• 한국식품영양과학회지
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• 제27권5호
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• pp.993-999
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• 1998

Methanol extract of roots of Amblytropis pauciflora Kitagawa showed the antimicrobial activity to three test strains. Antimicrobial spectra of various extracts of Amblytropis pauciflora Kitagawa were tested against 24 strains of bacteria and fungi. The crude methanol extract inhibited the growth of 12 strains of bacteria and Asp. fumigatus with the exception of yeasts. The properties of the antimicrobial substance were very stable under heat(at 12$0^{\circ}C$), acid(pH 3.0) and alkali(pH 11.0) treatment. Only the root harvested in spring showed the antimicrobial activity. Among the components extracted by butanol, ginseng saponin Rg1 and various saponin-like materials were detected by TLC analysis using a plate of silica gel 60F254. The antimicrobial compound was purified by methanol extraction, activated charcoal column chromatography, Sep-pak(C18) pretreatment and reverse phase HPLC. The purified compound was detected at 13.520 min as a single peak(about 98% purity) through the HPLC analysis.

• 한국의상디자인학회지
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• 제3권2호
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• pp.63-73
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• 2001

Underwears treated by aroma capsule(UTA) have been known to have many advantages than normal underwears, for example, UTA has antimicrobial and deodorant properties. In this experiment, we examined antimicrobial and deodorant effect of UTA treated by rose and lemon fragrance, Mechanical properties of UTA including surface property, bending property and shear property were also tested. The results are as follows,1. The effects of antibacterial is estimated as 33% and the efficiency of deodouration is about 95 % in UTA. 2. The fragrance of UTA maintained even after 25 times washout. 3. Bending and shear properties were not changed in UTA However it decreased the coefficient of friction of the textures and the smooth surface was detected when the human skin was contacted.

• Advances in nano research
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• 제5권2호
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• pp.127-140
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• 2017

Metal nanoparticles have been intensively studied within the past decade. Nano-sized materials have been an important subject in basic and applied sciences. Zinc oxide nanoparticles have received considerable attention due to their unique antibacterial, antifungal, and UV filtering properties, high catalytic and photochemical activity. In this study, microbiological aspects of scale formation in PVC pipelines bacteria and fungi were isolated. In the emerging issue of increased multi-resistant properties in water borne pathogens, zinc oxide (ZnO) nanoparticle are being used increasingly as antimicrobial agents. Thus, the minimum bactericidal concentration (MBC) and minimum fungal concentration of ZnO nanoparticles towards pathogens microbe were examined in this study. The results obtained suggested that ZnO nanoparticles exhibit a good anti fungal activity than bactericidal effect towards all pathogens tested in in-vitro disc diffusion method (170 ppm, 100 ppm and 30 ppm). ZnO nanoparticles can be a potential antimicrobial agent due to its low cost of production and high effectiveness in antimicrobial properties, which may find wide applications in various industries to address safety issues. Stable ZnO nanoparticles were prepared and their shape and size distribution characterized by Dynamic light scattering (35.7 nm) and transmission electron microscopic TEM study for morphology identification (20 nm), UV-visible spectroscopy (230 nm), X-ray diffraction (FWHM of more intense peak corresponding to 101 planes located at $36.33^{\circ}$ using Scherrer's formula), FT-IR (Amines, Alcohols, Carbonyl and Nitrate ions), Zeta potential (-28.8). The antimicrobial activity of ZnO nanoparticles was investigated against Bacteria and Fungi present in drinking water PVC pipelines biofilm. In these tests, Muller Hinton agar plates were used and ZnO nanoparticles of various concentrations were supplemented in solid medium.

