Effects of protein oxidation on qualities and microstructure in refrigerated Coregonus peled muscle exposed to a hydroxyl radical-generating system

The object of this study was to investigate p H, electroconductivity, water-holding capacity, textures and microstructure of refrigerated Coregonus peled muscle treated by hydroxyl radical-generating systems ( HRGS) peroxide for 5 h.Hardness, adhesiveness, springiness, cohesiveness, gumminess, chewiness, resilience and shear force of refrigerated Coregonus peled muscle were tested by using Texture Profile Analysis ( TPA) model and the Warner-Brazler of texture analyzer, and the microstructure changes were observed by scanning electron microscope.The results showed that p H and water-holding capacity were in decline as refrigeration time increased, and the oxidized samples declined faster than those unoxidized samples, while the electroconductivity increased during refrigerating storage, what's more, the oxidized samples increased faster than those unoxidized samples ( p < 0.05) . Hardness, springiness, cohesiveness, gumminess, chewiness, resilience and shear force of Coregonus peled muscle both oxidized and unoxidized were dropped in different degree with the storage time increased, however, the adhesiveness highlighted a rising trend over the refrigeration time. In addition, the results observed scanning electron microscope showed that refrigerated Coregonus peled muscle became loose with the storage time increased, and the changes of those samples operated with hydroxyl radical were more significant than those unoxidized samples.These oxidationinduced textural and microstructural changes reveal high susceptibility of Coregonus peled muscle to hydroxyl radical stress.