The exact mechanisms for this antioxidant action is still debated since four different mechanisms have been proposed by Pegg and Shahidi (2000): 1) reaction of nitrite with heme pigments forming a stable complex, 2) action in tissue membranes by stabilizing its unsaturated lipids, 3) action of nitrite as a metal chelator and 4) the formation of nitroso compounds that can act as radical scavengers. Conversely, Ordonez, Hierro, Bruna, and Hoz (1999) stated that nitrite has higher antioxidant power than other antioxidants commonly used as preservatives by inhibiting the action of pro-oxidant compounds.