• 한국식품영양학회지
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• 제11권1호
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• pp.36-40
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• 1998

장내 유해세균에 대한 세균성 장내 질환치료와 관련된 한약재를 항균활성 검색을 통해 우수한 효과가 인정된 빈랑을 선정하고 혐기적 broth system에서 각 용매별 분획물의 6종의 장내 유해세균에 대한 항균활성을 측정하였으며 그 항균물질을 column chromatography법에 의해 부분 정제하였다. 빈랑의 경우, n-hexane을 제외하고 각 분획에서 뛰어난 항균력을 나타내었으며, 특히 ethylacetate 분획의 항균활성이 뛰어났다. 빈랑의 ethylacetate 분획은 Sephadex G-200 clumn chromatography에 의한 30기 분획 중 5번에서 7번까지의 분획에서 강한 항균활성을 나타내었으며 Silica gel column chromatography에 의한 40개 분획 중에서 20번 분획에서 항균활성을 보였다.

• 한국식품영양과학회지
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• 제36권3호
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• pp.255-259
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• 2007

The solvent extracts of Oenothera laciniata, which were extracted by using several solvents with different polarities, were prepared for utility as a natural preservative. The O. laciniata extract by 80% ethanol was sequentially fractionated with n-hexane, dichloromethane, ethylacetate, and butanol. The antibacterial activities and cell growth inhibition were investigated on each strain with the different concentrations of O. laciniata extracts. Antibacterial activities were shown in ethanol, ethylacetate, and butanol fraction of O. laciniata. However n-hexane, dichloromethane and water fraction showed weak antibacterial activity against the tested microorganisms. Among the five fractions, ethylacetate fraction showed the highest antibacterial activities against microorganisms tested, such as Bacillus cereus, Listeria monocytogenes, Staphylococcus aureus, Escherichia coli, Salmonella Enteritidis and Salmonella Typhimurium. The polyphenolic compounds widely occurring in the traditional medicine plants have been reported to possess high antibacterial activity. The polyphenolic compounds from ethanol, n-hexane, dichloromethane, ethylacetate, butanol, and water fraction were 63.96 mg/g, 8.49 mg/g, 28.11 mg/g, 172.64 mg/g, 114.56 mg/g, and 34.91 mg/g, respectively. There are some relationships between antibacterial activity and polyphenol content in natural plant. The ethylacetate fraction could be suitable for the development of a food preservative.

• Plant Resources
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• 제8권2호
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• pp.145-154
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• 2005

The antimicrobial effect of each fraction after fractionation of an ethanol extract of leaf mustard was examined in terms of nucleic acid, chloroform, ethylacetate, and butanol. The ethylacetate fraction, which showed the strongest level of antimicrobial effect among the different ethanol extract fractions of leaf mustard, was isolated and purified using silica gel column chromatography and HPLC, respectively, to obtain a single antimicrobial substance called KLM-1. The antimicrobial effect of this substance was 10 times higher than that of the ethylacetate fraction. A further study is on the way to confirm the structure of the antimicrobial substance KLM-1 through LC/Mass and NMR.

• Biomolecules & Therapeutics
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• 제9권1호
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• pp.51-54
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• 2001

Bufonis Venenum is a toad venom and its main components are bufadienolides, namely resibufogenin, bufalin and cinobufagin. The desensitizing effect of Bufonis Venenum is useful for the treatment of the premature ejaculation in Chinese medicine. But, minor components of Bufonis Venenum cause problems such as topical burring, pain, and erectile dysfunction. To clarify and eliminate the components responsible for these side effects, we prepared two extracts of Bufonis Venenum with either 70% ethanol or ethylacetate and tested their pharmacological effects. The extract of Bufonis Venenum with 70% ethanol produced pain response in rat hind paw, and exhibited contraction of rabbit corpus cavernosal muscle in vitro. On the other hand, the ethylacetate extract did not cause pain and smooth muscle contraction. The desensitizing effect of the ethylacetate extract was similar to that of the 70% ethanol extract. In conclusion, these results show that the extract of Bufonis Venenum with ethylacetate does not have the components causing side effects and deserve further study for therapeutic potential in premature ejaculation in men.

