Autumn is the season when all sorts of foods are on the market. Do you think there is a layer of white frost on many ingredients such as grapes, persimmons, and kelp? Have you ever wondered what these hoarfrosts are? Will it affect health? "Life Times" invited food experts to answer your questions.
Experts interviewed
Department of Agriculture and Biology, Purdue University, USA
Institute of Botany, Chinese Academy of Sciences
The white cream of persimmons is sugar
The water inside the dried persimmons penetrated the skin with sugar, and when the water evaporated, the sugar crystals accumulated on the surface and formed a white frost. The most abundant natural white frost is glucose, accounting for more than 50%, the taste is not very sweet, you can eat directly without washing.
Clouds have no intentions to remind that the white frost of dried persimmons can also be divided into true and false. The following methods can be used to identify: At a glance, artificial “sprinkling†dried persimmons are distributed more and evenly in white powder, while natural creams are distributed unevenly; , artificial "sprinkling powder" persimmon, white powder layer is loose, gently flick easy to fall off, while the natural frost is not easy to fall off; three tastes, the natural frost on the persimmon, persimmon cream that is the entrance, and artificial sprinkled talc Powder or titanium dioxide will not work.
Vegetable hoarfrost is a fresh "pronominal"
Like human skin, some fruits (such as wax gourd) and some stems and leaves (such as onion leaves, kale) have a layer of white frost called wax on the surface, which can protect and moisturize the epidermis of plants.
When the vegetables are fresh in general, the white frost is more pronounced. Cloud inadvertently pointed out that the white frost of wax gourd is a symbol of maturity, and the more white frost, the better it is cooked.
Kelp hoar frost
The mannitol contained in the kelp itself will be attached to the surface of kelp after the water is air-dried. It looks like a white frost and is a little sweet. Studies have shown that mannitol has a diuretic and swelling effect, which can reduce the burden on the kidneys.
However, when mannitol is dissolved in water and dried kelp is soaked in water for more than several hours, mannitol is mostly dissolved, which reduces its nutritional value. Therefore, the best way to dry kelp after foaming is to steam dry it in a steamer for half an hour and rinse it with water, which is both tender and brittle.
Many fruit hoarfrost is fruit powder
When you buy fruits, you will see a layer of white frost on the surface of the grapes. If you look closely at plums, plums, and blueberries, you will feel greasy when washing apples. These are actually fruit powders—sugar alcohol substances that are secreted by fruits and are insoluble. Water is harmless to human health. And the grape's hoarfrost contains oleanolic acid, which has certain benefits for protecting the liver and does not need to be washed off.
Shi Jun told reporters that the white frost of grapes and the fermented yeast on the web are two different things. He reminded that the normal "white frost" is naturally uniform, and the "false white cream" is unevenly distributed. There are also some dark blue marks, which may be the result of the use of pesticides.
White frost on eggs is a line of bacteria
Many people have found that some eggs also have a layer of white frost on their surface. It is actually a protective film that can act as a seal to block the pores on the eggshell. It can prevent bacteria from entering the eggs and prevent evaporation of the water in the eggs. The tenderness. However, some sellers have been wiped off with wet rags in order to sell well, so the bacteria may take advantage of it and increase the risk of deterioration. (Life Times reporter Gongyi Kong)
Food Processing Nitrile Gloves
Food Processing Nitrile Gloves,Food Gloves Nitrile,Disposable Industry Gloves,Textured Finger Free Latex Gloves
Puyang Linshi Medical Supplies Co., Ltd. , https://www.linshihealths.com