Traditional Culture Encyclopedia - Photography and portraiture - What foods should not be stored in the refrigerator?
What foods should not be stored in the refrigerator?
Fresh eggs: refrigerated for 30~60 days
Cooked eggs: refrigerated for 6-7 days.
Milk: Refrigerate for 5~6 days.
Yogurt: refrigerated for 7~ 10 days.
Fish: refrigerated 1~2 days, frozen 90~ 180 days.
Beef: refrigerated 1~2 days, frozen for 90 days.
Steak: refrigerated for 2-3 days and frozen for 270 days.
Sausage: refrigerated for 9 days and frozen for 60 days.
Chicken: Refrigerate for 2-3 days and freeze for 360 days.
Canned: Refrigerate for 360 days without opening cans.
Peanut butter and sesame paste: opened and refrigerated for 90 days.
Coffee: opened and refrigerated 14 days.
Apple: refrigerated for 7~ 12 days.
Citrus: refrigerated for 7 days
Pear: refrigerated 1~2 days.
Cooked tomatoes: refrigerated 12 days.
Spinach: Refrigerate for 3~5 days.
Carrots and celery: refrigerated for 7~ 14 days.
Try to cook proper meals every day, and it is best not to eat overnight meals. If possible, close the refrigerator once a week and deice, clean, sterilize and disinfect the interior. When storing food, make sure that raw and cooked food is separated from vegetarian food.
Pig liver can't be put in the refrigerator, let alone overnight, which is even worse for the baby. If it's just for the baby, buy less pork liver. If it's too much, let's eat together. Neither expensive nor cheap. Some things will be fresh unless they are put in the refrigerator. For ordinary refrigerators, the temperature of the freezer is above zero, which can't keep animal meat fresh, while the temperature of the freezer is as low as-14 degrees. Therefore, the refrigerator has developed a three-temperature zone, and a drawer has been added to the cold room. The temperature inside is-1 degree, which is specially used to store fish (after removing the scales of internal organs) and pig liver, which are not suitable for deep freezing and need fresh food below zero. This technique is also called zero-degree preservation. Three-door refrigerators are popular now, and the middle door is a space where the temperature can be continuously adjusted from 10 degrees to -24 degrees. It is not only suitable for the preservation of fish and seafood, but also can expand the refrigeration space. For storing fish, the three-door refrigerator is the most suitable, while the ordinary refrigerator is very embarrassing.
Generally, there are 0, 1, 2, 3, 4, 5, 6 and 7 levels of temperature control knobs for refrigerators. The larger the number, the lower the temperature of the freezer. Generally, we put it in the third gear in spring and autumn, depending on your requirements, whether the freezer can reach below MINUS 18 degrees. To keep food fresh and save electricity, you can call 1 or 2 in summer and 4 or 5 in winter.
How to set the refrigerator temperature, taking the direct cooling mechanical thermostat as an example;
1, thermostat knob scale is 0-7, 0 means shutdown, 7 means strong cold, and 0-6 means increasingly cold.
2. The freezer temperature range is -4~-24 degrees (three-star-18 degrees, four-star -24 degrees), and the freezer temperature range is 5~ 15 degrees.
3. When adjusting the mechanical thermostat, the freezing room temperature and the refrigerating room temperature change at the same time.
Refrigerator is a tool to keep food fresh. Different foods need different storage temperatures, so the temperature of the refrigerator should be set according to the types of foods stored. For example, green leafy vegetables 12 degree, tropical fruits 10 degree, cooked food 8 degree, beer and beverage 4 degree, fresh meat-18 degree, fish and shrimp 0 degree, etc. In principle, it has nothing to do with the season.
When the temperature exceeds 30 degrees in summer, it exceeds the design capacity of the refrigerator. Turn up the temperature a little to prevent the refrigerator from freezing seriously without stopping the compressor. This is a sacrifice of function to ensure the normal use of the refrigerator.
Some people may ask, is it wrong to have a low temperature in winter (a large thermostat) and a high temperature in summer (a small thermostat)? In fact, many people have a misunderstanding that the low temperature in winter can raise the refrigerator temperature, and the high temperature in summer should be lowered.
