Fig. 2
Evaluation of the feasibility of the biosensing strategy. A Schematic diagram of the detection process. B Typical SPR sensorgrams of the biosensor (red line) and blank control without loading (black line). C SPR sensorgrams of the different conditions: (a) the intact sensing system, (b) the sensing system without hemin, and (c) blank control. D SPR sensorgrams of the different materials: (a) AuNPs-Ty, (b) Ty, (c) AuNPs, and (d) blank control. The concentration of HER2-positive exosomes derived from SK-BR3 cells is 1 × 107 particles/mL. All data expressed as mean ± standard variation (n = 3)