• 제목/요약/키워드: Quercetin, Quercetin glycosides

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Stepwise Synthesis of Quercetin Bisglycosides Using Engineered Escherichia coli

  • Choi, Gyu Sik;Kim, Hyeon Jeong;Kim, Eun Ji;Lee, Su Jin;Lee, Youngshim;Ahn, Joong-Hoon
    • Journal of Microbiology and Biotechnology
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    • 제28권11호
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    • pp.1859-1864
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    • 2018
  • Synthesis of flavonoid glycoside is difficult due to diverse hydroxy groups in flavonoids and sugars. As such, enzymatic synthesis or biotransformation is an approach to solve this problem. In this report, we used stepwise biotransformation to synthesize two quercetin bisglycosides (quercetin 3-O-glucuronic acid 7-O-rhamnoside [Q-GR] and quercetin 3-O-arabinose 7-O-rhamnoside [Q-AR]) because quercetin O-rhamnosides contain antiviral activity. Two sequential enzymatic reactions were required to synthesize these flavonoid glycosides. We first synthesized quercetin 3-O-glucuronic acid [Q-G], and quercetin 3-O-arabinose [Q-A] from quercetin using E. coli harboring specific uridine diphopsphate glycosyltransferase (UGT) and genes for UDP-glucuronic acid and UDP-arabinose, respectively. With each quercetin 3-O-glycoside, rhamnosylation using E. coli harboring UGT and the gene for UDP-rhamnose was conducted. This approach resulted in the production of 44.8 mg/l Q-GR and 45.1 mg/l Q-AR. This stepwise synthesis could be applicable to synthesize various natural product derivatives in case that the final yield of product was low due to the multistep reaction in one cell or when sequential synthesis is necessary in order to reduce the synthesis of byproducts.

Further Flavonol Glycosides from Myrsine africana Leaves

  • Arot, Lawrence O. Manguro;Midiwo, Jacob Ogweno;Kraus, Wolfgang
    • Natural Product Sciences
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    • 제3권1호
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    • pp.8-10
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    • 1997
  • A new flavonol glycoside, quercetin 3-rhamnosyl $(1{\rightarrow}3)$ galactoside [5] was isolated from the leaves of M. africana. The known compounds kaempferol 3-rutinoside [1], 3'-O-methylquercetin 3-rutinoside [2], quercetin 3-rutinoside [3], and quercetin 3-rhamnosyl $(1{\rightarrow}6)$ galactoside [4] were also isolated for the first time from this plant. Their structures were determined by chemical and spectroscopic methods.

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Effect of Fungal Elicitor and Heavy Metals on the Production of Flavonol Glycosides in Cell Cultures of Ginkgo biloba

  • KIM, MIN SOO;CHUL KIM;DO HYUN JO;YEON WOO RYU
    • Journal of Microbiology and Biotechnology
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    • 제9권5호
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    • pp.661-667
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    • 1999
  • The effect of fungal elicitor and heavy metal salts on the production of flavonol glycosides in cell cultures of Ginkgo biloba was investigated. Among the fungi tested, Trichoderma longibrachiatum ATCC 52326 was found to be the most efficient in the production of flavonol glycosides. Kaempferol production from the elicited callus increased ten-fold as compared to the unelicited callus, while quercetin concentration of elicited cells was nine-fold higher than that of uneliceited cells in suspension cultures. The maximum quercetin concentration of 0.362㎎/l was obtained in 1.25㎎/l of the homogenate elicitor. Among the heavy metal salts tested, CuSO₄ showed a significant effect on quercetin accumulation, reaching to the concentration of 0.526 ㎎/l. Quercetin concentration increased to a maximum of l2-fold in response to CuSO₄ treatment as compared to that of untreated cells. The phenylalanine ammonia-lyase (PAL) activity and flavonol glycosides production simultaneously increased for 5 days of culture after fungal elicitor feeding, and their contents showed the same proportional patterns during the culture period. In contrast, PAL activity of cell cultures treated with CuSO₄ was almost constant during the culture period, although quercetin production increased remarkably.

