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K. C. SPENCER¹, D. J. Humphreys, and A. Robertson. (1) Safeway Stores plc, 6 Millington Road, Hayes, Middlesex, UB3 4AY, United Kingdom

Classical modified atmosphere packaging (MAP) systems use nitrogen, carbon dioxide and oxygen to preserve product characteristics. We have developed and successfully commercialized for the first time novel patented and licensed proprietary MAP systems using argon-based gas mixtures. We have developed, designed, tested and installed these systems at over 16 diverse food manufacturing sites. The first products were prepared and an initial product launch was made 14 September, 1998, and roll-out is continuing. Currently, over 150 different products having been packaged and/or processed in argon and placed in our 470 stores under a dedicated trademark. Products include nuts, potato chips, processed meats, beverages, fresh pasta, chilled prepared meals and prepared produce. We have collected and will present quantitative data from sensory studies, competing product quality challenges, microbial assays, and chemical testing which demonstrate the clear advantage that argon provides to product shelf life and quality. Sensory data was obtained from over 50 in house double-blind sensory panels, backed up by controlled sensory testing at point of manufacture. Microbial assays were performed in multiple replicates throughout shelf life, and results are compared with sensory data to determine relative quality and customer acceptance scores. Argon provides a significant extension of shelf life and an average of 25% improvement in quantifiable quality parameters such as flavor, appearance, aroma, color, texture, and overall customer acceptability.