Oxidative stability of previously frozen ostrich <i>Muscularis iliofibularis</i> packaged under different modified atmospheric conditions

Abstract

Summary This study investigated the aptness of modified atmospheric packaging (70:30, O 2 :CO 2 (O_MAP); 70:30, N 2 :CO 2 (N_MAP)) and traditional overwrap (control) for previously frozen ostrich steaks, stored at 4 ± 1 °C for 10 days. The N_MAP showed the least oxidation, O_MAP the highest and the control moderate. The redness (CIE a *) decreased to 3.67 ± 0.83 by day 10 in the O_MAP, the N_MAP and control initially had lower values indicating slower oxidisation. The free carbonyl production was higher in the O_MAP than the N_MAP and control. TBARS remained relatively constant for the N_MAP and control, but increased to 9.70 ± 3.26 (day 10) in the O_MAP. Drip loss (non‐cumulative), was initially high (5–6%) for N_MAP and control, followed by a decrease on day 2 (2%) that increased to day 10 (4–6%). In conclusion, the traditional overwrap was not suited; N_MAP holds potential under a true anoxic atmosphere whilst O_MAP was limited by protein and lipid oxidation.