Korean journal of food and cookery science (한국식품조리과학회지)

Korean Society of Food and Cookery Science (한국식품조리과학회)
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Effect of green tea on the survival of Escherichia coli O157:H7 and Salmonella typhimurium in mayonnaise

마요네즈에 첨가한 녹차가 Escherichia coli O157:H7과 Salmonella typhimurium의 생존에 미치는 영향

  • 박찬성 (경산대학교 식품영양학과) ;
  • 박금순 (대구가톨릭대학교 가정관리학과)
  • Published : 2002.02.01
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Abstract

The purpose of this study was to investigate the antibacterial activity of green tea in mayonnaise against pathogenic bacteria (Escherichia coli O157:H7 and Salmonella typhimurium). Mayonnaise was prepared with salad oil, egg yolk, sugar, salt and vinegar, and green tea powder was added to the mayonnaise at 0.1, 0.3 and 0.5% for the experiment. Then, the mayonnaise samples with various levels of green tea were inoculated with about 10$\^$6/ cells/g of E. coli and S. typhimurium per 1 gram of mayonnaise and stored at 5$^{\circ}C$, 15$^{\circ}C$ and 25$^{\circ}C$ for 3∼9 days. Antibacterial activity of green tea was tested by the colony counting method for E. coli on violet red bile agar(VRBA) and S. typhimurium on xylose lysine desoxycholate agar(XLDA). The D-values of E. coli controls were 2.89, 2.73 and 2.13 days while those of S. typhimurium controls were 0.58, 0.53 and 0.52 days at 5$^{\circ}C$, 15$^{\circ}C$ and 25$^{\circ}C$, respectively Inhibitory effect of green tea in mayonnaise on the survival of E. coli and S. typhimurium was increased with increasing concentration of green tea and/or increasing storage temperature. The most effective antibacterial activity of green tea was shown against E. coli in mayonnaise during storage at 25$^{\circ}C$.

대두유, 난황, 설탕, 소금, 식초로서 마요네즈를 제조한 직후에 녹차분말을 0~0.5% 첨가하여 녹차분말이 마요네즈내에서 식중독세균에 미치는 항균 작용을 조사하였다. Ercherichia coli O157:H7과 Salmonella typhimurium 배양액을 희석하여 각 농도의 마요네즈 1g당 약 $10^{6}$ CFU되게 접종한 후 5$^{\circ}C$, 15$^{\circ}C$, $25^{\circ}C$에 3~9일 동안 저장하면서 생균수를 측정하였다. 녹차 첨가에 의한 항균활성은 평판배양법으로 E. coli는 violet red bile agar(VRBA), S. typhimurium 은 xylose lysine desoxycholate agar(XLDA) 배지를 사용하여 각 세균의 생균수 변화를 조사하였다. E. coli 대조구의 D-value는 5, 15와 $25^{\circ}C$에서 각각 2.89, 2.73, 2.13일이었으며 S. typhimurium 대조구는 5, 15, $25^{\circ}C$에서 각각 0.58, 0.53 및 0.52일 이었다.마요네즈내에서 녹차의 식중독세균에 대한 항균활성은 첨가한 녹차의 농도가 높을수록, 마요네즈의 저장온도가 높을수록 증가하였다. 녹차 첨가시의 가장 큰 항균효과는 $25^{\circ}C$에 저장한 E. coli에서 대조구에 비하여 가장 높은 비율(34-61%)의 항균활성을 나타내었다.

Keywords

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