, the Red New Year decorations in Town God’s Temple, health care products packed in supermarkets, New Year gift boxes, crowded bus stops, and a hard train for spring transportation. Unknowingly, it brings people into the countdown to the Spring Festival in the year of the snake in 2013. Family “cook” women, in full swing, come up with the Spring Festival shopping list of food, from all kinds of candy, nuts, drinks to the new year’s Eve food ingredients, all in detail.
are the main shopkeepers and purchasers of the Spring Festival at home. My mother made a request this year, hoping to replace a large capacity refrigerator with a “opposite door” that can accommodate the rich ingredients of the Spring Festival. There may not be a small number of housewives who have this idea. How does refrigerator keep fresh? Careful friends of
may have found that some foods with low moisture content and high sugar / salt content can be stored for a long time even at room temperature, because the conditions of food itself inhibit microbial reproduction conditions and extend the shelf life. However, food deterioration is not only due to the breeding and reproduction of microorganisms, but also includes chemical changes in food, such as lipid oxidation, and the continuous degradation of nutrients by enzymes in food. Therefore, in order to extend the shelf life of food, we should not only control microorganisms, but also slow down the chemical reaction inside food. Temperature control is a way to kill two birds with one stone. The internal chemical reaction of food needs the catalysis of enzymes. The activity of enzymes is determined by the temperature (the temperature between room temperature and body temperature). The optimal temperature for the growth of microorganisms is generally 20-40 ℃. It can be seen that as long as [low temperature] can achieve the effect of killing two birds with one stone. This is the principle of refrigerator preservation! Refrigerator = locker = safe? Is there enough refrigerator in your house? Many friends of
think that once the food enters the refrigerator, it is like entering the safe, which can ensure that the food will not deteriorate, extend the shelf life and keep the fresh taste of the food. What about the facts?
some foods can extend the shelf life under the refrigeration or freezing environment of the refrigerator, such as most fruits and vegetables;
some foods stored in the refrigerator not only reduce the edible quality, but also shorten the “life span”, such as steamed bread, cucumber, mangguo;
some foods can be preserved for a long time without refrigeration, such as honey and pickled vegetables.
will undoubtedly take up space if the latter two are put into the refrigerator, and the waste of electric energy may not be flattering. It is precisely because of this that the refrigerator is “not enough”. During the Spring Festival, when the temperature is the lowest in all seasons of the year, the outdoor temperature in some areas is estimated to be colder than that of the refrigerator. Why not use this time? Reduce the burden on the refrigerator? The common function rooms of refrigerators can be divided into two types: refrigeration and freezing. When the temperature of freezing room is lower than 0 ℃, it can freeze food juice and preserve food for a long time, such as all kinds of meat and quick-frozen food. The lower the temperature in the freezer, the longer the food is stored. Now the temperature of the freezer can reach – 18 ℃, at which time the vitamin loss of food will be slowed down. The temperature of cold storage room is generally between 0-10 ℃, which can be used to store vegetables, fruits, leftovers and dairy products. Some refrigerators also have [ice temperature preservation room] the temperature is 0 ℃, which can not only keep fresh but not freeze food, can store fresh meat, fish, shrimp, shellfish and dairy products, but also serve as a thawing room.
4, “uneven heat and cold”? The correct storage pattern of
in the refrigerator’s multiple functional rooms is the refrigeration room, where fish, shrimp, meat and eggs, fruits and vegetables, snacks and milk can be settled here. As we mentioned above, the temperature of the refrigerator is between 0 ℃ and 10 ℃. In the largest storage space of this refrigerator, the temperature is not the same everywhere. The temperature difference of 2-3 ℃ can be achieved in different space positions. Therefore, in the same refrigerated room, in order to achieve the best refrigeration effect, different food places are also different. The temperature of the bottom, inside and both sides of the cold storage room is the lowest, which can store meat, beans and their products; the upper space and the storage compartment close to the door have the highest temperature, which is suitable for storing eggs and filling drinks. In the middle part, the temperature is moderate 4-5 ℃, which can be used to store vegetables, fruits and leftovers. In the storage process, we should pay attention to:
1, raw and cooked food should not be mixed;
2. Raw meat should be packaged with fresh-keeping bags;
3. The cold storage room should not be filled too much, affecting the cold air circulation;
4. Vegetables and fruits should be put into the special fresh-keeping drawer