Which color of grape nutrition is better? Does the white frost wash away? In the end, grape skins can't be eaten... Grapes are on the market, and similar questions are plaguing many people. "Life Times" specially invited Professor Fang Yulin of the Institute of Agriculture of Northwest Agriculture and Forestry University and Xu Haiying, a researcher of the Institute of Forestry Fruit Research of Beijing Academy of Agriculture and Forestry Sciences, to answer questions for everyone.
What are the differences in the nutrition of different colors of grapes?
Common grape colors in the market are white green, purple, black and red. They differ slightly in nutrition and therapeutic efficacy: Purple grapes are rich in anthocyanins and flavonoids, both of which are very strong antioxidants. The ability to fight and remove free radicals in the body helps prevent aging. In addition to anthocyanins and flavonoids, black grapes contain slightly higher levels of minerals such as potassium, magnesium, and calcium than other colors; red grapes contain reversal. Enzyme, this enzyme helps slow down the accumulation of cholesterol on the arterial wall and has a certain effect on the prevention of cardiovascular disease; white-green grapes are lower in anti-oxidation than dark grapes, Chinese medicine has "white lung", "lung "Leather" said that white grapes can replenish lung, have lung function, and are suitable for coughing, suffering from respiratory diseases and poor skin color. In short, each color of grapes has its own specialties, and everyone can change colors to eat.
Is grape size related to nutrition?
There is no necessary connection between the two. Because the size of the grapes is affected by many factors, such as variety, field management, and weather, it is unscientific to tie the size of the grapes to nutrition. Grape varieties used for winemaking generally require small fruit pieces, thick fruit skin, seeds, and high juice yield; whereas, fresh grape varieties generally require large fruit pieces, thin peels, beautiful appearance, and less seeds.
Is the big grape a hormone?
In the process of growing grapes, in order to enlarge or ripen their fruits, they may use plant growth regulators called cytokinins, which are commonly known as swelling agents. However, they are basically within the scope of safety. They are counterproductive because they are used in large quantities and are now developed in Europe and America. The country is also using it. The size of the head is not related to whether or not the bulking agent is used. It is mainly influenced by the species, the growth environment and other factors.
Is seedless grapes used in birth control pills? What are the differences in nutrition with seeds?
The seedless grapes currently on the market are classified into haploid seedless and technical seedless. For example, the Kyoho grape, which is cultivated in large areas in China, itself produces seeds. However, if a certain concentration of gibberellin is used during the flowering period of the grape and the young ear formation period, the seed development can be inhibited and the fruit enlargement can be promoted, thereby obtaining the seedless Kyoho grape. The gibberellin-treated grape not only achieves a high seedless rate, but also increases the size of the fruit. Gibberellin is an internationally recognized plant hormone commonly used in production. Reasonable use is not harmful to the human body. In addition, this plant hormone has nothing to do with the "contraceptive" mentioned in the rumors, because the contraceptive is an animal hormone and has no effect on plants. In fact, whether seeds or seedless grapes, just the differences in the varieties, there is no significant difference in nutrition.
Is the white frost on the grapes a pesticide? Must you wash it?
The white frost on the grapes is sugar alcohols secreted by the fruits and vegetables themselves. It is also known as fruit powder and belongs to the biosynthesis of natural substances. This type of compound is insoluble in water, but soluble in organic solvents such as chloroform, so no matter it is used for blistering, washing or hydrazine can not be completely removed. In fact, grapes are fruits that are not susceptible to insects, and most of them are now bagged. The probability of using high concentrations of pesticides is very small. Therefore, if it is determined that the grape itself is white, there is no need to wash it off. To some extent, taking white frost is a sign of fresh grapes, but it does not prevent individual businesses from spraying low concentrations of bactericidal pesticides. The distinguishing method is that the normal “white frost†is distributed naturally and does not cover the color of the grape epidermis itself, making the grape look more beautiful. The appearance of the “hoar cream†agent is unevenly distributed, and there are still dark blue marks.
Can grape skin be eaten in the end?
Grape skin contains resveratrol, which has a certain role in lowering blood fat, preventing arteriosclerosis, and enhancing immunity. Among them, anthocyanins have strong anti-oxidation, cardiovascular protection and other functions, so "eat grapes do not spit grapes skin" It makes sense. Need to remind everyone to clean the grapes before eating the grape skins.
Does grape seed have the same therapeutic value as the health foods they use?
Grape seeds are rich in active substances such as resveratrol, tannins and flavonoids. Grape seeds directly taste bitter, easily lead to tingling tongue. Grape seed health products refer to the leftovers of wineries. After being sun dried, they are separated from grape skins and grape stems. They concentrate the active ingredients in grape seeds and their antioxidant capacity has also been improved. What needs to be reminded is that although the health care products like grape seeds are very strong in antioxidants, studies have shown that large amounts of food are harmful to health, so it is best to take them under the guidance of relevant professionals.
Picking grapes, the closer the fruit, the better?
This statement is not correct. Because the fruit is too tight, the light received at the base of the fruit will be affected when it grows. It is prone to the phenomenon that the top of the fruit is purple and the bottom is blue, resulting in different tastes of the grapes in different parts. In addition, the fruit is too dense and susceptible to insect pests due to crushing. Therefore, moderately loose grapes are worth buying.
How much does the grape eat every day? Who should eat less?
Although the grapes are rich in nutrition, sweet and delicious, but you can not eat more, the amount of 200 to 350 grams per day is appropriate. Grape cold, often constipation, spleen and stomach Deficiency people should eat less.
How does the grape clean the most clean?
After rinsing with running water, use scissors to cut them into small strings that are easy to clean. If you do not bother, you can cut them into single pieces. Be careful not to hurt the flesh. Then, soak it in clean water for about 10 minutes. During this process, a small amount of flour can be added to help absorb dirt and other dirt on the surface of the grapes. Finally, rinse with water. (Source: Life Times)
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