TABLE 1.

ZN2+ CONCENTRATIONS IN SUPERNATANTS FROM ZINC OXIDE NANOPARTICLE SUSPENSIONS

	Zn2+(μg/ml)
Supernatant Source	MDSF	MDS
11 μg/ml ZnO NP suspension	4.5 ± 0.2	7.9 ± 0.2
22 μg/ml ZnO NP suspension	5.3 ± 0.2	9.2 ± 0.1
176 μg/ml ZnO NP suspension	6.8 ± 0.2	10.8 ± 0.3

Definition of abbreviations: MDS = minimal defined serum-free medium supplemented with 10% newborn bovine serum; MDSF = minimal defined serum-free medium; NP = nanoparticle; ZnO = zinc oxide.

Zn²⁺ concentrations were measured from ZnO NP–free supernatants obtained by centrifugation after incubating ZnO NP in fresh MDSF or MDS for 24 hours (n = 3).