When buying grapes, it is often seen that the surface of the grapes has a "white frost" and it is difficult to wash off. Someone told me that this layer of hoarfrost is actually a pesticide and can be washed off with flour. Is that really the case?
Xu Haiying, a researcher at the Beijing Forestry and Fruit Research Institute of Beijing Academy of Agriculture and Forestry Sciences, said: Not only does the grape surface have white frost, careful consumers will find that there is a similar layer of white frost on the surface of plums, sugar cane, blueberries and even melons. In fact, this layer of hoarfrost is a sugar alcohol substance secreted by fruits and vegetables, also known as fruit powder, they belong to the biosynthesis of natural substances, is completely harmless to the human body. This type of compound is insoluble in water and soluble in organic solvents such as chloroform. Therefore, no matter whether it is used as a blisters, or as a wash, it cannot be completely removed from the peel. Legend has it that flour can be used to wash away the white frost. It is not really washed out of the white cream, but it changes the structure of the white frost or blocks the gap between the white frost crystals.
This layer of fruit powder has a protective effect on the fruit. For example, the layer of fruit powder on the surface of the grape can reduce the evaporation of water, thereby preventing the fruit from rapid water loss and shrinkage after picking, and has a positive effect on adapting to the arid environment. The insoluble nature of the fruit powder prevents the formation of a moist environment on the surface of the grapes, thus reducing the infestation of pathogenic bacteria. The white frost on the grape's surface also contains yeast, so homemade wines can be fermented without the addition of yeast. It should be explained that grapes are fruits that are not susceptible to insects, and most of them are now bagged. The probability of using high-concentration pesticides is very small. Therefore, if it is determined that the grape itself has white frost, there is no need to wash it off.
To some extent, taking white frost is a sign of fresh grapes, but it also cannot prevent some merchants from spraying low concentrations of bactericidal pesticides. The specific method of differentiation 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. If the drug is "white frost," the appearance is unevenly distributed, and there are dark blue marks.
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