• 한국응용과학기술학회지
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• 제12권1호
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• pp.115-118
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• 1995

Hexyltriphenylphosphonium-TCNQ(HTPP-TCNQ) complex for preparing organic thin film by Langmuir-Blodgett technique was synthesized from LiTCNQ and Hexyltriphenylphosphonium bromide. The structure of the new complex was confirmed by $^{1}H$ NMR, $^{31}P$ NMR, IR, UV spectroscopies, TGA and elemental analysis. A stability to spreading solvent, which is acetonitrile, ethylacetate, ethanol and acetonitrile-ethylacetate(1:1 v/v), of HTPP-TCNQ complex was investigated by UV-visible spectrophotometer. The complex was stabilized in acetonitrile, ethylacetate, aceton, acetonitrile-ethylacetate (1:1 v/v) for 6 h.

• 한국식품영양과학회지
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• 제27권4호
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• pp.574-584
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• 1998

Antimicrobial activities, extraction yields and chemical compositions of the extract from the powder of vacuum dried Smilax china root on various solvents were investigated. Antimicrobial activities against. A rhizogenes, A. tumefaciens, C. utilis, S. cerevisiae, B. megaterium, B. subtilis and E. coli were measured by disc diffusion method. Methanol, chloroform, ethylacetate and butanol extracts exhibited potent antimicrobial activities against B. megaterium and B. subtilis. Also, methanol, ethylacetate and butanol extracts had the activities against A. rhizogenes, and chloroform and ethylacetate extracts against A. tumefacciens. The extraction yields were 13.10%, 8.71%, 2.73%, 0.83%, 0.54% and chemical compositions of their extracts were very different according to the kinds of solvents. The main chemical groups of ethylacetate, methanol, chloroform and butanol extracts were 45.99% phenolics, 36.10% acids, 29.13% phenolics and 18.96% phenolics, respectively.

• 한국자원식물학회지
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• 제24권1호
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• pp.10-16
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• 2011

본 실험은 인진으로 쓰이는 사철쑥과 더위지기의 항미생물활성을 검정한 것으로 추출용매에 따른 항미생물활성은 gram양성균 3종과 gram음성균 2종 모두에서 ethylacetate 추출물들이 ether추출물들보다 전반적으로 높았다. 실험미생물 중 B. subtilis와 B. cereus에 대한 추출물들의 활성이 다른 실험미생물에 비하여 강하게 나타났으며 더위지기 추출물들이 사철쑥 추출물들에 비하여 높은 활성을 보였다. 추출용매에 따른 최소저해농도는 ethylacetate추출물이 ether추출물보다 낮은 농도에서 대부분의 미생물들의 생육을 억제하였고, 더위지기와 사철쑥 부위별로는 잎과 줄기에서 잎에 비하여 낮은 농도에서 미생물들의 생육을 억제하였으며 더위지기 추출물들의 최소저해농도가 사철쑥 추출물들보다 낮았다.총 폴리페놀함량은 사철쑥 잎과 줄기 추출물에서 27.57 mg/g으로 가장 높게 나타났으며 대체로 잎과 줄기 추출물에서 잎 추출물에서보다 높은 함량을 나타내었다.

• 한국자원식물학회지
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• 제21권4호
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• pp.292-298
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• 2008

본 실험은 전자공여능에 따른 $IC_{50}$을 살펴본 것으로 ethylacetate로 추출한 사철쑥 잎추출물에서 1.74${\mu}g/ml$, 잎과 줄기추출물에서 2.24${\mu}g/ml$, 더위지기 잎추출물에서 1.81${\mu}g/ml$, 잎과 줄기추출물에서 1.56${\mu}g/ml$로 가장 낮은 농도를 나타내었 으며 다음으로 ether추출물, methanol추출물, water추출물 순이었으며 hexane추출물에서는 전자공여능이 뚜렷이 나타나지 않았다. ethylacetate와 ether 추출물의 DPPH free radical 소거능을 기준으로 더위지기가 사철쑥에 비하여 높은 항산화활성을 나타내었다. 각 pH 조건에서 아질산염 소거능은 전반적으로 비극성 용매의 추출물보다는 극성 용매인 methanol추출물과 ethylacetate 추출물에서 높은 소거능을 보였다. pH 1.2에서 ethylacetate추출물은 53.75${\sim}$84.25%로 가장 높은 소거능을 나타내었으며 methanol추출물과 hexane추출물에서도 비교적 양호한 소거능을 보였고, water추출물과 ether추출물에서는 소거능이 확실히 나타나지 않았다. 3일간 저장한 linoleic acid 기질에 대한 추출물별 항산화활성은 ethylacetate추출물에서 367${\sim}$423meq/kg로 가장 높게 나타났으며, hexane, methanol, water, ether추출물순이었고 더위지기가 사철쑥에 비하여 조금 높은 활성을 보였으며 잎추출물과 잎과 줄기추출물사이의 차이는 유의적이지 않았다.

