Food Science of Animal Resources (한국축산식품학회지)

Korean Society for Food Science of Animal Resources (한국축산식품학회)
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Mathematical Model for Predicting the Growth Probability of Staphylococcus aureus in Combinations of NaCl and NaNO2 under Aerobic or Evacuated Storage Conditions

  • Lee, Jeeyeon (Department of Food and Nutrition, Sookmyung Women's University) ;
  • Gwak, Eunji (Department of Food and Nutrition, Sookmyung Women's University) ;
  • Ha, Jimyeong (Department of Food and Nutrition, Sookmyung Women's University) ;
  • Kim, Sejeong (Department of Food and Nutrition, Sookmyung Women's University) ;
  • Lee, Soomin (Department of Food and Nutrition, Sookmyung Women's University) ;
  • Lee, Heeyoung (Department of Food and Nutrition, Sookmyung Women's University) ;
  • Oh, Mi-Hwa (National Institute of Animal Science, RDA) ;
  • Park, Beom-Young (National Institute of Animal Science, RDA) ;
  • Oh, Nam Su (R&D Center, Seoul Dairy Cooperative) ;
  • Choi, Kyoung-Hee (Department of Oral Microbiology, College of Dentistry, Wonkwang University) ;
  • Yoon, Yohan (Department of Food and Nutrition, Sookmyung Women's University)
  • Received : 2016.08.09
  • Accepted : 2016.11.05
  • Published : 2016.12.31
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Abstract

The objective of this study was to describe the growth patterns of Staphylococcus aureus in combinations of NaCl and $NaNO_2$, using a probabilistic model. A mixture of S. aureus strains (NCCP10826, ATCC13565, ATCC14458, ATCC23235, and ATCC27664) was inoculated into nutrient broth plus NaCl (0, 0.25, 0.5, 0.75, 1, 1.25, 1.5, and 1.75%) and $NaNO_2$ (0, 15, 30, 45, 60, 75, 90, 105, and 120 ppm). The samples were then incubated at 4, 7, 10, 12 and $15^{\circ}C$ for up to 60 d under aerobic or vacuum conditions. Growth responses [growth (1) or no growth (0)] were then determined every 24 h by turbidity, and analyzed to select significant parameters (p<0.05) by a stepwise selection method, resulting in a probabilistic model. The developed models were then validated with observed growth responses. S. aureus growth was observed only under aerobic storage at $10-15^{\circ}C$. At $10-15^{\circ}C$, NaCl and $NaNO_2$ did not inhibit S. aureus growth at less than 1.25% NaCl. Concentration dependency was observed for NaCl at more than 1.25%, but not for $NaNO_2$. The concordance percentage between observed and predicted growth data was approximately 93.86%. This result indicates that S. aureus growth can be inhibited in vacuum packaging and even aerobic storage below $10^{\circ}C$. Furthermore, $NaNO_2$ does not effectively inhibit S. aureus growth.

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References

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