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Novel Ag-coated magnetic core–shell microspheres (Fe3O4@PEI@Ag) with polyethyleneimine (PEI) as an interlayer is used to measure adsorbed PATP (p-aminothiophenol) molecules and human IgG with a detection limit as low as 10−11 M and 10−14 g mL−1, respectively. Reprinted from Ref. [152]. Copyright 2015 Royal Society of Chemistry.
