Radicals are important intermediates in the formation of lipid oxidation products, and are also involved in the transformation of primary oxidation products to secondary lipid oxidation prod-
ucts. It has previously been shown that rosemary prevents lipid oxidation in HP-treated chicken meat by lowering the radical formation, as measured by ESR spectroscopy (Bragagnolo et al.,
2007). In order to explore the oxidation mechanism at the surface of meat patties and the protection by the antioxidant active packaging, the radical formation was monitored.