Names | |
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IUPAC name (2R,3R)-3,3′,4′,5,7-Pentahydroxyflavan-4-one | |
Systematic IUPAC name (2R,3R)-2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxy-2,3-dihydro-4H-1-benzopyran-4-one | |
Other names Dihydroquercetin Taxifoliol Distylin (+)-Taxifolin trans-Dihydroquercetin (+)-Dihydroquercetin | |
Identifiers | |
3D model (JSmol) | |
ChEBI | |
ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.006.859 |
EC Number |
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KEGG | |
PubChem CID | |
UNII | |
CompTox Dashboard (EPA) | |
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Properties | |
C15H12O7 | |
Molar mass | 304.254 g·mol−1 |
Appearance | Brown powder |
Melting point | 237 °C (459 °F; 510 K) [1] |
UV-vis (λmax) | 290, 327 nm (methanol) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Taxifolin (5,7,3',4'-flavan-on-ol), also known as dihydroquercetin, belongs to the subclass flavanonols in the flavonoids, which in turn is a class of polyphenols. It is extracted from plants such as Siberian larch and milk thistle. [2] [ unreliable source? ]
Taxifolin has two stereocenters on the C-ring, as opposed to quercetin which has none. [3] For example, (+)-taxifolin has (2R,3R)-configuration, making it one out of four stereoisomers that comprise two pairs of enantiomers. [4]
Taxifolin is found in non-glutinous rice boiled with adzuki bean (adzuki-meshi). [5]
It can be found in conifers like the Siberian larch, Larix sibirica, in Russia, in Pinus roxburghii , [6] in Cedrus deodara [6] and in the Chinese yew, Taxus chinensis var. mairei . [7]
It is also found in the silymarin extract from the milk thistle seeds.
Taxifolin is present in vinegars aged in cherry wood. [8]
Taxifolin, and flavonoids in general, can be found in many beverages and products. Specifically, taxifolin is found in plant-based foods like fruit, vegetables, wine, tea, and cocoa. [9]
Taxifolin is not mutagenic and less toxic than the related compound quercetin. [10] It acts as a potential chemopreventive agent by regulating genes via an ARE-dependent mechanism. [11] Taxifolin has shown to inhibit the ovarian cancer cell growth in a dose-dependent manner. [12] However, in this same study, taxifolin was the least effective flavonoid in the inhibition of VEGF expression. [13] There is also a strong correlation (with a correlation coefficient of 0.93) between the antiproliferative effects of taxifolin derivatives on murine skin fibroblasts and human breast cancer cells. [14]
Taxifolin has shown to have anti-proliferative effects on many types of cancer cells by inhibiting cancer cell lipogenesis. By inhibiting the fatty acid synthase in cancer cells, taxifolin is able to prevent the growth and spread of cancer cells. [15]
Taxifolin also stops the effects of overexpression of P-glycoprotein, which prevents the development of chemoresistance. Taxifolin does this via inhibition of rhodamine 123 and doxorubicin. [16]
The capacity of taxifolin to stimulate fibril formation and promote stabilization of fibrillar forms of collagen can be used in medicine. [17] Also taxifolin inhibited the cellular melanogenesis as effectively as arbutin, one of the most widely used hypopigmenting agents in cosmetics.
Taxifolin also enhances the efficacy of conventional antibiotics such as levofloxacin and ceftazidime in vitro , which have potential for combinatory therapy of patients infected with methicillin-resistant Staphylococcus aureus (MRSA). [18]
Like other flavonoids, taxifolin is able to function as an antifungal agent by blocking multiple pathways that promote the growth and proliferation of fungi. [19] [ unreliable medical source? ]
Taxifolin has also been found to reduce inhibitor of intestinal mobility especially when antagonized by verapamil. [19] [ unreliable medical source? ]
Taxifolin has also been shown to be anti-hyperlipidemic by maintaining the normal lipid profile of the liver and keeping lipid excretion at normal levels. Taxifolin prevents hyperlipidemia by reducing the esterification of cellular cholesterol, phospholipid, and triacylglycerol synthesis. [16]
Taxifolin, as well as many other flavonoids, has been found to act as a non-selective antagonist of the opioid receptors, albeit with somewhat weak affinity. [20] Taxifolin shows promising pharmacological activities in the management of inflammation, tumors, microbial infections, oxidative stress, cardiovascular, and liver disorders [21]
Taxifolin has been found to act as an agonist of the adiponectin receptor 2 (AdipoR2). [22]
The enzyme taxifolin 8-monooxygenase uses taxifolin, NADH, NADPH, H+, and O2 to produce 2,3-dihydrogossypetin, NAD+, NADP+, and H2O.
The enzyme leucocyanidin oxygenase uses leucocyanidin, alpha-ketoglutarate, and O2 to produce cis-dihydroquercetin, taxifolin, succinate, CO2, and H2O.
Astilbin is the 3-O-rhamnoside of taxifolin. Taxifolin deoxyhexose can be found in açai fruits. [23]
Taxifolin 3-O-glucoside isomers have been separated from Chamaecyparis obtusa . [24]
(-)-2,3-trans-Dihydroquercetin-3'-O-β-D-glucopyranoside, a taxifolin glucoside has been extracted from the inner bark of Pinus densiflora and can act as an oviposition stimulant in the cerambycid beetle Monochamus alternatus . [25]
(2S,3S)-(-)-Taxifolin-3-O-β-D-glucopyranoside has been isolated from the root-sprouts of Agrimonia pilosa . [26]
(2R,3R)-Taxifolin-3'-O-β-D-pyranoglucoside has been isolated from the rhizome of Smilax glabra . [27]
Minor amount of taxifolin 4′-O-β-glucopyranoiside can be found in red onions. [28]
(2R,3R)-Taxifolin 3-O-arabinoside and (2S,3S)-taxifolin 3-O-arabinoside have been isolated from the leaves of Trachelospermum jasminoides [29] (star jasmine).
