Scanning Electron Microscopy images of PS-MAG-COOH particles (360 nm)

Nominal 1µm superparamagnetic silica particles (Scanning Electron Microscopy image, by courtesy of Dr. M. Wagener, Carl Zeiss NTS GmbH)

Fluorescence micrograph of magnetic polystyrene particles with streptavidin-coating, visualized by FITC-Biotin

MicroParticles GmbH offers its customers a series of newly developed magnetic spheres in the diameter range from 300 nm through 50 microns. The particle matrix consists of either polystyrene or silica with homogeneously incorporated nanometer-sized iron oxide. Special surface coatings encapsulate the particles towards surrounding media thus preventing the leaching of iron species.
Outstanding properties of the new magnetic microspheres of microParticles GmbH are:

• Narrow size distribution (CV <5%) and absolutely spherical shape.
• Superparamagnetic.
• The iron oxide content can be adjusted in a wide range up to 50 wt.-%.
• The special surface coating minimizes aggregation in aqueous suspension and non-specific binding of proteins and nucleic acids.

The currently available spectrum of monodisperse superparamagnetic particles is listed in the product tables as given below:

Superparamagnetic particles:
(Click "Table"-buttons to view the complete particle spectrum or enter your desired particle diameter in µm.)

Paramagnetic polystyrene particles (PS-MAG)
Carboxyl-functionalized paramagnetic polystyrene particles (PS-MAG-COOH)
Streptavidin-modified paramagnetic polystyrene particles (PS-MAG-SA)
Paramagnetic silica particles (SiO2-MAG)
Carboxyl-functionalized paramagnetic silica particles (SiO2-MAG-COOH)
Streptavidin-modified paramagnetic silica particles (SiO2-MAG-SA)
Pack sizes: Aqueous dispersions (25 mg/ml): 5 ml, 10 ml, 15 ml (MAG, 0,3 - 0,99 µm) (50 mg/ml): 5 ml, 10 ml, 15 ml (MAG, 1 - 10 µm) Aqueous dispersions (25 mg/ml): 5 ml, 10 ml, 15 ml (MAG-COOH, 0,3 - 0,99 µm) (50 mg/ml): 5 ml, 10 ml, 15 ml (MAG-COOH, 1 - 10 µm) Aqueous dispersions (10 mg/ml): 1 ml, 5 ml, 10 ml (MAG-SA, 0,3 - 10 µm) -> Other modifications (proteins, oligonucleotides) and particle diameters than listed in the tables upon request.