1. Proteins are broken down into amino acids. The chemical structure of amino acid has a basic amino group-NH2 and an acidic carboxyl group-COOH, so it can react with acidic and alkaline substances.
2. Some added alkaline substances, such as lime, potassium carbonate, sodium carbonate, etc. , react chemically with amino acids to produce amino acid salts.
3. Amino acid salts are insoluble in proteins, so they crystallize into certain geometric shapes, forming beautiful pine flowers.
4. Amino acid decomposition reaction produces ammonia gas.
Extended data
Contraindications and side effects
Infants and young children, spleen yang deficiency, cold and damp diarrhea patients, cardiovascular disease, liver and kidney disease patients eat less.
Many people know that eggs contain lead, so they buy lead-free eggs so that they can eat without fear. In fact, lead-free eggs also contain lead, which is fine for adults. For the sake of children, it is better to eat less.
When processing leather eggs, mix soda ash, lime, salt, and yellow dan powder in a certain proportion, and then wrap duck eggs with mud and chaff. After two weeks, the delicious skin eggs are ready. Yellow dan powder is lead oxide, which gives the eggs a beautiful pattern, but with yellow dan powder, the skin eggs are contaminated with lead.
According to national regulations, the lead content in every 1,000 grams of skin eggs should not exceed 3 milligrams. Eggs that meet this standard are also called lead-free eggs. So "lead-free eggs" do not mean no lead, but lead content is lower than the national standard.
Chinese medicine believes that children's bodies are characterized by "juvenile yin and juvenile yang", and their metabolism is abnormally strong. The trace lead in the "lead-free" eggs is absorbed by the children, will remain in the liver, lungs, kidneys, brain and other tissues and red blood cells, but also cause the loss of calcium in the bones and teeth. Regular consumption of "lead-free" eggs can cause bone and dental dysplasia, anorexia and gastroenteritis. In children, it also affects their intellectual development.
Lead-free eggs are tasty and nutritious, but children are in a period of vigorous development, and the harmful reaction to lead is obvious. It's better to eat less.
On hot summer days, most people like to drink leather egg beer or serve the whole family with cold leather eggs. It may never occur to them that skinny eggs can also cause food poisoning.
According to the examination and analysis of food experts, there are only 400-500 bacteria on the shell of a clean skinned egg, while there are as many as 140-400 million bacteria on the shell of a dirty skinned egg. If a large number of these bacteria enter the egg through the pores of the shell, eating such eggs will be poisoned.
Buying eggs should be noted that the skin eggs peeled, the protein is dark brown transparent body, with a certain toughness; contaminated eggs are light green, poor toughness, easy to loosen. Such skin eggs must not eat.
Salmonella is the main bacteria contaminating the eggs, it enters the body with the eggs to cause inflammation of the mesentery. Bacterial fission produces highly toxic endotoxin, leading to symptoms of poisoning in humans.
Experiments have shown that Salmonella will die immediately at 100 degrees Celsius, 5 minutes after 70 degrees Celsius and 15-30 minutes after 60 degrees Celsius. Therefore, in the consumption of suspicious skin eggs, can be shelled eggs steamed at high temperature for about 5 minutes, after cooling can be safely eaten.
The suitable temperature for the growth of salmonella is 20℃-37℃, and the temperature in summer and fall is just within this range, so people should pay special attention to prevent poisoning of leather eggs.
Compared with duck eggs, loose eggs contain more minerals, but fat and total calories are slightly lower. It can stimulate the digestive organs, increase appetite, promote digestion and absorption of nutrients, neutralize stomach acid, cool and lower blood pressure. It has the effect of moistening the lungs and nourishing yin, stopping bleeding, cooling the intestines, stopping diarrhea and lowering blood pressure. In addition, the skin egg has the role of protecting blood vessels.