http://www.cd-bioparticles.com/p/Amine-Magnetic-Particles_20_193_209_230.htmlAbsolute Mag Amine Magnetic Particles, PEG Spacer Arm, Smooth Surface (# WHM-S060) have a thick layer on the surface of the particles, containing a PEG-based spacer arm that is terminated with amine groups for coupling carboxyl-containing molecules, so there is no exposed iron oxide on the surface of the particles. They are used for cell separation, affinity purification, DNA probe assays, magnetic bead EIA, etc, particularly useful in applications where exposed iron oxide may interfere with the enzymatic activities or cause other undesirable interferences.Cell Isolation, Antibody/Protein Purification, DNA Probe Assays, Immunoassay