The effect of barrier materials on salmon quality and retort pouch properties stored under elevated conditions, 2007 PLACE Conference

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The effects of retort pouch barrier material on salmon quality and pouch properties were investigated. Four different retort pouch structures were used; AlO_x-coated PET/Nylon/CPP (ALOX), PET/ SiO>_x-coated Nylon/CPP (SIOX), PET/Al-foil/CPP (FOIL), cast polypropylene (CPP). Oxygen permeability of SIOX increased significantly after retorting. Conversely, oxygen permeability of the FOIL pouches did not change significantly and oxygen permeability of ALOX pouch increased slightly after retorting. Salmon in the SIOX pouches had higher thiobarbituric acid reactive substances (TBARS) values when compared to salmon in the FOIL pouches after a storage time of 7 weeks. An untrained sensory panel determined that salmon packaged in SIOX pouches had less acceptability than salmon in FOIL pouches after 8 weeks storage time. Salmon packaged in ALOX pouches had similar sensory and TBARS values when compared to salmon packaged in FOIL pouches. ALOX provided adequate barrier for maximum shelf life compared to traditional foil-barrier pouches.