Angiogenesis is the physiological process through which new blood vessels form from pre-existing vessels, formed in the earlier stage of vasculogenesis. Angiogenesis continues the growth of the vasculature mainly by processes of sprouting and splitting, but processes such as coalescent angiogenesis, vessel elongation and vessel cooption also play a role. Vasculogenesis is the embryonic formation of endothelial cells from mesoderm cell precursors, and from neovascularization, although discussions are not always precise. The first vessels in the developing embryo form through vasculogenesis, after which angiogenesis is responsible for most, if not all, blood vessel growth during development and in disease.
Catechin is a flavan-3-ol, a type of secondary metabolite providing antioxidant roles in plants. It belongs to the subgroup of polyphenols called flavonoids.
Quercetin is a plant flavonol from the flavonoid group of polyphenols. It is found in many fruits, vegetables, leaves, seeds, and grains; capers, red onions, and kale are common foods containing appreciable amounts of it. It has a bitter flavor and is used as an ingredient in dietary supplements, beverages, and foods.
An angiogenesis inhibitor is a substance that inhibits the growth of new blood vessels (angiogenesis). Some angiogenesis inhibitors are endogenous and a normal part of the body's control and others are obtained exogenously through pharmaceutical drugs or diet.
Rutin is the glycoside combining the flavonol quercetin and the disaccharide rutinose. It is a flavonoid glycoside found in a wide variety of plants, including citrus.
Genistein (C15H10O5) is a naturally occurring compound that structurally belongs to a class of compounds known as isoflavones. It is described as an angiogenesis inhibitor and a phytoestrogen.
Phellodendron amurense is a species of tree in the family Rutaceae, commonly called the Amur cork tree. It is a major source of huáng bò, one of the 50 fundamental herbs used in traditional Chinese medicine. The Ainu people used this plant, called shikerebe-ni, as a painkiller. It is known as hwangbyeok in Korean and (キハダ) kihada in Japanese.
Mothers against decapentaplegic homolog 7 or SMAD7 is a protein that in humans is encoded by the SMAD7 gene.
α-Glucosidase (EC 3.2.1.20, is a glucosidase located in the brush border of the small intestine that acts upon α bonds:
Lysyl oxidase (LOX), also known as protein-lysine 6-oxidase, is an enzyme that, in humans, is encoded by the LOX gene. It catalyzes the conversion of lysine residues into its aldehyde derivative allysine. Allysine form cross-links in extracellular matrix proteins. Inhibition of lysyl oxidase can cause osteolathyrism, but, at the same time, its upregulation by tumor cells may promote metastasis of the existing tumor, causing it to become malignant and cancerous.
72 kDa type IV collagenase also known as matrix metalloproteinase-2 (MMP-2) and gelatinase A is an enzyme that in humans is encoded by the MMP2 gene. The MMP2 gene is located on chromosome 16 at position 12.2.
In enzymology, a leucocyanidin oxygenase (EC 1.14.11.19) is an enzyme that catalyzes the chemical reaction
Pigment epithelium-derived factor (PEDF) also known as serpin F1 (SERPINF1), is a multifunctional secreted protein that has anti-angiogenic, anti-tumorigenic, and neurotrophic functions. Found in vertebrates, this 50 kDa protein is being researched as a therapeutic candidate for treatment of such conditions as choroidal neovascularization, heart disease, and cancer. In humans, pigment epithelium-derived factor is encoded by the SERPINF1 gene.
Vascular endothelial growth factor B also known as VEGF-B is a protein that, in humans, is encoded by the VEGF-B gene. VEGF-B is a growth factor that belongs to the vascular endothelial growth factor family, of which VEGF-A is the best-known member.
Fisetin (7,3′,4′-flavon-3-ol) is a plant flavonol from the flavonoid group of polyphenols. It can be found in many plants, where it serves as a yellow/ochre colouring agent. It is also found in many fruits and vegetables, such as strawberries, apples, persimmons, onions and cucumbers. Its chemical formula was first described by Austrian chemist Josef Herzig in 1891.
Isorhamnetin is an O-methylated flavon-ol from the class of flavonoids. A common food source of this 3'-methoxylated derivative of quercetin and its glucoside conjugates are pungent yellow or red onions, in which it is a minor pigment, quercetin-3,4'-diglucoside and quercetin-4'-glucoside and the aglycone quercetin being the major pigments. Pears, olive oil, wine and tomato sauce are rich in isorhamnetin. Almond skin is a rich source of isorhamnetin-3-O-rutinoside and isorhamnetin-3-O-glucoside, in some cultivars they comprise 75% of the polyphenol content, the total of which can exceed 10 mg/100 gram almond. Others sources include the spice, herbal medicinal and psychoactive Mexican tarragon (Tagetes lucida), which is described as accumulating isorhamnetin and its 7-O-glucoside derivate. Nopal is also a good source of isorhamnetin, which can be extracted by supercritical fluid extraction assisted by enzymes.
The flavanonols are a class of flavonoids that use the 3-hydroxy-2,3-dihydro-2-phenylchromen-4-one backbone.
Aromadendrin is a flavanonol, a type of flavonoid. It can be found in the wood of Pinus sibirica.
The O-methylated flavonoids or methoxyflavonoids are flavonoids with methylations on hydroxyl groups. O-methylation has an effect on the solubility of flavonoids.
Syringetin is an O-methylated flavonol, a type of flavonoid. It is found in red grape, in Lysimachia congestiflora and in Vaccinium uliginosum. It is one of the phenolic compounds present in wine.