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  • Quercetin is the most abundant of the flavonoids. Quercetin belongs to the flavonoids family and consist of 3 rings and 5 hydroxyl groups.
  • Quercetin, a member of the flavonoids family, exerts many beneficial health effects, including improvement of cardiovascular health, reducing risk for cancer, protection against osteoporosis.
  • Quercetin is a polyphenolic bioflavonoid or flavonoid, more specifically classified as a flavonol.
  • Quercetin, a flavonol, is a plant-derived flavonoid found in fruits, vegetables, leaves and grains. It also may be used as an ingredient in supplements, beverages or foods.
  • Quercetin belongs to a class of water-soluble plant pigments called bioflavonoids that cannot be produced in the human body. It is also considered a phytoestrogen.
  • This flavonoid has shown several pharmacological activities including antioxidant, anti-inflammatory, anticancer, and antiviral properties. In spite of a variety of its biological effects, quercetin is very poorly soluble in water, which has limited its absorption upon oral administration.
  • Quercetin glycosides in the onion extracts were converted to quercetin and sugars by different types of recombinantly expressed thermostable Beta-glucosidases.
  • Quercetin is a polyphenolic compounds that occurs in vegetables and fruits mainly as different glycosides, although the skin of the fruit/vegetable commonly contains higher amounts of the quercetin aglycone. The most environmentally friendly solvent that could be used for extraction of quercetin is water. However, since pure water at ambient condition is
    too polar to be a good solvent for quercetin, we instead use water at elevated temperatures as a solvent, i.e. subcritical water.
  • Quercetin is one of the most abundant dietary flavonoids. It is found in apples; black, green and buckwheat tea; onions (particularly the outer rings); raspberries; red wine; red grapes; cherries; citrus fruits; broccoli and other green leafy vegetables.
  • Quercetin is typically found in plants as glycone or carbohydrate conjugates. Quercetin glycone conjugates include rutin and thujin. Rutin is also known as Quercetin-3-rutinoside.Thujin is also known as quercitrin, Quercetin-3-L-rhamnoside and 3-rhannosyl qurcetin.

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