• Journal of the East Asian Society of Dietary Life
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• v.18 no.5
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• pp.797-804
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• 2008

In this study, the antioxidative and antimicrobial activities of persimmon leaf tea and green tea were assessed. The total polyphenol contents of green tea (0.5875 mg/mL) were slightly higher than those of persimmon leaf tea (0.3938 mg/mL). The electron-donating abilities (EDA) of persimmon leaf tea and green tea toward $\alpha$, $\alpha$-diphenyl-$\beta$-picyryl hydrazyl (DPPH) radical were $65.7{\pm}3.7%$ and $68.4{\pm}0.3%$, respectively, as compared to $68.6{\pm}1.1%$ for L-ascorbic acid (1%). The SOD-like activity of persimmon leaf tea ($29.7{\pm}0.9%$) was higher than that of green tea ($28.1{\pm}1.0%$). The nitrite scavenging ability was pH-dependent, highest at pH 1.2, and lowest at pH 6.0, in and persimmon leaf tea was found to exhibit more effective nitrite scavenging ability than green tea. The inhibitory effects of persimmon leaf tea and green tea against angiotensin I converting enzyme were $56.7{\pm}1.9%$ and $67.1{\pm}1.7%$, respectively. Persimmon leaf tea evidenced profound antimicrobial activities against Listeria monocytogenes, Staphylococcus aureus, Escherichia coil, and Salmonella typhimurium. These results clearly established the antioxidative and antimicrobial potency of persimmon leaf tea.

• Journal of Life Science
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• v.19 no.1
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• pp.52-57
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• 2009

This study was carried out to investigate the antioxidative and antimicrobial activities of Celastrus orbiculatus (CO). CO was extracted with methanol and then further fractionated with n-hexane (COMH), butanol (COMB), methanol (COMM) or aqueous (COMA) to get active fractions. The antioxidative activity of fractions from CO was investigated by measuring the scavenging activities of CO against DPPH radical, peroxynitrite ($ONOO^-$) and reactive oxygen speicies (ROS). Among the various solvent fractions, the COMB showed a marked scavenging effect against DPPH radical, peroxynitrite ($ONOO^-$) and reactive oxygen species(ROS). The antimicrobial activity was increased in proportion to its concentration by the paper disk method. Among the various solvent fractions, the COMM and COMB fractions of CO showed strong antimicrobial activities. The results suggest that The CO may be suitable for development as a food preservative and alternative antioxidant.

• Bulletin of the Korean Chemical Society
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• v.25 no.2
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• pp.195-197
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• 2004

Methyl-4-[[(2E)-3,7-dimethyl-2,6-octadienyl]oxy]-3-hydroxybenzoate (5) has been identified from the New Zealand liverwort Trichocolea hatcheri (T. hatcheri) on the basis of spectroscopic evidence. This compound was tested for its growth inhibitory effects against tumor cell lines, using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay. It showed growth inhibition activity against Staphylococcus epidermidis (MIC, 1,000 ${\mu}$g/mL). These results suggest that compound 5 possesses antitumoral , antimicrobial and antioxidative activities.

• Journal of the Korean Society of Food Science and Nutrition
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• v.35 no.8
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• pp.967-972
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• 2006

The antioxidative and antimicrobial activities were determined on the mushroom (Sarcodon aspratus) extracts in order to find out new food functional components. The antioxidative activities of water and ethanol extracts from the Sarcodon aspratus were measured by peroxide values (POV), electron-donating ability (EDA) using 1,1-diphenyl-2-picryl hydroxyl (DPPH), nitrite-scavenging ability and superoxide dismutase-like activity (SODA) by pyrogallol. The antioxidative activity of the ethanol extract measured by POV was higher than those of the water extract, BHT, and ${\alpha}-tocopherol$. The EDA of the water extract and ethanol extract using DPPH showed the highest values of 76.94% and 73.06%, respectively. The nitrite-scavenging abilities (pH 1.2, 1,000 ppm) of the water and ethanol extracts were 72.61% and 62.69%, respectively, and the nitrite-scavenging ability of the water extract was higher than that of the ethanol extract in all pH values. The SODA of the ethanol extract was higher than that of the water extract. The Sarcodon aspratus extracts had antimicrobial effects on Listeria monocytogenes and Staphylococcus aureus.

• Korean journal of food and cookery science
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• v.31 no.5
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• pp.581-587
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• 2015

This study was conducted to investigate the antioxidative and antimicrobial activities of Korean dandelion (Taraxacum coreanum). Water extracts, ethanol extracts and methanol extracts were used to examine the free radical scavenging activity, total flavonoid content, total polyphenol content and antimicrobial activity. The free radical scavenging activity, total flavonoid, total polyphenol and total antioxidant activity of the water extracts were higher than those of the other extraction solvents. The antimicrobial activties of Korean dandelion extracts were examined on several food borne illness microorganisms using the paper disc diffusion method. Inhibition zones were observed on Staphylococcus aureus subsp. aureus, Listeria monocytogenes, Bacillus subtilis, Bacillus cereus and Escherichia coli in ethanol extracts. Inhibition zones were also observed on Listeria monocytogenes in water extracts. The physico-chemical properties of Korean dandelion tea according to the roasting time and soaking amount of tea were studied. The pH of the dandelion tea significantly decreased while the soluble solid contents significantly increased with increased roasting time (p<0.01). The lightness of the dandelion tea decreased and the turbidity increased with increased roasting time. In sensory evaluation, the sensory scores for the color, flavor and total acceptability were highest in the 40 min roasted tea. These results suggest that the water extract of Korean dandelion could be used as an antioxidative and antimicrobial functional food source. The optimum roasting time for Korean dandelion tea was 40 min at $200^{\circ}C$.

