Thiobarbituric acid (TBA) values
Storage time and gas composition were the significant factors for
thiobarbituric acid (TBA) values. Thiobarbituric acid reactive substances
(TBARS) values showed differences (Pb0.05) with storage
time and between storage conditions (Fig. 3). Ostrich meats packaged
with air or with high CO2 concentrations had lower mean TBARS
values during the 10 days of storage compared to meat in O2 packages.
High O2 concentration led to higher lipid oxidation and modified
atmosphere packaging did not extend the shelf-life of ostrich meats
compared to air packaged ones. TBARS values of all air packaged
ostrich samples remained lower than those of modified atmosphere
packaged samples. This was observed during the entire storage time
except in 60:40:0/O2:CO2:N2 atmosphere and 3:1 headspace
packages, which showed at day 10 a difference to 8.78 mg MDA/kg
(Fig. 3). Samples in 1:1 headspace ratios had higher (Pb0.01) TBARS
values than those with a 3:1 headspace. These results agree with
Ordonez and Ledward (1977) who stated that the concentration of
oxygen in the atmosphere is the determining factor for the rate of
lipid oxidation.
Seydim et al. (2006) emphasised that after 6 days of storage,
ground meat packaged in O2 and air had increased (P≤0.05) TBA
values, whereas no significant changes were observed for meat in N2
and vacuum packs. They observed