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Dispersive solid-phase extraction (dSPE) using fatty acid-coated Eu 2 O 3 nanoparticles (NPs) was developed, and a direct immunoassay was carried out employing these NPs as support. Secondary antibodies labeled with fluorophore groups were used as reporters, and the intrinsic optical properties of the Eu 2 O 3 NPs were employed as an internal calibration of the detection...
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