Magnetic silica beads that we can offer are: embedding type and core shell type. The former is prepared by embedding the magnetic nanoparticles(Fe3O4 nanoparticles) in the silica microspheres and the later is by coating silica core with a layer of magnetic particles. By chemical modification, magnetic silica microspheres can link with various functional groups as well as special antibody, protein, and nucleic acid which make magnetic silica microspheres widely used in the industries of DNA/RNA/ nucleic acid purification, cell screening, immunoassay, clinical diagnosis and other various fields. The functions of separation and purification make magnetic silica beads essential in the scientific research of medical industry and molecular biology.

Items	Type	Matrix	APS	Surface Groups	Unit
Magnetic Silica Beads	Embedding/Core Shell	SiO2	0.1-1um， 1-2um， 2-3um， 3-4um， 4-5um， 5-6um， 6-7um	-NH2,-COOH, -Epoxy, -SiOH	100mg/10ml

1: Magnetic Silica Beads—Embedding type
a.Appearance
The suspension of silica coated magnetic beads are yellowish-brown. The structure of embedding type magnetic SiO2 microspheres is that Fe3O4 magnetic nanoparticles embedded in the monodisperse silica microspheres. The dispersant is phosphate buffer. It has good monodispersity and magnetic response. Sedimentation will happen after long time unused. Before use, shake or ultrasonic dispersion is suggested.
b.Features
Strong magnetic response （ Bs 27.2 emu/g ）
High mechanical and chemical stability
0.1-5 μm are available
2: Magnetic Silica Beads-Core shell type
a.Apperance
The core shell type magnetic silica microspheres are brown suspension. The structure of core shell type is with monodisperse silica microspheres coated by a layer of magnetic nanoparticles. The dispersant is phosphate buffer. It has good mono dispersity and magnetic response. Sedimentation will happen after long time unused. Before use, shake or ultrasonic dispersion is suggested.
b.Features
Superparamagnetic microspheres
Better monodispersity
0.1μm-5μm are available
3. Specifications
EPRUI Nanoparticles&Microspheres Co. Ltd. supply silica magnetic beads with various particle size and functional groups. Customization accepted if for special functional groups or particle size.