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Flavonoids and polyphenols

Quercetin

Also known as Sophoretin, Meletin, Xanthaurine

CAS 117-39-5Formula C15H10O7Molar mass 302.24 g/molEC 204-187-1
GHS signal word: Danger. Pictograms: Acute toxicity (severe) 158 suppliers listed Drug substance
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Quercetin chemical structure, C15H10O7, CAS 117-39-5
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Yellow needles (dilute alcohol, +2 water)
Melting point
316.5 °C
Boiling point
Sublimes
Solubility
Soluble in alcohol and glacial acetic acid, insoluble in water
HS code
293299
Category
Flavonoids and polyphenols
UN number
UN 2811
Illustrative photo, yellow pigment powder in an open kraft paper sack in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Quercetin?

Plain description, key identifiers and synonyms

Quercetin is a pentahydroxyflavone having the five hydroxy groups placed at the 3-, 3'-, 4'-, 5- and 7-positions. It is one of the most abundant flavonoids in edible vegetables, fruit and wine. It has a role as a geroprotector, an antioxidant, an antibacterial agent, an antineoplastic agent, a protein kinase inhibitor, a chelator, a radical scavenger, an Aurora kinase inhibitor, a plant metabolite, a phytoestrogen and an EC 1.10.99.2 [ribosyldihydronicotinamide dehydrogenase (quinone)] inhibitor. It is a pentahydroxyflavone and a 7-hydroxyflavonol. It is a conjugate acid of a quercetin-7-olate.

Quercetin is a polyphenol of the family of flavonoids.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxychromen-4-one
CAS number
117-39-5 CAS number cross-checkedOther or deprecated CAS: 6151-25-3, 74893-81-5
EC number
204-187-1
Molecular formula
C15H10O7
UNII
9IKM0I5T1E
MDL number
MFCD00006828
INCI name
QUERCETIN
InChIKey
REFJWTPEDVJJIY-UHFFFAOYSA-N
InChI
InChI=1S/C15H10O7/c16-7-4-10(19)12-11(5-7)22-15(14(21)13(12)20)6-1-2-8(17)9(18)3-6/h1-5,16-19,21H
SMILES (canonical and isomeric)
C1=CC(=C(C=C1C2=C(C(=O)C3=C(C=C(C=C3O2)O)O)O)O)O

Synonyms

  • Sophoretin
  • Meletin
  • Xanthaurine
  • Quercetol
  • Quercetine
  • Quertine
  • 2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxy-4H-chromen-4-one
  • Quercitin
  • 3,3',4',5,7-Pentahydroxyflavone
  • Quertin
  • 3,5,7,3',4'-Pentahydroxyflavone
  • Cyanidelonon 1522
  • Flavin meletin
  • T-Gelb bzw. grun 1
  • C.I. Natural Yellow 10
  • Cyanidenolon 1522
  • 2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxy-4H-1-benzopyran-4-one
  • C.I. 75670
  • C.I. Natural red 1
  • Corvitin
  • 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxychromen-4-one
  • Korvitin
  • Lipoflavon
  • 3',4',5,7-Tetrahydroxyflavan-3-ol
  • Flavone, 3,3',4',5,7-pentahydroxy-
Show all 37 synonyms
  • 4H-1-Benzopyran-4-one, 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-
  • 3'-hydroxykaempferol
  • 3,5,7-Trihydroxy-2-(3,4-dihydroxyphenyl)-4H-chromen-4-on
  • CI 75670
  • Flavone, 3,4',5,5',7-pentahydroxy-
  • Quercetin (constituent of ginkgo)
  • Dikvertin
  • Quercetin,
  • Quercetin Phenolic
  • flavan-3,4-diols
  • Quercetin 1540
  • Quercetin content

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Yellow needles (dilute alcohol, +2 water)exp.
Melting point
316.5 °Cexp.
Boiling point
Sublimesexp.
Solubility
Soluble in alcohol and glacial acetic acid, insoluble in waterexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
302.24 g/molcalc.
Exact mass
302.0427 Dacalc.
LogP (octanol/water)
1.99calc.
Topological polar surface area
131.4 Ųcalc.
Hydrogen bond donors
5calc.
Hydrogen bond acceptors
7calc.
Rotatable bonds
1calc.
Heavy atoms
22calc.
Rings
3calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=c1cc(-c2ccccc2)oc2ccccc12

O=c1cc(-c2ccccc2)oc2ccccc12

3 rings, 17 atoms, the Flavone ring system.

2,273 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)

Hazard statements

  • H301Toxic if swallowed.
Precautionary statements (7)
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2811

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Quercetin suppliers

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All 158 suppliers
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Where suppliers are based

158 suppliers in 26 countries

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Quercetin price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Dietary supplement.

Quercetin has been used in ... dyes and as a veterinary drug.

