A chicken egg is a unique product created by nature itself with ideal protection, but it is this protection that becomes vulnerable if used incorrectly. Many housewives and owners don’t even think that the standard shelf in the refrigerator door, where we are all used to putting trays, is one of the worst places for long-term storage of this product. Temperature fluctuations that occur each time the door is opened can shorten the shelf life and deteriorate the taste of the contents.
In this article we will analyze the physics of the storage process, the effect of temperature on the structure of the white and yolk, as well as debunk myths about washing the shell before storing. You will learn why it temperature conditions is more important than it seems at first glance, and how to organize the space of the refrigerator compartment so that food remains fresh for as long as possible. Understanding these processes will help you avoid food poisoning and maintain nutritional value.
It is also necessary to take into account that the rules may differ for store-bought packaging and farm eggs collected in person. On an industrial scale, surface treatment is often used to create a protective film, while homemade products require a more delicate approach. It is critically important to know that at temperatures above +20°C an egg “ages” in a day the same way as in a week in the refrigerator.
The influence of temperature on the safety of the product
Temperature is the main factor determining the rate of deterioration of any biological material. For chicken eggs, the optimal range is considered to be from +2 to +4 degrees Celsius. It is at these indicators that the biochemical processes inside the protein and yolk slow down, preventing the development of pathogenic microflora, in particular salmonella.
If you place the tray in an area where the temperature is higher than recommended, for example, on the top shelf next to the freezer or in the door, where the climate constantly changes, the shelf life is reduced significantly. Sharp changes in temperature lead to the formation of condensation inside the shell, which facilitates the penetration of bacteria through the pores. Stability of cold is more important than its absolute value in the short term.
However, you should not overdo it with cooling. Freezing a raw egg in its shell will cause the liquid inside to expand and rupture the hard shell. This will not only spoil the appearance, but also make the product unsuitable for consumption due to disruption of the protein structure. Therefore, storage in the freezer is possible only in a special form, which will be discussed below.
⚠️ Attention: Never store eggs next to products that have a strong odor (fish, smoked meats, spices), since the shell has a porous structure and easily absorbs foreign aromas, which will change the taste of the dish.
Modern refrigerators often equipped with electronic controls that allow you to set precise values. It is recommended to use a thermometer to check the actual temperature in different zones of the chamber, since the sensor readings on the panel may differ from the actual values at the wall or on the middle shelf.
Correct location in the refrigerator compartment
Choosing a location for the tray is a strategic task. As already mentioned, the refrigerator door is a temperature swing area. Each time the door opens, a stream of warm air is released, which heats the surface of the eggs, and when closed, they cool again. Such cycles are extremely undesirable for maintaining freshness.
The ideal place is the middle or lower shelf of the main compartment, closer to the back wall, but not close to it, to prevent freezing. Here the temperature background is most stable. If your refrigerator has a special zone Fresh Zone or compartment for vegetables and fruits, make sure that the temperature there is not too low for eggs, although it is usually quite suitable.
- 🥚 Use the original cardboard packaging - it protects from foreign odors and prevents moisture absorption.
- 🧊 Place the pointy end down - in This part contains an air sac, and this position helps the yolk remain centered.
- 🚫 Avoid proximity to meat or raw fish to avoid cross-bacterial contamination.
Some refrigerator models have built-in holders in the door. If you plan to use the product within 3-5 days, this is acceptable. For a long-term supply, it is better to move the purchase to the back of the refrigerator. It is also important that the eggs do not touch each other without protection if they are simply laid out on a shelf, although this is usually provided structurally in trays.
Do you need to wash eggs before storing
This question causes the most controversy among culinary specialists and microbiologists. On the one hand, there may be traces of droppings or feathers on the shell, which looks unhygienic. On the other hand, when produced in poultry farms, eggs are often processed and covered with a thin protective layer that seals the pores and prevents bacteria from penetrating inside.
If you wash off this layer with water, especially warm water, the protective barrier will be destroyed and the shelf life will be sharply reduced. Water can drive bacteria deeper into pores due to osmotic pressure. Therefore, washing store-bought eggs before putting them in the refrigerator is strictly not recommended.
Another thing is eggs from familiar farmers or from your own backyard. They are often contaminated with organic matter. In this case, washing is necessary, but this should be done immediately before cooking, and not before storage. Use warm water and a brush if the dirt is strong, but remember that after washing, such eggs should be consumed first.
To disinfect the surface before long-term storage, some experts recommend wiping the shell a weak solution of vinegar or vegetable oil, but these are rather measures for conditions where there is no refrigerator. In a modern kitchen, it is enough just to keep them dry and clean.
Shelf life: raw, boiled and broken
The time during which the product remains safe and tasty directly depends on its condition and processing. A raw egg in the shell, subject to a temperature of +2...+4°C, can be stored for up to 90 days (about 3 months) from the date of laying. However, they are considered dietary only for the first 7-9 days, after which they move into the canteen category.
