• 제목/요약/키워드: minimal inhibitory concentration (MIC)

검색결과 236건 처리시간 0.028초

Antibacterial Activity of Essential Oils from Zanthoxylum piperitum A.P. DC. and Zanthoxylum schinifolium

  • Choi, Soo-Im;Chang, Kyung-Mi;Lee, Yong-Soo;Kim, Gun-Hee
    • Food Science and Biotechnology
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    • 제17권1호
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    • pp.195-198
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    • 2008
  • This study was carried out to investigate the potential use of Zanthoxylum schinifolium and Zanthoxylum piperitum A.P. DC. as a source of antimicrobial agents against food borne pathogens. Essential oils of Z. schinifolium and Z. piperitum A.P. DC. were collected by steam distillation and analyzed by GC-MS. The antimicrobial activity of the essential oils was examined using the agar diffusion and micro-dilution assays. The effectiveness of Z. schinifolium essential oil was greater against Bacillus cereus, Staphylococcus aureus, and Vibrio parahaemolyticus than other pathogens, and the minimal inhibitory concentration (MIC) values were 1.25, 2.5, and 1.25, 2.5, and $1.25\;{\mu}g/mL$, respectively. Z. piperitum A.P. DC. essential oil was the most effective against all pathogens tested except for Escherichia coli O157:H7, and the MIC values against B. cereus, Salmonella choleraesuis, and V. parahaemolyticus were 1.25, 2.5, and $1.25\;{\mu}g/mL$, respectively. Limonene, the major component of Z. piperitum A.P. DC. essential oils, had the highest inhibitory activity toward V. parahaemolyticus with a MIC value of $0.15\;{\mu}g/mL$. Meanwhile, citronellal and geranyl acetate, major components of both essential oils, displayed antibacterial activity against only B. cereus with MIC values of 1.25 and $5\;{\mu}g/mL$, respectively. Therefore, these essential oils could be useful as antimicrobial agents against foodborne pathogens.

Cefixime의 치주병원성 세균 6종에 대한 항균 효과 (Antimicrobial effect of cefixime on 6 species of periodotopathogens)

  • 장현선;박문규;국중기;김화숙;김병옥
    • Journal of Periodontal and Implant Science
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    • 제35권2호
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    • pp.401-411
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    • 2005
  • The aim of this study was to determine the minimal inhibitory concentration(MIC) of cefixime, which is a 3rd generation of cefalosporin, against 6 species of putative periodontopathogens; Fusobacterium nucleatum, Actinobacillus actinomycetemcomitans, Prevotella intermedia, Prevotella nigrescens, Tannerella forsythia and Porphyromonas gingivalis. The efficacy of cefixime was examined by comparing it with that of several antibiotics(amoxicillin, $Augmentin^{(R)}$ ciprofloxacin, metronidazole, and tetracycline), which were used as the control. The MIC was measured using a microdilution method. The MIC of cefixime against the putative periodotopathogens, as a single use regimen, was relatively lower than that of the other antibiotics. The MIC of cefixime/metronidazole against P. intermedia ChDC KB14, P. nigrescens ChDC KB50, F. nucleatum ChDC PV-F37, F. nucleatum ChDC F130, and F. nucleatum ChDC F175, as a simultaneous regimen, was lower than that of the other antibiotics. The concentration of cefixime in the crevicular fluid of volunteers who received 250mg every 12 hours for 3 days was $9{\mu}g/ml$ after 9 hours. In conclusion, cefixime showed good antimicrobial activity in a single treatment or as a combined therapy with amoxicillin, $Augmentin^{(R)}$ or metronidazole against 6 periodontopathogens.

Helicobactericidal Activity of Cissus quadrangularis L. Variant I

  • Austin, Anoop;M, Jegadeesan;R., Gowrishankar
    • Natural Product Sciences
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    • 제10권5호
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    • pp.217-219
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    • 2004
  • Cissus quadrangularis L. variant I (Family: Vitaceae), the common variant with square stem is widely used for peptic ulcer disorders (PUD) in traditional medicine. Aerial parts were collected during flowering and vegetative seasons and analysed. Aqueous (hot and cold) and solvent extracts (acetone, chloroform and ethanol) were screened for their anti-Helicobacter pylori (Hp) activities. Among them chloroform extract was observed to recover bioactive principles markedly with low minimal inhibitory concentration (MIC) and minimal lethal concentration (MLC). MIC was $30\;{\mu}g$ in both samples and MLC was $35\;{\mu}g$ for vegetative and $30\;{\mu}g$ for flowering seasons, respectively. Extracts from samples collected during flowering season were better than thse of vegetative season.

Elfvingia applanata 엑스의 항균력 및 Naringenin과의 병용효과 (Antimicrobial Activity of Elfvingia applanata Extract Alone and in Combination with Naringenin)

  • 천준희;이순옥;임교환;어성국;이종길;한성순
    • 한국균학회지
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    • 제23권2호통권73호
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    • pp.153-160
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    • 1995
  • 담자균류의 하나인 잔나비걸상 자실체로부터 얻은 수성엑스의 항세균 시험과 항진균 시험을 액체배지 희석법으로 실시하고 naringenin과의 병용시험을 checkerboard assay 법으로 평가하였다. 항세균 시험결과 전반적으로 그람음성균보다 그람양성균에 대해 비교적 양호한 항균력을 나타내었으나 사용된 균주중 그람음성균인 Proteus vulgaris 78615는 MIC가 1.125 mg/ml로 가장 양호한 항균효과를 나타내었다. 11종의 균주에 대해 실시된 항진균 시험결과 Candida albicans, Fusarium spp. 그리고 Trichophyton mentagraphytes의 MIC가 7.5 mg/ml로 다른 균주에 대한 항진균 효과보다 두배 더 강한 효과를 나타내었다. naringenin과의 병용시험에서 Staphylococcus aureus ATCC 25923에 대하여 부분적 상승효과를 나타내었고, Klebsiella pneumoniae ATCC 10031과 Salmonella typhi ATCC 6229 두 균주에서 상가효과가 관찰되었다. 그리고 Bacillus subtilis ATCC 6633을 비롯한 7종의 균주에서 무관효과를 나타내었으며 길항효과는 관찰되지 않았다.

