• Journal of Oral Medicine and Pain
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• v.21 no.1
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• pp.123-131
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• 1996

Bacteremia occurs in a wide variety of clinical procedures in oral cavity. Reduction of the number of causative microorganisms of infective endocarditis in oral cavity by local administration of antimicrobial agents decreases the magnitude of bacteremia and possibility of infective endocarditis. The effects of chlorhexidine on Streptococcus sanguis, Streptococcus mitis, Streptococcus mutans, Streptococcus oralis, Streptococcus gordonii, Staphylococcus aureus, and Staphylococcus epidermis were investigated by measurement of turbidity. The effects of 0.1% chlorhexidine gargling for 7 days on oral bacterial flora, total streptococci, S. mutans, S. aureus, and S. epidermis in whole saliv a of 7 healthy human subjects, were investigated by measurement of Colony Forming Units (CFU). The obtained results were as follows : 1. Chlorhexidine showed significant antimicrobial effects on Streptococcus snaguis, Streptococcus mitis, Streptococcus mutans, Streptococcus oralis, Streptococcus gordonii, Staphylococcus aureus, and Staphylococcus epidermis. However, the effects on S. sanguis and S. gordonii were not apparent compared with other microorganisms. 2. Oral gargling of 0.1% chlorhexidine decreased the CFU values of normal oral bacterial flora, total streptococci, S. mutans, S. aureus, and S. epidermis in whole saliva. The antimicrobial effects were significant after 4 days of chlorhexidine gargling. 3. Local antimicrobial administration in addition to systemic antibiotic prophylaxis can be highly recommended as an effective adjunct regimen for prevention of infective endocarditis.

• Herbal Formula Science
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• v.27 no.4
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• pp.257-267
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• 2019

Objectives: The purpose of this study was to establish experimental evidence for the antimicrobial effects of 51 herbal formulae commonly used in traditional Korean medical institutions. Methods: The antimicrobial activities of herbal formulae were screened using the disc diffusion method against 10 pathogenic microorganisms (Bacillus cereus, Staphylococcus aureus, Listeria monocytogenes, Vibrio parahaemolyticus, Escherichia coli DH5α, E. coli O157, Salmonella enteritidis, Yersinia enterocolitica, Shigella flexneri, and Helicobacter pylori). Of the 51 herbal formulae, 13 herbal formulae with antimicrobial activity were selected and their dose-dependency were confirmed. Results: Nine herbal formulae, including Gyeji-tang, Dangguisu-san, Saengmaek-san, Samul-tang, Ssanghwa-tang, Socheongryong-tang, Yukmijihwang-tang, Jakyakgamcho-tang, and Paljung-san, presented antibacterial activity against B. cereus. The effects of Saengmaek-san and Paljung-san was sustained for 48 hr. On L. monocytogenes, Dangguisu-san and Hyangsapyeongwi-san showed antimicrobial activity, but only Hyangsapyeongwi-san maintained the activity for 48 hr. Thirteen herbal formulae such as Galgeun-tang, Gyeji-tang, Dangguisu-san, Mahwang-tang, Banhasasim-tang, Saengmaek-san, Socheongryong-tang, Yukmijihwang-tang, Jakyakgamcho-tang, Cheonwangbosim-dan, Palmijihwang-tang, Paljung-san, and Hwanglyeonhaedok-tang showed antimicrobial activity against V. parahaemolyticus, and the activity was maintained for 48 hr. The 51 herbal formulae did not show any antimicrobial activity against seven strains such as E. coli DH5α, E. coli O157, S. aureus, S. enteritidis, Y. enterocolitica, S. flexneri, and H. pylori. Conclusions: Nine, two, and thirteen herbal formulae showed antimicrobial activities against B. cereus, L. monocytogenes, and V. parahaemolyticus in a dose-dependent manner, respectively. The results of antimicrobial activity of 51 herbal formulae against 10 microorganisms might be used as the basis for new application of herbal formulae.

• Journal of Microbiology and Biotechnology
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• v.17 no.3
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• pp.530-533
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• 2007

It has been well known that the use of Saccharomyces cerevisiae can cause fungemia in critically ill patients and flavone shows an antimicrobial effect on S. cerevisiae. Therefore, we have investigated the activities of thirteen flavone analogues on S. cerevisiae in our studies. Because flavonoids including flavones have antioxidative effects, we try to carry out the activity studies of flavone analogues in vitro and in vivo. In addition, the relationships between the structures of flavone analogues and their biological activities, such as antimicrobial and antioxidative effects, were elucidated using Comparative Molecular Field Analysis calculations. Of the flavone analogues tested here, 3,2'-dihydroxyflavone showed both good antimicrobial and antioxidative activities.