• 한국의류학회지
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• 제25권1호
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• pp.3-12
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• 2001

The dyeing powder drawn out from Dryopteris crassirhizoma by water was concentrated. Using this powder, the silk and the cotton fabrics were dyed and they measured with the K/S value, surface color, mordant quantity in order to evaluate the dyeability, antimicrobial and deodorant properties. The colorant of Dryopteris crassirhizoma was proved flavonoids by FT-IR spectrum. The K/S values of silk were much higher than those of cotton, the color yield of the silk and cotton fabric were most efficient the postmordanting method. The surface colors on the dyed fabric depended heavily upon mordants used or mordanting methods. For all cases, the value of the dyed fabric was generally dark. The chroma produced clear for the Al-mordant of silk and the Cu-mordant of cotton in the 3% concentration of mordants, the color difference was distinct when using the Fe-mordant. The K/S values of cationized cotton were much higher than cotton. The color fastness was significantly improved when mordants were added, In the case of the light fastness, Fe and Cu-mordants improved more than 1 level. The Cu-mordant showed the greatest antimicrobial and deordarant activity on both of the silk and the cotton.

• 한국축산식품학회지
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• 제40권2호
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• pp.297-310
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• 2020

This study aims to evaluate the probiotic properties of Lactobacillus brevis (L. brevis) KU200019 and the synergistic activity with prebiotics on antimicrobial activity, and the potential application as an adjunct culture in fermented dairy products. The commercial strain, L. brevis ATCC 14869 was used as reference strain. L. brevis KU200019 was showed higher viability in simulated gastric (99.38±0.21%) and bile (115.10±0.13%) conditions compared to reference strain. L. brevis KU200019 exhibited antimicrobial activity against various foodborne pathogens. The supplementation of fructooligosaccharides (FOS) enhanced viability of lactic acid bacteria (>8 Log CFU/mL) and antioxidant activity [2,2-diphenyl-2-picrylhydrazyl radical assay (DPPH) assay, 31.23±1.14%; 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assay, 38.82±1.46%] in fermented skim milk during refrigerated storage. L. brevis KU200019 was distinguished from the reference strain by its higher probiotic potential, antimicrobial activity, and higher antioxidant activity in fermented milk. Therefore, L. brevis KU200019 with FOS was demonstrated promising properties for further application in fermented dairy products with enhanced safety and quality.

• International Journal of Concrete Structures and Materials
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• 제18권3E호
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• pp.165-171
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• 2006

Environment-friendly materials are increasingly used as building construction materials nowadays, and the market share of those is growing. Accordingly, the research and developments in terms of environmental value are progressing steadily now. The main characteristics of environmental products are far-infrared radiation, negative-ion emission, electromagnetic wave shielding, and antimicrobial property. These products are often used in mortar and as spray on the finishing material. Nevertheless, there are hardly any research on the functional properties of concrete, the main material in construction field. Thus, we evaluated such basic properties of concrete as slump, compressive strength and air content while using such functional materials as sericite, wood-pattern sandstone, carbon black and nano-metric silver solution to focus on their functional properties like far-infrared radiation, negative ion emission, electro magnetic wave shielding, and antimicrobial activity in this research. The results indicated that the most useful material in the functional materials was carbon black. Sericite and nano-metric silver solution had a little effect on the functional property. Moreover, although wood-pattern sandstone had very high functional property, it exhibited too low compressive strength to be applied, to concrete as a factory product. Antimicrobial property of nano-metric silver solution in the concrete was not clear demonstrated, but if these specimens were to be aged in $CO_2$ gas for a long time, it might be apparent.

• 대한화학회지
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• 제53권5호
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• pp.542-546
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• 2009

최근 들어 은(Ag)은 항균성 및 높은 전도성 등의 특징으로 다양한 분야에서 응용되고 있다. 본 연구는 은을 첨가하여 많은 환경적 요인들로부터 눈을 보호 할 수 있는 고 기능성 안 의료용 소재를 제조 하였다. 기존 콘택트렌즈 재료와 $AgNO_3$을 혼합하여 교반한 후, 70 ${^{\circ}C}$ 중탕기에 넣고 약 1시간 동안 중 합하여 생성된 소재의 항균성과 물리적 특성을 평가하였다. 항균 테스트의 균 배양실험으로 고체배지 와 액체배지를 사용하였으며, $AgNO_3$ 첨가하였을 때 항균성이 매우 양호한 것으로 나타났다. 또한 물리 적 특성으로는 함수율 32.35%와 가시광선 투과율 88.34%를 각각 나타내었다. 본 실험 결과로 볼 때 항 균성을 가지면서 기존의 콘택트렌즈의 물리적 특성에도 부합되는 공중합체가 생성된 것으로 판단된다.

