In order for the radical scavenging antioxidants to act efficient in the application of antioxidant active packaging, a further investigation of the radical formation during the HP treatment was undertaken. The tendency to form radicals during heat incubation was examined in meat samples immediately after pressure treatment and samples that had not been pressurised. The same tendency to radical formation was found in all 4 types of samples (Table 1), and suggests that high pressure treatment does not immediately affect the oxidative stability of the meat. The mincing of the meat and the procedure by which the concentration of radicals is measured involves a certain cell disruption upon homogenisation, assuming that the level of release and active enzymes and phospholipids is similar for all samples. It is shown (Fig. 3) that some time is needed in order for the radical formation in the meat patties to proceed, indicating a certain kinetic restrain on the initiation of lipid oxidation by high pressure.