual...

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Analytical Chemistry

Background:

• Acute pancreatitis diagnosis is challenging, often leading to delayed treatment and poor outcomes.
• Existing diagnostic methods have limitations, necessitating innovative strategies for early detection.
• Electrochemiluminescence (ECL)-based biosensors offer a sensitive, cost-effective, and user-friendly approach for disease diagnostics.

Purpose of the Study:

• To develop an advanced ECL biosensor for the sensitive and specific detection of miRNA24-3p, a biomarker for acute pancreatitis.
• To engineer a DNA-based nanostructure with enhanced motion control and signal regulation for improved biosensor performance.
• To validate the potential of this novel biosensor platform for early clinical diagnosis of acute pancreatitis.

Main Methods:

• Designed an ECL biosensor incorporating a DNA tetrahedron scaffold, a double swing arm mechanism, and a track-based signal regulation system.
• Utilized ferrocene (Fc) as a signal quencher, with signal restoration upon binding to miRNA24-3p.
• Employed a composite luminescent material (Ru(bpy)₃²⁺@AuNPs@SWCNTs) and persulfate as a coreactant.

Main Results:

• Achieved an ultralow detection limit of approximately 60 aM for miRNA 24-3p over a wide dynamic range (10^-15 M to 10^-6 M).
• Demonstrated excellent specificity, reproducibility, and stability of the developed ECL biosensor.
• The DNA walker system exhibited enhanced operating efficiency and controllability.

Conclusions:

• The novel ECL biosensor platform shows significant potential for revolutionizing the clinical diagnosis of acute pancreatitis.
• This technology enables more timely and accurate interventions, improving patient outcomes.
• The study highlights advancements in DNA nanotechnology for developing next-generation diagnostic tools.