Whether it's eating out or cooking at home, we often inevitably leave some food, especially when we come to our guests, we will do more if we don't care. How to save the food that has not been eaten? How long can it be stored? How to deal with it before the next meal? The Dahe Health News reporter interviewed Professor Huang Xianqing, the vice president of the College of Food Science and Technology of Henan Agricultural University.
Can be stored in the refrigerator for one or two days
Professor Huang said that for the uneaten meals, the main safety hazard is microbes, which can inhibit the growth of most microorganisms in the refrigerator at low temperature (0 °C ~ 4 °C). However, some microorganisms can also grow at low temperatures, such as Yarrowia, Listeria, and Pseudomonas, which can grow in an environment of -15 ° C ~ 20 ° C. Therefore, leftovers should not be stored in the refrigerator for too long, so as not to be contaminated by psychrophilic bacteria. It is best not to eat leftovers, such as meals that have not been eaten at noon. Try to eat them at night. Store them in the refrigerator for up to two days. The longer the storage time, the greater the risk of microbial contamination.
Add plastic wrap when storing
“When storing, you should add a plastic wrap.†Professor Huang said that the taste of various foods is different, and the plastic wrap is applied to prevent them from odorizing each other. In addition, wait for the food to cool before putting it in the refrigerator. The steaming of the hot food will increase the energy consumption of the refrigerator.
Insufficient staple foods, such as rice, taro, scallion cake, bread, dumplings, etc., starch is prone to aging, that is, dried, hardened, starch after aging, not only taste worse, digestion and absorption rate in the human body It also decreases.
Mao Yuyang, a professor at Yangzhou University's business school, pointed out that the storage temperature of food is also related to the speed of starch aging. The optimum temperature for starch aging is 2 °C ~ 4 °C, and the storage temperature is above 60 °C or below -7 °C. It is not easy to cause aging of starch. Therefore, the staple food that can not be eaten can be put into the fresh-keeping bag and placed in the freezer (-18 ° C) to extend the shelf life and prevent dry cracking. Note that the storage time in the freezer should not exceed 1 month to avoid contamination by pathogenic bacteria.
Professor Huang said that for soups and porridge, if there is less left, it is generally sealed and placed in the cold room. If there is more left, such as soup for seasoning, it can be placed in the freezer to extend the shelf life. .
Leftover green leafy vegetables are not recommended for storage
Professor Huang said that the endless green leafy vegetables are prone to nitrite during storage, which combines with protein decomposition products to produce nitrosamines, which are carcinogenic. Although refrigerated can reduce the production of nitrite, and the risk of cancer is related to the intake of nitrite, it will not cause cancer if it does not exceed the standard, but we still need to consume nitrite as little as possible. The best way is to Eat less green leafy vegetables, buy it now, and do it once a time. If you can't finish it, don't store it for too long. Don't eat it for more than two days.
Fully heat before eating next time
Professor Huang reminded that the endless meals must be fully heated before the next meal, because the temperature of the refrigerator can only inhibit the proliferation of bacteria, and can not completely kill them. If there is no heating before eating, diarrhea, vomiting and other foods may occur after eating. Symptoms of poisoning.
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