Why is there bubbles after bird s nest is cooked, and can you eat bird s nest with white foam after

The organic substances (proteins) in the bird's nest will rise after being heated and expanded, and many people will mistakenly think that it has been boiled, but in fact, it is not the case, after the foam rises, it must be boiled over low heat for about 5-10 minutes to ensure that the harmful substances are completely decomposed and destroyed in order to be safe to drink. The foam of bird's nest is because it boils in the process of heating, because water is a bad conductor of heat, resulting in a higher water temperature in the lower part and a lower water temperature in the upper part, and the gas is obviously affected by thermal expansion and contraction, so the bottom bubble gradually shrinks in the rising process; After boiling, the temperature of all parts of the water in the container is the same, the vapor-shaped bubbles after the water vaporizes, the bird's nest is a solid in the water, and the small bubbles are attached to the bird's nest, so the steamed bird's nest has foam, and the foam is attached to the bird's nest, which also means that the bird's nest is not fully cooked.

Pure bird's nest will be a little bubbly after stewing, bird's nest is the saliva of swallows, after high temperature stewing, release the effect of bird's nest and restore the state of saliva, we know that human saliva has a lot of bubbles, so it is normal for bird's nest to have a little bubbles after stewing. Of course, the possibility of fakes is not ruled out, usually the state of the fake after stewing is slimy, not crystal clear, and the most obvious feature of the fake is that there will be many, many small bubbles in the process of soaking.

Can you eat bird's nest stewed with a little white inside?

Bird's nest is commonly known as swiftlet.

of saliva, because it is rich in sialic acid.

and a variety of beauty and nutritional elements are sought after by all walks of life, from ancient times to the present, endlessly.

When the bird's nest is stewed, it is a normal physical phenomenon that white foam bubbles due to heating, the higher the concentration of natural bird's nest, the more white foam, the stewed bird's nest is crystal clear, full of beauty, fishy and sweet, and the texture is transparent! Therefore, the bird's nest stewed is a little white inside and can be eaten.

Can you eat bird's nest stewed with a little white inside?

Bird's nest stewed is a little white, due to heat expansion and white foam is a normal physical phenomenon, the higher the concentration of natural bird's nest, the more white foam.

The correct way to stew bird's nest.

1. Bird's nest soaking.

Take out an appropriate amount of bird's nest, soak it with pure water, it takes more than 1 hour to completely soak it, if the swallow horn part is relatively large, you can pick out the swallow horn and the hard part to continue soaking, the slightly hard one can be torn by hand in the middle of soaking, which can accelerate its soaking, and the soaking process can be changed to new water, which should be completely soft, can be rubbed by hand, and no hardness is the soaking standard.

2. Tear the bird's nest and pick out the fluff in the bird's nest.

After the soaking is completed, rub the edges, corners and large strips by hand into small silk strips, which can reduce the simmering time and the taste is more uniform, and then rinse with water 2-3 times.

Prepare a special fine-porous double-layer filter to drain the water. Carefully inspect the impurities and bird's feathers hidden in the texture of the bird's nest with small tweezers.

Singled out. 3. Stew bird's nest.

Put the washed bird's nest into the stew pot, the amount of water is not a little more than the bird's nest, about 1 cm, do not add too much water, be sure to completely immerse the stew pot in the water, but pay attention to the water level should not be too high, do not let the boiling water into the stew pot.

When the bird's nest encounters high temperatures, the water-soluble protein in it will be destroyed and the nutritional value will be lost, so it is required to stew in water to ensure that the bird's nest is heated at no more than 100 degrees Celsius.

It retains the fragrance while preserving the precious water-soluble protein.

4. Bird's nest storage.

Cool with plastic wrap.

Cover tightly and place in the refrigerator. The storage time of the stewed bird's nest is 3-5 days.

Bird's nest is a nest made of swiftlet's saliva and fluff, which is rich in protein, and when stewed, the temperature is too high to emit white foam, so the stewed bird's nest is a little white and can be eaten.

Bird's nest is a nest built by swiftlets and other swallows, it is a very good tonic, and it is also very good for **, and it is the preferred diet for many women to maintain **. Bird's nest is naturally the best to buy dried bird's nest, before making dried bird's nest, it needs to be soaked and foamed soft, and the bird's nest can be torn apart, so why can't some bird's nests be soaked?

1. The temperature is too low When the temperature is about 25 degrees, the soaking time of ordinary white bird's nest is about 4-6 hours. If it's in winter and the temperature is cold, you may not be able to soak for the same time. In addition, if you soak it in hot water, it should not be soaked for a short time.