• Journal of the Korean Society of Food Culture
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• v.19 no.2
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• pp.170-176
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• 2004

The antioxidative and antimicrobial activity were carried on the Chopi(Zanthoxylum pipperitum) extracts by six kinds of solvents in order to find out new natural food additives. Six solvents were used methanol(MeOH), n-hexan(hexane), chloroform$(CHCl_3)$, ethylacetate(EtOAc), buthanol(BuOH), and water(water) and methanol extract(MEex), hexan extract(HEex), chloroform extract(CHex), ethylacetate extract(EAex), and buthanol extract(BUex), water extract(WAex). The antioxdative activities of them extracts were determined by peroxide value(POV), conjugated diene value(CDV) of corn germ oil storaged for 30 days at $60{\pm}2^{\circ}C$. These extracts were added as 0.02, 0.1, 0.2% of each extracts and compared with ${\alpha}-tocopherol$, and BHT. The antioxidative activities of 0.02% extract were as follows in decreasing order BUex > WAex, BHT, MEex > HEex, EAex, CHex > TOC, and control. While, BUex and CHex among these extracts were shown to be had antimicrobial effects on the microorganism such as Escheria coli, Salmonella typhimurium, Psedomonas aeruginosa, Staphylococcus aureus, and Listeria monocytogenes. Finally to find out the preference of chopi we had made Yugwanzageon (a kind of shallow fried meat ball)by adding chopi powder. The result were similar to control(not added chopi powder) in case of 0.1% chopi adding Yugwanzageon.(p<0.05) Therefore it was thought to be possible that chopi powder was used Yugwanzageon preperation.

• Journal of the Korean Society of Food Science and Nutrition
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• v.34 no.7
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• pp.948-952
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• 2005

The antioxidative and antimicrobial properties of the solvent extracts of 3 parts (leaf, stem, root) of Crotalaria sessiflora L. were investigated, in order to find out new natural food additives. The antioxidative activities of the extracts were determined by peroxide value (POV) and the conjugated diene value (CDV) of corn oil stored for 30 days at $60\pm2^{\circ}C$. Each part of the extracts were added as $0.02,\;0.05\%$ and then compared with BHT. The anti oxidative activities were as follows in decreasing order: BHT > LeafEX > StemEX > RootEX > control. The induction period showed that the part of the Crotalaria sessifloria L. group added with solvent extract showed a longer induction period compared with the control group. The part of Crotalaria sessiflora L. solvent extract were shown to have antimicrobial effects on the microorganism such as Bacillus subtilis, Staphylococcus aureus, Listeria monocytogenes, Salmonella Enteritidis, Pseudomonas flrourescens and Escherichia coli. Especially the effect on the Pseudomonas flrourescens was remarkable.

• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.380.2-380.2
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• 2016

The emergence of new infectious diseases, the resurgence of several infections that appeared to have been controlled and the increase in bacterial resistance have created the necessity for studies directed towards the development of new antimicrobials. In the present study, we have synthesized a novel antioxidant ZnO nanoparticle that is newly designed and prepared by simple surface modification process. Antioxidative functionality is provided by the immobilization of antioxidant 3-(3,4-dihydroxyphenyl)-2-propenoic acid (caffeic acid, CA) onto the surface of ZnO nanoparticles. Microstructure and physical properties of the ZnO@CA nanoparticles were investigated by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), infrared spectroscopy (IR) and steady state spectroscopic methods. Antimicrobial Activities of ZnO@CA nanoparticles were measured against various bacterial strains using antibacterial testing methods.

• Korean journal of food and cookery science
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• v.27 no.5
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• pp.523-530
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• 2011

This study was conducted to investigate antimicrobial, antioxidant and anticancer activities of Opuntia humifusa (OH) petal extracts. The methanol and hexane extracts of OH petals showed their highest antimicrobial activity against Clostridium perfringens. The OH petal butanol fraction had the best antioxidative peroxynitrite scavenging activity among OH petal extracts. The DPPH scavenging activity of OH petals was lower than the peroxynitrite scavenging effect. The hexane and methanol fractions at a concentration of 200 ${\mu}g$/mL inhibited proliferation >80% in four kinds of human cervical cancer cells(B16F10, HepG2, HT-29 and MCF-7). In particular, the anticancer effect against B16F10 human skin cancer cells at the same concentration was higher than that in the other cancer cells.

• Journal of Nutrition and Health
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• v.39 no.4
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• pp.366-371
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• 2006

In this study, we investigated the antioxidative and antimicrobial activities of red algae Gloiopeltis tenax (GT). GT was extracted with methanol and then further fractionated it into four different types: methanol (GTMM), hexane (GTMH), butanol (GTMB) and aqueous (GTMA) soluble fractions. The antioxidant activity of the fractions from GT was investigated by measuring the scavenging activities of GT against reactive oxygen species (ROS) and reactive nitrogen species (RNS). Among the four fractions of GT, GTMM and GTMB showed a marked scavenging effect against ROS, but they displayed very low levels of the scavenging effect against RNS. The antimicrobial activity was increased in proportion to its concentration by the paper disc method. Among the various solvent layers, the GTMM and GTMB showed strong antimicrobial activities.