How is the pine flower of the pine flower egg carved ?

Songhua eggs are also known as preserved eggs. When you knock off the outer layer of mud on the outside of the pine egg and peel off the shell, a layer of blue-brown, translucent egg whites is revealed。Take a closer look, is there still embedded in the protein?

The beautiful pine leaf-like crystalline pattern is called a pine flower. Songhua eggs also get their name.

It turns out that the pine flowers on the pine flower eggs are carved through a chemical reaction: the main chemical component of the egg white is a protein. When eggs are left out for a long time, some of the proteins in the egg whites will be broken down into amino acids.

The chemical structure of amino acids is interesting, it has an alkaline amino group and an acidic carboxyl group, therefore, it can act with both acidic and basic substances.

When people make Songhua eggs, they deliberately add some alkaline substances to the mud, such as lime, potassium carbonate, sodium carbonate, etc。They pass through the pores in the eggshell and run into the egg to combine with amino acids to produce amino acid salts. These amino acid salts are insoluble in proteins, so they crystallize in a certain geometric shape.

The beautiful pine flowers are the crystals of these amino salts.

In fact, the yolk of Songhua eggs is blue-black, which is also caused by a chemical change: the main chemical component of the yolk is another protein, which contains sulfur。Over time, the egg yolk will also break down into amino acids, and the smelly gas hydrogen sulfide (H2S) is released.

Egg yolk itself contains many minerals, such as iron, copper, zinc, manganese, etc., with which hydrogen sulfide can form sulfides. The yolk turns blue-black because of the sulfides. However, most of these sulfides are extremely difficult to dissolve in water, so they are not absorbed by the human body.

This is carved in a very unique way.

It is the natural reaction of some elements, so it can be carved.

This is actually a natural way to go up through some grasp of the heat.

When people make Songhua eggs, they will add some alkaline substances to the mud, so the pattern will appear.

On the eve of the production, some alkaline substances were added to the Songhua eggs, and the reason why this happened was also a chemical reaction.

Of course, it's artificially carved, because the knife skills of Chinese chefs are really awesome.

I think the pine flowers on the pine eggs are artificially carved.

Of course, the chef has carefully carved it with very exquisite craftsmanship, isn't it?

Songhua eggs produce "pine flowers", and "carving masters" are sodium hydroxide in the marinade. During the curing process, they pass through the pores in the eggshell and penetrate into the duck eggs to combine with amino acids to form amino acid salts. These amino acid salts are insoluble in proteins, resulting in crystallization.

These beautiful "pine flowers" are the crystals of amino acid salts, and the main ingredient of the "pine flowers" on the pine flower eggs is manganese hydroxide crystals.

In recent years, Songhua eggs have been controversial, with some people saying that their lead content is too high. Lead Dan is the main lead in traditional Songhua eggs, which is used to ensure that Songhua eggs do not appear to be coagulated and liquefied after maturity, and maintain color and taste for a long time. In the new "national standard" implemented on December 1, 2015, the traditional leaded processing technology was deleted, and the lead content of Songhua eggs was not more than milligrams, which is the same as the lead content of fish, meat and tofu that we eat daily.

Preserved eggs, also known as Songhua eggs, eggs, etc., are the egg processed foods invented by the Han people in China, and they are also a kind of food unique to China. Its main raw material is duck eggs, which are fresh and smooth in taste, slightly salty, and unique in color and flavor. Songhua eggs are not only loved by domestic consumers, but also enjoy a good reputation in the international market.

In fact, preserved eggs are the name of the southerners, and the north is called Songhua eggs, because the egg white cortex is formed by needle-like crystals, called pine flowers, especially high-quality products, which are more pine flowers. But how exactly is the pine flower formed? Some people think that it is the reaction of cypress branches, and the ash from the burning of pine branches into the egg, while others think that it is a skill"Clever hands out of pine flowers"In fact, this is a misunderstanding that the pine flower on the pine flower egg is actually a crystallization of amino acid salts, showing a certain geometric shape.

As the eggs sit for a long time, some of the proteins in the egg whites break down into amino acids. The chemical structure of amino acids has a basic amino-NH2 group and an acidic carboxyl-COOH group, so it can interact with both acidic and basic substances. When people make preserved eggs, they wrap a layer of special mud on the duck eggs, and the mud is mixed with alkaline substances such as lime, potassium carbonate, sodium carbonate, etc., and they will enter the inside of the duck eggs through the tiny holes in the eggshell, and react with amino acids to produce amino acid salts.

