Scientists from Clemson University Materials Science & Engineering and several international collaborators — Md. Shamiull Alim Munna, Md. Mazharul Islam, Mohammad Ahasanur Rabbi, O. Thompson Mefford (MSE), Alexander Malaj (Mefford Group), Md. Shahidul Islam, Hasan Ahmad, and Md. Mahbubor Rahman — recently published a study in RSC Advances that combines magnetism and fluorescence into a single nanoparticle tool.
Making magnetic and glowing particles
The researchers created tiny iron oxide (Fe₃O₄) particles, each only billionths of a meter wide. They coated them with silica (SiO₂) for protection and then attached a fluorescent dye called FITC, making “Fe₃O₄@SiO₂@FITC” particles. The silica layer helps the dye stick while keeping the magnetic core stable. These nanoparticles can be pulled by a magnet and glow green under light — perfect for both collecting and observing DNA samples.
How they tested them
To check how well the nanoparticles could capture DNA, the team placed them in DNA solutions with different acidity levels (pH). They discovered that the particles performed best at pH 4.44, where about 91% of the DNA attached to them. A version with added amine groups also worked well, though its performance dropped as the solution became more basic.
They used UV-Visible and fluorescence spectroscopy to watch the process in real time. As more DNA bound to the nanoparticles, their glow dimmed — showing that the light itself could act as a built-in signal for DNA collection.
Why it matters
This dual-function design could make DNA extraction faster and more efficient for lab work, medical testing, or even environmental studies. Instead of using multiple materials to separate and detect DNA, one multifunctional nanoparticle could do both. It’s a smart example of how materials science and chemistry can merge to solve biological problems.
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