Amino magnetic beads are magnetic particles modified with amino functional groups on the surface and have superparamagnetic properties. They are a widely used functional biological magnetic beads and are mainly used for the preparation of immunomagnetic beads. Magnetic microspheres are monodisperse and non-agglomerated regular round spheres, with stable particle size, superparamagnetism, fast magnetic responsiveness, rich amino functional groups, monodispersity and sub-micron particle size, etc. They are used in crosslinking reagents (such as EDC, glutaraldehyde) can be conveniently and efficiently covalently coupled with a variety of biological ligands (protein ligands, peptides, oligonucleotide probes, drug molecules, etc.), which can be used as a good basic material Subsequent processing such as coating, adsorption, and chemical modification is an important carrier tool in medical and molecular biology research. It is safe and simple to operate, which is very conducive to automation and high-throughput covalent coupling operations. Mainly used in the field of biological analysis and detection, such as in vitro diagnosis, microbial detection, immunoprecipitation, immunoprecipitation, etc.