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ProElut™ PSA sorbent contains two different amino groups, one primary and one secondary. It gives comparatively higher pK a and ionic capacity relative to ProElut™ NH2. The PSA sorbent is an excellent choice for extracting polar compounds from non-polar solvents. The compounds that are retained too strongly on a NH2 sorbent can be effectively eluted on a PSA sorbent. In addition, the PSA functional group is a very effective bidentate ligand in chelation applications.