• Journal of Applied Biological Chemistry
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• 제51권2호
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• pp.57-60
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• 2008

Eight compounds, including 2 flavones, luteolin (1) and apigenin (2), 2 flavonols, kaempferol (3) and quercetin (4), and 4 flavonoid glucosides, luteolin-7-O-${\beta}$-D-glucoside (5), apigetrin (6), astragalin (7), and isoquercitrin (8), isolated from the whole herb of Sonchus oleraceus L. were analyzed on the basis of chemical and spectroscopic evidence. This was the first time to report compounds 3, 4, 6, 7 and 8 from the Sonchus oleraceus L. The antioxidant activities of the isolated flavonoids and their glucoside derivatives were evaluated by DPPH free radical-scavenging assay, showing that compounds 1, 3, 4 and 8 exhibited stronger antioxidant activities compared with ${\alpha}$, tocopherol and curcumin. Flavonoids containing more hydroxyl groups exhibited better antioxidant activities. The antioxidant activity of flavonols was superior to their corresponding flavones, and that of aglycone are more potent than their glucoside derivatives.

• Nutrition Research and Practice
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• 제1권3호
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• pp.189-194
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• 2007

This study investigated in vitro antioxidant activity of Sonchus oleraceus L. by extraction solvent, which were examined by reducing power, hydroxyl radical-scavenging activity(HRSA) and 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assays. 70% MeOH extract had the greatest reducing power while EtOH extract had the greatest HRSA. The antioxidant activity of S. oleraceus extracts was concentration dependent and its $IC_{50}$ values ranged from 47.1 to $210.5\;{\mu}g/ml$ and $IC_{50}$ of 70% MeOH, boiling water and 70% EtOH extracts were 47.1, 52.7 and $56.5\;{\mu}g/ml$, respectively. 70% MeOH extract of S. oleraceus contained the greatest amount of both phenolic and flavonoid contents. The extracts tested had greater nitrite scavenging effects at lower pH conditions. The cytotoxic activity showed that EtOH extract had the best activity against the growth of stomach cancer cell. These results suggest that S. oleraceus extract could be used as a potential source of natural antioxidants.

• KSBB Journal
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• 제32권3호
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• pp.187-192
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• 2017

In this study, we investigated the effect of Rumex axetosella, Sonchus oleraceus and Euphoibia jolkini extracts on tyrosinase activity and melanin production as natural products of whitening functional cosmetics. To measure the melanin production, 50, 100, $200{\mu}g/mL$ of Rumex axetosella, Sonchus oleraceus and Euphoibia jolkini extracts were treated on ${\alpha}-MSH$ treated B16F10 melanoma cells, respectively. Melanin contents in ${\alpha}-MSH$ treated B16F10 melanoma cells were decreased by 41.5, 51.11, and 61% in $200{\mu}g/mL$ treatment compared to none treatment, respectively. In addition, the intracellular tyrosinase activity was decreased after treatments with all extracts. Furthermore, $100{\mu}g/mL$ of Euphoibia jolkini extract was decreased 81.5% of melanin production in B16F10 melanoma cells. When the three extracts were compared, Euphoibia jolkini extract was considered to be the most functional material for whitening effect.

• Food Science and Biotechnology
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• 제17권6호
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• pp.1299-1304
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• 2008

The potential antioxidant activities of different fractions from a 70% methanolic (MeOH) extract of Sonchus oleraceus were assayed in vitro. All of the fractions exception of n-hexane showed a strong antioxidant activity, especially the ethyl acetate (EtOAc) fraction, which showed the highest 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity ($IC_{50}=19.25{\mu}g/mL$). The results of hydroxyl radical scavenging activity and a reducing power assay showed concentration dependence, the EtOAc fraction demonstrating a better result than the other fractions at the same concentration in the studies. Additionally, the fractions' total phenolic (TP) contents was measured, phenolic compounds such as tannic acid, p-coumatric acid, quercetin, epicathchin, and kaempferol being detected by high performance liquid chromatography (HPLC). Meanwhile, a regression analysis revealed a moderate-to-high correlation coefficient between the antiradical activity and the TP contents, suggesting that fractions obtained from the 70% MeOH extract of S. oleraceus are of potential use as sources of antioxidant material.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 1995년도 The 5th International Symposium on the Development of Anti Cancer Resources From Plants 및 1995년도 동양자원식물학회 정기학술 발표회
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• pp.32-32
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• 1995

• 미생물학회지
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• 제5권1호
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• pp.24-33
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• 1967

Fifty-two specimens of the infected plants were collected from areas through the country during the year of 1965. We report here 14 unrecorded specoes which were identified in this work. The results are as follows: 1. Erysiphe cichoracearum DC. (Host: Artemisia princeps PAMPAN. var. orien-talls HARA.) 2. Erysiphe cichoracearum DC. (Host: Plantago sp.) 3. Erysiphe cichoracearum DC. (Host: Sonchus oleraceus L.) 4. Erysiphe pisi DE CANDOLLE. (Host: Lespedeza sp.) 5. Erysiphe polygoni DE CANDOLLE. (Host: Clematis patens MORR et DECAIS.) 6. Microsphaera alphitoides GRIFFITHS et MAUBLANCE (Uncinula bifurcata GERARD.) (Host: Quercus serrate GERARD) 7. Microsphaera baumleri MAGNUS. (Host: Robinia pseud-acacia L.) 8. Microsphaera coryli HOMMA. (Host: Corylus heterophylla FISCH. var. japonica KOIDZUMI) 9. Podosphaera tridactyla (WALLROTH) DE BARY. (Host: Prunus leveilleana KOEHN. var. typica NAKAI) 10. Sphaerotheca fuliginea (SCHLECHTENDAHL) POLLACI. (Host: Impatiens balsamina L.) 11. Sphaerotheca fuliginea (SCHLECHTENDAHL) POLLACI. (Host: Zinnia elegans JACQ) 12. Uncinula aceris SACCARDO (Host: Acer negundo L.) 13. Uncinula fraxini MIYABE(U. salmon SYDOW) (Host: Fraxinus rhynchophyllus HANCE.) 14. Uncinula salicis (DE CANDOLLE) WINTER. (Host: Salix gracilistyla MIQ.)

• 한국환경생태학회지
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• 제24권3호
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• pp.264-278
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• 2010

본 연구는 독도의 식물상과 식생을 모니터링하여 독도생태계의 보존과 관리를 위한 기초자료를 제공하고자 수행하였다. 독도의 식물상은 29과 48속 49종 1아종 3변종 총 53종류로 기록되었다. 이 중 특산식물은 섬기린초와 섬초롱꽃 2종류이고, 귀화식물은 갓, 방가지똥, 큰이삭풀, 콩다닥냉이, 흰명아주, 둥근잎나팔꽃 등 6종류로 확인되었다. 특히, 둥근잎나팔꽃은 본 조사에서 처음으로 보고되었다. 식생형은 주로 해국-땅채송화, 해국-갯제비쑥, 왕호장근-도깨비쇠고비, 돌피, 물피군락 등으로 구분되었다. 독도에 분포하는 식물에 대한 오동정의 논란이 지속되고 있으며, 이를 위하여 분류군별 전문가의 조사가 필요하고, 고유식생을 유지하기 위하여 귀화식물 및 재배식물의 모니터링과 관리가 필요하다.