• Journal of the Korean Wood Science and Technology
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• 제29권4호
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• pp.89-96
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• 2001

항균활성이 우수한 회화나무 목부로부터 4종의 isoflavonoid 화합물을 단리하였으며, 기기분석 결과 3종의 isoflavone인 5,7-dihydroxy-4',6-dimethoxyisoflavone(irisolidone)을 비롯하여, 5,7-dihydroxy-4'-methoxyisoflavone(Biochanin A), 7-hydroxy-4'-methoxyisoflavone(formononetin) 그리고 1종의 isoflavanone인 7-hydroxy-4'-methoxyisoflavanone으로 각각 동정하였다. 이들 단리 물질의 항균활성을 배지점적법으로 조사한 결과 4종의 isoflavonoid 공히 낮은 항균활성을 나타내어, 회화나무 목부의 높은 항균활성은 본 실험에서 단리한 물질 이외의 물질이 관여하는 것으로 추정되며 금후 관련물질의 탐색이 필요할 것으로 사료되었다.

• Mycobiology
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• 제46권1호
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• pp.52-63
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• 2018

In our previous studies, Bacillus megaterium KU143, Microbacterium testaceum KU313, and Pseudomonas protegens AS15 have been shown to be antagonistic to Aspergillus flavus in stored rice grains. In this study, the biocontrol activities of these strains were evaluated against Aspergillus candidus, Aspergillus fumigatus, Penicillium fellutanum, and Penicillium islandicum, which are predominant in stored rice grains. In vitro and in vivo antifungal activities of the bacterial strains were evaluated against the fungi on media and rice grains, respectively. The antifungal activities of the volatiles produced by the strains against fungal development and population were also tested using I-plates. In in vitro tests, the strains produced secondary metabolites capable of reducing conidial germination, germ-tube elongation, and mycelial growth of all the tested fungi. In in vivo tests, the strains significantly inhibited the fungal growth in rice grains. Additionally, in I-plate tests, strains KU143 and AS15 produced volatiles that significantly inhibited not only mycelial growth, sporulation, and conidial germination of the fungi on media but also fungal populations on rice grains. GC-MS analysis of the volatiles by strains KU143 and AS15 identified 12 and 17 compounds, respectively. Among these, the antifungal compound, 5-methyl-2-phenyl-1H-indole, was produced by strain KU143 and the antimicrobial compounds, 2-butyl 1-octanal, dimethyl disulfide, 2-isopropyl-5-methyl-1-heptanol, and 4-trifluoroacetoxyhexadecane, were produced by strain AS15. These results suggest that the tested strains producing extracellular metabolites and/or volatiles may have a broad spectrum of antifungal activities against the grain fungi. In particular, B. megaterium KU143 and P. protegens AS15 may be potential biocontrol agents against Aspergillus and Penicillium spp. during rice grain storage.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.350.3-351
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• 2002

2-Arylthio-, 2-arylthio-5-methoxy-, 2, 3-bisarylthio-juglones and 2, 3-bisarylthio-5, 8-dimethoxy-1, 4-naphthoquinones were newly systhesized for the evaluation of antifungal activities. These derivatives were prepared by methylation of juglone and 2, 3-dichloro-5, 8-dihydroxy-1, 4-naphthoquinone. and by resioselective nucleophilic subsitution with arylthiols. All compounds were tested in vitro for their growth inhibitory activities against pathogenic fungi by the standard method. The MIC values were determined by comparison to flucytosine as a fungicidal standard agent. In general. In general. most juglone derivatives shows in vitro antifungal activities. Among them. 2-arylthio-5-methoxy-juglones showed most potent antifungal activities against all pathogenic fungi.

• Mycobiology
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• 제33권4호
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• pp.210-214
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• 2005

More than 120 isolates of lactic acid bacteria obtained from Kimchi was screened for antifungal activity against Aspergillus fumigatus. Approximately 10% of the isolates showed inhibitory activity and only 4.16% (five isolates) exhibited strong activity against the indicator fungus A. fumigatus. The five isolates showed a wide rang of antifungal activity against A. flavus, Fusarium moniliforme, Penicillium commune, and Rhizopus oryzae. They were identified by 16S rDNA sequencing as Lactobacillus cruvatus, L. lactis subsp. lactis, L. casei, L. pentosus, and L. sakei. The effect of Lactobacillus on mycelial growth and fungal biomass as well as its ability to produce toxic compounds were determined. The results indicate that the three species, Lactobacillus casei, L. lactis subsp. lactis, and L. pentosus, are active against A. fumigatus.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2002년도 생물공학의 동향 (X)
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• pp.215-218
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• 2002

식물병원균에 대한 Helicosporium 의 항균작용을 확인하기 위하여 식물병원균인 Rhizoctonia solani, Rhizoctonia solani AG2-2, Fusarium oxysporium, Phytophthora dreschler, Alternaria 속을 선정하였고, 이에 대한 항균작용을 검토한 결과, Rhizoctonia solani, Rhizoctonia solani AG2-2 에는 강한 항균활성을 나타내었으며, Alternaria에는 미약한 항균활성을 가졌으며 Fusarium oxysporium, Phytophthora dreschler에 대해서는 항균활성을 하지 않는 것으로 확인되었다. 이 항균물질의 구조를 $^1H-NMR$ 스펙트럼을 통해서 분석한 결과 이 물질은 콜레스테롤 에 해당하는 구조를 가진 것으로 추정된다.

