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Microbial Growth

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Brittney Guzman Anthony Spencer Tifuh, Nkweti Emmanuel Duodu, Amanda Boiter Microbial Growth on Lunchmeat Increases Over Time at Room Temperature Abstract Lunchmeat is a perfect medium for the rapid growth of microbes because it is high in moisture. How long can zip locked lunchmeat be left out before it becomes unsafe for consumption? In order to test the safety of lunchmeat being left out of refrigeration, an experiment was conducted over a three-day period. All turkey samples were in a zip locked bag, the 24 and 72 hour samples were left out at room temperature; the control remained refrigerated. All samples were inoculated into agar deeps, then into petri dishes to create a series of dilutions. We observed growth on all three Petri Dishes with the control having the least and 72-hour containing the most. This shows that although the turkey meat was sealed, microbial growth increases over time while left out at room temperature. This is important to maintain and know the safety of ingestion of lunchmeat after 24-72 hours. Introduction “Refrigerated storage is now one of the most widely practiced methods of controlling microbial growth in perishable foods. As a result of this practice, refrigerated storage of perishable foods has been shown to be a potential risk factor for the development of microbial hazards leading to foodborne illness”(Simon). Food poisoning is very common and in order to avoid this illness certain precautions need to be maintained to prevent this. Refrigeration is vital to retain preservation; it keeps food fresh and decreases spoilage. Turkey lunchmeat is a perfect medium for microbes to grow, if not packaged and stored correctly. When left in a zip locked bag is accumulates condensation that increases the moisture in the bag. “Food spoilage and spoilage can occur when there are slight changes in relative humidity. Moisture can condense on

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