It was the golden season of eating persimmons, but there were some sayings that made people plop through: the white frost on persimmons is flour, and the white frost on grapes is pesticide... In fact, these things are not as terrible as everybody imagined. Today we talk about what the hoarfrost on these fruits is. As for the white frost on the surface of blueberry, plum and other fruits, it is similar to the white frost of grapes. When washing these fruits later, it is unnecessary to compete with this layer of white frost. Incidentally, apple waxing is a deceptive thing. Apple skin does have fruit wax on the surface and it does not need to be waxed. Wireless Ballbar For Machine Tool,Machine Tool Performance Verification,Ballbar For Sale,Wireless Ballbar Automated Precision Inc. , https://www.apiasean.com
Is the white frost on the dried persimmon flour?
Persimmon cream is icing
A friend said: The persimmon must have been made up with flour, otherwise the persimmon on the balcony of the house will be dry. How can it not be white frost? Don't forget me, and admit to using flour. This is really a persimmon. There is no frost in the sun because you are not peeling. Yes, yes, the first step in making persimmons is peeling. Of course, the selected persimmon should not be too soft.
In the course of drying persimmons, the water inside the fruit penetrates into the peel, and as the water evaporates, the sugar crystals of the persimmon gradually accumulate to the surface. However, this icing sugar is not the same as the sugar inside the persimmon. During the run out of the fruit, sucrose is converted into fructose and glucose, and the relatively sweet fructose is turned into mannose. Therefore, the icing on the surface of the persimmon is not very sweet, giving people a feeling of eating flour.
Is there any dried persimmon? Actually there is really. However, the difference between the two is obvious. The icing and the dried persimmon are very tight and have a sticky feel, but if it is flour, it is only creamy and it is easy to get rid of.
Grape hoarfrost is waxy
There is a lot of white frost on the grapes. Many friends are afraid of pesticides. In fact, the white frost on the surface of the grapes is waxy. Their composition is mainly oleanolic acid, which can account for 60% of the total weight of the white frost. 70%, in addition, white frost also contains some alcohol and esters. The trouble is that these waxes do not dissolve in the water, so washing with running water is not washable.
If everyone thinks that grape white cream is not good at it, it still needs to be washed out. Which method is effective, such as using flour, alkali, and salt in the net? Flour can really remove the white frost, because when the starch is dissolved in water, it can be combined with the wax on the surface of the grape, and then washed with water, and the white frost can be easily removed. Alkali surface (soda) can form an alkaline environment, it will also promote the dissolution of some esters, and it is helpful for the cleaning of white cream. However, the amount of alkali must be properly cleaned. Salt is not so magical, salt water does not improve the solubility of these waxes.