Oxidative status, in vitro iron-induced lipid oxidation and superoxide dismutase,catalase and glutathione peroxidase activities in rhea meat

Rhea (Rhea americana) muscles Obturatorius medialis (OM) Iliotibialis lateralis (IL) and Iliofibularis (I), obtained from farmed animals, were evaluated regarding their oxidative/antioxidant status. The mean level of thiobarbituric acid reactive substances (TBARS) expressed as malonaldehyde (MDA) content was of 0.84 mg MDA/kg wet tissue for the three muscles. TBARS level was significantly higher in IL than OM and I, with the two latter showing similar levels. The mean level of carbonyl proteins expressed as dinitrophenylhydrazine (DNPH) was 1.59 nmol DNPH mg⁻¹. Carbonyl protein levels were significantly different (P < 0.05) between the three muscles (IL > OM > I). Iron-induced TBARS generation was not significantly different between the three muscles at any time, nor for each muscle during the 5 h of the experiment. Superoxide dismutase activity in IL muscle was significantly higher (P < 0.05) than in I muscle. However, the difference between IL and OM muscles was not significant. The differences between the three muscles became not significant when the results were expressed by mg of protein contained in the extract, instead by g of wet tissue. No differences were found for catalase (μmol of discomposed H₂O₂ min⁻¹ g⁻¹ wet tissue or by mg of protein contained in the extract) and glutathione peroxidase (μmol of oxidized NADPH min⁻¹ g⁻¹ of wet tissue or by mg of protein contained in the extract) activities between the three muscles.