• KSBB Journal
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• 제26권2호
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• pp.165-171
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• 2011

Fractional solvent extraction by organic solvents such as hexane, chloroform, ethylacetate, and butanol was carried out using 70% ethanol extract of apple flower leaves. Biological activities including antioxidant, whitening, antimicrobial and anti-wrinkle activities were investigated and bio-active materials of the extracts were identified using GC/MSD. Among the tested solvent fractions, ethylacetate fraction showed the highest total polyphenol content (1218.94 ${\mu}g/mL$), and flavonoid (140 ${\mu}g/mL$). The DPPH radical scavenging activities was over 80% at a dry matterbased concentration of 200 ${\mu}g/{\mu}L$ and SOD-like activity was over 90% at 50 ${\mu}g/mL$ concentration in ethylacetate fraction that was slightly lower than of ascorbic aicd. Tyrosinase inhibition activity related to skin-whitening was over 60% by ethylacetate fraction of 100 ${\mu}g/mL$. As an anti-aging effect, elastase inhibitory activity was about 45% in ethylacetate fraction. Also, it showed a significantly antimicrobial activity against P. acenes. From GC/MSD analysis, a characteristic peak of high content in ethylacetate fraction was identified as kaempferol, which has been reported as a bioactive compound.

• 대한화장품학회지
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• 제33권3호
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• pp.145-152
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• 2007

본 연구에서는 함초 추출물(나문재 및 퉁퉁마디)의 항산화능을 조사하였다. 나문재 추출물의 free radical(1,1-diphenyl-2-picrylhyazyl, DPPH) 소거활성($FSC_{50}$)은 100 % ethanol 추출물(329.33 ${\mu}g/mL$) < 50% ethanol 추출물(40.73) < ethylacetate 분획(13.87) < ethylacetate 분획에서 당을 제거시킨 aglycone 분획(7.80) 순으로 증가하였다. 퉁퉁마디의 경우, free radical 소거활성은 ethylacetate 분획 및 aglycone 분획이 각각 23.21 및 28.50 ${\mu}g/mL$이었다. Luminol-의존성 화학발광법을 이용한 $Fe^{3+}-EDTA/H_2O_2$ 계에서 생성된 활성산소종(reactive oxygen species, ROS)에 대한 나문재 추출물의 총항산화능은 50 % ethanol 추출물($OSC_{50}$, $0.99{\mu}g/mL$) < ethylacetate 분획(0.05) < aglycone 분획(0.03)순으로, aglycone 분획에서 가장 큰 활성을 나타내었다. 퉁퉁마디의 경우, ethylacetate 분획 및 당을 제거시킨 aglycone 분획의 ROS 소거활성은 각각 0.10 및 0.20 ${\mu}g/mL$이었다. 나문재 및 퉁퉁마디 추출물에 대하여 rose-bengal로 증감된 사람 적혈구의 광용혈에 대한 억제 효과를 측정하였다. 100 % ethanol 나문재 추출물의 경우 농도 의존적($1{\sim}100{\mu}g/mL$)으로 광용혈을 억제하였다. 특히 ethylacetate 분획에서 당을 제거시킨 aglycone 분획은 50${\mu}g/mL$ 농도에서 $\tau_{50}$이 310 min으로 매우 큰 세포보호 효과를 나타내었다. 퉁퉁마디의 경우는 ethylacetate 분획에서 비교적 큰 세포보호 활성을 나타내었다. 이상의 결과들은 나문재 추출물이 $^1O_2$ 혹은 다른 ROS를 소광시키거나 소거함으로써 그리고 ROS에 대항하여 세포막을 보호함으로써 생체계, 특히 태양 자외선에 노출된 피부에서 항산화제로서 작용할 수 있음을 가리킨다.