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양파의 Quercetin 관련 물질의 분리 기술 개발 1. 양파의 Quercetin 관련 물질의 함량과 안정성 (Development of Separating Techniques on Quercetin-Related Substances in Onion(Allium cepa L.) 1. Contents and Stability of Quercetin-Related Substances in Onion)

  • 강성구;김용두;현규환;김영환;송보현;신수철;박양균
    • 한국식품영양과학회지
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    • 제27권4호
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    • pp.682-686
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    • 1998
  • To use onion(Allium cepa L.) residue as raw materials of food products, contents and stability of quercetin-related substance in onion were investigated. The amount of quercetin-related substance of onion was richer in the inedible portion(317.99mg%) than the edible protion(4.10mg%). Total quercetin-related substances of juice and residue from fresh onions were 2.26mg% and 1.57mg%, respectively, but they were changed to 1.50mg% and 2.96mg% by heating at 8$0^{\circ}C$ for 10min. Quercetin was found to be stable at 20$0^{\circ}C$ for 60 min, but it was unstable to light. When it was illuminated with 30W, the content was decreased and reached to 80~85% of the original content after 48 hours. Quercetin was not affected by pH, but quercitrin and rutin were unstable below pH 5.

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담쟁이덩굴엽의 플라보놀 배당체 (Flavonol Glycosides from Parthenocissus tricuspidata Leaves)

  • 황현경;성환길;황완균;김일혁
    • 약학회지
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    • 제39권3호
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    • pp.289-296
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    • 1995
  • For the investigation of medicinal resources the studies were carried out to evaluated the pharmaco-constituents in the Leaves of Parthenocissus tricuspidata(Vitaceae), of which leaves have been used in Korea as folk remedies for the treatments of arthritis, jaundice, toothache, neuralgia, and etc. From 1-butanol fraction of the MeOH extract, Compound I ($C_{21}H_{18}O_{13}$, Quercetin-3-O-$\beta$-D-glucuronopyranoside), Compound II ($C_{21}H_{20}O_{12}$, Quercetin-3-O-$\beta$-D-glucopyranoside) and Compound III ($C_{25}H_{28}O_{12}$, Quercetin-3-O-(6"-n-butyl)-$\beta$-D-glucuronopyranoside) were isolated by column chromatographic separation using Sephadex LH-20 and ODS gel. Their structures were elucidated through instrumental analyses, such as $^{1}H$-NMR, $^{13}C$-NMR, IR, UV, El-Mass, FAB-Mass and GC. Especially compound III was Flavonol glycoside and named parthenosin.

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Effect of Environmental Factors on Flavonol Glycoside Production and Phenylalanine Ammonia-lyase Activity in Cell Suspension Cultures of Ginkgo biloba

  • Kim, Min-Soo;Lee, Won-Kyu;Kim, Hwa-Young;Kim, Chul;Ryu, Yeon-Woo
    • Journal of Microbiology and Biotechnology
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    • 제8권3호
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    • pp.237-244
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    • 1998
  • A study was carried out to elucidate the relation between the production of flavonol glycosides and the change of phenylalanine ammonia-lyase activity in cell suspension cultures of Ginkgo biloba by the unassisted and synergistic effects of various factors. The quercetin production showed a mixed-growth-associated pattern in cell suspension cultures. Fluorescent light and UV radiation increased phenylalanine ammonia-lyase (PAL) activity, and resulted in the increase of the production of quercetin and kaempferol ten- and four-fold, respectively, as compared to that obtained in the normal culture condition. The cell growth of Ginkgo biloba was enhanced .at higher temperatures whereas the quercetin production was at its maximum at low temperatures. Moreover, the quercetin production was increased by temperature change during the culture period. In particular, the quercetin production was at the highest level when the culture temperature was elevated from $10^{\circ}C\;to\;30^{\circ}C$. The addition of phenylalanine as a precursor in the culture medium stimulated an 8-fold increase in the production of quercetin; the addition of naringenin caused a l0-fold increase. The quercetin production was also greatly increased by feeding enzyme cofactors such as 2-ketoglutarate and ascorbic acid in the culture medium, but specific PAL activity was not increased except with phenylalanine feeding. The synergistic effect of UV radiation and naringenin feeding was observed, resulting in the increase of flavonol glycoside production at a rate higher than in any other case investigated.

