• Culinary science and hospitality research
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• v.23 no.5
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• pp.151-158
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• 2017

In this study, the Rhus chinensis Mill was divided into bark and inner bark. The antimicrobial activity and the antioxidative activity of the extracts were investigated by using the organic solvent fractions after the extraction and concentration with ethanol. This study showed the possibility of functional materials such as raw materials for cosmetics and food supplements. This study was the antimicrobial activity and antioxidant activity of five microorganisms (S. aureus, E. coli, B. subtilis, P. aeruginosa, and P. ovale). The following conclusions were obtained. First, the antimicrobial activity of B. subtilis was found to be high in the ethanol extract of. Second, DPPH scavenging activity was 86.4% free radical scavenging activity at 2.5 mg/mL bark part and 61.9% free radical scavenging activity at 2.5 mg/mL in inner Rhus chinensis Mill bark part. The ABTS scavenging activity was 79.2% free radical scavenging at 1 mg/mL bark fraction and 63% free radical scavenging activity at 1 mg/mL in inner bark, and bark showed higher antioxidant activity than inner bark. These results suggested that the antimicrobial activity and antioxidant activity of Rhus chinensis Mill extract can be used as a natural material. Specific and diverse physiological activity studies are expected in the future.

• Archives of Pharmacal Research
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• v.25 no.6
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• pp.860-864
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• 2002

In this study the composition and antimicrobial properties of essential oils obtained from Origanum onites, Mentha piperita, Juniperus exalsa, Chrysanthemum indicum, Lavandula hybrida, Rosa damascena, Echinophora tenuifolia, Foeniculum vulgare were examined. To evaluate the in vitro antibacterial activities of these eight aromatic extracts; their in vitro antimicrobial activities were determined by disk diffusion testing, according to the NCCLS criteria. Escherichia coli (ATTC 25922), Staphylococcus aureus (ATCC 25923) and Pseudomonas aeruginosa (ATTC 27853 were used as standard test bacterial strains. Origanum onites recorded antimicrobial activity against all test bacteria, and was strongest against Staphylococcus aureus. For Rosa damascena, Mentha piperita and Lavandula hybrida antimicrobial activity was recorded only to Staphylococcus aureus. Juniperus exalsa, and Chrysanthemum indicum exhibited antibacterial activities against both Staphylococcus aureus and Escherichia coli. We also examined the in vitro artimicrobial activities of some components of the essential oils and found some components with antimicrobial activity.

• Journal of Microbiology and Biotechnology
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• v.11 no.4
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• pp.577-584
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• 2001

An antimicrobially active bacterium which was identified as Bacillus brevis, was isolated from kimchi. The antimicrobial activity was found against various Gram-positive and Gram-negative bacteria including some pathogens food-spoilage microorganisms, and some yeast strains. The antimicrobial activity was especially strong against Bacillus anthracis and Shigella dysenteriae. The strong activity was observed during an early stationary phase in the culture when incubated at $37^{\circ}C$ with initial medium pH of 6.8. The antimicrobial activity was found to be stable at $90^{\circ}C$ for 30 min and in the pH range of 3-11, and it was insensitive to organic solvents including acetone, acetonitrile, ethanol, and methanol. Analysis of the bacterocin on tricine-sodium dodecyl sulfate-polyacrylamide gel suggested a molecular mass of approximately 4.5-6.0 kDa. The antimicrobial substance was characterized as a bacteriocin, because of its proteinaceous nature and low molecular weight. The bacteriocin could potentially be used as a food preservative, because of its thermostable property and broad antimicrobial spectrum.

• Journal of Food Hygiene and Safety
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• v.10 no.3
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• pp.139-145
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• 1995

In order to develop a natural food preservative, the root bark of Morus alba was extracted with several solvents, and then antimicrobial activity was investigated. The optimum extracting condition for the antimicrobial substance from the sample, minimum inhibitory concentration (MIC) of the extracted substance against microorganisms were also examined. The antimicrobial activity of the ethanol extract form the sample was stronger than those of the extracts by the other solvents such as water, methanol. ethyl acetate and acetone. The optimum extracting condition for antimicrobial substance from the sample was shaking extraction twice for 5 hours at room temperature in case of 7 times of absolute ethanol added to the crushed root bark of Morus alba. The ethanol extract from the root bark of Morus alba had strong B. cereus, L. monocytogenes and S. aureus. Especially, Bacillus species was the most susceptible to the extracted substance. The ethanol extract showed antimicrobial activity against Gram negative bacteria(MIC, 160~1600 ug/ml) and yeasts(MIC, 1600 ug/ml) such as C. albicans and S. acidifaeciens. The extract also showed growth inhibition against molds such as A. niger, A. parasiticus, A versicolar and T. viride.

