Kelp is a very common food in life. There are many ways to make kelp, which can be cold salad or soup. Kelp itself has high nutritional value and many functions. Some people will notice that when eating kelp, it seems to be covered with frost. What are these creams? Is the frost on kelp harmful to your health?

1. What is the frost on kelp?

People often think that the white things on kelp are moldy, but this is actually a misunderstanding. The layer of white powder on kelp is called mannitol. After kelp is air-dried, mannitol will precipitate and adhere to the surface of kelp to form frost.

2. Is there any frost on kelp?

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Mannitol, the cream on kelp, has the functions of lowering blood pressure, diuresis and detumescence. This substance is soluble in water, so if dried kelp is soaked in water for too long, mannitol will mostly dissolve, reducing the nutritional value of kelp.

3. How to choose kelp?

Normal kelp is dark brown, and after pickling or drying in the sun, it is naturally dark green or dark green. Kelp is the top grade, with broad leaves, dark green or purple and yellow leaves. This kind of kelp not only contains high iodine, but also contains mannitol, namely "first frost", which has high nutritional value.

4. Tips

Dried kelp should be eaten as soon as possible after buying home, and should not be stored indefinitely. Because the unpacked kelp is affected by temperature, light and other factors during storage, the nutritional components will be reduced, and microorganisms will continue to multiply, leading to corruption and deterioration.

5. How to clean kelp?

1, dust removal

There is a layer of white dust on the kelp that you just bought home, and there will be a lot of gravel attached to the kelp, so first you should remove the dust on the surface of the kelp. You can gently brush off the dust on the surface with a brush, not too hard, so as not to break the kelp.

2. Clear water invades bubbles

After removing the dust on the surface, you can soak kelp with clear water. If you want kelp to soften faster, you can soak it in warm water for about 5 hours.

Step 3 scrub quickly

Brush the kelp when it is basically soft. It may be difficult to wash by hand, because there will be a slippery film on the surface of kelp after soaking, which can be brushed gently with a brush, which is much more convenient to wash.

Step 4 soak in salt water

After brushing, put the washed kelp into clean water, add a proper amount of salt, stir to melt the salt, and soak for about ten minutes.