| AgNPs | silver nanoparticles |
| CV | coefficient of variation |
| DAP | 2,3-diaminophenazine |
| DAPH+ | protonated 2,3-diaminophenazine |
| DAPH22+ | doubly protonated 2,3-diaminophenazine |
| ELISA | enzyme-linked immunosorbent assay |
| HRP | horseradish peroxidase |
| LOD | limit of detection |
| NTA | nanoparticle tracking analysis |
| oPD | o-phenylenediamine |
| oPDH+ | protonated o-phenylenediamine |
| oPDH22+ | doubly protonated o-phenylenediamine |
| SERS | surface-enhanced Raman scattering |
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