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대나무 기름의 항균효과 (Antimicrobial Activity of Bamboo(Phyllostachys bambusoides) Essential Oil)

  • 이숙경
    • 한국식품위생안전성학회지
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    • 제15권1호
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    • pp.55-59
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    • 2000
  • Bamboo oil의 천연 보존료로서의 가치를 평가하기 위해 합성 보존료인 BHA와 이미 수입되어 사용되고 있는 천연보존료인 tea tree oil을 비교하기 위하여 disc diffusion법과 broth dilution 법으로 S. aureus와 E. coli대한 항균력을 검토한 결과를 요약하면 다음과 같다. 1. Disc diffusion법으로 S. aureus에 대한 항균력을 조사한 결과 BHA>tea tree oil>bamboo oil 순이었고 E. coli에 대한 항균력은 bamboo oil이 가장 강하게 나타났으며 다음은 BHA>tea tree oil순으로 나타났다. 2. Broth dilution법으로 S. aureus와 E. coli모든 시료 6.0$\mu$l/ ml 이상에서 모두 측정되지 않아 모든 시료에서 동일하게 최소억제농도가 6.0$\mu$l/ ml 이상 필요한 것으로 나타났다. 3. Bamboo oil의 이용 개발 시 경제적 조건은 동일한 항균력을 기대할 때 tea tree oil에 비하여 약 20%정도 저렴하여 경제성이 충분히 있는 것으로 나타났다.

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버섯 중 항균물질의 검색 및 개발에 관한 연구 -그람양성균에 대한 항균물질의 검색 (1보)- (Study on the Screening and Development of Antibiotics in the Mushrooms -The Screening of Bacterial Antibiotics in Basidiomycetes (I)-)

  • 박상신;이갑득;민태진
    • 한국균학회지
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    • 제23권1호통권72호
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    • pp.28-36
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    • 1995
  • 53종의 한국산 야생버섯 중 12종의 버섯으로부터 석유에테르, 80% 에탄올 및 증류수로 추출하여 얻은 14개의 추출물이 6종의 그람양성균에 대하여 각각 선택적으로 항균활성을 나타내었다. 3 종류의 추출용매 중 에탄올 추출물에 대부분의 항균활성이 존재하였으며, 특히 Thylopilus PS-5, Pulveroboletus PS-7 및 Russula PS-9의 추출물들은 다른 종의 버섯에 비교하여 항균활성의 선택성이 다양하였다. Pulveroboletus PS-7과 Boletus PS-8의 에탄올 추출물은 B. subtilis에 대하여 $300\;{\mu}g/ml$, Trichaptium PS-3의 에탄올 추출물은 M. luteus에 대하여 $500\;{\mu}g/ml$를 나타내었으며, 이외의 추출물은 모두 $1000\;{\mu}g/ml$ 이상의 비교적 큰 값의 MIC를 나타냄으로써 향후 좀 더 정제단계를 거쳐 이상의 버섯 중의 항균활성 물질의 구명을 위한 연구를 시도할 필요가 요구된다.

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Postantibiotic Effects and Postantibiotic Sub-MIC Effects of Antibiotics on Treponema Denticola

  • Lee, Si-Young
    • International Journal of Oral Biology
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    • 제34권3호
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    • pp.165-168
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    • 2009
  • Postantibiotic effect (PAE) is defined as the length of time that bacterial growth is suppressed following brief exposure to an antibiotic. In this study, the in vitro PAE, postantibiotic sub-MIC effect (PA SME) and sub-MIC effect (SME) of antibiotics on Treponema denticola ATCC 35405 were investigated. The PAE of doxycycline and metronidazole were 20.3 h and 25.0 h, respectively. The PA SMEs examined by addition of 0.1, 0.2 and 0.3X MICs during the postantibiotic phase of the bacteria for metronidazole were longer than those for doxycycline. In contrast, the SMEs for doxycycline were longer than those for metronidazole. The PA-SME and SME values increased as the concentration of antibiotics increased. The present study illustrates the existence of PAE, PA-SME and SME for several antibiotics against T. denticola, thereby extending the pharmacodynamic advantages of these antibiotics.

백강균(Beauveria bassiana)을 이용한 식물병원성세균 생장억제효능 검증 (Effects of the growth inhibition against plant pathogenic bacteria using Beauveria bassiana)

  • 이기만;남성희;홍인표;성규병;배윤환;강태진
    • 한국버섯학회지
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    • 제9권2호
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    • pp.87-89
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    • 2011
  • 뽕나무병원성세균에 대한 Beaveria bassiana 6균주의 항균활성을 paper disc법으로 조사하였고 최소성장저해농도(MIC)를 액체배지희석법으로 조사하였다. 항균활성은 B. bassiana J200에서만 나타났으며, Erwinia rhapontici KACC 10407에서는 13mm, Pseudomonas syringae KACC 10390와 Xanthomonas campestris KACC 12134에서는 각각 17 mm의 항균활성이 나타났다. MIC 측정 결과 E. rhapontici KACC 10407, P. syringae KACC 10390 및 X. campestris KACC 12134 모두 4.0%에서 MIC를 보였다. 이상의 결과로 B. bassiana의 뽕나무병원성세균에 대한 생물학적 방재제로서의 이용 가능성을 확인하였다.