Why can t hard boiled eggs be soaked in cold water

Hard-boiled eggs are a relatively hygienic food because they are kept by the shell and are not easy for microorganisms to invade. However, in daily life, people often put freshly boiled eggs into cold water to soak them immediately in order to make it easier to peel the shell, but they don't know that this is very unscientific.

Freshly laid eggs are not easily invaded by bacteria because they are covered by a membrane on the eggshell, and the water in the egg is not easy to evaporate, so fresh eggs are not easy to spoil for a certain period of time. After the egg is cooked, the membrane on the shell is destroyed, and at the same time, because the double membrane inside and outside the shell is partially covered with many small holes, when the cold air enters the egg, bacteria, mold and other microorganisms will also enter the egg, and decompose the egg contents together with the enzymes in the egg, causing the egg to spoil. In addition, there is an air chamber with a diameter of 4-11 mm in the egg, and when the egg is boiled, due to the increase in temperature, the air pressure in the air chamber also increases, and the gas in the air chamber will be "squeezed" out of the egg.

When a hard-boiled egg is thrown into cold water, the temperature drops sharply and the pressure inside the air chamber drops, which also causes cold water and microorganisms from outside the shell to enter the egg through the pores.

The correct way is to take out the hard-boiled eggs and immediately wipe the water on the surface of the eggshell with a clean rag and let it cool naturally, which is easy to peel and conducive to preservation.

It's okay to soak for a while, and it's easy to peel.

Eggs cannot be cooled in cold water after they are cooked.

Immersing the hard-boiled eggs in cold water can indeed make the eggs cool down quickly, and the inner eggshell membrane and the egg white membrane are easy to form a certain void due to the different degrees of shrinkage in case of cold, making the eggshell easier to be peeled off.

However, this will decompress the air chamber, and because the eggshell and the membrane inside the shell are distributed with many small closed pores, cool water will enter the eggshell through the pores. So hard-boiled eggs, it is best to let them cool naturally.

Tips for boiling eggs:

1. Eggs should be fresh.

Fresh eggs, the yolk is in the middle, the egg white is also relatively viscous, the nutritional value is correspondingly high, and the taste is fresh and tender after cooking.

2. Soak in salt water.

Before boiling eggs, wash off the dirt on the surface, wash the shells with a rag, and then soak them in salted water for 10 minutes.

3. Start boiling with cold water.

Because of the pot under cold water, the eggs will not tumble, so there is no need to worry about breaking the shell, and as the water temperature rises, the egg whites solidify and will not leak out. When boiling an underwater pot, the eggs will immediately tumble with the boiling water, and cracks will occur in the process of hitting the walls of the pot, and the temperature will burst when the temperature rises.

Eggs are suddenly thrown into cold water after they are cooked, which is actually causing a sudden change in temperature. But this change does not occur naturally, so it will greatly destroy the nutrition and taste of eggs, originally boiled eggs are a very green food, no oil and no salt may destroy their own nutrition for a while, etc., it is very good for the human body, but a cold shower throws away all the work, it is not worth it. The boiling water makes the eggs tumble in the pot, it is easy to break the eggshell, and even expose the protein coagulation and denaturation in the egg whites, which does not require a very high temperature, generally 60 -87, while the temperature of boiling water can reach 100.

If you cook the egg whites, they may be as old as rubber. So when boiling eggs, you should open the lid and let the water bubble slightly, not boiling. It is best not to soak the eggs in cold water after boiling.

Soaking hard-boiled eggs in cold water will indeed make the eggs cool down quickly. Due to the different degrees of shrinkage of the inner shell membrane and the protein membrane when exposed to cold, it is easy to form certain gaps, which makes the eggshell more likely to be peeled off. But this ignores the fact that cold water is full of bacteria.

The protein in eggs is coagulated and denatured, and does not require a very high temperature, generally 60 -87, while the temperature of boiling water can reach 100. If you cook the egg whites, they may be as old as rubber. So when boiling eggs, you should open the lid and let the water bubble slightly, not boiling.

It is best not to soak the eggs in cold water after boiling. Soaking hard-boiled eggs in cold water will indeed make the eggs cool down quickly. Due to the different degrees of shrinkage of the inner shell membrane and the protein membrane when exposed to cold, it is easy to form certain gaps, which makes the eggshell more likely to be peeled off.

But this ignores the fact that cold water is full of bacteria.