• Korean Journal of Veterinary Research
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• v.43 no.1
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• pp.113-120
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• 2003

The antimicrobial effect of ${\beta}$-lactam antibiotics, which had ${\beta}$-lactamase inhibitor activity, on Staphylococcus aureus isolated from mastitis was investigated in this study. Out of 166 isolates, 99 isolates (59.6%) produced ${\beta}$-lactamase, and 98 isolates of 99 were ${\beta}$-lactamase positive in above $12.5{\mu}g/m{\ell}$ MIC of penicillin. In the providence distribution, ${\beta}$-lactamase production rate of 4 providence, Gangwon, Gyeonggi, Chungcheong, and Jeolla was 100%, 65.7%, 58.8%, and 50.0%, respectively. Antibiotic activities of ${\beta}$-lactam antibiotics against lactamase positive isolates also were investigated. Antimicrobial effects of ampicillin/sulbactam or amoxicillin/clavulanic acid treated group were better than ampicillin or amoxicillin treated group. In antimicrobial effects on intracellular S aureus, there was no difference 1 hour and 4 hour treatment in control, ampicillin, and amoxicillin group, but in 18 hours treatment, ampicillin/sulbactam or amoxicillin/clavulanic acid had a better effect than ampicillin or amoxicillin (p<0.05).

• The Korean Journal of Community Living Science
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• v.24 no.1
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• pp.27-36
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• 2013

This study was performed to investigate the antimicrobial effect against food-borne pathogens of Sanguisorbae officinalis L. ethanol extract. The antimicrobial activity of the ethanol extract was determined using a paper disc-diffusion method and the diameter of the clear zone was measured. The diameters of the clear zone in the presence of 10 mg of the ethanol extract were the maximum against Staphylococcus aureus among the tested 4 gram-positive bacteria and Pseudomonas aeruginosa among the tested 7 gram-negative bacteria. Analysis of the minimum inhibition concentrations (MIC) showed that the ethanol extract exhibited a similar efficacy as sorbic acid, well-known chemical preservatives. The growth inhibitory effects of the ethanol extract in the concentrations of 250, 500, 1,000 and 2,000 mg/L on food-borne pathogens were determined against Staphylococcus aureus, Bacillus subtilis, Salmonella Typhimurium and Pseudomonas aeruginosa. The growth of the microorganisms was significantly (p<0.05) inhibited by the ethanol extract in the concentrations higher than 250 mg/L. Thus, the results of the present study demonstrate that the ethanol extract exhibits antimicrobial effects against food-borne pathogens, suggesting that Sanguisorbae officinalis L. could be used as natural antibacterial agent in food.

• Restorative Dentistry and Endodontics
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• v.40 no.2
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• pp.97-103
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• 2015

The first part of this study reviewed the characteristics of calcium hydroxide ($Ca(OH)_2$) and summarized the results of in vitro studies related to its antimicrobial effects. The second part of this review covers in vivo studies including human clinical studies and animal studies. The use of $Ca(OH)_2$ as an intracanal medicament represented better histological results in animal studies. However, human clinical studies showed limited antimicrobial effects that microorganisms were reduced but not eliminated through the treatment, and that some species had resistance to $Ca(OH)_2$. Most of clinical outcome studies supported that there is no improvement in healing of periapical lesions when $Ca(OH)_2$ was applied between appointments. Further studies are required for the antimicrobial effects of $Ca(OH)_2$, and search for the ideal material and technique to completely clean infected root canals should be continued.

• The Journal of Korean Obstetrics and Gynecology
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• v.20 no.2
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• pp.124-138
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• 2007

