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Antimicrobial Activity of Aqueous Ethanol Extracts of Perilla frutescens var. acuta Leaf

차조기의 에탄올과 물 혼합 추출물의 항균활성

  • Kim, Mi-Hyang (Department of Food Science & Nutrition, Sangju National University) ;
  • Lee, Nan-Hee (Department of Food Science & Nutrition, Catholic University of Daegu) ;
  • Lee, Myung-Hee (Department of health & Fermentation Food, Kyongbuk Collage and science) ;
  • Kwon, Dae-Jun (Department of Oriental Medicinal Resources, Asia University) ;
  • Choi, Ung-Kyu (Department of Oriental Medicinal Food and Nutrition, Asia University)
  • 김미향 (상주대학교 식품영양학과) ;
  • 이난희 (대구가톨릭대학교 식품영양학과) ;
  • 이명희 (경북과학대학 바이오식품과) ;
  • 권대준 (아시아대학교 한약자원학과) ;
  • 최웅규 (아시아대학교 한방식품영양학과)
  • Published : 2007.04.30

Abstract

This study was conducted to examine the antimicrobial activity of Perilla frutescens var. acuta leaf fractions extracted with a mixture of ethanol and water. The Ca and Mg contents of the leaf were 595.75 mg% and 467.0 mg%, respectively, and they were the highest among all of the test minerals. The extract yield increased w e content of water in e extraction solvent. Antimicrobial activity against Staphylococcus aureus, Bacillus subtilis and Pseudomonas aeruginosa was found in the 50,70 and 95% ethanol extracts. Of the various fractions extracted from the mixture of ethanol and water, the ethyl acetate fraction showed antibacterial activity against all microorganisms tested in this experiment, and the antibacterial activity of ethyl acetate fraction from the water extract was the strongest. The phenol and flavonoid content in the ethyl acetate fraction showed no correlation with the concentration of ethanol in the extract solvent; however, their contents were higher in the 30% ethanol and water extraction which the antimicrobial activity of the extract was the strongest.

차조기의 30, 50, 70, 95% 에탄올 추출물과 물추출물의 식품 관련 미생물에 대한 항균 활성과 이들 추출물의 분획물에 대한 항균 활성을 살펴보았다. 본 실험에 사용한 차조기의 무기질은 Ca와 Mg 함량이 각각 595.75 mg%와 467.0 mg%으로 가장 많았다. 에탄올 혼합 추출물과 물추출물의 추출 수율은 에탄올 농도가 낮을수록 증가하여 95%에탄올 추출물은 9.3%, 70% 추출물은 16.5%, 50% 추출물은 18.9%, 30% 추출물은 19.4%, 물추출물(0%)에서는 20.8%이었다. 추출용매의 에탄올 농도가 낮아질수록 hexane 층으로 용출되어 나오는 성분은 감소하고 ethyl acetate 층 분획성분은 점차 증가하는 것으로 나타났다. 에탄올 추출물과 물 추출물의 항균력은 95%, 70%와 50% 에탄올 추출물이 Staphylococcus aureus, Bacillus subtilis 및 Pseudomonas areuginosa에 대하여 clear zone을 나타내었다. 추출물을 단계별 계통 분획하여 얻은 분획물의 항균력 실험에서는 ethyl acetate층이 실험 대상 미생물 모두에 대하여 항균 활성을 나타내었으며 에탄올 혼합율이 낮을수록 즉, 30% 에탄올과 물추출물의 ethyl acetate분획물의 저해환이 가장 크게 나타났다. 물 추출물의 ethyl acetate 분획물을 첨가한 액체배양에서 500 ppm의 농도에서는 S. aureus, B. subtilis와 P. aeruginosa에 대하여 대조구의 뚜렷한 증가와 대조적으로 낮은 생균수를 보였으며, 1,000 ppm의 농도에서는 실험 균주 모두에 대하여 배양 24시간 내내 생육이 저해되는 것으로 나타났다. 물 추출과 에탄올 추출의 농도와 항균 활성, 폴리페놀 함량 및 플라보노이드 함량이 비례적인 상관관계에 있는 것으로 나타나지는 않으나 30% 에탄올 추출물과 물 추출물의 ethyl acetate분획물이 폴리페놀 함량이 높고 항균력이 가장 강한 것으로 나타났다.

Keywords

References

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