Superparamagnetic Bifunctional Bisphosphonates Nanoparticles: A Potential MRI Contrast Agent for Osteoporosis Therapy and Diagnostic

Figure 4

IR spectra of HA (red curve) and HA incubated with $\gamma {\text{Fe}}_2{\text{O}}_3$@di-HMBP (blue curve) for 24 hours and separated from free nanoparticules. Insert: optical image taken from HA (a) and HA incubated with $\gamma {\text{Fe}}_2{\text{O}}_3$@di-HMBP (b).