• 생약학회지
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• 제27권4호
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• pp.378-382
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• 1996

We previously reported the morphological, physiochemical characteristics of Alismae Rhizoma. In this study, we examined the antimicrobial and antifungal activities of 85% ethanol and water extracts of Alismae Rhizoma using disc method. Ethanol extracts of Korean Alismae Rhizoma showed antimicrobial activity on B. subtilis and S. aureus on the concentration dependent manner, whereas, Chinese Alismae Rhizoma revealed antimicrobioal activity on E. coli and N. gonorrhoeae. The water solution(500 mg/ml) of each lyophilized powder of aqueous extracts didn't show any antimicrobial activity on B. subtilis, S. aureus and E. coli, on the contrary, they stimulated cell growth slightly. Ethanol extracts of Korean samples showed antifungal activity on A. niger, but not on C. albicans. Neither A. niger nor C. albicans were affected by Chineses samples.

• Journal of Microbiology and Biotechnology
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• 제11권2호
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• pp.281-286
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• 2001

Since the number of amino groups which are exposed by deacetylation of acetyl-D-glucosamine influences antimicrobial activity, a chitosan oligosaccharide (COS) derivative by N-conjugation of COS with asparagine, an amino acid with two amino groups, was synthesized and the antimicrobial effect on E. coli growth was compared with other COS derivatives which were N-conjugated with glycine, alanine, aspartic acid, cysteins, an methionine, and unmodified COS. The structure of asparagine N-conjugated COS (Asn-COS) derivative was identified by using a FT-IR, $^{13}C\;FT-NMR$, and an elemental analyzer. The antimicrobial activity of Asn-COS against E. coli growth was significantly improved as compared to the other COS derivatives as well as COS itself. This means that Asn-COS with two positive charges strongly interacts with the carboxyl negative charges on the bacteria cell wall. The results for Asn-COS were as follows: 100% bactericidal activity, 0.002% MIC, and no growth of E. coli during 3 days of culture time, suggesting that Asn-COS may be useful as a new antibiotic agent.

• 대한화장품학회지
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• 제27권2호
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• pp.57-58
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• 2001

Biosurfactant has antibiological activities. Due to its low toxicity, biosurfactant can be applied to human health care products. Posseing the antibiological activities as well as the surfactant properties implies that biosurfactant can be widely used in the cosmetic industry. In this presentation, applications of biosurfactant have been reviewed including the antimicrobial activities of sophorolipid. Sophorolipid, a biosurfactant produced from Candida bombicola ATCC 22214, showed antimicrobial activity against Bacillus subtilis, Staphylococcus xylosus, Streptococcus mutans, and Propionibacterium acne at 4, 1, 1, 0.5 ppm as MIC (minimum inhibitory concentration). Also 100 ppm of sophorolipid inhibited 50% of cell growth of plant pathogenic fungus, B. cinera. However, sophorolipid showed no effect on the Escherichia coli., indicating its selective antimicrobial activity depending on the cell wall structure. Treatment of B. subtilis with sophorolipid increased the leakage of intracellular enzyme, malate dehydrogenase, indicating the possible interaction of sophorolipid with cellular membrane. Between lactone-type and acid-type sophorolipid, the former showed higher antimicrobial activity.

• Natural Product Sciences
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• 제17권1호
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• pp.23-25
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• 2011

It has been shown that the butanol extract of Lonicera japonica has antimicrobial and other potentially useful biological activities. The purpose of this study was to determine the in vitro activity of Lonicera japonica compared to other antimicrobial agents against anaerobic bacteria. Specifically, the in vitro activity of the butanol extract was investigated against 104 clinical isolates of anaerobic bacteria using an agar dilution method and the results were compared to erythromycin, cefoxitin, imipenem, clindamycin, and metronidazole. It was found that Lonicera japonica and imipenem were the most active antimicrobial agents tested.

• Journal of Microbiology and Biotechnology
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• 제15권5호
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• pp.1106-1109
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• 2005

The antimicrobial effect of the wood vinegar of C. japanica sapwood and its constituents was evaluated against Ralstonia salanacearum, Phytophthora capsid, Fusarium oxysporum, and Pythium splendens. Phenols and guaiacols had a strong antimicrobial effect against four kinds of microorganisms, but methanol and acetic acid exhibited little or no antimicrobial activity.

• 한국수산과학회지
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• 제49권2호
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• pp.137-145
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• 2016

This study screened the biological activity of an acidified gill extract of the Manila clam Ruditapes philippinarum including antimicrobial, hemolytic, membrane permeabilization, and DNA-binding activity, and purified the antimicrobial material. The acidified gill extract showed potent antimicrobial activity against Bacillus subtilis and Escherichia coli without significant hemolytic activity, but showed no membrane permeabilization or DNA-binding ability. An antimicrobial material was purified from the acidified gill extract using C₁₈ reversed-phase and cation-exchange high-performance liquid chromatography (HPLC). Treatment of the purified material with trypsin completely abolished all of the antibacterial activity against Bacillus subtilis, suggesting that the purified material is a proteinaceous antibiotic. The molecular weight of the purified material was 2571.9 Da, but no primary structural information was obtained due to N-terminal blocking. A future study should confirm the primary structure. Our results suggest that the Manila clam gill contains proteinaceous antibiotics that have a role in first-line defense. This information could be used to better understand the Manila clam innate immune system.

