Figure 5.
(A) Dependence of the gRET efficiency for energy transfer from FITC to AuNP@Cit on PD-L1 concentration showing saturation at higher PD-L1 concentrations. (B) Details of the limit of detection (LOD) determination using 3σ method (LOD = 1.2 nM). FITC concentration: 66.7 nM, CAuNP@Cit = 2.02 nM, λex = 495 nm.