• 한국식품조리과학회지
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• 제27권1호
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• pp.1-9
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• 2011

Anti oralmicrobial effects of Nulembo nucifera were determined against S.mutans, S.sobrinus S.sobrinus, F.nucleatum, and A.actinomycetemcomitans using paper disc method, minimum inhibitory concentrate (MICs). Extracts of lotus leaf showed the highest yield. MeOH extract is 21%, Chloroform fraction is 4.2%, ethylacetate fraction is 8.2%, water fraction is 19%. Different parts such as flower, leaf, seed and pod showed antimicrobial effects against S.mutans, with flower and seed extracts showing strong antimicrobial effect aganinst S.sobrinus KCCM11897. Leaf extract(1000pm concentration) showed over 50% inhibitory effect against S.mutans and S.sobrinus KCCM11897. Flower extract showed over 40% inhibitory effect against F.nucleatum and A.actinomycetemcomitans. MICs of flower extract against S.sobrinus KCCM11897,11898 and leaf extract against S.mutans, S.sobrinus KCCM11897 were $625\;{\mu}g/ml$, indicating Nulembo nucifera extract can exert antimicrobial activity even at low concentration. All extractes with heat at $120^{\circ}C$ had antimicrobial activity, which means that is a very stable substances. F.nucleatum and A.actinomycetemcomitans was stable against acid it had a trend that the more akali side was the lower acitivity.

• 한국식품조리과학회지
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• 제33권1호
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• pp.65-71
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• 2017

Purpose: This study was carried out to investigate the availability of raw Astragalus membranaceus as a food ingredient. Methods: Raw and dried A. membranaceus water extracts were used to examine the free radical scavenging activity, polyphenol and flavonoid contents, and antimicrobial activity. Also, the sensory characteristics of each water extracts were evaluated. Results: The free radical scavenging activity and total polyphenol and flavonoid contents of raw A. membranaceus extracts were higher than those of dried A. membranaceus extracts. The antimicrobial activities of raw and dried A. membranaceus extracts were examined against several food borne illness-causing microorganisms using the paper disc diffusion method. Inhibition zones were observed in Staphylococcus aureus subsp. aureus, Bacillus subtilis, Pseudomonas aeruglnosa, Salmonella enterica subsp. enterica, Escherichia coli and Bacillus cereus treated with raw extracts. Inhibition zones were observed in B. subtilis, P. aeruglnosa and S. enterica subsp. enterica treated with dried extracts. Raw A. membranaceus extracts had higher scores than dried extracts in sensory evaluation. Conclusion: Raw A. membranaceus was better in antioxidative, antimicrobial activities, and sensory characteristics than dried one.

• Journal of Microbiology and Biotechnology
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• 제26권6호
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• pp.1011-1017
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• 2016

The antimicrobial effects of methanol and ethanol extracts of Inula britannica against several Helicobacter pylori strains (26695, J99, and SS1) were evaluated in vitro, to determine their applicability as functional foods. In the paper disc diffusion method, the antimicrobial effects of the I. britannica extracts against the H. pylori strains were apparent. Viable cell counting also showed that the extracts at 100 μg/ml concentration dramatically decreased the viability of the H. pylori strains. In particular, the methanol and ethanol extracts at a concentration of 100 μg/ml reduced the H. pylori SS1 cell number to 2.46 log CFU/ml and 1.08 log CFU/ml, respectively. In the presence of 100 μg/ml extracts, the urease production of H. pylori SS1 was decreased to more than 30%, whereas that of H. pylori J99 and H. pylori 26695 was decreased to about 20%, relative to the controls. The extracts inhibited the attachment of the H. pylori strains to human gastric AGS cells as well as caused the detachment of already attached H. pylori cells. In addition, the H. pylori morphology was changed to a coccoidal shape in the presence of the extracts. In conclusion, the I. britannica extracts were effective against H. pylori strains in vitro, irrespective of genotype status, and could therefore be used as novel functional foods.

