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Absolute Mag™ PEI Magnetic Particles, 0.5 μm (# WHM-X073) are water soluble iron oxide particles with organic layers consist of a monolayer of oleic acid, a monolayer of amphiphilic polymer and a monolayer of polyethylenimine (PEI). There is no linkable reactive groups on the surface of nanoparticles. PEI is very stable in most buffer solutions of pH 5-10 and can capture negatively charged molecules, such as DNA and RNA, through charge-charge interaction. https://www.cd-bioparticles.com/p/PEI-Magnetic-Particles_20_196_248_440.html