http://www.cd-bioparticles.com/p/Absolute-Mag-Amine-Iron-Oxide-Nanoparticles-30-nm_20_193_209_4950.htmlAbsolute Mag Amine Iron Oxide Nanoparticles, which are coated with amphiphilic polymer and dextran, are water soluble iron oxide nanocrystals. The functional group on surface is amine. Their zeta potential is from 0 mV to +10 mV. Their organic layers contain a monolayer of oleic acid, a monolayer of amphiphilic polymer, and a monolayer of dextran, whose thickness is about 6 nm. The hydrodynamic size of the nanocrystals is about 12-14 nm larger than their inorganic core size measured by the TEM. Absolute Mag Amine Iron Oxide Nanoparticles can be conjugated to carboxylic acid or amine containing molecules with low non-specific binding.