Magnetofluorescent Nanoprobe for Multimodal and Multicolor Bioimaging

Area of Science:

• Nanotechnology
• Biomedical Imaging
• Materials Science

Background:

• Superparamagnetic iron oxide nanoparticles (SPIONs) are widely used as MRI contrast agents.
• Their application as multimodal probes is limited by lack of fluorescence and larger particle size.
• This restricts their use in light microscopy and imaging of small cellular structures.

Purpose of the Study:

• To synthesize ultrasmall carbon-containing SPIONs with magneto-fluorescent properties.
• To evaluate their efficacy as multicolor imaging probes for cell lines.
• To explore their potential for advanced super-resolution microscopy.

Main Methods:

• Synthesis of ultrasmall (∼5 nm) carbon-containing SPIONs.
• Multicolor imaging of MCF-7 and HeLa cell lines using the synthesized SPIONs.
• Photon count analysis at the single-particle level.

Main Results:

• Successfully synthesized ultrasmall carbon-containing SPIONs (∼5 nm).
• Demonstrated multicolor imaging capability of the SPIONs in cell lines, covering blue to red spectrum.
• High contrast imaging of the cytoplasm was achieved.
• Single-particle photon count data indicates suitability for super-resolution microscopy.

Conclusions:

• Ultrasmall carbon-containing SPIONs offer a novel solution for multimodal bioimaging.
• These nanoparticles overcome limitations of traditional SPIONs in fluorescence and size.
• The developed SPIONs show promise for future applications in super-resolution microscopy.