Experts interviewed for
: Chen Xiafei, chief nutritionist of Shanghai East China Hospital,
recently, the word “frozen meat” has entered the people’s view again. In order to control the rise of pork price, from May 5 to July 4, Beijing will take the lead in releasing frozen pork stored by the Beijing Municipal Government in 20 chain supermarkets or stores that carry out the pilot construction of pork circulation traceability system. The reporter visited many supermarkets and found that at present, many stores have pulled out the banner of “our store begins to sell pork subsidized by the Beijing municipal government”. In addition, Sichuan, Shaanxi, Gansu and other places also announced to put pork reserves on the market. However, many people are puzzled. Can frozen meat be safe to eat? How to deal with it better? To this end, Shanghai East China Hospital Chief nutritionist Chen Xiafei answers questions for you.
life times: will frozen meat be affected in terms of safety, nutrition and taste?
Chen Xiafei: first of all, we need to understand what frozen meat is. According to the national standards, frozen and fresh meat can be divided into hot fresh meat, cold fresh meat (sour meat), frozen meat. Frozen meat refers to the meat that is quickly frozen below – 25 ℃ after slaughtering, and then stored, transported and sold (frozen state) in the environment below – 18 ℃. Frozen pork can be stored for up to one year, and only four months of frozen meat has been put on the market. Frozen meat is a different matter from the previous media reports. In terms of safety of
, low temperature is beneficial to inhibit the growth and reproduction of most microorganisms, and can also delay many adverse biochemical reactions. Therefore, compared with other meat, frozen meat can prolong the storage life of meat. From the nutritional point of view,
can cause certain damage to the cell structure of meat due to the rapid freezing of moisture and the increase of volume during the freezing process, resulting in the content of the cell flowing out after thawing, especially the loss of B vitamins. However, as long as it is not repeatedly frozen, thawed and frozen for a long time, compared with the loss of nutrition in daily cooking, these losses can be ignored. In addition, the biggest nutritional value of eating meat is to supplement minerals such as protein and iron, but the two nutrients in frozen meat are not different from other kinds of meat.
of course, in the taste of frozen meat, there is juice loss after thawing, resulting in the taste is often not as fresh and juicy as cold meat, relatively dry wood, less light.
life times: many people say that frozen meat is not safe, it’s better not to buy it. Is this true?
Chen Xiafei: the frozen meat produced by regular manufacturers strictly abides by the national requirements in terms of production, storage and quality management. As long as the temperature of the freezer reaches the standard and the food is stored properly, there will be no food safety problem in general. In addition, freezing itself is a good way to extend the storage life of meat. For meat and seafood rich in protein, if you can’t eat them in time, cut them into small pieces and freeze them in the freezer.
life times: what is the difference in the freezing time of different types of meat? What should family preservation pay attention to? How long is the best time to finish?
Chen Xiafei: if the frozen meat can be stably stored below – 18 ℃, it can be stored for up to one year. However, due to the factors such as frequent opening and closing of the refrigerator door, the temperature inside the refrigerator changes and the storage life is shortened. Therefore, even if there is no expiration date, it is best to eat frozen meat within one month after buying it home.
cold and fresh meat, also known as paisuan meat, is frozen and sold at 0 ℃ ~ 4 ℃. This kind of meat is usually eaten more. Cold fresh meat is best to buy and eat now. If you don’t eat it on the same day, you can refrigerate it at 0 ℃ ~ 4 ℃ for 3 days. If put into the refrigerator freezer, the best in a month to eat.
hot fresh meat were not more than one day. Since the hot meat is not refrigerated or frozen, it should be eaten on the same day after purchase. Otherwise, microorganisms are easy to contaminate meat and grow rapidly, so the safety is poor. Especially in summer, the temperature is high, the microbial pollution is more serious, need to eat in time.
life times: what should be paid attention to when buying frozen meat? First of all, you should choose “regular” or “frozen” brand of “chenxiafei”. For frozen meat with packaging, check whether the package is complete, and pay attention to whether the production date and shelf life are within the normal range. Secondly, do not buy too much frozen meat at one time, avoid repeated thawing, freezing, if you can buy and eat now is the best. Thirdly, we can grasp the quality of meat by watching, smelling, pressing and touching. See: if there is any change in color, for example, the color of red pork becomes lighter and darker, and the fat part turns yellow, which indicates that the meat quality may be stored for too long; smell: whether there is peculiar smell, such as Harrah smell, odor, etc., it is not fresh; press: press the meat piece with hand after thawing, the depression can bounce; touch: if the surface is sticky after thawing, it means it is not fresh.
life times: after buying frozen meat, how do you cook it best when you go home?
Chen Xiafei: I would like to emphasize that frozen meat must avoid repeated thawing and refrigeration. Otherwise, it will not only lead to the loss of meat flavor and nutrition, but also lead to microbial breeding, aggravating meat deterioration.
stored for a long time, but not deteriorated, are more suitable for stewing, burning and other cooking methods. Because the heating time is long, it can kill microorganisms to the greatest extent, and help to improve the taste. It is not suitable to use steaming, frying and other cooking methods with less time. ▲