Because the temperature of the freezer is controlled by the temperature of the storage room, look at your temperature control knob in the storage room. The temperature of the storage room is usually 4 ~ 8 degrees. The indoor temperature is close to this temperature in winter. If the thermostat knob is still at 3 or less, the refrigerator compressor is rarely started. Although the temperature of the storage room can meet the requirements, the temperature of the freezing room can not reach below-18 degrees, and the food is easy to deteriorate. In severe cases, food is thawed and melted. In summer, the temperature is higher. If the thermostat knob is still at 3 or above, the refrigerator storage room frequently starts the compressor to meet the temperature requirements. Although the temperature of the freezer is below-18 degrees, it is not advisable to waste electric energy and shorten the service life of the refrigerator. Therefore, adjusting the knob of the refrigerator thermostat correctly can keep us fresh and save electricity.
When storing food, it is best to wrap two layers with plastic wrap or use a sealed bag to prevent air from entering. Although there is a small compartment for storing eggs on the refrigerator door, it is best not to put eggs here. They should be packed in cardboard boxes first and then refrigerated. Do not wash fresh agricultural products before storage, put them in plastic bags that can breathe air, and it is best to eat them within a few days.
Some fruits are not suitable for cold storage, such as bananas. Potatoes and onions can be kept in a cool and dry place, and don't need to be kept in the refrigerator. Leftovers should be put in a sealed lunch box, boiled for two hours and then refrigerated, and eaten within 3-5 days.
Raw meat is wrapped in plastic bags and placed at the bottom of the refrigerator to prevent gravy from polluting other foods.
The surface of food stored in the refrigerator for a long time will crystallize, but it is safe to eat because no bacteria will survive in the freezer at MINUS several degrees. In addition, the nutritional value of frozen food will be well preserved. Of course, their taste will definitely be worse than fresh.
When using the refrigerator, we must master the common sense of use, not only to ensure the extension of the service life of the refrigerator, but also to eat fresh and healthy food. We collected some problems that should be paid attention to when storing food in the refrigerator. What food can't be put in the refrigerator?
fruit
banana
Bananas will turn black and rot if stored below 12℃.
Fresh litchi
If litchi is left at 0℃ for one day, the skin will turn black and the pulp will turn sour.
Because tropical fruits are afraid of low temperature, they are not suitable for storage in the refrigerator. If refrigerated, they will "frostbite" the fruit, making its epidermis droop and appear dark brown spots, which not only lose nutrition, but also easily deteriorate. Immature fruits should not be put in the refrigerator, otherwise it will be difficult to ripen normally. The correct way is to store it in a cool and ventilated place and avoid light.
garden stuff
tomato
After the tomatoes are frozen at low temperature, the meat is blistered, soft and rotten, or cracked, with black spots on the surface, immature and tasteless, and even rotten in severe cases.
Cucumber and green pepper
Cucumbers and green peppers will be frozen and "injured" if they are kept in the refrigerator for a long time-turning black, soft and stale. Cucumbers also have sticky hairs. Because the temperature stored in the refrigerator is generally around 4℃ to 6℃, the suitable storage temperature of cucumber is 10℃ to 12℃, and green pepper is 7℃ to 8℃, so it is not suitable for long-term storage.
Yezicai
Because it is perishable after refrigeration. It's best not to put it next to the refrigerator.
The suitable storage temperature of Chinese cabbage, celery, onion and carrot is about 0℃.
The suitable storage temperature of cucumber, eggplant and tomato is between 7.2 ~ 10℃.
Pumpkin is suitable for storage above 10℃.
snack
Chocolate
After the chocolate in the refrigerator is taken out, frost flowers are easy to appear on the surface, which not only loses the original mellow taste, but also is beneficial to the reproduction of bacteria. Ruili Li said that the best temperature for storing chocolate is 5℃- 18℃. When the room temperature is too high in summer, it can be sealed with plastic bags first and then stored in the refrigerator. When you take it out, don't open it immediately, let it slowly return to room temperature before eating.
food
ham
If ham is stored in the refrigerator at low temperature, the water in it will freeze, the fat will precipitate, the ham meat will agglomerate or loosen, and the meat will become stale and perishable.
bread
During the baking process of bread, the starch linear segment in flour has aged, which is the reason why bread has elastic and soft structure. With the extension of storage time, the linear part of amylopectin in bread slowly associates, which makes the soft bread gradually harden. This phenomenon is called "aging". The speed of "aging" is related to temperature. At low temperature (above freezing point), bread will age faster, but after being put in the refrigerator, the degree of hardening will come faster.
