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. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: Toxicol In Vitro. 2009 Aug 20;23(7):1365–1371. doi: 10.1016/j.tiv.2009.08.005

Table 1.

Cellular antioxidant enzyme activities following exposure to nanoparticles (80 µg/cm2). The activity of superoxide dismutase (SOD), catalase, glutathione reductase, and glutathione peroxidase were measured and normalized to protein concentration. Data are expressed as mean ± SE of 2 replicates, (n =3). One-way ANOVA

Enzyme activity vehicle SiO2 Fe2O3 CuO
total SOD
(% inhibition rate)		 66.28 ± 2.765 77.13 ± 3.609 78.30 ± 3.293 74.61 ± 2.949
catalase
(unit/mg protein)		 5.494 ± 0.0733 5.107 ± 0.1148 4.359 ± 0.2050* 4.105 ± 0.2176*
glutathione reductase
(unit/mg protein)		 0.0145 ± 0.0002 0.0163 ± 0.0005* 0.0140 ± 0.0003 0.0107 ± 0.0001*
glutathione peroxidase
(unit/mg protein)		 0.1684 ± 0.0070 0.1867 ± 0.0165 0.2039 ± 0.0163 0.3958 ± 0.0093*
*

p< 0.05 vs. vehicle.