After the egg is heated, it can prevent the bacteria from being destroyed by the eggshell membrane, so that the eggshell vent no longer has the effect of blocking bacteria, and putting the hard-boiled eggs into cold water can indeed make the eggs cool quickly, and the eggshell membrane inside shrinks to varying degrees due to cold shrinkage, which is easy to form a certain gap, making the eggshell easier to be peeled off. But this ignores the fact that cold water is full of bacteria. When the egg is heated, it prevents bacteria from passing through the membrane of the eggshell and is destroyed, so the pores on the eggshell can no longer prevent bacteria from entering the egg, and bacteria can enter and exit freely.

Hard-boiled eggs are immersed in cold water, which contains a large number of bacteria. When the egg is heated, the eggshell membrane, which prevents bacteria from passing through, is destroyed, so that the eggshell vent no longer has a blocking effect on bacteria, so it is very easy for bacteria to invade the egg.

The correct method is to add a small amount of salt in the process of boiling eggs, which can not only sterilize and detoxify, but also form a certain gap between the eggshell membrane and the egg white membrane due to the different degrees of shrinkage, so that the eggshell is easier to peel off.

Hello!!

One: The knowledge of eating eggs:

1) Raw eggs should not be eaten.

2) The heating time should not be too long.

3) It is not advisable to use soy milk to wash eggs.

4) Don't eat too much.

5) Eggs should not be stored horizontally.

6) Dirty eggs should not be rinsed with water.

7) Hard-boiled eggs should not be cooled in cold water.

8) When taking aminophylline drugs, it is not advisable to eat more eggs.

9) MSG should not be put in scrambled eggs.

10) It should not be eaten at the same time as soft-shelled turtle.

11) It is not advisable to eat stillborn eggs.

20) It is not suitable to consume sulfonamides and sodium bicarbonate when taking them.

13) Those who have stagnant food should not eat.

14) Do not eat too much when taking levodopa.

15) Do not eat red-skinned eggs.

16) It is forbidden to eat rotten eggs.

17) It should not be eaten at the same time as rabbit meat.

18) It should not be eaten at the same time as carp.

19) It should not be eaten at the same time as raw onion and garlic.

20) It should not be eaten at the same time as soy milk.

Two: Benefits of Eating Eggs:

Chicken embryo eggs have the effect of replenishing qi, and regular consumption can make the complexion ruddy, increase appetite, strengthen the body, and delay aging. It is said that the protein content of chicken embryo eggs is higher, because the nutrition of eggs is not destroyed during incubation, but is enhanced by incubation. In addition, it contains certain components similar to the "human placenta", which can improve gastrointestinal function, increase appetite and anti-aging effects.

However, most of the chicken embryo eggs on the market are eggs used to hatch chicks, which are chicken embryo eggs that have stopped developing and died in the shell due to improper temperature, humidity or infection with germs. The original nutrients such as proteins, fats, sugars, inorganic salts and vitamins contained in this dead embryo egg have been completely or partially changed, and most of them have been used and consumed by the embryo, and there is very little nutrients left. It has been determined that almost 100% of the dead embryo eggs contain pathogenic bacteria, such as E. coli, staphylococcus, typhoid bacillus, proteus, etc.

Eating this stale dead embryo egg not only has low nutritional value, but also is prone to poisoning, causing dysentery, typhoid, hepatitis and other diseases.

Three: On the question of choleguthenol in egg yolk:

Egg yolk contains more cholesterol, which can be as high as 1705 mg per 100 grams, so many people, especially the elderly, are wary of eating eggs, fearing that eating eggs will cause high cholesterol and lead to atherosclerosis. In recent years, scientists have found that although eggs contain more cholesterol, they are also rich in lecithin. When lecithin enters the bloodstream, it makes the particles of cholesterol and fat smaller and keeps them in suspension, thus preventing the deposition of cholesterol and fat in the walls of blood vessels.

Therefore, scientists believe that for elderly people with normal cholesterol, eating 2 eggs a day will increase the cholesterol in 100 ml of blood by up to 2 milligrams, which will not cause hardening of the arteries. But you should not eat too much, eating too much is not conducive to the digestion of the stomach and intestines, resulting in waste, and will also increase the burden on the liver and kidneys. It is advisable to eat 1 2 eggs per person per day, which is not only conducive to digestion and absorption, but also can meet the needs of the body.

I wish you good health!!

When eggs are freshly cooked, they are so hot that it is difficult to peel them with bare hands. In order to peel the shell quickly and keep the egg whites from sticking to the shell, many people will use cold water to rinse or soak them. This very common practice is actually unscientific.

It turns out that this will give bacteria a chance to invade the egg, because when cooling, a gap is formed between the egg white and the shell membrane, and the bacteria in the cold water will take the opportunity to enter, and people can easily get sick after eating. The best way to do this is to add a small amount of salt to the water when boiling the eggs, so that as long as the cooked eggs are cooled slightly, gently tap the shell, and the smooth and intact eggs can be peeled out whole.

