What harmful substances are contained in preserved eggs?

1, lead: preserved eggs will contain a certain amount of lead in the production. If you take too much lead, it will lead to mental decline, damage the development of the nervous system, cause abnormal hearing, decline in learning ability and other phenomena, especially children's ability to expel lead is far lower than that of adults, so it is more harmful.

2. Sulfur: The main chemical component of preserved eggs is another kind of protein, which contains sulfur. After a long time, egg yolk will also be decomposed into amino acids: and hydrogen sulfide with the smell of rotten eggs will be released. Egg yolk itself contains many minerals, such as iron, copper, zinc and manganese. Hydrogen sulfide can react with these minerals to form sulfide.

3. Amino acids: A lot of protein in preserved egg yolk is decomposed into amino acids, so the yolk of preserved egg tastes much fresher than ordinary eggs.