SH

Magnetic silica particles (sicastar®-M) with a diameter of 1.5 µm are available with SH groups on the surface for the covalent binding of proteins, antibodies or other molecules .
The particles are stable in aqueous and in organic media and allow the binding of water-soluble molecules as well as of molecules, that are only soluble in organic solvents. The functionalized particles are supplied in water.
Recently sicastar®-M particles with thiol groups on the surface were used for preconcentration of mercury(II) and lead(II) for stripping voltammetric determination of the metal ions (Mandil et al., 2010).