Boiling water to wash eggs has been circulating in the folk for a long time, many older generations of people like to eat breakfast, with boiling water to wash egg flowers, eggs are good to eat, eggs can be cooked in boiling water, today let's learn about whether boiling water and eggs are nutritious.

1. Wash the eggs with boiling water to see if they can be cooked.

Generally, the practice of washing eggs with boiling water is called "washing egg flowers", and the toxic protein in eggs can only be denatured after maintaining them for more than 10 minutes. If the heat transfer is poor, the heating time should be extended, or the heating temperature should be increased. When making egg drops, even if you use boiling water, the temperature will drop quickly, and it will not meet the requirement of "80°C or more, maintain it for more than 10 minutes", so the eggs will not be cooked.

2. Boiling water to wash eggs is not nutritious.

Boiling water to wash eggs because the eggs are not fully cooked, so that the human body can not fully absorb the nutrients of eggs, eggs will have a fishy smell, raw egg white has some toxic proteins, also known as nutrient inhibiting proteins, such as egg white protein that interferes with the absorption and utilization of iron by the human body, avidin that inhibits the absorption and utilization of biotin, and lysozyme that inhibits mucopolysaccharidase, etc., they will make it difficult for people to digest and absorb various related nutrients, so boiling water to wash eggs is not nutritious.

3. How to eat eggs nutritious.

The most nutritious way to eat eggs is boiled, studies have shown that the protein digestibility of boiled eggs is high, almost all can be absorbed by the human body, and the heating temperature is low, the nutrition can be most fully retained, the cholesterol in the egg yolk is not in contact with oxygen, once the cholesterol is oxidized, it will become a threat of cardiovascular disease.

Method: Pot under cold water, heat up slowly, boil for 3 minutes without fire after boiling, and soak for 5 minutes after stopping the fire.

4. What is the harm of boiling water to wash eggs.

1. Bacterial infection: eggs are produced by the ovaries of chickens, and its ovaries, cloaca bacteria carry rate is very high, the surface of the eggshell and the yolk are likely to have been contaminated by bacteria, boiling water to wash the eggs can not completely kill these bacteria, will cause bacterial infection.

2. Affect appetite: boiling water to wash eggs will have a fishy smell, which can inhibit the central nervous system, make people's appetite decrease, and sometimes accompanied by nausea and vomiting.

3. Indigestion: boiled eggs are generally half-cooked, which affects the digestion and absorption of protein, and the protein is not fully cooked, and it is difficult for the body to decompose and digest, which will increase the burden on the stomach and intestines and cause indigestion.

5 contraindications for eating eggs.

1. After the fresh egg is broken, if there is a black substance, it means that toxic substances such as hydrogen sulfide have been produced, and the egg has been spoiled and cannot be eaten.

2. Eggs should not be eaten too much at a time, eating too much will make the indigestible protein spoil in the body, which will have a toxic effect on the human body, and the cholesterol in the egg yolk is high, and it is easy to cause elevated blood lipids.

3. It is not advisable to drink tea after eating eggs, because the tannic substances in tea will prevent the absorption of protein, iron, calcium and other nutrients in eggs.

Experiments have shown that the protein of an egg can coagulate at 80 degrees Celsius. Therefore, if you want to cook an egg, you can theoretically only need to keep it above 80 degrees Celsius for a period of time. Therefore, if the water temperature can be maintained at 100 degrees Celsius for more than 8 minutes, the eggs can be cooked.

Note: It is only possible to maintain the water temperature under the premise that the water temperature can be maintained, if the water is too small or the heat is dissipated too quickly, the cooking effect cannot be ensured.

2.Efficacy. The main effect of boiling water to wash eggs is to remove fire and moisten dryness and cough and lungs, and its effect also has its own focus when paired with different ingredients. It is mainly seasoned with rock sugar and sesame oil, which has a good therapeutic effect on sore throat caused by fire. The main cough is seasoned with honey and sesame oil, which has a very good effect of moistening the lungs and relieving cough, but honey cannot be added when relieving the cough of children.

3.Method. Wash the shell of the raw egg first, and then blanch it in boiling water for about 10 minutes. Pour boiling water into the container to be used to wash the eggs, and blanch the container for about 10 minutes, which can not only sterilize and sterilize, but also ensure that the egg liquid is blanched until it is completely cooked. Boil the water when the eggs and the container are boiled, pour out the hot water in the container when the water is about to boil, beat the eggs and beat until they are foamy, and rinse the egg mixture immediately after the water boils.

In order to ensure that the egg mixture is completely cooked, cover and simmer immediately after rinsing into boiling water, and simmer until it cools down to about 60 degrees before seasoning.