• Journal of Physiology & Pathology in Korean Medicine
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• v.28 no.4
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• pp.390-395
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• 2014

Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Listeria. monocytogenes and Bacillus cereus are pathogenic bacteria that should not be detected in cosmetics and foodstuffs. Therefore, we first investigated the antimicrobial activities of extracts of Scutellariae Radix(SR), Coptidis Rhizoma (CR) and salicylic acid(SA) in these pathogenic microorganisms. Although SA has been known to exhibit anti-inflammation and antimicrobial activity against pathogenic microorganisms, a high concentration of SA may cause serious side effects such as skin redness, skin burning, peeling or tissue damage. Hence, we focused on diminishing side effects followed by treatment of a high concentration of SA and investigated whether the combinations of SA with various concentrations(25-400 mg/mL), SR and CR with a concentration(100 mg/mL) which did not show antimicrobial activity against E. coli and P. aeruginosa exhibited meaningful antimicrobial effect against both strains. In our results, the combinations of SA with the lowest concentration(25 mg/mL), SR(100 mg/mL) and CR(100 mg/mL) exhibited significant antimicrobial activity against E.coli in comparison to SA alone(25 mg/mL) showing no antimicrobial activity. Moreover, the combinations of SA (100 mg/mL), SR and CR showed seven times higher antimicrobial activity against E. coli than SA alone(100 mg/mL) and exhibited a significant antimicrobial activity in comparison to ampicilin (p<0.05). The combinations of SA(100 mg/mL), SR and CR showed two times higher antimicrobial activity against P. aeruginosa than SA alone. Therefore, these results indicated that the combinations of SR, CR and SA with low concentration expressed the synergistic antimicrobial effect against E. coli and P. aeruginosa and showed great potential as an antimicrobial agent.

• The Journal of Advanced Prosthodontics
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• v.8 no.3
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• pp.172-180
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• 2016

PURPOSE. The purpose of this study was to analyze the antimicrobial, antioxidant activity and cytotoxicity of Dendropanax morbifera $L{\acute{e}}veille$ extract for assessing whether Dendropanax morbifera $L{\acute{e}}veille$ can be used for the development of natural mouthwash and denture cleaning solution. MATERIALS AND METHODS. The extract was obtained from branches of Dendropanax morbifera $L{\acute{e}}veille$. The solvent fractions were acquired by fractionating Dendropanax morbifera $L{\acute{e}}veille$ extract using n-hexane, ethyl acetate, chloroform and butanol solvent. Paper disc test was used to evaluate the antimicrobial and antifungal activity of Dendropanax morbifera $L{\acute{e}}veille$ extract and solvent fractions against Streptococcus mutans and Candida albicans. The analysis of antioxidant activity was carried out through DPPH radical scavenging assay. The cytotoxicity of Dendropanax morbifera $L{\acute{e}}veille$ extract was analyzed through MTT assay using normal human oral keratinocytes. RESULTS. Dendropanax morbifera $L{\acute{e}}veille$ extract showed antimicrobial activity against Streptococcus mutans and especially Candida albicans. The solvent fractions of Dendropanax morbifera $L{\acute{e}}veille$ showed strong antimicrobial activity against Streptococcus mutans and Candida albicans in n-hexane and butanol solvent fraction, respectively. Dendropanax morbifera $L{\acute{e}}veille$ extract also showed outstanding antioxidant activity. Butanol, ethyl acetate, and chloroform solvent fraction of Dendropanax morbifera $L{\acute{e}}veille$ tended to have increased antioxidant activity as the concentration increased. Dendropanax morbifera $L{\acute{e}}veille$ extract showed high cell survival rate in cytotoxicity test. CONCLUSION. Dendropanax morbifera $L{\acute{e}}veille$ extract turned out to have antimicrobial, antioxidant activity and cytophilicity. Based on these results, it is expected that Dendropanax morbifera $L{\acute{e}}veille$ is applicable as an ingredient for natural mouthwash and denture cleanser.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.60 no.3
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• pp.366-373
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• 2015

