Absolute Mag™ Chitosan Magnetic Particles, Polysaccharide, 50 nm (# WHM-C132) are ferrofluids consisting of an aqueous dispersion of magnetic iron oxides with diameters of 50 nm. The matrix of the beads contains polysaccharide and with ß-(1-4)-linked D-glucosamine and N-acetyl-D-glucosamine, which can be used for cell seperation and protein immobilization.