• Applied Biological Chemistry
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• v.36 no.2
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• pp.134-137
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• 1993

Yongia sonchifolia Max. has been used as raw materials of traditional Kimchi and medicinal herb in Korea. This study was performed to investigate biologically active components in the plant. First, the writer carried out the experiment of antitumor screening test against Sarcoma-180A and the cytotoxic activity against Chinese hamster V-79 cells with methanol extract of the plant. And the aqueous solution of the extract from roots of Youngia sonchifolia Max. was partitioned into n-hexane. The concentrated extract of n-hexane layer was chromatographed on silica gel column and developed with n-hexane and ethylacetate. Two yellow elutes, on concentration, were recrystallized from ethylacetate, and the $R_f$ value of TLC of the crystal was 0.43. After analysis by $^{1}H-NMR$, $^{13}C-NMR$ and MS to confirm the structure, the author could identify the compound as bauerenyl acetate, a naturally occurring pentacyclic triterpene. The crystal was colorless plate and m.p. was $280{\sim}282^{\circ}C$.

• Microbiology and Biotechnology Letters
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• v.30 no.4
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• pp.420-424
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• 2002

The purpose of this study is to investigate anticariotic activity of the ethyl acetate soluble extract of Sophora flavescens Ait. for the prevention of dental caries and glucosyltransferase activity caused by Streptococcus mutans. The fraction 5-4-3 showed strong growth inhibition activity against Streptococcus mutans (MIC, 3.13 $\mu\textrm{g}$/ml). The glucosyltransferase activity of the active fraction 5-4-3 inhibited the formation of glucan and showed 77% of the antiproliferative effect at 100 $\mu\textrm{g}$/ml (P<0.05). Two flavanones, (2S)-2'-methoxy kurarinone (1) and (+)-kurarinone (2), were isolated from the active fraction 5-4-3 of the ethyl acetate soluble extract of S. flavescens Ait. Their structures were elucidated using spectroscopic methods.

• Journal of Microbiology and Biotechnology
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• v.19 no.7
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• pp.681-684
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• 2009

This study was carried out to evaluate the inhibitory effect of Flammulina velutipes extracts on tyrosinase activity and to identify its biologically active component. The ethyl acetate and n-butanol extracts showed potent tyrosinase inhibitory activities. Subsequently, fractions of the n-butanol extract showed only a partial tyrosinase inhibitory activity. The most active compound of tyrosinase inhibitory activity was identified from the ethyl acetate extract as 1',3'-dilinolenoyl-2'-linoleoylglycerol (LnLLn) by comparing its mass, $^1H-$, and $^{13}C-NMR$spectral data with those previously reported in the literature. LnLLn showed tyrosinase inhibitory activity with an $IC_{50}$value of 16.1 ${\mu}g/ml$. These results suggest that the ethyl acetate extract of F. velutipes could be applicable for the development of a new whitening agent.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.23 no.2
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• pp.63-70
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• 1997

It has been observed that local increase in melanin synthesis or uneven distribution can cause local hyperpigmintation or spot. Pigmentary disorders are caused by various factors, including inflammation, imbalance of hormones, and genetic disorder. Recently the harmfulness of Ultraviolet radiation is increasing due to destruction of ozone layer. Excessive exposure to UV radiation caused post-inflammatory pigmentation. Most women want to avoid uneven skin pigmentation. To satisfy this desire many cosmetic companies have been developing melanogenesis inhibitors and finding promising active agents for use in cosmetic preparations for skin whitening. In cosmetic preparations, many inhibitors such as kojic acid, arbutin, ascorbic acid, and licorice extracts6 have been used as whitening purpose. Plant extracts having an inhibitory effect on melanin formation may be a good choice for cosmetic purpose because of their relatively lower side effects. Therefore, we screened 285 plant extracts for their inhibitory activity in tyrosinase. Of the plant extracts, ramulus mori extracts showed potent tyrosinase inhibition activity. We also identified the active compound in the extract.

• The Journal of Korean Medicine
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• v.29 no.3
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• pp.124-130
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• 2008

Herbal plants or traditional Oriental medicine have been considered as a potential resource of new drug development worldwide. However, traditional Korean medicine has given little effort to the field of new drug development. This study reports on a plant-derived hepatotherapeutic drug, silymarin, which has been popularly used in many countries. It was discovered as an active compound from Silybum marianum (milk thistle) which has been known as a medicinal plant having hepatoprotective properties in both European and Asian countries. While it has been used as an herbal prescription in Asia, its active compounds or scientific mechanisms were intensively studied in Europe. Currently, silymarin is one of the most powerful herbal extracts in the world, and its usage is being expanded to many other medical purposes. This report would be helpful for providing an informative example of herbal-derived drug development to Oriental doctors or scientists in the Oriental medicinal field.

