CoAl-layered double hydroxide nanosheet-based fluorescence assay for fast DNA detection

Area of Science:

• Materials Science
• Nanotechnology
• Biochemistry

Background:

• Developing sensitive and rapid DNA detection methods is crucial for diagnostics.
• Layered double hydroxides (LDHs) possess unique properties suitable for biosensing applications.
• Fluorescence quenching is a common technique for detecting biomolecules.

Purpose of the Study:

• To prepare CoAl-layered double hydroxide (CoAl-LDH) as a fluorescence quenching agent for DNA detection.
• To evaluate the efficiency, sensitivity, and biocompatibility of CoAl-LDH for DNA sensing.
• To investigate the quenching mechanisms of CoAl-LDH for single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA).

Main Methods:

• CoAl-LDH was synthesized and characterized.
• Fluorescence quenching assays were performed using FAM-labeled DNA.
• The fluorescence quenching efficiency for ssDNA and dsDNA was measured.
• The quenching mechanism was investigated by analyzing the role of phosphate groups.
• Cytotoxicity studies were conducted to assess biocompatibility.

Main Results:

• CoAl-LDH demonstrated high fluorescence quenching efficiency (88% for ssDNA, 33% for dsDNA).
• The quenching efficiency is attributed to the interaction between exposed phosphate groups in ssDNA and CoAl-LDH.
• A linear relationship was established for DNA detection in the range of 1-50 nM with a limit of detection of 0.79 nM.
• CoAl-LDH exhibited good biocompatibility in cytotoxicity studies.

Conclusions:

• CoAl-LDH is an effective, rapid, and sensitive material for DNA detection.
• The study provides insights into the design of LDH-based biosensing materials.
• CoAl-LDH offers a safe and promising approach for DNA detection applications.