Table 1.

Physical properties of nanoparticles.

Nanoparticles	Particle Size (nm)	Polydispersity Index (PDI)	Zeta Potential (mV)	Amino Group Content (mM)
Gelatin	95.99 ± 0.267	0.133 ± 0.006	−50.6	0.077 ± 0.004
Gelatin-RITC (GR NPs)	111.8 ± 1.000	0.175 ± 0.012	−53.2	0.0263 ± 0.006
Gelatin-RITC-PEI (2:1) (GR-PEI NPs)	109.3 ± 0.458	0.142 ± 0.023	+53.9	0.290 ± 0.009