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Acute Toxicity of Lactobacillus plantarum AF1 Isolated from Kimchi in Mice

김치로부터 분리한 Lactobacillus plantarum AF1의 마우스에 대한 급성독성

  • 이환 (조선대학교 식품영양학과) ;
  • 이재준 (조선대학교 식품영양학과) ;
  • 장해춘 (조선대학교 식품영양학과) ;
  • 이명렬 (조선대학교 식품영양학과)
  • Received : 2012.03.02
  • Accepted : 2012.04.13
  • Published : 2012.04.30

Abstract

The $in$ $vivo$ single-dose acute toxicity of $Lactobacillus$ $plantarum$ AF1, a lactic acid bacterium isolated from kimchi, in ICR male and female mice was investigated. The test article was intraperitoneally or orally administered once to both sexes of mice. The motalites, clinical findings, autopsy findings, and body weight changes were monitored daily for 14 days. In the oral acute toxicity test, the male and female mice were gavaged with four doses (5.0, 2.5, 1.25 and 0.625 g/kg) of $Lb.$ $plantarum$ AF1. The oral $LD_{50}$ of the $Lb.$ $plantarum$ AF1 was considered higher than 5.0 g/kg. In the intraperitoneal acute toxicity test, mice were injected intraperitoneally with dosages of 0.7, 0.9, 1.1, 1.3, 1.5, 1.7, 1.9, 2.1, 2.3 and 2.5 g/kg. The intraperitoneal 50% lethal dose ($LD_{50}$) of the $Lb.$ $plantarum$ AF1 was >2.5 g/kg in the male and female mice. No significant changes in the general conditions, body weights, clinical signs, and gross lesions were observed in both sexes of mice to which $Lb.$ $plantarum$ AF1 was administered intraperitoneally or orally. The results suggest that the no-adverse-effect level of $Lb.$ $plantarum$ AF1 is estimated to be more than 5.0 g/kg in the oral route and 2.5 g/kg in the intraperitoneal route.

본 연구는 김치에서 분리한 항진균 및 항세균 활성을 나타내는 $Lb.$ $plantarum$ AF1을 분리하여 이 균의 천연 식품보존제 및 사료보존제로서 사용 적합성 및 안전성을 평가하고자 단회 급성독성시험을 실시하였다. 급성독성시험을 위하여 경구 혹은 복강으로 1회 시험물질을 최고 용량(경구: 5,000 mg/kg, 복강: 2,500 mg/kg)으로 하여 ICR계통 암 수 마우스에게 용량별 각 군당 10마리씩 투여한 후 14일간의 일반증상, 사망률, 체중, 임상증상 및 육안적 소견을 관찰하였다. 단회 경구투여 혹은 복강주사한 후 모든 시험군에서 사망례가 관찰되지 않았으며, 시험동물은 시험 종료 시까지 계속 생존하여 평균치사량을 산출할 수 없었다. 복강 혹은 경구투여한 후 마우스의 체중변화에 있어서도 암 수 모두 대조군과 시료물질 투여군 사이에 유의성 있는 차이는 보이지 않았으며, 용량 의존적인 차이도 볼 수 없었다. 경구구투여 혹은 복강주사 단회 투여한 후 시험 종료한 다음 생존동물 모두를 부검하여 주요 장기의 육안적 소견을 관찰한 결과 대조군과 시료투여군 모두에서 외관상이나 내부장기에 어떠한 이상소견이나 병변이 관찰되지 않았다. 이상의 결과로부터 시험물질인 $Lb.$ $plantarum$ AF1는 경구투여 혹은 복강주사 시 ICR계통 암 수 마우스에서 독성학적인 변화가 관찰되지 않았으며, $LD_{50}$은 복강주사가 2,500 mg/kg, 경구투여가 5,000 mg/kg 이상인 저독성의 안전한 물질로 사료된다.

Keywords

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