1. Loose yolk eggs: Due to violent vibrations such as transportation, the yolk membrane ruptures, causing mechanical loose yolk; or if stored for too long, bacteria or mold invade the egg through the pores of the eggshell, destroying the protein structure and causing loose yolk. The liquid is thin and turbid. If the yellowing is not serious and there is no peculiar smell, it can still be eaten after high-temperature treatment such as boiling. However, if bacteria multiply in the egg and the protein has been denatured, it cannot be eaten if there is a smell.
Cracked Egg
2. Cracked eggs: During the transportation, storage and packaging of eggs, due to vibration, extrusion and other reasons, some eggs will cause cracks and cracks, which are easily invaded by bacteria. If they are left for a long time, they are not suitable for consumption.
3. Stillborn eggs: Eggs that are contaminated by bacteria or parasites during the incubation process, coupled with poor temperature and humidity conditions, cause the embryo to stop developing are called stillborn eggs. The nutrients contained in such eggs have changed. If they die for a long time, the protein will be decomposed and a variety of toxic substances will be produced, so they should not be eaten.
4. Moldy eggs. If some eggs are exposed to rain or moisture, the protective film on the surface of the eggshell will be washed away, allowing bacteria to invade the egg and cause mold and deterioration, resulting in black spots on the eggshell and mold. Such eggs should not be purchased. edible. In addition, there is diarrhea
5. Rotten eggs: Bacteria invade the eggs and multiply in large numbers, resulting in deterioration, the eggshells are dark gray, and even the eggshells are ruptured due to the expansion of hydrogen sulfide gas inside the eggs, and the mixture inside the eggs is gray-green or dark yellow, with odors. If there is a foul smell, the egg cannot be eaten, otherwise it will cause bacterial food poisoning. Eggs, blood-gluten eggs, etc. should generally not be purchased for consumption.