Fall is the season of fruit, but in my opinion, a wide variety of fruits, the most beautiful person than a grape. Not only the appearance of sweet grapes, but also very sweet. Whether it is in Xinjiang sweet seedless grapes, or Muscat Hamburg grape fragrance, are the fruit of my heart the best sense of beauty.
sweet grape reason is because of its sugar content far exceeds the apple-pear桃杏like ordinary temperate fruits, up to nearly 20% . Since the high-sugar, grape juice are so sticky. It is rich in potassium and magnesium, in the fruits of which have relatively high iron, must have a tonic effect.
However, these grapes are not subject to international attention, becoming the second largest fruit crop of the main reasons. Today it has huge production, mainly because one of the reasons are used to make wine. Wine for its health value has been sought after by the people of the world, and this health grounds, in fact, comes from grapes, grape skin and are the main grape seed polyphenols in the health care component.
wine health a key role in the world famous composition, is one of the resveratrol. This substance has a very strong antioxidant, anti-cancer, anti-cardiovascular disease, anti-radiation, anti-inflammatory and antibacterial effects, but it mainly in grape skin and seeds, the pulp content of only a fraction Piribebuy one to several per cent.
another grape special health component called polymeric procyanidins. Health effects of such substances have been many more and more attention, including extremely high antioxidant activity, anti-cancer, anti-mutagenic, anti-radiation, the prevention of cardiovascular disease, and promote tissue repair and improve the skin and so on. The so-called grape seed extract because it is valuable. Such substances are not on吃葡萄flesh, because it exists in the seed.
At the same time, skin and seeds also contain many tannins and flavonoid substances, they have antioxidant health effects of wine is also part of the grounds.
Therefore, it was suggested that吃葡萄should not吐掉grape skin, the best seeds together even stop it or else thrown into the dustbin pity. However, ate grape skin and grape seed, really can be one of the precious吗?
not necessarily the case.
put grape skin and grape seed chew swallow the results go only waves are tongue numb, I feel very comfortable, half-day every ease, however COME. This is substantial because it contains tannins, it solidified the tongue, oral cavity and esophagus surface protein produced a strong astringency. At a certain extent, this kind of material like persimmon tannin, like to eat when the substantial damage the digestive tract.
to pay such a large price, one of the active ingredients will still be wearing intestinal over, and should not like to drink wine, as being easy to absorb.
In fact, grape skin contains resveratrol, or polymeric proanthocyanidins, or that they are difficult to dissolve in water. Resveratrol soluble in ether, chloroform, methanol, ethanol, acetone and so on. And grape seed which polymeric proanthocyanidins were soluble in methanol, acetone, ethanol and ethyl acetate. Therefore, it is commonly used a mixture of ethanol and water to extract these components.
According to the literature reported that resveratrol at the water-soluble at room temperature is very bad, but at 10% alcohol which (v / v) up to 40 mg per liter, which has put enough resveratrol in grape skin dissolved out fully; and with higher alcohol content and temperature, the solubility will continue to rise. Even with Cyclodextrin encapsulation methods such as allowing resveratrol dissolved in water, its bioavailability is not satisfactory.
This will understand why moderate drinking of red wine beneficial for health. Alcohol is a mixture of ethanol and water, using alcohol soaked for some time, can be effectively extracted from grape skin and seeds of which the active ingredient than the effect of water immersion is much better. Moreover, the wine itself must preservative role, you can soak a lot of days, the extraction of active substances are quite well; and water immersion only some hours to some ten hours, the time may be longer spoilage.
so that For grape skin and grape seed which the benefits of teeth to chew with his tongue to mixing with saliva to extract the effect are quite unsatisfactory. Method is a relatively well-made wine, want to access to health care components of friends, may wish to try their own.
first prepare a can of low prices of liquor, put Muscat Hamburg grapes and other dark skin tore off to go into the substantial manner;吐掉their use of grape seed smashing a hammer or blade, but also thrown into the go. Lid sealed with foam 2 weeks, shaking often. Over time, the grape skin color faded, and the growing red wine color. At this time, to filter out waste products, or go above the clear juice, grape skin has become a wine seed health. Because of the grape polyphenols have astringent, so the hair Shibuya Taste wine, like wine, like the Federation has some astringency. However, because this wine is not wine's aroma, taste so bad some more. If you put it and fruit juice, especially grape juice together against drinking, can greatly improve the taste.
Main References:
1 Filip V, Plocková M, Smidrkal J et al. Resveratrol and its antioxidant and antimicrobial effectiveness. Food Chemistry . 2003. 83 (4): 585-593
2 Das S , Lin HS, Ho PC et al. The impact of aqueous solubility and dose> 3 Chen Lei, Han Yashan. grapes of different varieties and tissue differences in resveratrol content. horticultural journals, 1999. 26 (2) :118-119
4 Lee Yin-ping Xue Xue equality, grape seed composition and nutritional assessment, food and fermentation industry, 2006. 32 (12) :108-113
5杨玉红,张慧霞. Proanthocyanidins grape research progress of the biological activity. agricultural products Processing Journal, 2008 (5) :40-42
6 Li-hua, Wei-Jun Wang. resveratrol research and application prospects. ; Chinese Brewing, 2008 (7) :10-12
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