• Journal of Microbiology and Biotechnology
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• 제27권3호
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• pp.429-438
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• 2017

For centuries, plants have been used for a wide variety of purposes, from treating infectious diseases to food preservation and perfume production. Presently, the increasing resistance of microorganisms to currently used antimicrobials in combination with the appearance of emerging diseases requires the urgent development of new, more effective drugs. Plants, due to the large biological and structural diversity of their components, constitute a unique and renewable source for the discovery of new antibacterial, antifungal, and antiparasitic compounds. In the present paper, the history, composition, and antimicrobial activities of the basil, oregano, and thyme essential oils are reviewed.

• Applied Biological Chemistry
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• 제41권3호
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• pp.258-263
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• 1998

본 연구는 polyyne계 항생물질의 분자 구조와 활성관계를 체계적으로 살펴본 최초의 보고로서 친수성기와 tetrayne 부분을 갖고 있는 화합물이 강한 항균활성을 가질 것이라는 결과를 얻었다. 이와 같은 선행 연구결과를 바탕으로 보다 개선된 활성을 갖는 화합물을 합성하기 위하여 tetrayneol 부분 구조를 가지는 novel한 polyhydroxy 화합물인 당류 유도체를 합성하고 항균성과 구조와의 관계를 검토하였다.

• Food Science and Biotechnology
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• 제14권2호
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• pp.268-274
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• 2005

Novel antimicrobial substance was isolated from seed coat of Canavalia gladiata by extraction with 75% methanol. Isolation and purification were conducted with solvent fractionation and chromatography on silica gel and sephadex LH-20 columns. Each fraction of antimicrobial activity was tested by paper disc method. Single compound was obtained from the 4th fraction of sephadex LH-20 column chromatography using chloroform/methanol (1:4, v/v), and identified as 3,4,5-trihydroxybenzoic acid methyl ester (methyl gallate) based on HPLC, GC/MS, FT-IR, $^1H$ NMR, and $^{13}C$ NMR analyses. This is the first report describing the presence of methyl gallate in C. gladiata.

• 한국입자에어로졸학회지
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• 제5권3호
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• pp.111-122
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• 2009

This paper reviews about synthesis of nanoparticles by spark discharge and applications. A method of catalytic activation with Pd and Pt aerosol nanoparticles produced by spark discharge was introduced. After annealing, the catalytically activated substrate placed into a solution for electroless silver deposition. The silver was then formed only on the activated regions of the substrate. Silver line patterns having a width of $18{\mu}m$ and a height of $1{\mu}m$ were created with the ability to be effectively reproduced. Antimicrobial nanoparticles such as silver were used for removal of bioaerosols. Silver nanoparticles deposited air filters such as ACF filters were evaluated by antimicrobial test.

• 통합자연과학논문집
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• 제4권1호
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• pp.15-22
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• 2011

In this study, liquid with carbonized artemisia was developed for the first time that can be used as food additives and outside medicinal agents by burning artemisia species such as Artemisia dubia wall, Artemisia capillaris Thunb, Artemisia montana (Nakai) Pamp), Artemisia keiskeana Miq, Leonurus Japonicus Houtt. etc. In addition, edibility of recovered liquid with carbonized artemisia was verified by comparing the contents according to each ingredient with common refined pyroligneous liquid through the analysis of 9 kinds of organic acid by the species of artemisia, methanol and ethanol. Besides, the result of antimicrobial activities on six kinds of food spoilage and food poisoning bacteria observed by paper disc method for liquid with carbonized artemisia indicated that those two liquids showed strong antimicrobial. At the concentration of 1.5 mg/disc, clear zone for S. sonnei and S. aureus, L. monocytogenes was 13~16 mm, and they showed stronger antimicrobial activities than other strain.