• The Plant Pathology Journal
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• 제17권1호
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• pp.52-56
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• 2001

This study was undertaken to separate and identify antifungla substances produced by Gilocladium virens G1, a biocontrol agent used for the control of plant diseases caused by Rhizoctonea solani. The culture of G. virens G1 effectively inhibited the growth of R. solani, Colletotrichum gloeosporioides, and Phytophthora capsici, but less that of Fusarium oxysporum. The n-hexane extract of the G. virens culture, which was used for the purification of responsible substances, strongly inhibited R. solani and C. gloeosporioides, but not P. capsici, although the n-butanol extract was effective on all of the pathogens tested. An antifungal substance was purified using the n-hexane extract by Silica gel column chromatography and HPLC. The substance was examined for purity by HPLC and for nature by UV spectrometry, which differed from known antibiotic compounds such as gliotoxin, viridin and gliovirin. The antifungal substance was very liphophilic based on its solvent-solubility and Rf values on TLC, and more inhibitory to C. gloeosporioides than other fungal pathogens tested.

• Journal of Microbiology and Biotechnology
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• 제25권3호
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• pp.353-357
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• 2015

A new actinomycete strain NA4 was isolated from a deep-sea sediment collected from the South China Sea and showed promising antifungal activities against soilborne fungal pathogens. It was identified as Streptomyces cavourensis by morphological, physiological, and phylogenetic analyses based on its 16S rRNA gene sequence. The main antifungal components were isolated and identified from the fermentation culture as bafilomycins B1 and C1. These compounds exhibited significant antifungal activities and a broad antifungal spectrum. The results suggest that the Streptomyces cavourensis NA4 and bafilomycins B1 and C1 could be used as potential biocontrol agents for soilborne fungal diseases of plants.

• 보존과학회지
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• 제24권
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• pp.75-83
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• 2008

고문서 보관을 위해 사용되고 있는 오동나무상자의 항균활성을 측정하기 위해 오동나무로부터 방출된 휘발성 물질에 대한 항균활성과 휘발성 유기물질의 주성분을 정성분석 하였다. 항균활성은 상자 내부에 TSA 배지를 장착한 미생물 포집기를 설치하고 포집 후 배지에 성장한 미생물의 집락수를 관찰하였다. 그 결과 실외에서 포집한 배지의 집락수 85개 대비 14.82%가 감소한 72개 집락수가 관찰되었다. 포집된 공기질을 열탈착시스템 및 가스크로마토그래피/질량분석법을 통해 분석한 결과, 오동나무 상자 내 VOCs에서 limonene이 특징적으로 검출되었다. Eugenol과 anethole을 주성분으로 하는 천연 살생물제 I과 II를 상자 내에 첨가하여 훈증에 의한 항균활성을 측정한 결과, 약제 모두 실외와 오동나무 상자 내부에서 포집된 미생물 개체수 대비 각각 92.6%, 99.9% 이상 감소율을 보였다. 위의 결과로부터 사용된 오동나무 상자로부터 방출된 휘발성 유기화합물에 의한 항균활성 및 그 유효성분은 분석되지 않았으며, 생물피해로부터 고서적을 장기보관하기 위한 유물 보관함의 효율을 증진시키기 위해 천연 살생물제의 적용 가능성을 확인할 수 있었다.

• 농약과학회지
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• 제10권4호
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• pp.237-248
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• 2006

항균활성을 나타내는 thyme oil의 주성분인 thymol(I)과 carvacrol(II)을 출발물질로 하여 ester, sulfonyl ester, carbamate, ether와 phosphoyl ester 계열 유도체 41종을 합성하였다. IR, GC/MS 와 $^1H$-NMR spectrum을 이용하여 합성된 화합물들을 확인하였다. 이들 유도체들을 10종의 식물 병원균에 대하여 항균활성 실험을 실시한 결과 몇가지 화합물이 우수한 항균활성을 나타내었다. 이들 화합물에 대한 in vivo실험은 오이, 토마토와 벼 작물에서 실시하였다. 그 결과, 2-isopropyl-5-methylphenyl acetate(I-1a)가 오이 잿빛곰팡이 병균(Botrytis cinerea)과 벼도열병균(Pyrcularia oryzae)에 높은 항균활성을 나타내었으며, methyl(2-isopropyl-5-methylphenoxy)acetate(I-6d)는 벼 잎집무늬마름병균(Rhizoctonia solani)에서 ethyl4-(2-methyl5-isopropylphenoxy)-crotonate(I-7d)는 토마토역병균(Phytophthora infestans)에서 우수한 항균활성을 나타내었다.

• 대한화학회지
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• 제53권6호
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• pp.731-741
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• 2009

$NaHSO_4.SiO_2$ 촉매를 이용한 microwave 및 무수조건하에서 새로운 morpholino pyrimidines의 One-pot합성이다. 합성된 모든 화합물을 이용하여 in vitro에서 임상학적인 단리된 박테리아 품종 즉 Bacillus subtilis, Bacillus cerues, Micrococcus luteus , Salmonella typhii에 대해 항균성을 살펴보았고, 균품종 즉 Aspergillus niger, Candida 6, Candida 51에 대해 항진균성을 살펴보았다. 미생물 결과에 대한 합성된 화합물의 구조적 활동성의 관련성에 대해 토론하였다.