Ultrasmall Nanoparticles for Medical Imaging Contrast
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Novel Light-Sensitive Nanoparticles for Medical Imaging
Table of Contents
What are Single-Chain Nanoparticles (SCNPs)?
A research team at Martin Luther University Halle-Wittenberg (MLU) has developed a novel class of light-sensitive nanoparticles that may one day enable new approaches to medical imaging. These particles, known as single-chain nanoparticles (scnps), consist of individually folded polymer chains. they absorb laser light and convert it into heat, thereby changing their internal structure, a process reminiscent of how proteins fold.
How do SCNPs Work?
the scientists embedded molecules of polypyrrole into the polymer chains of the SCNPs.Polypyrrole absorbs light in the near-infrared range and efficiently converts it into heat. Laser irradiation doesn’t just heat the nanoparticles; it also induces a structural change. “When exposed to light, each individual nanoparticle clumps together to form a spherical structure that is only a few nanometres in diameter. This opens up the possibility of concentrating them in specific areas of the body - precisely where there is light,” explains MLU-chemist Professor Wolfgang Binder, who led the study alongside Dr Justus Friedrich Thümmler, Professor Karsten Mäder from the Institute of pharmacy, and Professor Jan Laufer from the institute of Physics.
Thermoresponsivity and Heat Generation
SCNPs exhibit remarkable thermoresponsivity – their structure reacts to changes in temperature. This property stems from the particles’ specific molecular design, which also allows for highly efficient light-to-heat conversion. Lab experiments demonstrate that even a weak laser beam and a small number of nanoparticles can generate very high local temperatures, reaching up to 85 degrees Celsius.
Potential Applications in Medical Imaging and Therapy
The ability to concentrate nanoparticles in specific areas using light, combined with their heat-generating capabilities, opens up exciting possibilities. Potential applications include:
- Targeted drug Delivery: Heating could trigger the release of drugs encapsulated within or attached to the nanoparticles.
- Photothermal Therapy: Localized heating could destroy cancerous cells without damaging surrounding healthy tissue.
- Enhanced Medical Imaging: The structural changes induced by light could be used to improve contrast in imaging techniques.
Research Team and Publication
The research was led by Professor Wolfgang Binder (MLU-chemist) in collaboration with Dr Justus Friedrich Thümmler, Professor Karsten Mäder (Institute of Pharmacy), and Professor Jan Laufer (Institute of Physics). The findings were published in the journal communications Chemistry.