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A yellow flavonol, C15H10O7, found in glycoside form in tea and in many vegetables and fruits. It is an antioxidant and is used as a dietary supplement for its supposed antihistaminic, anti-inflammatory, and antitumor properties.

[Latin quercētum, oak forest (from quercus, oak; see perkwu- in Indo-European roots) + -in.]


(ˈkwɜːsɪtɪn) or


(Elements & Compounds) a yellow crystalline pigment found naturally in the rind and bark of many plants. It is used in medicine to treat fragile capillaries. Formula: C15H10O7; melting pt: 316–7°C. Also called: flavin
[C19: from Latin quercētum an oak forest (from quercus an oak) + -in]
quercetic adj
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References in periodicals archive ?
In addition to the chlorothalonil, the bees were attracted to a natural chemical called quercetin that is found in a lot of their food sources and has health benefits.
This study was performed to examine and assess the beneficial effects of melatonin and quercetin on depressive disorders and the disturbance of lipid metabolism caused by diabetes mellitus.
Quercetin is a flavonoid antioxidant found in fruits, vegetables and grains, and is the most abundant flavonol in the human diet (Burda & Oleszek, 2001).
Testing was arranged for transforming growth factor-beta (TGF-beta) and prescription given for metformin-ER, 500 mg twice daily, and quercetin, 1000 mg twice daily.
Capers, red onions, and watercress, for instance, contain high amounts of the natural antihistamine quercetin.
In the first study of its kind, researchers placed colon cancer cells in contact with quercetin.
They contain one of the highest concentrations of quercetin, a type of flavonoid, they said.
The researchers prepared pomegranate juice samples by adding phenolics (gallic acid, catechin and quercetin, individually and in combinations), or sugars (sucrose and trehalose), or a combination of phenolics and sugars.
A recent report in the Journal of the American College of Nutrition found a remarkable benefit for supplementing with quercetin in a randomized, double-blind trial of women with rheumatoid arthritis.
1 THIS vegetable contains lots of calcium but it also offers a great selection of antioxidants, including a particularly powerful one called sulforaphane, as well as vitamin C, quercetin, glutathione and lutein.
4 CAPERS are a good source of quercetin, an antioxidant that has anti-bacterial, anticarcinogenic, analgesic and anti-inflammatory properties.