• Archives of Pharmacal Research
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• v.25 no.3
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• pp.336-342
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• 2002

MeOH extract of Kochia scoparia was fractionated into $CHCl_3-$, EtOAc- and BuOH extracts and the last fraction were hydrolyzed by 3%-NaOH ($MeOH-H_2O$) to compare the bioactivities on antinociceptive and anti-inflammatory effects. Silica gel column chromatography of BuOH fraction afforded a large amount of $3-Ο-{\beta}-D-xylopyranosyl {\;}(1{\rightarrow}3)-{\beta}-D-glucuronopyranosyl$ oleanolic acid (momordin Ic, 4) and that of acid hydrolysate of BuOH fraction gave $3-Ο-{\beta}-D-glucuronopyranosyl oleanolic$ acid (momordin Ib, 3), its 6'-Ο-methyl ester (2) and oleanolic acid (1). Silica gel column chromatography of alkaline hydrolysate afforded a large amount of 4. MeOH extract and both EtOAc- and BuOH fractions were active in the rheumatoidal rat induced Freund's complete adjuvant reagent (FCA) whereas $CHCl_3$ fraction was inactive. Compound 1 and 4 showed significant activities in the same assay but oleanolic acid 3-Ο-glucuronopyranoside (3) showed no activity. These fashions were also observed in carrageenan-induced edema of the rat and in the antinociceptive activity tests undertaken in hot plate- and writhing methods. These results suggest that momordin Ic and its aglycone, oleanolic acid, could be active principles for rheumatoid arthritis.

• The Plant Pathology Journal
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• v.23 no.3
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• pp.180-186
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• 2007

The biocontrol agent, Serratia plymuthica A21-4, has been developed for controlling pepper Phytophthora blight. Serratia plymuthica A21-4 strongly inhibits the mycelial growth, zoospore formation, and cyst germination of Phytophthora capsici in vitro. The application of a cell suspension of strain A21-4 to pepper plants in pot experiments and in greenhouse successfully controlled the disease. The bacteria produced a potent antifungal substance which was a key factor in the suppression of Phytophthora capsici. The most active chemical com-pound was isolated and purified by antifungal activity-guided fractionation. The chemical structure was identified as a chlorinated macrolide $(C_{23}H_{31}O_8Cl)$ by spectroscopic (UV, IR, MS, and NMR) data, and was named macrocyclic lactone A21-4. The active compound significantly inhibited the formation of zoosporangia and zoospore and germination of cyst of P. capsici at concentrations lower than $0.0625{\mu}g/ml$. The effective concentrations of the macrocyclic lactone A21-4 for $ED_{50}$ of mycelial growth inhibition were $0.25{\mu}g/ml,\;0.25{\mu}g/ml,\;0.30{\mu}g/ml \;and\;0.75{\mu}g/ml$ against P. capsici, Pythium ultimum, Sclerotinia sclerotiorum and Botrytis cinerea, respectively.

• The Journal of Pediatrics of Korean Medicine
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• v.20 no.1
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• pp.69-83
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• 2006

We investigated the effect of Sungmagalkun-tang (SGT) on the allergy. We conformed compound 48/80-induced active systemic anaphylatic shock, anti-dinitrophenyl IgE-mediated passive cutaneous anaphylaxis and ovalbumin-induced anaphylatic shock. Also observed IL-4 and GM-CSF mRNA expression in ovalbumin-induced allergic lung tissue and RBL-2H3. Histamine release is measured in RBL-2H3. SGT inhibited active systemic anaphylatic shock, passive cutaneous anaphylaxis and ovalbumin-induced anaphylatic shock by oral administration. We observed that SGT was concentration-dependently reduced IL-4 and GM-CSF mRNA expression in ovalbumin-induced allergic lung tissue and RBL-2H3 by SGT. In addition, SGT reduced histamine release in RBL-2H3. These results indicate that SGT has anti-histamic effect and controls IL-4 and GM-CSF mRNA expression on allergy.

• Applied Biological Chemistry
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• v.46 no.3
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• pp.240-245
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• 2003

$({\pm})-2-(4-Chlorophenyl)-2-cyano-2-phenyl-1-hexanol$ (2) and acetate ester (3) were resolved by various lipases. (R) and (S)-systhane were synthesized by the resolved compound 2. The antifungal screening of (R), (S)-systhane and $({\pm})-systhane$ against wheat leaf rust and barley powdery mildew gave activity over 92% in concentration of 2 ppm, but (R)- and (S)-systhane were not more active than $({\pm})-systhane$.

• Korean Journal of Food Science and Technology
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• v.35 no.3
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• pp.483-487
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• 2003

The antimicrobial activity of the omija extract shown at pH 6.5, which was observed in the previous research, suggested that there could be active substances other than citric acid and malic acid in the Omija extract. Therefore, attempts were made to identify antimicrobial compounds in the essential oils extracted from Omija. The results of silica gel column chromatography and GC-MS revealed that terpineol and citronellol in the essential oil were the active compounds.