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Physiological Characteristics and Tyrosinase Inhibitory Activity of Lactobacillus plantarum M23 Isolated from Raw Milk

원유에서 분리한 Lactobacillus plantarum M23의 Tyrosinase 활성 저해 및 생리적 특성조사

  • Published : 2007.12.30

Abstract

In order to develop a new starter for fermented milk, Lactobacillus plantarum M23 was isolated from raw milk and investigated for physiological characteristics. It showed good tyrosinase inhibitory activity compared with commercial lactic acid bacteria. The optimum growth temperature of Lactobacillus plantarum M23 was $40^{\circ}C$ and cultures took 17 hr to reach pH 4.3. Lactobacillus plantarum M23 showed more sensitivity to Penicillin-G, Oxacillin, Novobiocin, Chloramphenicol in a comparison of 12 different antibiotics, and showed most resistance to Vancomycin. It showed higher leucine arylamidase and ${\beta}-galactosidase$ activities compared to 16 other enzymes. It was comparatively tolerant to bile juice and able to survive at pH 2 for 3 hours. It showed high resistance to Escherichia coli, Salmonella typhimurium and Staphylococcus aureus with rates of 77.8%, 86.5% and 83.8%, respectively. Based on these and previous results, Lactobacillus plantarum M23 could be an excellent starter culture for fermented milk with high resistance to melanin.

본 연구는 국내 각 지역의 목장에서 수거한 원유에서 분리된 젖산균 M23 균주에 대해 tyrosinase 활성 저해율을 측정한 결과, mushroom에서 추출한 tyrosinase에서는 52.1%, Melanoma B16에서 추출한 tyrosinase에서는 32.0%로 나타났으며, 활성 저해율이 다른 상업균주와 시중 발효유에 비해 높게 나타남에 따라 tyrosinase 활성 저해효과가 우수한 균주로 선발하였다. 선정된 균은 Gram 양성, rod형태의 homo균이며, 당 발효실험과 16S rRNA 분석결과 Lactobacillus plantarum으로 판명되었고, L. plantarum M23으로 명명하였다. 발효유에 적합한 starter인지 확인하기 위해 생리적 특성을 조사하였다. L. plantarum M23은 배양온도 $40^{\circ}C$에서 빠른 생장을 보였고, pH 4.3에 도달하는데 17시간이 소요되었다. 16종의 항생제 중 vancomycin에 대해 내성이 높았으며, 효소활성실험에서 leucine arylamidase, ${\beta}-galactosidase$의 활성도가 높았다. 담즙 첨가시 약간의 영향을 받았으나 담즙에 대한 내성이 있는 것으로 나타났으며, pH 내성 실험결과 pH 2에서 큰 변화가 없음에 따라 내산성이 있었다. 항균력 시험에서는 E. coli에 대해 77.8%, S. typhimurium와 S. aureus에 대해 각각 86.5%, 83.8%의 억제력이 나타나 항균력이 높은 것으로 나타났다. 이러한 결과를 토대로 멜라닌 억제능이 우수한 기능성 발효유 제품의 스타터로 L. plantarum M23은 적합하다고 할 수 있다.

Keywords

References

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