what polyphenols are in grapes
Concord grapes also contain a tiny amount of a newly discovered polyphenol called resveratrol, primarily in the skin, which may help prevent cell proliferation and cancer. Other polyphenols found in the seed, proanthocyanidins, may also prevent cell proliferation and cardiovascular disease.ince most of the antioxidants are found in the seed and skin of the grape â 80% unless the flesh is darker and has more antioxidants, a juiceâs or wineâs antioxidant content will be higher if it includes the seeds and skin. This is why red wine contains eight to ten times the polyphenol content as white wine.
A study published in the March 2008 issue of The Journal of Nutrition found that dark grapes, bilberries, cherries, apples, dark plums, blackberries and blueberries were all good sources as well. Fruit juices, such as grape juice, contain especially high levels of polyphenols.