How to tell whether an egg is good or bad?

1, see if the yolk is full, bulging and tough.

Fresh egg yolk will be full, convex and resilient when it is hit on a plate or bowl; The stale yolk is scattered and the height is flush with the egg white. There is a layer of yolk film between egg yolk and egg white, which has certain elasticity. With the extension of storage time, the elasticity of egg yolk membrane will weaken or even break, so the egg yolk will be scattered.

2. See if the egg white is shaped.

Fresh protein will be round or oval, while stale protein has no shape. Egg white is a sticky gelatinous substance. With the extension of storage time, under the action of protease, mucin in egg white will gradually dehydrate, and protein will gradually become thinner without forming.

3. See if the egg white is layered.

After fresh eggs are opened, there will be a clear layer of egg white, which is divided into three layers, namely, outer thin egg white, middle thick egg white and inner thin egg white, with a film in the middle. With the extension of storage time, the PH value of egg white gradually increased, and the thick part of egg white gradually became thinner, and the stratification was not obvious.

4. See if there are shoelaces on both sides of the egg yolk.

Fresh egg yolk will have two spiral white laces on both sides of the blunt end and the sharp end, which will fix the egg yolk in the inner layer of thin egg white and thick egg white like two small tails. With the extension of storage time, the lace will gradually disappear and the yolk will stay away from the middle.

Extended data:

The correct way to store eggs:

First, choose broken or damaged eggs. For intact eggs, gently wipe off the dirt on the eggshell surface with a clean cloth or paper.

Then, put the eggs in the refrigerator, head down and head up. In spring and autumn, you can spread some sawdust, sawdust, fine sand, rice bran and rice in the container for storing eggs, and put the eggs upside down vertically and store them in a cool place.

Eggs can be stored in the refrigerator for up to 40 days, usually at room temperature 10~ 15 days. Too long storage time will not only affect the freshness and nutritional components of eggs, but also deteriorate due to the invasion of bacteria, resulting in shell sticking and yellowing.

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