Researchers at UC Davis have created new types of nanoparticle that could be used in tests for environmental pollution or contamination of food products, and for medical diagnostics.
The particles, about 100 to 200 nanometres in size, are luminescent, magnetic and inexpensive to make, and can be tagged with antibodies. They are made up of a magnetic core of iron oxide or iron/neodymium/cobalt oxide coated in a shell of europium and gadolinium oxide. When stimulated with a laser, europium emits red light at a very specific wavelength.
The nanoparticles can be manipulated with magnets and detected by fluorescence. They could also be labelled with other fluorescent labels in different colours, or used as part of an assay with other fluorescent labels. The built-in europium luminescence acts as an internal standard, making it easier to carry out accurate quantitative assays, said Ian Kennedy, professor of mechanical and aeronautical engineering and senior author on a paper describing the work.
The particles can also be coated with short pieces of DNA and used for genetic analysis. The team is exploring uses including testing for bioterrorism agents such as ricin or botulinum toxin in food and for genetic tests in cancer medicine.
The nanoparticles were made by spray pyrolysis, which involves mixing the raw material in a solvent and spraying it through a flame. The method is much cheaper than the techniques previously used for making similar particles, and can readily be scaled up to industrial production. It is already used in the chemical industry to make products such as fumed silica and carbon black.
I think the developed luminescent and magnetic nanoparticles are of a great scientific interest and significance for biomedical application. We develop also polymeric and hybrid (including magnetic ones) luminescent nanoparticles for labelling and separation of proteins and pathological cells.
However, our approach consists in tailored synthesis of water soluble surface-active functional oligoperoxide complexes of rare earth metal cations (Ce, Eu, Nd etc). They can interact with biopolymers or cell membranes, provide homogeneous nucleation and simultaneous functionalization of monodispersed polymeric or Ni, ferric oxide nanoparticles. We tested them for phagocytosis study as well as for apoptic cell binding.
Alexander Zaichenko,
Associate Professor of
Lviv Polytechnic National University, Ukraine,
e-mail: zaichenk@polynet.lviv.ua