Fluorescence dye-conjugated magnetic core-shell silica nanoparticles for enhanced nucleic acid visualization

Area of Science:

• Materials Science
• Nanotechnology
• Biotechnology

Background:

• Traditional fluorescent dyes for nucleic acid detection, like ethidium bromide (EB), face challenges including toxicity, high cost, and low sensitivity.
• Existing alternatives often retain some of these drawbacks, hindering progress in nucleic acid analysis.

Purpose of the Study:

• To develop a novel, neutral fluorescent magnetic core-shell nanoparticle dye.
• To create a safer, more sensitive, and cost-effective alternative to ethidium bromide for nucleic acid detection.

Main Methods:

• Synthesized Fe2O3 nanoparticles coated with a silica shell.
• Conjugated silica-coated nanoparticles with coumarin dyes (C4, C7) and fluorescein (Flu).
• Characterized nanoparticles using TEM, XRD, TGA, UV-vis, and fluorescence spectroscopy; evaluated DNA visualization via agarose gel electrophoresis.

Main Results:

• Successfully synthesized and characterized novel magnetic core-shell nanoparticles (NpFeSi) conjugated with fluorescent dyes.
• DNA-C7@NpFeSi showed a 2-fold increase in fluorescence intensity compared to free C7@NpFeSi.
• DNA-Flu@NpFeSi exhibited a ~10-fold fluorescence intensity increase and distinct DNA band visualization (50-10,000 bp) with efficient magnetic separation.

Conclusions:

• The developed DNA-Flu@NpFeSi nanoparticle dye is a highly sensitive, low-toxicity, and cost-effective alternative to ethidium bromide.
• These novel nanoparticles offer efficient nucleic acid visualization and magnetic separation capabilities.
• The study demonstrates the potential of core-shell magnetic nanoparticles for advanced nucleic acid detection applications.