Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Effect of green tea supplementation on probiotic potential, physico-chemical, and functional properties of yogurt

요구르트의 프로바이오틱 활성과 물리화학적 및 기능적 특성에 대한 녹차 추출물의 영향

  • Lim, Eun-Seo (Department of Food Science & Nutrition, Tongmyong University)
  • 임은서 (동명대학교 식품영양학과)
  • Received : 2017.06.02
  • Accepted : 2017.06.26
  • Published : 2017.06.30
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Abstract

The aim of this study was to evaluate the effect of green tea extract on probiotic potential, physico-chemical and functional properties of yogurt fermented with Lactobacillus acidophilus D11 or Lactobacillus fermentum D37 strains isolated from Doenjang. Probiotic activities such as the resistance to artificial digestive juices and the ability to adhere to epithelial cells were slightly higher in yogurt supplemented with green tea extract than in plain yogurt, which may be attributed to the increase in the number of lactic acid bacteria (LAB) by green tea extract supplementation. Furthermore, the microbiological and physico-chemical properties such as the number of LAB, organic acid production and viscosity were significantly (P<0.05) increased in yogurt added green tea extract compared to plain yogurt fermented with L. acidophilus D11. However, the green tea extract did not significantly (P>0.05) affect these properties of yogurt fermented with L. fermentum D37 strain. Meanwhile, the antibacterial activities against Escherichia coli O157 ATCC 43889, Salmonella enteritidis ATCC 13076, and Salmonella typhimurium KCTC 2514 and antioxidant activities including total phenol content, radical scavenging ability, and ferric-reducing antioxidant power were significantly higher in plain yogurt fermented with L. fermentum D37 than with L. acidophilus D11. The antibacterial and antioxidant activities of the yogurt were significantly (P<0.05) increased in proportion to the concentration of green tea extract added to plain yogurt. Consequently, green tea yogurt fermented with L. acidophilus D11 or L. fermentum D37 was considered to be a useful functional food that can inhibit the growth of pathogenic bacteria and scavenge the free radicals from the body cells.

본 연구에서는 된장으로부터 분리된 Lactobacillus acidophilus D11 또는 Lactobacillus fermentum D37 균주로 발효시킨 요구르트의 프로바이오틱로서의 가능성, 물리 화학적 및 기능적 특성에 대한 녹차 추출물의 영향을 조사하였다. 인공 소화액에 대한 저항성과 상피 세포에 대한 부착력과 같은 프로바이오틱활성은 플레인 요구르트보다 녹차 추출물을 첨가한 요구르트에서 다소 높게 나타났는데, 이는 유산균의 수의 증가에 기인하는 것으로 추정되었다. L. acidophilus D11로 발효시킨 플레인 요구르트에 녹차 추출물을 첨가한 경우 유산균수, 유기산 함량 및 점도와 같은 요구르트의 물리 화학적 특성도 유의하게 (P<0.05) 증가하였다. 하지만 녹차 추출물은 L. fermentum D37 균주 발효시킨 요구르트의 물리 화학적 특성에는 유의한 영향을 미치지 않았다 (P>0.05). 한편, Escherichia coli O157 ATCC 43889, Salmonella enteritidis ATCC 13076 및 Salmonella typhimurium KCTC 2514에 대한 항균 활성 및 총 페놀 함량, 라디칼 소거능 및 철 환원력과 같은 항산화 활성은 L. acidophilus D11 보다는 L. fermentum D37로 발효시킨 플레인 요구르트에서 현저히 높았다. 게다가 요구르트의 항균 및 항산화 활성은 녹차 추출물의 농도에 비례하여 유의적으로 증가하였다(P<0.05). 결론적으로, L. acidophilus D11 또는 L. fermentum D37로 발효시킨 녹차 요구르트는 병원성 세균의 성장을 억제하고 체세포 내에 생성된 자유 라디칼을 제거 할 수 있는 유용한 기능성 식품으로 이용할 수 있는 것으로 판단되었다.

Keywords

References

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