Magnetic beads (or superparamagnetic particles) are one of the most versatile tools in molecular biology for easy and effective isolation of biomolecules.

Magnetic beads incorporate tiny (20 to 30 nm) particles of iron oxides, such as magnetite (Fe3O4), which give them superparamagnetic properties. Unlike more common ferromagnets, superparamagnetic beads exhibit magnetic behavior only in the presence of an external magnetic field.

▶️ https://www.cytivalifesciences.com/en/us/solutions/genomics/knowledge-center/magnetic-bead-guide/magnetic-bead-basics

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