What is the white stuff on top of blueberry
The layer of hoarfrost on the outside of the blueberry is actually a layer of wax that the blueberry itself will form during the growth process. The hoarfrost can protect the blueberry from slowing down the rate of water loss in the blueberry fruit, and it also makes the surface of the blueberry less prone to breeding due to high humidity. Fungus. The nutritional value of this layer of hoarfrost is very good for delaying aging and protecting children's eyesight.
Hoarfrost is the white frost that is formed by the natural secretion of fructose liquid during the blueberry growth process. It is called fruit powder. Its composition is fructose, which is not harmful to the human body. The more quality the blueberry hoarfrost, the thicker it is. Only fresh blueberries can see the white frost.
In addition there are white frosts on fruits such as grapes.
White frost is still a sign of fresh blueberries. Blueberries that haven't been picked in the garden are fresher than the blueberries on the market, and the white frost is also thicker, so pick the blueberries to choose a surface with white frost. Since blueberries are less pests in fruits, the blueberries planted in ecological parks hardly hit pesticides. Xu Gongjun emphasized that you should never think this layer of hoarfrost is a “pesticide residue†to be washed out. Really if there is a blueberry on the surface Dust, just flush with water.
The effect of fruit powder
Although there is fruit powder that makes the fruit look misty and seems to be a bit dirty to wash away, this layer of material protects the blueberries. These fruit powders coat the blueberry's surface, reducing the evaporation of surface moisture and preventing blueberries from shrinking. It is able to form an internal dry environment, is not easy to rot, and is not easy to infect each other. It is good for the fruit itself. This material also contains some nutrients that are harmless to the human body.
Blueberry selection method
1, to see the number of white fruit on the surface of the fruit, blueberry cream and more fresh high, less or no fruit cream, blueberry freshness is poor;
2. Check the bottom of the blueberry box. If a pink liquid is found, it indicates that there is rotten fruit in the box. In Japan's high-end supermarkets, fresh blueberries must be thrown away the same day. In Hong Kong supermarkets, fresh fruits cannot be sold on the same day and prices are reduced by about 50%. Therefore, the price of fresh fruits sold in supermarkets is related to freshness and does not represent the true market price.
3 Like many fruits, fresh blueberries should be firm and look dry, full and smooth. In general, blueberries do not carry leaves and stems. Keep in mind that the size of the head is not an indicator of whether the blueberry fruit is mature, but the color of the blueberry is important. The fruit of ripe blueberries should be between deep purple and blue black. This blueberry is delicious!
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