The watermelons bought are too big to be eaten, and many family practices are put in refrigerators to eat the next day. However, in recent days, a wide-ranging news spread on Weibo, WeChat and other social networks, “Watermelon downgraded a family of three overnight, and experiments proved that the number of watermelon bacteria in the overnight was calculated in billionsâ€, causing many people to panic. According to the “Qilu Evening News†report, a family of three ate frozen overnight watermelons, all of them diarrhea and entered the hospital. Subsequently, the newspaper reporter sent half an overnight watermelon (with plastic wrap on the surface) placed at room temperature to the relevant department for testing. The staff sampled the surface of the cut surface of watermelon, 4 cm below the surface, and 8 cm below the surface. A sample of 1 g was sampled at each site. The mixture was chopped and placed in the culture medium. The numbers 1, 2 and 3 were marked and placed in the incubator. . After 12 hours, there was a dense group of bacteria in No. 1 medium. The experimenters said that the number of bacteria was difficult to count and needed to be calculated in hundreds of millions; No. 2 was slightly less than No. 1; No. 3 was also difficult to find. Calculations. Finally, we came to the conclusion that hundreds of millions of watermelon bacteria were overnight, and we appealed to everyone to throw away the overnight watermelon. Is this true? The reporter specially invited authoritative experts to verify. He Jiguo, associate professor of the College of Food Science and Nutritional Engineering at the China Agricultural University, told the reporter that the experiment seems to be persuasive, but it has made a very important mistake, lacking comparison with refrigerated storage. Because the watermelon storage conditions in the experiment are not the same as in the family. Our usual practice is to put unfinished watermelon in the refrigerator and cover it with plastic wrap and an insurance lunch box. The low temperature environment can inhibit the growth of microorganisms, and the surface cover can prevent secondary pollution. However, the watermelon that was sent for experiment was stored at room temperature overnight, and the temperature in summer was high. Watermelon can easily grow bacteria in this environment. Song Xin, a dietitian at Beijing Chaoyang Hospital, said that in the news, it was an overnight watermelon that brought down a family of three, but they ate frozen watermelon, and the watermelon that was sent to the experiment was placed at room temperature, so the two were not comparable, and, There are many factors of diarrhea, the report did not say clearly whether to go to the hospital to check the situation of bacterial infection, ice watermelon cold in the cold, uncomfortable eating is related to personal physical problems. Therefore, readers do not immediately worry about the news. Despite this, Zhong Kai, an associate researcher at the risk communication department of the National Food Safety Risk Assessment Center, said that watermelons that are not eaten should not be released for a long time. The cut watermelons are usually stored for a maximum of 4 hours at room temperature, and they can be safely stored in time. In addition, the watermelon is best covered with a clean plastic wrap, or the remaining watermelon is dug into a sealed crisper. He Jiguo pointed out that this experiment also has some positive significance. Before the cut, all watermelons were sterile inside. After cutting, the bacteria source of the watermelon was knife, air and cling film. If the experimenter cuts the watermelon and immediately puts on the plastic wrap, a large part of the hundreds of millions of bacteria on the surface of the watermelon may be caused by the knife or the plastic wrap being not clean. This reminds everyone that when cutting watermelons at home, they must first wash the knife clean, and immediately cut open and put a clean plastic wrap into the refrigerator. Buy cut watermelon as little as possible outside. If you must buy it, you can't trust it. You can cut off the watermelon on the surface before eating.
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