Starting from today, the Shanghai Food Safety Special Edition will be upgraded, and the Shanghai Morningside Health App Channel, a Shanghai Morning Post news channel, will jointly launch the column entitled “Gu Da Cafe Mealsâ€.
If you are still confused about the circle of food rumors about your friends, if you are still confused about the misconceptions of online eating habits, please move to a small bench and follow up every week to listen to the most authoritative in Shanghai. Gu Zhenhua, one of the most senior food safety experts, unleashed a “trick†and explored the healthiest and correct way of eating.
Gu Zhenhua
â— Shanghai's most authoritative food safety expert
â— engaged in the food industry more than 30 years
â— Former Shanghai Food Safety Commission
Deputy Director of the Office, former Shanghai Food
Deputy Director of Drug Administration
â—Chairman of the Shanghai Food Safety Federation
Refrigerator storage time limit for common foods
Beef: refrigerate for 1-2 days, freeze for 90 days
Meat platter: chilled 2-3 days, frozen 270 days
Chicken: Frozen for 2-3 days, frozen for 360 days
Fish: refrigerated 1-2 days, frozen 90-180 days
Sausage: refrigerated for 9 days, frozen for 60 days
Egg: Frozen 30-60 days cooked eggs: Frozen 6-7 days Milk: Frozen 5-6 days Yogurt: Refrigerated 7-10 days Beverage, alcohol: 4 °C storage, try to open the leftovers after opening: refrigerated Not more than 3 days leftovers: Vegetables should not be stored in the refrigerator, it is recommended to now burn peanut butter, sesame sauce: after opening the canned refrigerated 90 days Canned Food: unopened canned refrigerated 360 days tomatoes: refrigerated 12 days spinach: refrigerated 3-5 days Citrus: Refrigerated 7 days carrot, celery: 7-14 days cold pear: refrigerated 1-2 days
Morning News reporter Xu Yifei
Recently, Shencheng entered a period of heavy rain, and with the temperature of more than 20 °C, the preservation of food has become a particular concern. Every household has a refrigerator. When it comes to food, it's all okay. Gu Zhenhua, chairman of the Shanghai Food Safety Federation, reminded that refrigerators are not safes and should be used with proper methods.
Low temperature can inhibit microbial proliferation
Because food spoilage is the result of metamorphic fermentation of microorganisms in food, the warmer room temperature, especially in summer, is particularly suitable for the growth of microorganisms. The low temperature of the refrigerator can slow down the propagation of microorganisms, so it can relatively extend the food preservation period. For another major culprit "enzymatic" food deterioration, refrigerator temperature inhibits the activity of the enzyme, extending the shelf life.
Many people worry that food will spoil and become moldy and they will all be stored in the refrigerator. However, there are also claims that some foods are not suitable for putting into the refrigerator, such as root vegetables, tropical fruits, and cakes. It should be noted that whether or not the refrigerator can be put can not be generalized, but in the case of high temperatures in the summer, stems and tropical fruits sometimes need to be put in refrigerators. However, due to the tendency of discoloration and the like, it may affect the taste of the refrigerator after it is stored for a long time, so it needs to be eaten as soon as possible.
Tropical and subtropical fruits such as bananas and mangoes need to be refrigerated before ripening, and can be placed at room temperature after ripening; starchy foods such as steamed buns, rolls, and breads, remember not to put a cold room, because it will dry out. Hardened, preferably in cling film or fresh-keeping bag and then put into the freezer; bacon, ham and other meat pickled products are suitable for a cool, ventilated place, but can slow down the decline of oil and fat, and extend its shelf life under refrigerated conditions .
Bulk food should often clean the refrigerator
In the past, when people used refrigerators, they often experienced “defrostingâ€. After using the refrigerator for a period of time, the interior walls were thickly frosted and people needed to manually defrost. However, today's refrigerators are mostly frost-free, eliminating the need for this trouble, but they still need to be cleaned during the use of the refrigerator.
In particular, when placing bulky, odor-laden foods in the refrigerator, it is necessary to pay attention to frequent cleaning. Once the bulk foods are dropped into the refrigerator, the protein and fat in them will easily deteriorate, affecting the hygiene of the refrigerator. If the refrigerator is filled with canned, fully packaged food, there is almost no need to clean it up.
The refrigerator should be cooked and separated. Each food in the refrigerator has its own shelf life, and the storage period is different under different temperature conditions. In general, the freezer temperature in the home is between 1-10°C, and the freezer can reach minus 10°C or even lower. Whether food should be refrigerated or frozen is related to the nature of the food itself. Meat and aquatic products can be refrigerated and frozen at the same time, and the refrigerating time is relatively short; but like vegetables, it is not suitable for freezing.
Please note the following points when using the refrigerator. First of all, raw and cooked should be separated, raw food and cooked foods have different storage time and temperature requirements, and raw food is prone to various parasites and bacteria, and mixed with cooked food is easy to cross-contamination.
Second, the refrigerator should not be set too full, or it will easily cause cross-contamination of food bacteria, but also affect the refrigerator cooling effect. When storing food, it is best to leave a certain gap between each other so that the air in the refrigerator can be convectioned and the cooling effect can be guaranteed.
For health needs, some appropriate treatment should be performed before putting fish, pork, beef and other foods in the refrigerator. Foods such as fresh fish and meat are best packaged in plastic bags and put in the freezer for storage. However, a packaged beverage is not suitable for direct placement in the freezer because the volume of ice is greater than water and may freeze the package after freezing.
The food that has just been burned must be left cold and then put in the refrigerator. Putting it in directly means that the refrigerator must increase the horsepower to lower the temperature, which may reduce the service life of the refrigerator.
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