Fish can't be kept for long.
Fish in the refrigerator should not be stored for too long. The refrigeration temperature of household refrigerators is generally-15℃, and the best refrigerators can only reach -20℃. However, when the storage temperature of aquatic products, especially fish, is lower than -30℃, fish tissues will be dehydrated or undergo other changes. For example, crucian carp will be prone to rancidity, and its meat quality will change and it cannot be eaten. Therefore, fish stored in the refrigerator should not be kept for too long. First, clean the fish's body surface with clear water to remove mucus and other dirt and reduce bacterial infection. Then remove the cheeks, scales and internal organs, wash and cook. If you eat it within 3 days instead of the day after purchase, clean the fish, dry it, put a little salt in it and put it in the refrigerator. If you want to keep it for a long time, you can wash the fish, wrap it in newspapers or plastic bags and put it in the freezer for freezing.
Frozen food should not be stored after thawing. Frozen foods bought from the market, such as meat, fish, chickens, ducks, eggs and quick-frozen vegetables, should be processed and eaten as soon as possible once thawed, and should not be stored. If stored for too long, meat, fish, chicken, duck, etc. It will be restored by the vitality of bacteria and enzymes, which will not only rapidly reproduce and decompose protein and cause deterioration, but also produce toxic histamine substances, which will cause food poisoning if people eat it; Frozen vegetables stored for a long time will not only change color, lose nutrition and decrease quality, but also rot easily and become inedible. Frozen meat, frozen fish, frozen chicken and frozen duck, their tissues and cells will be destroyed by the crystallization of water. Once thawed, a large amount of protein will ooze from the damaged tissues and cells and become food for bacteria to multiply. The experiment showed that the fresh mackerel frozen 1 day was stored at 30℃ for 6 hours, and its spoilage rate was faster 1 times than that of fresh fish. After thawing, the number of bacteria increased by about 2 times when the egg yolk was placed at 65438 08℃ for 2 hours, and increased by more than 50 times after 8 hours. Frozen fresh eggs were stored at 0 ~ 65438 05℃ for more than 65438 00 days. Due to the long-term change of cold and hot temperatures, not only the egg membrane becomes loose and the egg white becomes thin, but also the eggs become sticky, yellow, and even moldy and smelly, making them inedible. Frozen vegetables, especially in hot weather, are not suitable for storage, otherwise green leafy vegetables will turn yellow soon and vitamin C will be easily destroyed. When vegetables are stored at 20℃, the decomposition loss of vitamin C is twice that of vegetables stored at 6 ~ 8℃.
other
traditional Chinese medicine
Not suitable for the refrigerator. If the medicinal materials are put in the refrigerator and mixed with other foods for a long time, not only are all kinds of bacteria easy to invade the medicinal materials, but they are also easy to get wet and destroy the medicinal properties of the medicinal materials. Therefore, for some precious medicinal materials, such as ginseng, velvet antler, gastrodia elata, codonopsis pilosula and so on. If they need to be preserved for a long time, they can be put into a clean glass bottle, and then a proper amount of glutinous rice fried to dark yellow with slow fire, cooled and put in, and the bottle cap is sealed.
Leftover moon cakes
Moon cakes are cakes made of flour, oil, sugar and nuts. Baked food should not be stored in the refrigerator. Although for some kinds of moon cakes, putting them in the refrigerator can prolong the shelf life, it will still affect the taste. This is because the starch in the raw materials of moon cakes will mature and soften after baking, but at low temperature, the mature starch will precipitate water and age (that is, "retrogradation"), making the moon cakes hard and the taste worse.
In addition:
A. Cucumber and tomato: Cucumber avoids ethylene, while tomato contains ethylene. They will spoil cucumbers together.
B. Bread and biscuits: biscuits are dry and have no moisture, while bread has more moisture. When they are put together, cookies will become soft and lose their crispness, while bread will become hard and not delicious.
C. Rice and fruit: Rice is easy to be heated, fruit is easy to evaporate water and dry up when heated, and rice will become moldy or worm after absorbing water.
D. Fresh eggs and ginger and onions: There are many small pores on the eggshell, and the strong smell of ginger and onions will drill into the pores, which will accelerate the deterioration of fresh eggs. After a while, the eggs will stink.
