Table 1. . Iron oxide nanoparticle Z-average size from dynamic light scattering in deionized water and cell culture media and zeta potential represented as average ± standard deviation of three independent samples (n = 3).

Fe3O4 nanoparticle system	DI water		DMEM + 10% FBS		Zeta potential (mV)
	Size (nm)	PDI	Size (nm)	PDI
Uncoated	136.5 ± 1.8	0.2 ± 0.02	355.1 ± 23.2	0.3 ± 0.04	17.3 ± 4.1
Dx-ECH	177.3 ± 3.7	0.1 ± 0.03	203.4 ± 4.8	0.2 ± 0.01	-5.3 ± 3.9
Amine	173.7 ± 1.6	0.1 ± 0.02	405.7 ± 29.0	0.3 ± 0.03	-7.5 ± 6.2
TAT	126.9 ± 3.2	0.2 ± 0.02	201.5 ± 15.1	0.2 ± 0.02	14.8 ± 4.7

DI: Deionized; DMEM: Dulbecco's modified Eagle medium; FBS: Fetal bovine serum; PDI: Polydispersity Index.