• 한국식품과학회지
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• 제38권6호
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• pp.816-822
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• 2006

신선한 왕대(Phyllostachys bambuoides sieb. et zucc.)를 이용하여 기계식 죽초액과 재래식 죽초액을 제조하고 이들의 농도에 따른 항균활성을 조사하였으며 정체 기계식 죽초액이 대두유 저장 과정 중 산패억제 효과를 조사하였다. 각각의 죽초액은 10-50 ${\mu}L/8$ mm paper disc 농도범위에서 공시 모든 공시균주에 대하여 활성을 나타내었으며 재래식 죽초액의 편이 기계식 죽초액에 비하여 항균활성이 더 크게 나타났다. 동일한 조건하에서 죽초액의 항균활성은 그람양성균 > 그람음성균 > 젖산균 > 효모의 순이었다. 그리고 모든 공시균주에 대하여 3.0%의 acetic acid 50 ${\mu}L/8$ mm paper disc에 상당한 죽초액의 항균활성 농도는 10-50 ${\mu}L/8$ mm paper disc 범위이며, 각각의 균주에 대한 활성농도는 서로 차이를 나타내었다. MIC는 대체로 1.0-7.3 ${\mu}L/mL$ 범위였으며 최대치사농도(MLC)는 26.7-116.7 ${\mu}L/mL$ 범위였다. 대두유 저장기간 동안 죽초액 첨가 농도 0.1-1.0% 범위에서 농도가 증가할수록 산패억제 효과도 컸으며, 죽초액 0.1% 첨가하였을 때 효과가 BHT 0.02% 첨가하였을 때와 유사하였으며 ${\alpha}-tocopherol$ 0.02% 첨가한 것보다 높은 산화억제 효과를 보였다. 죽초액 0.1, 0.5 및 1.0% 첨가 대두유의 유도기간은 각각 3.75, 4.57 및 12.06일 이었으며, 무첨가구의 2.86일에 비하여 모두 길었고, 상대적 항산화 효과는 각각 130.85, 159.60 및 421.30%로 죽초액 0.5%를 첨가할 때가 BHT 0.02% 첨가하였을 때의 168.45%와 비슷하게 나타났다. 죽초액은 일부 식중독균 및 식품부패균에 대한 억제효과와 유지 산패억제 효과가 인정되므로 이를 이용한 식품첨가제의 개발이 기대된다.

• 한국식품조리과학회지
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• 제21권1호
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• pp.53-63
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• 2005

4종류의 식품 위해 세균 Salmonella typhimurium, Listeria monocytogenes, Staphylococcus aureus, Esherichia coli과 김치 부패에 관여하는 곰팡이 Aspergillus sp. Penicillium sp.에 대하여 김치 재료에 의한 항균성을 조사하였다. Paper disc method로 측정한 생육저해환 결과 4 종류의 세균에 대하여 각 재료의 methanol 추출물들은 E. coli에 대해서 재료에 따라 약간의 차이는 있으나 약 20.00 mm에 가까운 항균성을 보이는 경향을 알 수 있었으며 생강과 양파는 다른 재료와 비교해볼 때 형성된 clear zone의 크기가 작은 경향을 확인할 수 있었다. 곰팡이에 대한 결과 Aspergillus sp.과 Penicillium sp.에 대하여 마늘 추출물이 가장 우수하였고, 생강 추출물과 무 추출물도 우수한 항균 작용을 나타내었다. S. typhimurium에 대하여 농도별 생육저해는 무, 양파 추출물이 균의 중식이 활발히 일어나는 대수중식기인 4$\~$12시간 사이에 생육을 억제하는 것으로 나타났고 고춧가루 추출물도 1,000 ppm의 농도에서 S. typhimurium의 생육을 크게 억제하는 것으로 나타났으며 L. monocytogenes의 생육에 미치는 영향은 S. typhimurium에 대한 결과 유사하였으며 paper disc로 조사한 생육 저해환의 결과와 일치하는 경향을 보였다. 반면 전체적으로 김치 재료 methanol 추출물은 S. aureus 생육 저해에 큰 영향을 미치지 못했으나 특별히 1,000 ppm 농도의 마늘 추출물이 S. aureus 생육에 있어서 유도기를 8시간까지 상당히 연장시켰다. Esherichia coli의 생육에 미치는 영향을 paper disc method로 측정한 생육저해환의 결과에서 대부분의 김치 재료 methanol 추출물이 우수한 항균성을 나타낸 것과 같이 농도별 생육 곡선을 측정한 결과에서도 미약하지만 모든 추출물에서 생육 억제 효과를 나타내었다. 최소저해농도(MIC)는 고춧가루 추출물이 L. monocytogenes에 대하여 500 $\mu$g/mL로 가장 낮은 값을 보였다.