3.2. Comparison of packaging with rosemary and oxygen scavenger
HPP treatment of minced pork patties at 700 MPa and 5 C for 10 min changed the texture, giving a gel-like and softer texture, and
the colour, became paler and less red. The concentration of oxygen and carbon dioxide in the head-space of the OS packages was monitored during storage (Table 1). The concentration of oxygen increased slightly during the initial 10 days following a decrease till day 25. This oxygen, not absorbed from the headspace, may have been trapped inside the meat patty, acting as an oxygen reservoir, as well as some amount might have migrated from the outside through the film. At the end of storage (day 60), oxygen was markedly reduced (below 0.1%). In contrast, carbon dioxide concentration increased as a result of the oxygen depletions and likely the growth of microorganisms (Table 1).
Both fat content and lipid profile play important roles in the susceptibility of a product to be oxidized and need accordingly to be taken into account. The meat patty had a fat content of 17% with a typical fatty acid type distribution for pork with 51% of monounsaturated fatty acids (Table 2).