Table 3. Average Hydrodynamic Diameters (D_H) for the Number-Weighted Size Distribution of Differently Functionalized Core–Shell SPION and Polydispersity Indices (PDI) for the Fitted Distributions.

	DH [nm]	mean PDI [a.u.]	PDI standard deviation [%]
PEG(5 kDa)	15.8	0.27	4.0
8.7 nm-PEG	26.9	0.19	0.6
8.7 nm-PEG after MRI	27.0	0.23	0.2
8.7 nm-NDA-PEG-4B	27.0	0.18	0.2
8.7 nm-NDA-PEG-4B-Avidin	27.3	0.29	0.8
8.7 nm-NDA-PEG-90B	27.9	0.23	1.0
8.7 nm-NDA-PEG-90B-Avidin	27.2	0.33	0.5
Resovist	30.8	0.19	1.0