For the most common commercial minced meat system the
time series was analysed. The total peroxides (Fig. 4A and B) were
highest in the system with added KCS, at least at the end of the
experiment. The total peroxides increased with time for all systems.
Typically, PFP increased quickly in MAP when KCS were
added. The major part of PFP was endogenous, however, and presumed
dominantly due to the combination of haem and fatty acids
(Yi et al., 2013). All types of peroxides (unpolar, polar and
protein-bound peroxides) nominally increased with storage time
although the increase in protein-bound peroxides in high oxygen
was not significant (P > 0.05, not shown). Unpolar peroxides were
always significantly higher, if KCS were added on the final day of
chill-storage. However, the increase in PFP was small (max 12%
increase in MAP