Boiled eggs have a much smaller resource. If you hard boil them and don't peel them, they will last about a week in the refrigerator. A peeled boiled egg should be eaten within 2-3 days, since without a shell it quickly dries out and absorbs odors. Eggs “in a bag” or soft-boiled are stored for no more than 2 days due to the liquid center, which is an excellent environment for bacteria.
| Product type | Storage conditions | Maximum period |
|---|---|---|
| Raw (in shell) | Refrigerator (+2...+4°C) | 90 days |
| Hard-boiled (in shell) | Refrigerator | 7 days |
| Boiled (peeled) | Closed container | 2-3 days |
| Broken (raw) | Closed container | 2 days |
If you break an egg and do not use it completely, pour the remainder into a clean, dry container with a tight-fitting lid. Do not store the raw contents in an open bowl, even in the refrigerator - it will quickly weather and lose its properties. For white and yolk, the timing may be slightly different, but the general rule is no more than 48 hours.
Checking freshness at home
How to determine if an egg has gone bad if you forgot when you bought it? There is a simple and reliable physical test based on changing the size of the air sac inside. Over time, moisture evaporates through the pores, and the air chamber increases, changing the buoyancy of the object.
Take a transparent container, pour cold water into it and lower the egg into it. If it lies horizontally on the bottom, the product is absolutely fresh, you can even eat it raw. If the blunt end floats up and the egg stands vertically at the bottom, it is already several weeks old, it is suitable for hard boiling or baking, but not for fried eggs.
- 🌊 If it has completely floated to the surface, the product is spoiled and must be thrown away.
- 👃 An unpleasant odor when broken is a sign of hydrogen sulfide, such an egg is dangerous for health.
- 👀 Spready whites and flat yolks are a sign of old age, use only after heat treatment.
You can also use the transillumination method (ovoscopy). Point the light source at the blunt end of the egg. If the air chamber does not exceed 9 mm and the yolk is not visible as a dark spot (it has not stuck to the wall), the product is suitable. The presence of blood spots inside does not always indicate spoilage, often it is simply a burst vessel during laying, but it is better to fry such an egg thoroughly.
What to do if the egg smells slightly of sulfur?
If the smell is barely perceptible, try breaking the egg into a separate bowl. If the smell intensifies and resembles rotten meat, throw it away. If the smell disappears after a minute, most likely this is a reaction of the protein, and the product can be used for baking with strong flavors (cinnamon, vanilla).
Is it possible to freeze chicken eggs
Freezing whole eggs in the shell is prohibited - the liquid will expand when frozen and break the shell, and the texture of the protein after defrosting will become rubbery and unsuitable for food. However, if you have excess product, it can be frozen as a mixture or separately.
To do this, break the eggs, lightly beat the white and yolk until smooth (you can add a pinch of salt or sugar to prevent crystallization, depending on further use) and pour into ice cube trays or containers. In this form, at a temperature of -18°C, the product can be stored for up to 10-12 months.
This product should be defrosted slowly, in the refrigerator, and used exclusively for heat treatment (omelettes, pancakes, pastries). Thawed eggs cannot be eaten raw. This is a great way to save the harvest from poultry or take advantage of a promotion in the store.
☑️ Check before storing
How to distinguish dietary egg from a table?
A dietary egg is considered to be in the first 7 days after laying. The stamp usually bears the letter “D” or a date that is not more than a week away from the current one. Table eggs can be stored for up to 25 days at room temperature and up to 90 days in the refrigerator. Dietary ones have a denser white and a tall, elastic yolk.
Why does the yolk move to the edge?
This is a sign of aging. Gradulins (the ligaments that hold the yolk in the center) weaken and break down over time. If the yolk sticks to the inner wall of the shell, such an egg has already begun to deteriorate, even if there is no smell of rot yet.
Is the green coating on the yolk of a boiled egg dangerous?
No, this is not a sign of spoilage. The gray-green color occurs when eggs are digested when iron from the yolk reacts with sulfur from the white to form iron sulfide. This is safe, but may indicate that the egg is overcooked and may be a bit harsh.
Can eggs be stored at room temperature?
In the CIS countries, eggs are often not washed before sale, maintaining a protective layer, so they can be stored at room temperature for up to 25 days. In the USA and Europe, eggs are washed, destroying the protection, so they can only be stored in the refrigerator. If you washed the egg - only cold.
What do the markings C0, C1, C2 mean?
These are categories indicating the weight of one egg. C0 (select) - 65-74.9 g, C1 (first category) - 55-64.9 g, C2 (second) - 45-54.9 g. The category does not affect the shelf life, only the size and, indirectly, the price.