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Proanthocyanidins are a class of polyphenols found in many plants, such as cranberry, blueberry, and grape seeds. Chemically, they are oligomeric flavonoids. Many are oligomers of catechin and epicatechin and their gallic acid esters. More complex polyphenols, having the same polymeric building block, form the group of condensed tannins.
Caftaric acid is a non-flavonoid phenolic compound.. It is found in the juice of grapes [1] [2] (Vitis vinifera) and impacts the color of white wine.. It is an esterified phenolic acid, composed of caffeic acid, a hydroxycinnamate produced by plants, and tartaric acid, the principal organic acid found in grape berries.
Flavonoids, a subset of polyphenol antioxidants, are present in many berries, as well as in coffee and tea. Examples: Myricetin - walnuts are a rich source; Isoflavone phytoestrogens - found primarily in soy, peanuts, and other members of the family Fabaceae; Resveratrol - found in the skins of dark-colored grapes, and concentrated in red wine.
Procyanidin content in dietary supplements has not been well documented. [26] Pycnogenol is a dietary supplement derived from extracts from maritime pine bark that contains 70% procyanidins, and is marketed with claims it can treat many conditions.
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Phenol – the simplest of the phenols Chemical structure of salicylic acid, the active metabolite of aspirin Chemical structure of aloe emodin, a diphenol Quercetin, a typical flavonoid, is a polyphenol Tannic acid, a typical polyphenol of indeterminate structure Lignin, is around 25% of the composition of wood This structure is repeated many ...
Grape seed extract is sold as a dietary supplement. [6] The US National Center for Complementary and Integrative Health reported that oral administration of grape seed extract (dose and frequency unreported) was well tolerated in people over 14 weeks. [1] Side effects may include itchy scalp, dizziness, headache, and nausea. [1]
The main source of polyphenols is dietary, since they are found in a wide array of phytochemical-bearing foods.For example, honey; most legumes; fruits such as apples, blackberries, blueberries, cantaloupe, pomegranate, cherries, cranberries, grapes, pears, plums, raspberries, aronia berries, and strawberries (berries in general have high polyphenol content [5]) and vegetables such as broccoli ...
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