Heat resistance and growth of Salmonella enteritidis, Listeria monocytogenes and Aeromonas hydrophila in whole liquid egg.
Salmonella enteritidis ATCC,13067, Listeria monocytogenes ATCC,19116 and Aeromonas hydrophila ATCC,7965 strains were evaluated for growth and thermal resistance in liquid whole egg (LWE). Each strain grew well in LWE at temperatures between 4 and 30 degrees C, except S. enteritidis which grew weakly at 4 and 10 degrees C. Maximum populations for each strain increased with increasing growth temperature. The thermal destruction of each strain was determined in six liquid products. The egg products used were LWE, LWE with 5, 10 and 15% NaCl and LWE with 5 and 10% sucrose. L. monocytogenes tended to be more heat resistant than S. enteritidis and A. hydrophila. The highest kill rates were noted in LWE, while survival was best in those products supplemented with NaCl. Radiation D10 values of strains in LWE were 0.18, 0.39 and 0.49 kGy for A. hydrophila, S. enteritidis and L. monocytogenes, respectively.
Abdel Karem
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National Center for Radiation Research and Technology, Department of Microbiology, Nasr City-Cairo, Egypt. Dr.Hussein@mailexcite.com
Mattar
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D016980:Aeromonas hydrophila / Q000254:growth & development*; D004531:Eggs / Q000382:microbiology*; D005516:Food Microbiology; D005524:Food Technology; D005720:Gamma Rays; D006358:Hot Temperature; D008089:Listeria monocytogenes / Q000254:growth & development*; D012477:Salmonella enteritidis / Q000254:growth & development*