Table 2.

Summary of polydispersity index (PDI), and zeta potential parameters of Fe₃O₄, Fe₃O₄@SiO₂, Fe₃O₄@SiO₂-16PHDA, Fe₃O₄@SiO₂-16 PHDA-α-transglucosidase.

Samples	PDI	ζ-P (Mv)
Fe3O4	0.212 ± 0.01	− 37.0 ± 1.52
Fe3O4@SiO2	0.22 ± 0.010	− 43.0 ± 0.57
Fe3O4@SiO2-16 PHDA	0.208 ± 0.04	− 46.0 ± 1.0
Fe3O4@SiO2-16PHDA-α-transglucosidase	0.161 ± 0.01	− 31.0 ± 1.15