Tell you some common sense, please be sure to put an end to the occurrence of "refrigerator diarrhea" and store processed food reasonably.
1. Put a thermometer in the freezer to keep its temperature at 4- 10℃.
2. Store raw and cooked separately, and pack with fresh-keeping box or plastic wrap to avoid cross-contamination.
3. Cooked food should be stored when it is cooled to room temperature, and the longer it is stored at room temperature, the more dangerous it is.
4. The food taken out of the refrigerator should be heated indoors for more than 15 minutes.
5. the storage time should not be too long, and the food that needs to be preserved for a long time should be put in the freezer.
6. Clean the refrigerator frequently and keep it clean.
There are six taboos for storing and freezing food:
1, hot food must not be put into the running refrigerator.
2. The food should not be too full or too tight, and there should be a gap to facilitate cold air convection, reduce the load of the unit, prolong the service life and save electricity.
3. Food should not be mixed raw and cooked to maintain hygiene. According to the requirements of food storage time and temperature, the space in the box is reasonably utilized. Don't put the food directly on the surface of the evaporator, but put it in a vessel to avoid freezing on the evaporator, which is inconvenient to take out.
4. Fresh fish, meat and other foods cannot be put into the refrigerator without treatment. Fresh fish and meat should be packed in plastic bags and then stored in the refrigerator. Vegetables and fruits should be dried on the outer surface, placed at the bottom of the box and stored at zero temperature.
5. Bottled liquid drinks should not be put into the freezer to avoid freezing and cracking the packaging bottles. It should be stored in the refrigerator or on the door, preferably at around 4℃.
6. Refrigerators that store food should not store chemicals at the same time.
7. Bottled liquid drinks should not be put into the freezer to avoid freezing and cracking the packaging bottles. It should be placed in the refrigerator or on the door, and the best storage temperature is about 4℃
In addition:
A. Cucumber and tomato: Cucumber avoids ethylene, while tomato contains ethylene. They will spoil cucumbers together.
B. Bread and biscuits: biscuits are dry and have no moisture, while bread has more moisture. When they are put together, cookies will become soft and lose their crispness, while bread will become hard and not delicious.
C. Rice and fruit: Rice is easy to be heated, fruit is easy to evaporate water and dry up when heated, and rice will become moldy or worm after absorbing water.
D. Fresh eggs and ginger and onions: There are many small pores on the eggshell, and the strong smell of ginger and onions will drill into the pores, which will accelerate the deterioration of fresh eggs. After a while, the eggs will stink.
Tips for storing vegetables in the refrigerator. Green leafy vegetables wither easily. To keep them fresh, it is indeed a way to put them in the refrigerator, but it is best to control the temperature of the refrigerator between 0 and 4 degrees Celsius, put a fresh-keeping bag outside or store them in a fresh-keeping box to achieve the effect of fresh-keeping. Remember that it is best not to wash before storage, and the storage time should not be too long, otherwise the dishes will be easily covered.
Tuber vegetables, such as potatoes, cucumbers and carrots, are not so delicate. Just keep it at room temperature, there is no need to put it in the refrigerator. It should be noted that tomatoes are not suitable for storage in the refrigerator. Because tomatoes are frozen at low temperature, the meat will bubble, the umami will disappear, it is not easy to cook, and it will be rancid and rotten in serious cases.
Fruits not suitable for storage in the refrigerator. There are still many fruits that are not suitable for storage in the refrigerator, especially mangoes, persimmons, bananas and other fruits with sauces. The so-called jam fruits are those fruits that can be peeled and have jam-like pulp. Berry fruits will lose their fragrance and their skins will deteriorate at low temperature. For example, we all know that bananas are easy to turn black and rot when placed below 12℃, and fresh litchi will turn black and taste when placed at 0℃ for one day. Citrus fruits, such as oranges, lemons and oranges. It is easy to penetrate into the pulp at low temperature, and the pulp will be bitter, which is not suitable for refrigerator. Citrus fruits are best stored at room temperature of 15 degrees. Instant fruits, such as strawberries, bayberry, mulberry, etc. , it is best to buy it immediately. Putting them in the refrigerator will not only affect the taste, but also easily mildew. Apples and watermelons can stay in the refrigerator for a short time to extend the shelf life.
