Figure 3: UV-VIS absorption spectra of GNR-Ab (HER2) conjugates with different modifications of GNR surface after incubation at 3 hours in 10% solution of FBS. Control sample is pegylated GNR (PEG). The other three samples are GNR modified with MHDA and PEG (molar ratios are 1, 2 and 4 MHDA for 8 PEG: 1M:8P, 2M:8P and 4M:8P, respectively), activated with cross linkers EDC and sulfo NHS (CL), then conjugated with Ab HER2.