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What is the frost on the grape skin? What is white grape skin?
Many people still like to eat grapes in summer. Grape is a common fruit, which is really delicious and has high nutritional value. But when buying grapes, we should pay attention to that some grapes have hoarfrost on their skins, and some people think they can't be eaten. What is the frost on the grape skin? What is white grape skin?

1, what is frost?

There are two kinds of hoarfrost on the grape skin. One is the crystallization of sugar, and the main component is yeast. Another situation is pesticide residue, so when you find hoarfrost on grape skin, you should know what kind of substance it belongs to.

2. How to distinguish normal hoarfrost

Normal yeast-like frost is evenly distributed on the surface of grape skin and will not cover the color of grape skin itself; If it is the residue of medicine, the appearance distribution is uneven, and there will be some dark blue traces inside. In this case, be sure to wash thoroughly before eating.

3. How to clean "frost"

If the hoarfrost on the grape skin belongs to pesticide residue, it should be carefully cleaned. The following methods can be used for your reference:

(1) toothpaste cleaning

1. Cut the grapes with scissors first, and be careful not to pick them at will, so as not to damage the skins of the grapes, which is not conducive to cleaning.

2. Rub some toothpaste on your hands.

3. Rub the toothpaste on your hand in the grape grains, and finally wash it with clear water.

(2) Flour cleaning

1. First, wash the magazines on the surface of the grapes with clean water.

2. Cut the grapes with scissors, put them in the pot, and add one spoonful of salt and two spoonfuls of flour.

3. Add water, gently stir by hand (water cooling in winter, you can consider stirring with other soft objects), stir clockwise or counterclockwise, and then let it stand for about two minutes.

4. Take it out and rinse it with clean water.

4. Can I eat after washing?

Grape epidermis has certain nutritional value, which can promote microvascular circulation, reduce blood sugar and promote digestion. If the grape skin is washed clean, it can be eaten with meat; You can also dry the grape skins separately and cook them.

5, the role of hoarfrost on grape skin

If the frost on the grape skin is crystallized from sugar, in fact, this frost has certain benefits:

(1) Ensure grape moisture.

Drought is inevitable during grape growth. At this time, the frost on the grape skin can prevent the rapid evaporation of water and ensure the grapes to shrink without losing water to a certain extent.

(2) reduce the penetration of germs

The frost on the grape skin can effectively prevent the penetration of germs, because this layer of frost is insoluble in water, which can effectively avoid the humid environment on the grape surface, thus reducing the penetration of germs.

(3) Wine without yeast

The normal component of hoarfrost on the surface of grape skin is yeast, so many farmers never need another yeast when making wine.

6, warm tips

Although the frost on the grape skin has a good effect, many farmers may spray drugs on the grape skin for the convenience of transportation and preservation. Therefore, for the sake of safety, I suggest you clean up the frost on the grape skin before eating grapes.

7. Nutritional value of grape skin

(1) Supplementing the nutrients needed by the body

Grape skin is rich in fiber, iron, pectin and other minerals, which can supplement the nutrients that the body lacks.

(2) Protect the skin

Tannin contained in grape skin can prevent ultraviolet rays from damaging skin, effectively prevent sun exposure and prevent the formation of various stains.

(3) improve the body's immunity

Anthocyanins contained in grape skin have antioxidant activity, anti-cancer, anti-mutation, anti-radiation, cardiovascular disease prevention, tissue repair and skin improvement, and immunity improvement.

(4) lowering cholesterol

Grape skin contains flavonoids, which can effectively reduce the content of cholesterol in blood and prevent atherosclerosis. The darker the grape skin, the better the effect.

(5) improve sleep

Grape skin can stimulate the pineal gland in the brain to secrete melatonin, which helps to regulate the sleep cycle and improve sleep.