Why do boiled eggs have a pungent smell?

Because of the deterioration that occurs in the egg, it is producedHydrogen sulfide, so there will be a pungent smell similar to ammonia.

Hydrogen sulfide in standard condition.

The following is a flammable acid gas with a molecular weight of ; colorless and toxic; There are rotten eggs at low concentrations.

Smell; Its aqueous solution is hydrosulfuric acid.

Hydrogen sulfide is soluble in water, soluble in alcohols, petroleum solvents and **, etc. Hydrogen sulfide is a flammable and hazardous chemical.

Mixed with air can form a ** mixture, which will cause combustion in case of open flame and high heat energy. In addition, hydrogen sulfide is also an important chemical raw material.

Tricks for boiling eggs.

1. Soak in water. Before boiling eggs, it is best to soak them in cold water for a while. At the beginning of cooking, the water must be submerged over the eggs, otherwise the boiled eggs will not only be unevenly cooked, which will affect the taste, but the yolk will also move out of the egg core and move to the eggshell.

Soak the eggs in cold water for a while to reduce the air pressure inside the eggs; Then put it in a pot of cold water and boil so that the eggshell is not easy to break.

2. Firepower. If high heat is used when boiling eggs, it is easy to cause the air in the eggshell to expand sharply and cause the eggshell to burst; If you use low heat, it will prolong the time of boiling eggs, and it is not easy to grasp the age and tenderness of good eggs. Practice has proved that boiled eggs are most suitable over medium heat.

3. Time. After determining the amount of firepower, as long as you accurately grasp the time of boiling eggs, you can control the age and tenderness of the eggs as you like.

One is that it has been cooked for too long. The second is deterioration.

The smell of ammonia after the egg is cooked is caused by the deterioration of the eggHydrogen sulfide

If hard-boiled eggs have ammonia.

Smell, which may be caused by the deterioration of eggs after being stored for too long, the internal deterioration of eggs can produce hydrogen sulfide, which has a pungent taste and is similar to the smell of ammonia. Spoiled eggs have more bacteria and mould in them, which will affect your health, so you should avoid eating eggs with ammonia smell.

How to pick fresh eggs:

1. Eye identification: good quality fresh eggs, the eggshell is clean, complete and dull, and there is a layer of hoarfrost on the shell, and the color is distinct. Inferior fresh eggs, eggshell cracks, nests; Broken eggshell, spilled egg white, or mild mildew on the outside of the shell, etc.

2. Hand touch identification: that is, use your hands to find out whether the surface of the egg is rough, weigh the weight of the egg, and flip the egg on the palm of your hand. Good quality fresh eggs have rough shells and appropriate weight.

The eggshell of the slightly inferior egg is cracked, pitted or broken, and it feels smooth to the touch. More often than not, the shells of the fresh eggs are broken and the egg whites flow out. Inferior eggs are either too light or too heavy to weigh.

3. Ear identification: hold the egg in your hand and gently shake it to listen to its sound. The sound of good quality fresh eggs hitting each other is crisp, and the eggs shake silently.

Inferior fresh eggs make a mute sound when they collide with the eggs, and the contents have a sense of fluidity when the hand shakes. The worst eggs are usually hand-shaken with a swaying sound.

Boiled eggs smell fishy when they are boiled and peeled off, indicating that the eggs have been spoiled before they are boiled, that is, stinky eggs. If the egg is spoiled and foul-smelling due to bacterial invasion and multiplication, it will cause bacterial food poisoning.

Eggs also have a shelf life, if the eggs are stored for too long, bacteria invade through the eggshell, causing the eggs to deteriorate, with the extension of the storage time, the various nutrients contained in the eggs will be destroyed, the nutritional value will be reduced, the taste will become worse, and even become stinky. Spoiled eggs will cause harm to human health and are inedible, even if they are fried or boiled.

The eggs are not bad, but they have a smell, indicating that the eggs are starting to spoil.

There are many small pores on the eggshell like human sweat pores, and the surface of the eggshell often contains bacteria, mold and other microorganisms, when the external environmental temperature changes drastically, the eggshell has water condensation or mechanical damage, and the microorganisms enter the egg through the small holes on the shell.

As a result, the protein in the egg is rapidly decomposed to form hydrogen sulfide, amines, skatin and other putrid substances, which emit peculiar odor and form rotten eggs.

The egg itself has a fishy smell, if it is a boiled egg, it may be that the eggshell is not cleaned before boiling, if the taste is not very big, it is a normal phenomenon, and you can eat it with confidence. If it is a very strong fishy smell, the egg may have deteriorated, but the yolk has not dispersed, and it is not visible to the naked eye that it has deteriorated.

The eggs are not bad, but they smell good

Spoiled eggs generally have a foul smell, the yolk is loose when opened, or sticky to the shell, these eggs should not be eaten again, even if the smell can be weakened by frying or frying.

Eggs have an expiration date, do not store them for a long time, otherwise bacteria may invade the inside of the egg through the shell, causing the egg to spoil.

Rain-soaked eggs spoil easily and should be separated from other eggs and consumed as soon as possible.