Table 7. Characterization of the HDL-mimicking α-tocopherol-coated NGF NPs using protamine sulfate USP and Poly-D-Lysine as ion-pair agents, respectively (n=3).

NGF HDL-mimicking NPs	Particle size (nm)	P.I.	EE% of NGF	Zeta potential (mV)
Protamine sulfate USP	171.4 ± 6.6	0.239 ± 0.01	65.9 ± 1.4	−12.5 ± 1.9
Poly-D-lysine	160.1 ± 11.7	0.282 ± 0.005	49.1 ± 1.7	−24.9 ± 8.1