Amino acid salts are insoluble in egg whites, and they will crystallize in a certain geometric shape, which is the last snowflake-like pattern we see. For example, northerners like to cut preserved eggs into four or more pieces in the direction of the longitudinal axis, sprinkle with shredded ginger or minced ginger, and then sprinkle vinegar and salad to eat. Cantonese people are accustomed to chopping it and putting it in porridge, the most common being preserved egg and lean pork porridge.

The preserved egg tofu that Shanghainese like to make is minced with raw preserved eggs and tender tofu, and a little soy sauce and sesame oil are added. Taiwanese side dishes also have preserved egg tofu, the method is similar, the only difference is that some bonito flakes will be sprinkled with it, so that the taste will be more refreshing and delicious.

It is a crystallization of geometric shapes, and the texture is like a pine flower, so people name it Songhua egg.

There is also a very complex chemical reaction in the formation of pine flowers, after the egg is placed for a long time, the egg white will be broken down into amino acids, which have an alkaline amino NH2 and an acidic hydroxyl COOH, so he can act with both acidic and alkaline substances. Therefore, in the production process, people add lime, sodium carbonate and other substances, which will pass through the eggshell and interact with amino acids to form amino acid salts. These amino acid salts are insoluble in the protein, so they form crystals of a certain geometric shape, and they form beautiful pine flowers.

Peel off the egg whites inside the Songhua egg, there are some cracks like snowflakes and like sending flowers, so it is called Songhua eggs!

It is the "pine flower" on the surface of the preserved egg, which is the crystalline body of amino acid salts, and the main component of the "pine flower" on the pine flower egg is manganese hydroxide crystal.

The formation of the pine egg pattern is due to the chemical reaction of the product during the pickling process, and the pattern resembles snowflake crystals.

The pattern in the shape of an egg resembles a flower?!!

How is the "pine flower" of Songhua egg formed? Teach you to choose high-quality Songhua eggs! Have you ever eaten Songhua eggs?

Before I ate Songhua Eggs, I had a lot of associations with Songhua Eggs, I had heard of Songhua Eggs since I was very young, and I have always associated it with Songhua River, and I didn't know how ignorant I was when I grew up. The reason why Songhua eggs are called this name is because the pickled Songhua eggs have white pine needle-like crystals or patterns on the surface, so they are named Songhua eggs.

If you have ever eaten Songhua eggs, you should know that Songhua eggs are made from duck eggs, and then made with traditional craftsmanship in our China, and there is also a kind called changing eggs, and changing eggs are made from ordinary eggs. So why does pine flower tweed appear on the pine flower egg, and how it is formed, and share it with you. In fact, the formation of pine flowers is very simple, that is, the sodium hydroxide in the marinade passes through the pores of the eggshell, and the amino acids in the duck eggs form amino acid salts, these components are insoluble in the protein, so it becomes a crystal on the egg white, and the beautiful pine flower is actually the crystallization of amino acid salts.

Songhua eggs are delicious, but there is lead, how should we choose when buying? There are a lot of lead-free preserved eggs on the market now, and we will share with you how to choose them. The traditional way to make preserved eggs is to coat them with a layer of mud and sawdust, but nowadays most people use the soaking method without mud.

The soaking method is divided into multiple process schools, and there is no inevitable connection between whether Songhua eggs have lead or not and the production process, so there is no way to choose depending on the process.

Some people say that it should be looked at the black dots on it, and the black dots with few black dots do not contain lead, so is this the case? The traditional production of Songhua eggs are made of lead, lead is the main lead in the traditional Songhua eggs, and now the country has introduced a new national standard for Songhua eggs, stipulating that the lead content of Songhua eggs is not more than milligrams of kilograms, so we have not used lead Dan, with copper sulfate, zinc sulfate and other metal salts.

Although lead can cause black spots on the surface of the eggshell, copper sulfate can still cause black spots on the eggshell, and Songhua eggs marinated with zinc sulfate and other protein coagulants can make the black spots less or none, so the lead content of those without black spots is usually low, but those with black spots may not contain more lead.

1. Choose duck eggs instead of eggs.

The small size of the egg is not suitable for making preserved eggs, if the preserved eggs that have been marinated for a long time are used as raw materials, some people may eat them in two bites, and the preserved eggs made of eggs are golden brown, which always looks like raw, and the taste is not as fragrant as that made of duck eggs.

2. The time to marinate the preserved eggs.

How Songhua eggs are made.

If it is cooler in spring and autumn, the sealed storage time is 20-25 days, which is longer, and in the summer, the temperature is relatively high, and the pickling and fermentation speed will be accelerated, generally in 10-15 days, and it is appropriate to be in 30 days when it is cold in winter.

