In order to contribute to the understanding of pressure-induced lipid oxidation and to optimise the antioxidant active packaging,the mechanism by which the HP induces the lipid oxidation was
further studied. It has been suggested that the pressure induces the release of iron from myoglobin, thereby facilitating metal initiated lipid oxidation (Cheah & Ledward, 1995). On the other hand,Orlien et al. (2000) showed that the effect of high pressure on lipid oxidation in chicken meat breast did not originate from a release of free iron or from a conformational change of metmyoglobin during the HP treatment. Another assumption is that lipid oxidation may
be initiated by membrane damage of the muscle cells, which can release prooxidative compounds and enzymes together with easily oxidised compounds such as unsaturated polar lipids.