Medicine, reported formation of epoxy resins on mixing with epichlorohydrin.

Free-radical inhibiting antioxidant useful in cosmetics intended to protect the product from oxidative damage from UV radiation or singlet oxygen formation ... Use levels are normally about 0.1% and rarely exceed 0.2%.

Cosmetic ingredient, INCI name QUERCETIN(antioxidant, skin conditioning - miscellaneous)

Pharmacological actions

  • Antioxidants

Roles

  • Aurora kinase inhibitor
  • agonist
  • anti-anaemic agent
  • anti-inflammatory agent
  • anti-obesity agent
  • antibacterial agent
  • antifibrotic agent
  • antimicrobial agent
  • antineoplastic agent
  • antioxidant
  • antiviral agent
  • cardiovascular drug
  • chelator
  • geroprotector
  • hypoglycemic agent
  • ligand
  • molecular messenger
  • ophthalmology drug
  • pharmaceutical
  • phytoestrogen
  • plant metabolite
  • protective agent
  • protein kinase inhibitor
  • radical scavenger

Functional uses

  • Antioxidant
  • Softener and conditioner

Cosmetic functions

  • Antioxidant
  • Skin conditioning - miscellaneous

Pharmacology

Quercetin is a polyphenolic flavonoid with potential chemopreventive activity. Quercetin, ubiquitous in plant food sources and a major bioflavonoid in the human diet, may produce antiproliferative effects resulting from the modulation of either EGFR or estrogen-receptor mediated signal transduction pathways. Although the mechanism of action of action is not fully known, the following effects have been described with this agent in vitro: decreased expression of mutant p53 protein and p21-ras oncogene, induction of cell cycle arrest at the G1 phase and inhibition of heat shock protein synthesis.

Read more

This compound also demonstrates synergy and reversal of the multidrug resistance phenotype, when combined with chemotherapeutic drugs, in vitro. Quercetin also produces anti-inflammatory and anti-allergy effects mediated through the inhibition of the lipoxygenase and cyclooxygenase pathways, thereby preventing the production of pro-inflammatory mediators.

How it is made

Quercetin ... has been obtained for use as a natural coloring agent (Natural Yellow 10) by the rapid extraction of powdered quercitron bark with dilute ammonia and boiling of the extract with sulphuric acid ... The first successful synthesis of quercetin was reported in 1962 ... in which treatment of 2-methoxyacetyl phloroglucinol with O-benzylvanillic acid anhydride in triethylamine and then with potassium hydroxide produced 5,7-dihydroxy-4'-benzyloxy-3,3'- dimethexyflavone. The benzyl ether was cleaved with acetic acid-hydrochloric acid, and the methyl ethers were then cleaved with hydriodic acid to produce quercetin.

Isolation from Rhododendron cinnabarinum Hook, Ericaceae

/Isolation from/ bark of fir trees, also synthetically

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • Active ingredient in FDA approved drug labels

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Quercetin is traded under.

HS 2932.99Indicative HS code

Heterocyclic compounds with oxygen hetero-atom(s) only, other

World exports in 2024
$3.81B
+10.3% vs 2023, imports $7.05B
2019 to 2024
Top exporters
  1. China28.9%
  2. Switzerland * partner reported12.7%
  3. Germany7.8%
Top importers
  1. United States49.7%
  2. China11.9%
  3. India * partner reported3.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Quercetin is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Quercetin, based on the data on this page

What is Quercetin?

Quercetin is a pentahydroxyflavone having the five hydroxy groups placed at the 3-, 3'-, 4'-, 5- and 7-positions. It is one of the most abundant flavonoids in edible vegetables, fruit and wine.

What is the CAS number of Quercetin?

The CAS registry number of Quercetin is 117-39-5. Other or deprecated CAS numbers: 6151-25-3, 74893-81-5.

What is the molecular formula and weight of Quercetin?

The molecular formula of Quercetin is C15H10O7 and its molar mass is 302.24 g/mol.

What is Quercetin used for?

Dietary supplement. Quercetin has been used in ... dyes and as a veterinary drug. Medicine, reported formation of epoxy resins on mixing with epichlorohydrin. Free-radical inhibiting antioxidant useful in cosmetics intended to protect the product from oxidative damage from UV radiation or singlet oxygen formation ...

Is Quercetin hazardous?

Quercetin carries the GHS signal word "Danger". Main hazards: toxic if swallowed. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Quercetin?

Quercetin is usually classified under HS code 293299 (Heterocyclic compounds with oxygen hetero-atom(s) only, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Quercetin?

CompoundList lists 158 suppliers of Quercetin in China, United States, United Kingdom, Spain and 22 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Quercetin in India?

5 suppliers in India list Quercetin on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Quercetin?

Suppliers quote Quercetin on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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