如何測試雞蛋是否新鮮？

Eggs are high in protein and rich in nutrients. The most commonly used food in the cooking process, whether eggs need to be cleaned, is a concern of many people. Unwashed eggs can have many hazards.

本地的雞蛋規定

Many countries have clear regulations. The U.S. government stipulates that eggs sold in supermarkets must be washed; eggs are sold under refrigeration to extend the “fresh period” of eggs. This kind of regulation exists in many countries and has become a trend. Therefore, it is necessary to purchase an 蛋洗機 to operate the egg industry, as well as other supporting equipment, egg grader, and egg inkjet printers.

如何測試雞蛋是否新鮮？

Type one： The bigger the spread and the more irregular the edges, the more stale the egg will be. Normally, there will be a thin film between the egg yolk and the egg white, which is called “yolk film” professionally. As the storage time becomes longer, the elasticity of the egg yolk film will become smaller and smaller, or even rupture.

蛋黃會融合在一起。更直觀的結果是，當雞蛋被敲開時，蛋黃會立即散開，沒有“包裹”的感覺，非常隨意。

Type two: Look at the size of the air chamber, the larger the air chamber, the less fresh the eggs will be. Where is the air chamber? When peeling eggs, you often see a dent on the side of the big end of the egg, right? That is the “air chamber” of the egg. From the moment the egg is born, its weight begins to change, generally becoming lighter and lighter.

這是因為蛋殼上有孔隙，會讓雞蛋內的水分持續蒸發，導致雞蛋的重量逐漸減少。是的，雞蛋在離開母雞身體後仍然是呼吸的蛋！但呼吸越久，水分越少，新鮮度也越低。

新鮮雞蛋的空氣室不超過3毫米。如果你的雞蛋空氣室明顯大於這個尺寸，則新鮮度較低。當然，不當的存放溫度和濕度也會加速雞蛋的失重。

如何妥善保存雞蛋？

雞蛋容易受到各種物質的污染，我們該如何妥善保存雞蛋，以便安全食用？

1. 不要冷凍

冷凍會改變蛋白質，導致蛋黃凝固，甚至可能裂開蛋殼。

2. 不要混放

存放的雞蛋殼上有許多致病菌和污垢，不要直接購買後放入冰箱，否則會引起交叉感染。

3. 不要側放

放置雞蛋時，注意大端，即有空氣室的那一端，這樣可以延長保存時間，並防止蛋黃在接近蛋殼時變成黃色。

最後，需要注意的是，雞蛋不能無限期存放。一般來說，存放1到2週的雞蛋是沒問題的，最長不應超過1個月。否則，不僅營養會大量流失，還會變成“壞蛋”。