2. Too many minerals Taking swiftlets as an example, they contain too many minerals and need to be soaked for two to three times longer than ordinary white bird's nests, and soaking usually takes 12-24 hours. If the swallow does not bubble within 4 to 6 hours, it is normal and needs to continue soaking.

3. Fake bird's nest It is not normal for the bubble rate of bird's nest to be too low or too high. If it can't be soaked, and it is pressed down and bounced up, it may be a fake bird's nest brushed with glue. And if it expands hundreds of times in volume after soaking, it may also be fake.

It doesn't have to be glued. It is very common for the bird's horn and bird's nest base to be soaked and hard.

The soaking time of bird's nest is affected by the water temperature, the size of the bird's nest, and the thickness of the bird's nest. For bird's nests, the horns and bottom are the thickest. The bird's horn is the part that the swallow uses to fix the two ends of the bird's nest, and the bottom is connected to the wall and the bird's nest cup, which can be regarded as the "load-bearing beam" of the bird's nest.

1.Seaweed Fake Bird's Nest There are also fake bird's nests made from seaweed and other things in the market. Bird's nests made from seaweed have a light seaweed flavor, pale yellow and shiny, and no egg white flavor.

But at present, there are fake bird's nests made of high imitation seaweed, which are difficult to distinguish between real and fake, and require professional chemical examination.

2.Pigskin Fake Bird's Nest Fake bird's nest made from pigskin, if you look closely, you may see debris, such as pig hair; Fake bird's nests made from pigskin have a fatty smell but don't have the egg white smell of real bird's nests. After soaking in water, there will be greasy noodles.

The color is white and mixed.

3.Gum Fake Bird's Nest Fake bird's nest made by chemically treating chewing gum, whether it is immersed in water or simmered over fire, still has a slight acetic acid smell and will be sticky when rubbed with your fingers.

4.Rubberized Fake Bird's Nest Rubberized bird's nest is coated with a layer of glue on the outside of the bird's nest, which is more common in bird's nests. The materials of glue are flour, eggs, rubber powder, glue, paste, etc., which can make the bird's nest not easy to break, and can also make the original loose bird's nest more compact and beautiful.

It also locks the water in the bird's nest to dry out the bird's nest and can add up to 30 percent of the bird's nest's weight. Sticky bird's nests smell chemicals after soaking.

The sialic acid in bird's nest contains water-soluble protein, and after being stewed at high temperature, the dried bird's nest recovers the form of saliva, and at the same time releases the effect of bird's nest, in fact, the high temperature stewing causes the decomposition of amino acids, so the bird's nest will produce bubbles after stewing. This also shows that the bird's nest has a high level of water-soluble protein.

The most precious thing in bird's nest is bird's nest acid, also called sialic acid. Medical studies have shown that sialic acid mainly acts on the human brain, and has a particularly good effect on promoting children's intellectual development, improving brain memory, delaying the intellectual aging of the elderly, and can effectively prevent Alzheimer's disease. Therefore, bird's nest is also suitable for middle-aged and elderly people.

The soaked whole bird's nest weighs about 6 7 times the original weight after draining, and feels soft and elastic.

Bird's nest is also a kind of food, and there are also grades. Good bird's nests are relatively large in size, and the soaking time needs to be longer; The soaking time of the bird's nest is shorter, and the filaments are not thick.

In order to make the bird's nest have a better hair, the water used for soaking must have good permeability and cleanliness, and the ideal choice is drinking water or cool and white, which is conducive to full soaking.

Bird's nest should be picked up first, and then soaked in water, and when the bird's nest is completely soaked, the color becomes transparent, and the hand is soft and soft, that is, it is good to soak, and then wash it, stew it in a saucepan, or put it in a pot to stew, and then put rock sugar to eat it.

See if it is soft and swollen.

Depending on the variety, the soaking time of the bird's nest is different:

Blood Bird's Nest: Soak for 6-12 hours and simmer for 1-2 hours.

White Swallow: Soak for 4-6 hours and simmer for about 30 minutes-1 hour.

Swallows: Soak for 1 hour and simmer for 30 minutes.

Swallow strips: Soak for 4 hours and simmer for 1 hour.

1. The sialic acid in the bird's nest contains water-soluble protein, after high temperature stewing, the dried bird's nest recovers the form of saliva, and at the same time releases the effect of bird's nest. This also shows that the bird's nest has a high level of water-soluble protein.

2. The most precious thing in bird's nest is sialic acid, also known as sialic acid. Medical studies have shown that sialic acid mainly acts on the human brain, and has a particularly good effect on promoting the intellectual development of children, improving brain memory, and delaying the intellectual aging of the elderly, and can effectively prevent Alzheimer's disease. Because of Youxiang, this bird's nest is also suitable for middle-aged and elderly people.