• 자연과학논문집
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• 제11권1호
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• pp.159-164
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• 1999

유기실리콘 제4급 암모늄염을 이용하여 타올에 향균제를 처리하였을 때의 향균성에 가장 많은 영향을 미치는 처리농도, 시간, 온도에 대한 향균성 변화를 비교 조사하였고, 향균처리 후 물성변화, 내세탁성을 측정하였다. 타올의 향균성에 가장 우수한 향균성을 나타내고 많은 영향을 미치는 처리농도는 3.5%이며, 처리온도 $30^{\circ}C$에서, 처리시간 10분간 향균가공 처리하여도 균감소율이 95% 이상 향균성능을 유지함을 알 수 있었다. 또한 세탁 횟수에 따른 균 감소율은 20회까지 세탁하여도 80%이상 높은 향균성을 나타내었고, 향균제 가공처리 후 측정한 타올의 인장강도 및 신도는 큰 변화가 없었다.

• 한국환경과학회지
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• 제11권1호
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• pp.33-40
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• 2002

An antimicrobial substance-producing microorganism was isolated from soil samples. Based of the taxonomic characteristics of its morphological, cultural, physiological properties and 16s rRNA sequence alignment, this microorganism was identified as Pseudomonas aeruginosa, and we named Pseudomonas aeruginosa EL-KM. The optimal culture condition for production of antimicrobial substance was 1% mannitol, 0.4% yeast extract, 0.5% Nacl, 0.2% $K_2SO_4$, 100$\mu$M $MgSO_4$.$7H_2O$, 10$\mu$M $CaCl_2$.$2H_2O$, 1$\mu$M $FeSO_4$.$7H_2O$, 1$\mu$M $MnSO_4$.$4-5H_2O$, initial pH 7 and 200 rpm at 3$0^{\circ}C$. The purification of the antimicrbial substance was performed by silica gel column chromatographys, and fraction with TLC $R_f$ 0.77 value represented good antimicrobial activity. The crude antimicrbial substance was stable within a pH range of 3-10 and temperature range of 4$^{\circ}C$-121$^{\circ}C$ autoclaving. This crude antibacterial substance acted as bacteriolytic agent against Vibrio cholerae non-Ol ATCC 25872, and also exhibited excellent properties, when the substance was demonstrated against many other gram-positive, gram-negative bacteria, yeast and fungi.

• Advances in materials Research
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• 제11권3호
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• pp.191-209
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• 2022

Very slow degradation of synthetic based polymers has created a severe environmental issue that increased awareness towards research in polymers of biodegradable property. Soy protein isolate (SPI) is a natural biopolymer used as matrix in green composites but it has limitations of low mechanical properties and high water sensitivity. To enhance mechanical properties and reduce water sensitivity of Jute-SPI composites, SPI was modified with pine rosin which is also a natural cross-linking agent. 30% glycerol on the weight basis of a matrix was used as a plasticizer. The fibre volume fraction was kept constant at 0.2 whereas the pine rosin in SPI ranged from 5% to 30% of the matrix. The effects of pine rosin on mechanical, thermal, water sensitivity and surface morphology have been characterized using various techniques. The mechanical properties and water absorbency were found to be optimum for 15% pine rosin in Jute-SPI composite. Therefore, Jute-SPI composite without pine rosin and with 15% pine rosin were chosen for investigation through characterization by Fourier transforms infrared spectroscopy (FTIR), Thermo-gravimetric analysis (TGA), X-Ray diffraction (XRD) and Scanning electron microscope (SEM). The surface morphology of the composite was influenced by pine rosin which is shown in the SEM image. TGA measurement showed that the thermal properties improved due to the addition of pine rosin. Antimicrobial test showed antimicrobial property in the composite occurring 15% pine rosin. The research paper concludes that the modification of SPI resin with an optimum percentage of pine rosin enhanced mechanical, thermal as well as water-resistant properties of jute fibre reinforced composites.