• Title/Summary/Keyword: $quercetin-3-O-{\beta}-D-xylopyranosyl(l{\rightarrow}2)-{\beta}-D-glucopyranoside$

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Phenolic Components from the Fruits of Pourthiaea villosa (윤노리나무 과실의 페놀성 성분)

  • Lee, Hyun Jin;Ahn, Dalrae;Lee, Eun Byeol;Lee, Tae Gwan;Kim, Dae Keun
    • Korean Journal of Pharmacognosy
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    • v.44 no.1
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    • pp.16-21
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    • 2013
  • The fruits of Pourthiaea villosa were extracted with methanol and its extract was fractionated with n-hexane, methylene chloride, ethyl acetate and n-butanol. Repeated column chromatography of silica gel, sephadex LH-20 and HPLC led to the isolation of nine phenolic compounds from ethyl acetate soluble fraction. The chemical structures were elucidated as kaemferol-3-O-${\beta}$-D-glucopyranoside (astragalin) (1), isorhamnetin-3-O-${\beta}$-D-glucopyranoside (2), kaempferol-3-O-${\beta}$-D-xylopyranosyl($1{\rightarrow}2$)-${\alpha}$-L-rhamnopyranoside (3), caffeic acid (4), quercetin-3-O-${\beta}$-D-xylopyranosyl($1{\rightarrow}2$)-a-L-rhamnopyranoside (5), quercetin-3-O-${\beta}$-D-xylopyranosyl($1{\rightarrow}2$)-${\beta}$-D-glucopyranoside (6), quercetin-3-O-${\beta}$-D-xylopyranosyl($1{\rightarrow}2$)-${\beta}$-D-galactopyranoside (7), quercetin-3-O-${\alpha}$-L-rhamnopyranoside (quercitrin) (8), and kaempferol-3-O-${\alpha}$-L-rhamnopyranoside (afzelin) (9) by spectroscopic techniques. These compounds were isolated from this plant for the first time.

Standardization and Seasonal Variation of Quercetin Glycoside in Eucommiae Folium (두충엽 함유 퀘르세틴배당체의 함량 표준화 및 계절적 변화)

  • Ham, In-Hye;Lee, Seung-Jae;Kim, Ho-Hyun;Kang, In-Ho;Jin, Hee-Ouk;Whang, Wan-Kyunn
    • Korean Journal of Pharmacognosy
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    • v.33 no.3 s.130
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    • pp.194-199
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    • 2002
  • The radix and folium of Eucommia ulmoides(Eucommiaceae) has been used for backache, atrophy of the leg and knee, enuresis, hypertension. In order to evaluate to quality of folium, we have been isolated a main compound as a standard compound, which was elucidated $quercetin-3-O-{\beta}-D-xylopyranosyl(l{\rightarrow}2)-{\beta}-D-glucopyranoside$ through it's physicochemical data and IR, FAB-Mass, $^{13}C-NMR$ and $^{1}H-NMR$ analysis. It was analyzed by HPLC system using 17% $CH_3CN$ as a solvent system. The amount of $quercetin-3-O-{\beta}-D-xylopyranosyl(l{\rightarrow}2)-{\beta}-D-glucopyranoside$ from Eucommiae folium was in the range of $0.056{\pm}0.022$ mg(n=7) and also from the results of analysis through seasonal variation$(June{\sim}October)$ September and October have been evaluated to be very high in it's content.

Phenolic Compounds from Seeds of Astragalus sinicus and Its Antioxidative Activities (자운영(Astragalus sinicus)종자의 페놀성 화합물 및 항산화 활성)

  • Yeom, Seung-Hwan;Kim, Min-Kee;Kim, Hyun-Jung;Shim, Jae-Geul;Lee, Jae-Hee;Lee, Min-Won
    • Korean Journal of Pharmacognosy
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    • v.34 no.4 s.135
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    • pp.344-351
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    • 2003
  • Phytochemical examination of seeds of Astragalus sinicus has led to the isolation and characterization of kaempferol $3-O-{\beta}-D-apiofuranosyl-(1{\rightarrow}2)-{\alpha}-L-rhamnopyranosyl-(1{\rightarrow}6)-{\beta}-D-glucopyranoside$ (1), quercetin $3-O-{\beta}-D-xylopyranosyl-(1{\rightarrow}2)-{\beta}-D-glucopyranoside$ (2), ampelopsin (3), ampelopsin $3'-O-{\beta}-D-xylopyranoside$ (4), ampelopsin $3'-O-{\beta}-Dxylopyranoside$ (5), myricetin (6), myricetin $3'-O-{\beta}-D-glucopyranoside$ (7), myricetin $3'-O-{\beta}-D-xylopyranoside$ (8). Antioxidative activity of these compounds was determined by measuring the radical scavenging effect on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals. Flavanonols(3,4, and 5) showed potent antioxidative activity.

Flavonoids from the Leaves of Rubus Coreanum (복분자 딸기 잎의 플라보노이드)

  • Kim, Min-Son;Pang, Geun-Cheol;Lee, Min-Won
    • YAKHAK HOEJI
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    • v.41 no.1
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    • pp.1-6
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    • 1997
  • Rubus coreantim (Rosaceae), which has been used in oriental traditional medicine as the remedies for impotence, pollution and premature ejaculation, bet-wetting and frequ ency of urination. is a fruit drug cultivating throughout southern Korea. The leaves of Rubus coreanum were extracted with 80% acetone. The extracts were separated by Ambellite XAD-2, Sephadex LH-20. MCI-gel CHP 20P and Cosmosil 75 C$_{18}$ OPN. And three flavonoids were isolated. The structures of these compounds were elucidated as quercetin-3-O-${\beta}$-D-glueuronopyranoside(l). quercetin-3-O-${\beta}$-D-glueuronopyranosyl methyl ester(2), quercetin-3-O-${\beta}$-D-xylopyranosyl-(2${\rightarrow}$1)-${\beta}$-glucopyranoside(3) on the basis of physicochemical and spectroscopic evidences.

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