• Journal of Microbiology
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• 제45권1호
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• pp.53-57
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• 2007

A number of essential oils from Mongolian aromatic plants are claimed to have antimicrobial activities. The essential oil of Dracocephalum foetidum, a popular essential oil used in Mongolian traditional medicine, was examined for its antimicrobial activity. Eight human pathogenic microorganisms including B. subtilis, S. aureus, M. lutens, E. hirae, S. mutans, E. coli, C. albicans, and S. cerevisiae were examined. The essential oil of Dracocephalum foetidum exhibited strong antimicrobial activity against most of the pathogenic bacteria and yeast strains that were tested; by both the agar diffusion method and the minimum inhibitory concentration (MIC) assay ($MIC\;range\;was\;26-2592{\mu}g/ml$). Interestingly, Dracocephalum foetidum even showed antimicrobial activity against methicilin-resistant Staphylococcus aureus (MRSA) strains. We also analyzed the chemical composition of the oil by GC-MS and identified several major components, including n-Mentha-1,8-dien-10-al, limonene, geranial, and neral.

• Food Science and Biotechnology
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• 제18권2호
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• pp.513-518
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• 2009

This study was carried out to investigate the changes of yield, total phenolics, saponin content and composition, antimicrobial, and antioxidant activities of various fractions of fine ginseng root (Panax ginseng C.A. Mayer) by maceration method in the order of increasing polarity (hexane, chloroform, ethyl acetate, butanol, and water). Butanol fraction showed the highest total saponin content compare to other fractions. Hexane fraction could harvest significantly high ginsenoside Rg2, Rg1, and Rf (p<0.05). And the contents of ginsenoside Rh1, Rg3, and Rg1 showed relatively higher in the fraction of ethyl acetate than other fractions. The system of hexane-chloroform-ethyl aceate-butanol showed relatively high content of ginsenoside Re, Rd, Rc, Rb3, and Rb1. However, the last fraction of water still remained lots of Rb2 content. The fraction of water was the highest phenolics. The 1,1-diphenyl-2-picryhydrazil, superoxide, and hydroxyl radical scavenging activity of water fraction was higher than the other fractions. In antimicrobial activity, the fraction of hexane showed relatively high antimicrobial activity against Pseudomonas aeruginosa, Salmonella typhimurium, Staphylococcus aureus, Bacillus cereus, and Escherichia coli. And the fractions of the chloroform and ethyl acetate showed higher antimicrobial activities than the other samples in against P. aeruginosa and S. typhimurium.

• 약학회지
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• 제36권5호
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• pp.440-448
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• 1992

7-Substituted 2,3-dihydroxyphenazine 5,10-dioxides were synthesized by the reaction of 1,2,4-trihydroxybenzene with 6-substituted benzofuroxan derivatives which had been obtained from aniline derivativies bearing methoxy, methyl, acetyl and nitro group at the para position. 2,3-Dihydroxyphenazine 5,10-dioxide was also prepared by the reaction of 1,2,4-trihydroxybenzene with benzofuroxan. The antimicrobial activities of these phenazine dioxide were investigated in terms of minimum inhibitory concentration by the common twofold dilution technique. It was observed that the antimicrobial activity of the phenazine dioxides bearing electron releasing substituents was stronger than that of those bearing electron withdrawing substitutents. From this result, it was concluded that the antimicrobial activity of phenazine dioxide derivatives has a direct relationship with the electronic effect of the substituents.

• Journal of Microbiology and Biotechnology
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• 제12권2호
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• pp.235-241
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• 2002

Sophorolipid, a biosurfactant produced from Candida bombicola ATCC 22214, showed antimicrobial activity against Bacillus subtilis, Staphylococcus xylosus, Streptococcus mutans, and Propionibacterium acne at 4, 1, 1, 0.5 ppm, respectively. Also, 100 ppm of sophorolipid inhibited $50\%$ of cell growth of plant pathogenic fungus, Botrytis cineria. However, sophorolipid showed no effect on Escherichia coli, indicating that its selective antimicrobial activity depended on the cell wall structure. Treatment of B. subtilis with sophorolipid increased leakage of intracellular enzyme, malate dehydrogenase, indicating a possible interaction of sophorolipid with a cellular membrane. Comparing lactone-type and acid-type sophorolipids, the former showed a higher antimicrobial activity. Supplementing other surfactants showed no significant effects on the antimicrobial activity. Animal study showed that 5 g of sophorolipid per kg body weight by oral administration caused no toxicity, and sophorolipid induced no irritation on the skin. These results show potential use of sophorolipid as an active ingredient in healthcare products.