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양파(Allium cepa L.) 유전자원의 Flavonol 배당체 조성 및 함량 (The Compositions and Contents of Flavonol Glycosides in Onion (Allium cepa L.) Germplasm)

  • 이정로;이민기;김헌웅;이성현;이영민;장환희;황경아;곽재균;고호철;김정봉;조진웅
    • 한국작물학회지
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    • 제59권3호
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    • pp.385-389
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    • 2014
  • 국내외 75점의 흰색 및 자색 양파 유전자원으로부터 총 5종의 flavonol 배당체(Q34'diG, Q3G, Q4'G, I4'G, Q)를 분리 동정하였다. 양파 내 존재하는 flavonol 배당체는 aglycone인 quercetin 및 isorhamnetin에 하나 또는 두 개의 glucose가 결합된 형태로 검출되었다. 총 flavonol 함량 범위는 흰색 양파가 0.18-6.47 mg/g, 자색 양파가 2.39-6.47 mg/g 이었으며, 자색 양파가 평균 4.41 mg/g 로 흰색 양파(3.23 mg/g)보다 약 1.4배 높았다. 양파의 주요 성분으로는 Q34'diG 및 Q4'G 총함량 비율이 흰색 및 자색 양파에서 모두 약 85% 이상을 보였다.

Effect of Four Flavonoids on Blood Glucose of Rats

  • Ammar, Nagwa M.;Al-Okbi, Sahar Y.
    • Archives of Pharmacal Research
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    • 제11권2호
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    • pp.166-168
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    • 1988
  • The effects of aglycones moring and quercetin and their corresponding glycosides quercitrin and rutin were studied on the blood glucose levels of rats. Quercetin and quercetrin caused hypoglycaemia in rats while rutin and morin showed almost no difference. Quercetin, which showed 50% pronounced hypoglycaemic effects, reduced significantly the blood glucose level of alloxan diabetic rats.

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Flavonoids with anticomplement activity from Persicaria lapathifolia

  • Park, Si-Hyung;Oh, Sei-Ryang;Kim, Young-Soo;Lee, Hyeong-Kyu
    • 한국응용약물학회:학술대회논문집
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    • 한국응용약물학회 1998년도 Proceedings of UNESCO-internetwork Cooperative Regional Seminar and Workshop on Bioassay Guided Isolation of Bioactive Substances from Natural Products and Microbial Products
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    • pp.186-186
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    • 1998
  • Persicaria lapathifolia Gray (Polygonaceae) is a common weed in Korea. This plant and other Persicaria species including P. orientale and P. pubescens have been used as an analgesic and stomachic as well as for the treatment of rheumatoid arthritis and malaria. During the screening program of plant extracts, MeOH extract of P. scabrum showed anticomplement activity and the MeOH extract was partitioned with hexane, chloroform, ethyl acetate, and buthanol. EtOAc fraction showed strong activity and activity guided separation yielded eight flavonoids. Two known galloylated and a novel ferulloylated flavonoid glycosides showed strong anticomplement activity. Other flavonoid glycosides, kaempferol 3-O-${\alpha}$-$\sub$L/-arabinopyranoside, kaempferol 3-O-${\beta}$-$\sub$D/-glucopyranoside, kaempferol 3-O-${\beta}$-$\sub$D/-galactopyranoside, quercetin 3-O-${\alpha}$-$\sub$L/-arabinopyranoside, quercetin 3-O-${\beta}$-$\sub$D/-glucopyranoside, quercetin O-${\beta}$-$\sub$D/-galactopyranoside did not showed anicomplement activity.

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