Triple-modal imaging of stem-cells labeled with multimodal nanoparticles, applied in a stroke model

Figure 3 Characterization of the hydrodynamic diameter, zeta potential and optical properties of multimodal nanoparticles-IR750. A: Curves of the hydrodynamic size distribution of MNP-IR750 over 18 h; B: Spectrum of the surface charge of MNP-IR750 with a zeta potential at pH 7.4 of ξ = +29.2±1.9 mV; C: MNP-IR750 excitation/emission spectrum (blue and red curves, respectively), showing fluorescence intensity peaks of 757.9 and 779.4 nm, respectively. MNP: Multimodal nanoparticles.