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Schematic representation of the PSA immunosensor based on PSA detection antibody-modified Au nanoparticles using surface plasmon resonance (SPR). For the PSA sandwich analysis, following PSA/tPSA bindingto the SPR sensor layer, 1.5 μg∙mL−1 PSA detection antibody or Anti-PSA antibody conjugated AuNPs (20 nm, 5.1 × 1010 nanoparticles/mL or 40 nm, 5.1 × 1010 nanoparticles/mL) was injected on the surface. Adapted from [72].