3. Take out the ventilation and remove the fire.

How Songhua eggs are made.

After the pickled preserved eggs are taken out, they are first exposed to the air for ventilation and alkalinization, and are generally placed outdoors to dry for 4-5 days before eating.

When we eat preserved eggs, if we look closely, we will find that the preserved eggs are covered with pine flowers, so how are these pine flowers formed? Why do preserved eggs form pine flowers? But some preserved eggs don't have these patterns, can you eat preserved eggs with patterns?

1. Causes.

Eggs are made up of egg whites and yolks, and the main components that make up egg whites are proteins. In the process of making preserved eggs, it is necessary to soak in alkaline substances, in this process, the protein will be decomposed into amino acids, and the amino acids can react with alkaline substances to form amino acid salts, which are insoluble in the egg white, so they will crystallize out in a certain geometric shape, that is, the pine flowers on the preserved eggs are formed, so the preserved eggs are also called pine eggs.

2. Pine flowers are edible.

Preserved eggs with pine flowers are edible, because pine flowers are produced during the production process, which is an amino acid salt and will not cause any harm to the body. But it also leads to the alkalinity of preserved eggs, so preserved eggs should not be eaten too much. If you add some vinegar when eating preserved eggs, it can not only play a sterilizing role, but also neutralize part of the alkalinity of preserved eggs, so that the preserved eggs taste better.

3. Warm reminder.

Preserved eggs should not be eaten more, not only because the alkalinity of preserved eggs is too large, but also because preserved eggs contain a certain amount of lead, and if you eat too much lead, it is easy to cause poisoning, so preserved eggs should not be eaten more. Even lead-free preserved eggs contain a small amount of lead. If children eat preserved eggs, lead is easy to remain in children's liver, lungs, kidneys and other tissues and red blood cells, and it is easy to cause the loss of calcium in the bones and teeth in the child's body, which will eventually affect the development of the child, so the child needs to eat less preserved eggs.

The main component of protein is a type of protein that breaks down into amino acids when left for a long time. The chemical structure of amino acids has an alkaline amino group and an acidic carboxyl group, therefore, it can act with both acidic and basic substances.

The strong alkali (Naoh, KOH) in the ash material penetrates into the egg white and egg yolk through the fine pores on the eggshell, and reacts with the protein in it, causing the protein to decompose and solidify and release a small amount of hydrogen sulfide (H2S) gas.

At the same time, the infiltrated alkali will further neutralize the amino acids decomposed by the protein, and the crystals of the resulting salt will be deposited in the preserved egg white of the gel peptide, and white "pine flowers" will appear. These beautiful pine flowers are the crystals of these metal salts.

Hydrogen sulfide gas reacts with the minerals in the egg white and egg yolk to form various sulfides, so the color of the egg white and egg yolk changes, the egg white is a special brown color, and the egg yolk is dark green.

Salt can shrink the preserved eggs and increase the taste.

The tannins and aromatic oils in tea can color the coagulated proteins and add flavor to the preserved eggs.

In the process of making preserved eggs, it is necessary to soak in alkaline substances, in this process, the protein will be decomposed into amino acids, and the amino acids can react with alkaline substances to form amino acid salts, which are insoluble in the egg white, so they will crystallize out in a certain geometric shape, that is, the pine flowers on the preserved eggs are formed, so the preserved eggs are also called pine eggs.

The main component of pine flowers on pine flower eggs is Mg(OH) crystals. The main reason for the production of pine flowers in Songhua eggs is the NAOH in the pickling liquid, and the formation principle is as follows: quicklime, soda ash, plant ash, salt, water, and tea are used as pickling preparations in the traditional pickling method of Songhua eggs; In modern industrial curing methods, industrial raw materials are generally used directly

NaOH), table salt (NaCl), quicklime (CAO), *copper (CuSO·5HO), *zinc (ZNSO·7HO) and ***ferrous iron (Feso·7HO), tea. The pickled preparation contains a large amount of NaOH, when enough NaOH is entered into the Songhua egg, the sol-forming protein in the original egg becomes a gel state due to the action of alkali, and the Songhua is generated between the interlayer gaps of each layer of protein gel, so the magnesium ions that form Songhua are mainly present in the sol protein, and the segregation is combined with -OH to form Mg(OH) hydrate during gelation, and accumulates between the interlayer gaps of each layer of protein gel to form pine flowers. The ** of Mg2+ is the eggshell and egg membrane.

As early as 1988, Li Shuqing et al. studied the composition of pine flowers in pine eggs as mg (OH).