This study was conducted to clarify the antimicrobial effect, antioxidant and tyrosinase inhibitory activities of the biological composition having the Phytolacca americana, and to enhance the natural materials utilization of foods and cosmetics. The antimicrobial activities of the different parts of P. americana were evaluated using the agar diffusion test. The antimicrobial activity of P. americana was relatively high in Malassezia furfur known as a skin fungi and Vibrio parahaemolyticus compared to Escherichia coli and Staphy-lococcus epidermidis. However, the antimicrobial activity in Vibrio parahaemolyticus did not show at all parts of P. americana. Both the DPPH radical scavenging activity and ABTS radical scavenging activity have been increased with the higher concentration of methanol extract. In particular, leaf extract of P. americana exhibited the highest activity both ABTS radical scavenging activity and DPPH radical scavenging activity. The nitrite scavenging activity was decreased when the pH was changed from pH 1.2 to pH 6.0. The highest nitrite scavenging activity was exhibited from the methanol extract of fruit, followed by root, stem, and leaf at pH 1.2. However, the nitrite scavenging activity at pH of 6.0 was not almost detected. All plant parts of P. americana showed tyrosinase inhibitory activity. The highest activity was found in the stem, and followed by root, leaf, and fruit in order. These tyrosinase inhibitory activity was progressively increased in a concentration-dependent manner. In this experiment on the methanol extracts of different organ from P. americana, we confirmed that the extract of P. americana showed potent tyrosinase inhibitory activity. Taken together, we conjectured that the P. americana had the potent biological activities, therefore this plant having various functional components could be a good material for development into source of natural food additives and cosmetics.

• Food Science and Preservation
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• v.6 no.1
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• pp.99-103
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• 1999

Corni Fructus extracts were investigated for antimicrobial and antioxidative activities. In the methanol, ethanol, water extracts from Corni Fructus, antimicrobial activity of the water extract was stronger than the others. Antimicrobial activities were strong against microorganisms such as Streptococcus mutans, Bacillus subtilis, Pseudomonas aeruginosa, Salmonella typhimurium, Escherichia coli and Escherichia coli O-157, the activity against Escherichia coli O-157 was the strongest of all the microorganisms. The growth of all the microorganisms were completely inhibited to 48 hours in the 150${\mu}\ell$ per $m\ell$ of culture media. the shape of E. coli O-157 treated with Corni Fructus water extract was expended and its cellular surface was collapsed severely. When Corni Fructus water extract of 200${\mu}\ell$ was treated, hydrogen donating effect was more than 90%, and antioxidative activity using linoleic acid was similar to 0.1% BHT at the concentration of 50${\mu}\ell$.

• 한국생물공학회:학술대회논문집
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• 2000.11a
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• pp.247-249
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• 2000

Antimicrobial activity of sophorolipid produced by Candida bombicola ATCC 22214 was investigated, Minimum inhibitory concentration of sophorolipid to Propionibacterium acne and Bacillus subtilis were 0.5 ppm and 4 ppm, respectively. However no antimicrobial activity to E. coli was detected. Indicating the antimicrobial activity of sophorolipid only toward gram positive bacteria. Antifungal activity of sophorolipid was also detected in the hyphae growth assay for Botrytis cinerea. Malate dehydrogenase, a cytoplasmic enzyme, of B. subtilis was remarkably increased with the sophorolipid treatment, indicating the leakage of membrane by sophorolipid. This result shows the potentials of sophorolipid as mild, non-toxic antimicrobial agent.

• Korean Journal of Human Ecology
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• v.5 no.1
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• pp.42-47
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• 2002

Antimicrobial activity of silk and cotton fabrics dyed with gromwell colorants was examined by shake flask method. The effects of bacterial reduction rate on dye uptake and mordanting were explored. The silk(K/S value 8) and cotton fabric (K/S value 4) dyed with gromwell colorants showed high bacterial reduction rate of 99 % and 88 %, respectively. Post-mordanted silk fabric increased at K/S value, also showed higher bacterial reduction rate than unmordanted. But the effects of antimicrobial activity on mordants showed respectively different results. Pre-mordanted cotton fabric except Sn mordant increased at K/S value, but it was not significant. Pre-mordanted cotton fabric showed significantly higher bacterial reduction rate than unmordanted. Therefore, it was considered that dye uptake of cotton fabric dyed with gromwell colorants and mordants were involved in the bacterial reduction rate. It was concluded that gromwell colorants had antimicrobial activity.