Grapes of resveratrol has very strong antioxidant, cancer prevention, prevent cardiovascular disease, resist radiation, anti-inflammatory and bacteriostasis effect, but it mainly exists in grape skins and seeds, the content of the pulp only skin to a few fractions of a percent.
Another component of grape called the special health polymeric procyanidins. Health effects of such substances has been more and more attention, including extremely high antioxidant activity, anti-cancer, anti-mutation, anti-radiation, prevention of cardiovascular disease, and promote tissue repair and improve skin and so on. The so-called grape seed extract is valuable because of it. This substance is not flesh by eating grapes, because it only exists in the seeds.
Meanwhile, skin and seeds also contain large quantities of tannins and flavonoids, which have antioxidant, is also part of the reason for the health effects of wine. Therefore, it was suggested that grapes can not spit grape skins, seeds are the best even eat together, or trash a pity. Really true?
The grape skin and grape seed chew swallow results, only bursts of tingling the tongue, feeling very uncomfortable. This is because it contains a lot of tannin, it solidified the tongue, mouth and esophagus the surface of the protein, resulting in a strong astringent taste. To some extent, this kind of material as in persimmon tannin, like eating a lot of prejudice when the digestive tract. Even so, the active ingredients of which are still wearing intestine through, and did not like to drink wine, be easily absorbed.
It turned out that resveratrol contained in grape skin Ye Hao, Ye Hao polymeric procyanidins, which are difficult to dissolve in water. Resveratrol is soluble in ether, chloroform, methanol, ethanol, acetone and so on. And among the polymeric grape seed proanthocyanidin is soluble in methanol, acetone, ethanol and ethyl acetate. So, people used a mixture of ethanol and water to extract these components.
So that you can understand why the amount of drinking red wine may be beneficial to health. The grapes seed skin is “asking for trouble. ”