Purpose: This study was conducted to investigate the antimicrobial effects of the interior warming herbs on vaginal microbes. Methods: Staphylococcus aureus, Methicillin-resistant Staphylococcus aureus, Candida albicans and Gardnerella vaginalis were used for vaginitis-induced microbes. Lactobacillus gasseri, Streptococcus spp. and Escherichia coli HB101 were used for normal vaginal florae. And herbs for warming the interior (Zingiberis Rhizoma, Alpiniae Officinari Rhizoma, Aconiti Tuber, Anethi Fructus, Evodiae Fructus, Cinnamomi Cortex Spissus, Caryophylli Flos, Aconiti Tube, Zanthoxyli Pericarpium, Piperis Longi Fructus, Piperis Nigri Fructus) were used in this study. Antimicrobial activities were tested by the change of optical densities (OD) and colony test in vitro. Results: In the results of vaginitis-induced microbes, Anethi Fructus was decreased the OD values on MRSA and Gardnerella vaginalis and Aconiti Tuber was decreased on MRSA. There were no viable MRSA and Gardnerella vaginalis colony forming against Evodiae Fructus, Staphylococcus aureus and MRSA colony forming against Piperis Longi Fructus, Staphylococcus aureus colony forming against Piperis Nigri Fructus and MRSA colony forming against Zanthoxyli Pericarpium. In the results of normal vaginal florae, Zingiberis Rhizoma was decreased the OD values on Streptococcus spp. and all normal vaginal florae were showed viable colony forming against all experimental herbs. Conclusion: According to these results, we can suggest that some kinds of interior warming herbs have antimicrobial effects on vaginal microbes. So there might be needed to make furthermore studies to seek the herbs which have selective antimicrobial effect on pathologic vaginal microbes.

• Korean Journal of Food Science and Technology
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• v.43 no.4
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• pp.518-523
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• 2011

The aim of this study was to evaluate the antimicrobial activities of leek and garlic extract juice and powder against Escherichia coli, Salmonella enteritidis, and Staphylococcus aureus in a single strain and a mixed strains system. Garlic juice and powder showed higher antimicrobial activity against Sta. aureus than that of E. coli or S. enteritidis. The antimicrobial activities of the leek and garlic powders decreased with increasing temperature and time, but stabilized at various pHs. The antimicrobial effects of mixtures of various ratios between the leek and garlic extracts increased with an increase in garlic extract content. No synergistic effects by the leek and garlic mixtures were observed. In a mixed strains system, the antimicrobial effects of leek and garlic powder were similar to those in a single strain system.

• Korean Journal of Plant Resources
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• v.21 no.5
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• pp.352-356
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• 2008

This study was performed to investigate the antimicrobial effects of Origanum majorana L. ethanol extract against food-borne pathogens. The antimicrobial activity of Origanum majorana L. extract was determined using a paper disc method. The extract exhibited growth inhibiting activities in a concentration dependent manner on 10 species microorganisms. The extract of Origanum majorana L. showed the highest antimicrobial activity against Salmonella enteritidis. The growth inhibitory effects of Origanum majorana L. extract on food poisoning microorganisms were determined against Salmonella typhimurium and Listeria monocytogenes, gram negative and positive bacteria, respectively. The extract of Origanum majorana L. had strong antimicrobial activity against Salmonella typhimurium and Listeria monocytogenes at the concentration of $700 mg{\cdot}L^{-1}$. At this concentration, the extract of Origanum majorana L. inhibited the growth of Salmonella typhimurium and Listeria monocytogenes up to 60 and 36 hours, respectively. The results in the present study demonstrate antimicrobial effects of Origanum majorana L. ethanol extract against food-borne pathogens, suggesting that Origanum majorana L. could be an effective natural antibacterial agent in food.

• Journal of Microbiology and Biotechnology
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• v.33 no.1
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• pp.75-82
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• 2023

Lactic acid bacteria (LAB) isolated from kimchi (a traditional Korean dish typically made of fermented cabbage) can provide various health benefits, including anti-obesity, antioxidant, antiinflammatory, anticancer, and antimicrobial effects. In this study, we examined the antimicrobial and immunomodulatory effects of Lactiplantibacillus plantarum WiKim0125 cultured in de Man, Rogosa, and Sharpe (MRS) medium containing vegetable waste. Live bacterial cells were eliminated via supernatant filtration or heat treatment. The cell-free supernatant (CFS) obtained from culture broth containing kimchi cabbage waste (KCW), cabbage waste (CW), or onion waste (OW) showed significantly higher antimicrobial activity against skin pathogens (Propionibacterium acnes and Staphylococcus aureus) and foodborne pathogens (Escherichia coli and Salmonella typhimurium), with inhibition zones ranging between 4.4 and 8.5 mm, compared to that in conventional MRS medium (4.0-7.3 mm). In lipopolysaccharide-stimulated RAW264.7 cells, both supernatant and heat-inactivated Lb. plantarum WiKim0125 from culture media containing KCW and CW suppressed the production of inflammatory cytokines (72.8% and 49.6%, respectively) and nitric oxide (62.2% and 66.7%, respectively) without affecting cell viability. These results indicate that vegetable waste can potentially increase the antimicrobial and immunoregulatory potency of LAB while presenting a molecular basis for applying postbiotics to health products.