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Growth and Survival of Foodborne Pathogens in Beer
- Menz, Garry, Aldred, Peter, Vreiskoop, Frank
- Journal of food protection 2011 v.74 no.10 pp. 1670-1675
- Escherichia coli O157, Gram-negative bacteria, Listeria monocytogenes, Salmonella Typhimurium, Staphylococcus aureus, beers, ethanol, food pathogens, hops, pH, pathogen survival, storage temperature
- This work aimed to assess the growth and survival of four foodborne pathogens (Escherichia coli O157:H7, Salmonella Typhimurium, Listeria monocytogenes, and Staphylococcus aureus) in beer. The effects of ethanol, pH, and storage temperature were investigated for the gram-negative pathogens (E. coli O157:H7 and Salmonella Typhimurium), whereas the presence of hops ensured that the gram-positive pathogens (L. monocytogenes and S. aureus) were rapidly inactivated in alcohol-free beer. The pathogens E. coli O157:H7 and Salmonella Typhimurium could not grow in the mid-strength or full-strength beers, although they could survive for more than 30 days in the mid-strength beer when held at 4°C. These pathogens grew rapidly in the alcohol-free beer; however, growth was prevented when the pH of the alcohol-free beer was lowered from the “as received” value of 4.3 to 4.0. Pathogen survival in all beers was prolonged at lowered storage temperatures.