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SampliQ Amino (NH
2
) SPE products are based on irregular, silica gel (silica)
particles. This dual purpose sorbent can act either as a polar phase or weak
anion exchanger. When conditioned with a non-polar solvent, e.g., hexane,
it can hydrogen bond with any molecule containing -OH, -NH, or -SH functional
groups. In an aqueous environment with pH 7.8 or less, it can function as a weak
anion exchanger.
Figure: Structure of aminopropyl (NH
2
) silane,
covalently bonded to the surface
of a silica particle
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