Fresh food will go bad if left at room temperature for a long time. This kind of corruption will inform people through dark spots, mildew spots and other forms, and smell is also a signal transmission. For example, if food is destroyed by mold, it will have an unpleasant musty smell, fish rot will have a choking rancid smell, and fruits and vegetables will have a disgusting sour taste when they are broken. Similarly, when the oil is broken, it also has a representative bad taste-hala taste. Bad oil is not simply not delicious. Deteriorated cooking oil can make people sick and even poisoned.
The rancidity of edible oil in food will be affected by many factors, such as fatty acid saturation, sunlight, moisture and so on. Under the action of light, heat and bacteria, fat is first decomposed into glycerol and fatty acids, and fatty acids are further decomposed into ketones and ketoacids. Polyunsaturated fatty acids can form peroxides and further decompose into aldehydes and ketoacids. Carboxyl compounds such as aldehydes and ketones can make rancid oil "spicy".
Extended data:
Storage method of edible oil:
1. Storage conditions before opening: If the purchased edible oil cannot be eaten as soon as possible, pay attention to the storage conditions when storing. During storage, light, heat, oxygen, water and metal ions will all affect the oxidative rancidity of oil. Therefore, in order to prolong the shelf life of oil, we should try our best to choose dark, cool, sealed and dry conditions.
2. Storage conditions after opening: The edible oil should be kept away from the stove to avoid accelerated oxidative rancidity at high temperature. It can be stored in a dark kitchen locker.
3. Choose a suitable storage container: metal ions can promote the oxidation of edible oil. When choosing an oil control pot for packaging edible oil, it is best to use a clean small bottle made of brown glass bottle with dry inside.
People's Daily Online-Cooking oil has a "pungent taste" for a long time. The thrifty citizens feel sick after eating it.
China Quality News Network-The "True" Shelf Life of Edible Oil