Hydrodynamic diameter and zeta potential of ZnO NPs in combined systems^b.

	Particle size (nm)		Zeta potential (mV)
	In water	In mediuma	In water	In mediuma
ZnO	157 ± 27	172 ± 13	−15.3 ± 0.9	−6.1 ± 0.2
ZnO + CPP	289 ± 16	357 ± 36	−13.3 ± 0.6	−7.5 ± 0.6
ZnO + VC	162 ± 29	194 ± 78	−11.3 ± 0.2	−6.7 ± 0.3
ZnO + CPP + VC	203 ± 68	276 ± 42	−14.0 ± 0.4	−9.7 ± 0.5

^aCulture medium is high-glucose DMEM with 10% fetal bovine serum.

^bData are presented as the mean ± S.D.