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A common flavonol pigment that occurs naturally in many plants, especially in Oak bark, Tea leaves, Onion skins, Douglas fir bark, clover blossoms, and ragweed pollen. Quercetin is yellow crystalline powder that is used medicinally and as a textile dye or colorant. It produces a bright yellow with alum and tin, a tan with chrome, and an olive green with iron.

Synonyms and Related Terms

Natural Yellow 10; CI 75670; 3.3',4',5,7-pentahydroxyflavone; quercitina (Esp.); quercetina (Port.); meletin; sophoretin; cyanidenolon 1522; ; 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4H-I-benzopyran-4-one


Quercetin Dihydrate.TIF


  • Contact may cause irritation.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

  • Soluble in ethanol, acetic acid and dilute alkali. Insoluble in water.
  • UV max (in ethanol) 258 and 375 nm.
  • Crystallizes as yellow needles from alcohol.
Composition C5H15O2(OH)5
CAS 117-39-5
Melting Point 315 C (dec)
Molecular Weight mol. wt. = 302.23

Resources and Citations

  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 8216
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Dictionary of Art, Grove's Dictionaries Inc., New York, 1996 Comment: 'Pigment'
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 557
  • John and Margaret Cannon, Dye Plants and Dyeing, Herbert Press, London, 1994
  • F. Crace-Calvert, Dyeing and Calico Printing, Palmer & Howe, London, 1876
  • Judith Hofenk-de Graaff, Natural Dyestuffs: Origin, Chemical Constitution, Identification, Central Research Laboratory for Objects of Art and Science, Amsterdam, 1969