How much food is the most energy-saving in the refrigerator?
The amount of food stored is indeed related to the power consumption of the refrigerator. Lu, a refrigerator technician in Jinhua Branch of Suning Appliance, explained that when there is too little food stored in the refrigerator, the heat capacity will become smaller. After the refrigerator door is opened, the cold air will be released too quickly, which will increase the number of compressor starts. Too much food storage is not conducive to the circulation of cold air, and it is easy to freeze in the refrigerator, which increases the running time and power consumption of the compressor. The uneven temperature in the refrigerator will affect the fresh-keeping effect of food.
For the storage of food in the refrigerator, Lu put forward such a suggestion: neither too much nor too full nor too little, and the storage of food in the refrigerator should be 60% ~ 70%.
If there is space for food in the refrigerator, you can use several plastic cups to hold water, make ice cubes in the freezer and put them in the freezer to prolong the downtime of the refrigerator and save electricity by reducing the start-up time.
When placing articles, there should be a gap of more than 10 mm between foods and the inner wall of the refrigerator, so that the gas in the refrigerator can circulate, the temperature is uniform and stable, and electricity can be saved. Fruits, vegetables and foods with a lot of water should be wrapped in plastic bags or plastic wrap before putting them in, because there is a lot of water in the refrigerator, which will also increase power consumption.
What are the factors that affect the power consumption of refrigerators?
Lu introduced that the factors affecting the actual power consumption of refrigerators involve factors such as refrigerator environment, food storage capacity, temperature control in the cabinet, and the number of times of opening doors.
● The ambient temperature should not be overheated. The ambient temperature has a direct impact on the power consumption of the refrigerator. When the ambient temperature rises, it will slow down the heat dissipation of the refrigerator, and the slow temperature drop in the refrigerator will lead to longer startup time and increased power consumption. According to the experimental data of ordinary refrigerators, when the ambient temperature reaches 32℃, the power consumption is about twice that of 25℃, and the power consumption at 30℃ is 1.6 ~ 1.8 times that at 25℃. Therefore, the refrigerator should be placed as far away from the heat source as possible, preferably in a ventilated and cool place.
● The thermostat gear is frequently adjusted. Every refrigerator has a thermostat, and the temperature in the refrigerator can be adjusted by adjusting the gear position. The higher the thermostat, the lower the temperature in the refrigerator. When the freezing chamber reaches-18℃, it is difficult to descend every 1℃. The colder it is, the harder it is to drop, but the lowest temperature for continuous operation can reach below -24℃. At this time, it will take a long time to start or even stop because of the large temperature difference between inside and outside and the large loss of cold energy.
If the start-up time is long because the gear is too high, you may wish to lower the gear of the thermostat, and the start-up time will be significantly shortened. If-18℃ is often used instead of -22℃ in the freezer, it can save 30% power consumption.
● Minimize the number of door opening. When you open the refrigerator door, you can feel the cold air running out, which will inevitably cause the temperature in the refrigerator to rise, resulting in the thermostat not reaching the stop temperature, which will lead to the compressor working for a long time and increasing power consumption.
● It is very important to defrost in time. Frost is a bad conductor of heat, which covers the surface of evaporator and becomes a heat insulation layer between evaporator and food in the box, affecting the heat exchange between evaporator and food in the box, making the temperature in the box unable to drop, reducing the refrigeration performance of refrigerator, increasing power consumption, and even causing the compressor to heat up and burn down after long-term operation. In addition, there are smells of various foods in the frost. If it is not thawed for a long time, it will make the refrigerator smell. Generally speaking, when the frost layer reaches 5 mm thick, it should be removed.
- Related articles
- In the 37th minute of Episode 28 of Part 3 of Criminal Investigation Files, what is the name of the English song that plays the background music of Dayong drinking in the bar? Who knows?
- How many modes does Zero Butterfly XBOX have?
- Anderson Deco's Off-court Life
- Dreaming of a sign that the soles of your feet are scratched
- Where is the best place to take pictures in Xiamen?
- Introduction of Alfred Stiglitz
- If you wake up from your dream, the complete works of txt are free.
- Deng Chao's photographic works
- What are the characteristics of Zhongyuan Institute of Technology?
- Top ten outstanding designers? China's top designer? Please tell me, please