nhs magnetic beads Absolute Mag™ NHS Magnetic beads, 50 nm (# WHM-X019) are uniform, superparamagnetic particles with a high density of NHS (N-hydroxylsuccinimide) functional groups on the surface. The particles are used to specifically conjugate primary amine-containing targeted protein or ligands in a simple mix-and-go format for use in custom affinity purification experiments with significant low non-specific binding. http://www.cd-bioparticles.com/l/NHS-activated-Magnetic-Particles_20 _193_218.html