Monofunctionnal SPIO

SPIOs, or functionalised iron oxide nanoparticles

SON is currently one of the world’s leading companies in functionalised SPIO production (SPIO for Superparamagnetic Iron Oxide or USPIO for Ultrasmall Superparamagnetic Iron Oxide). 

What are SPIOs?

SPIOs are iron oxide nanoparticles with some truly fascinating properties. Their unique structure and crystallite size grant them superparamagnetic properties at room temperature. This means that iron oxide nanoparticles become magnetic when exposed to a magnetic field and cease to be so when no longer exposed.

SON has developed extensive expertise surrounding SPIOs. We currently offer a comprehensive range of iron oxide nanoparticles that can be functionalised in a variety of ways (including with carboxylic acids, amines, or chlorine).

SON’s SPIOs are highly characterised and reproducible. As a result, we can provide products of the highest quality, perfectly suited to research and development, in the volumes you need.

Choosing SON saves you time with no compromise on quality.


Monofunctional nanoparticles provide the superparamagnetism of SPIOs with an additional function (depending on the intended application).

Availability, adaptability, and variety

SON can quickly produce a wide range of SPIOs according to your needs.

Purity and quality

Our products meet stringent quality control standards. Each batch comes with a detailed certificate of analysis, which ensures consistent, reliable performance.

SON can provide the SPIOs best suited to your requirements and specifications, regardless of whether you work in a research lab or in manufacturing.