Chinese wolfberry's "color" of sulfur

The price of the most toxic Lycium barbarum exceeds the standard of sulfur dioxide by hundreds of times Long-term consumption damages the safety of liver and kidney food, which affects everyone's daily life and health With the exposure of some food problems in recent years, food safety has become the focus of people's attention In this issue of life lab, the reporter selects two problems related to food safety that are concerned by netizens to carry out experiments: one is the quality of Lycium barbarum price on the market, and the other is to identify the advantages and disadvantages of soy sauce through alcohol To the reporter's surprise, after testing, some illegal traders actually use the method of sulfur price fumigation for artificial "make-up" in order to make the color of wolfberry bright and sell well Can alcohol in experiment a identify soy sauce? Is it true that soy sauce can be identified by alcohol? Reporters buy three kinds of soy sauce from the market It is difficult to judge the quality of soy sauce from the naked eye and smell alone Moreover, the taste and color of the three kinds of soy sauce are very similar How on earth can we distinguish the pros and cons of soy sauce? The reporter decided to use the alcohol identification method provided by netizens for verification There are three kinds of soy sauce samples with the same volume in the experiment of sediment produced by mixing soy sauce and alcohol Before the experiment, the reporter identified the No 2 and No 3 soy sauce as high-quality soy sauce and the No 1 soy sauce as poor Then, the reporter prepared three bottles of 150 ml of alcohol with a purity of 75% According to the method on the Internet, take 25 ml of each soy sauce, and then pour them into three bottles containing 150 ml of alcohol respectively Cover the bottles and shake them to mix A few seconds later, a very thick sediment appeared in the bottle containing the No 3 soy sauce and alcohol mixture; a lot of floccules appeared in the bottle containing the No 2 soy sauce and alcohol mixture, and a little residue hung on the bottom of the bottle; but there was no sediment in the bottle containing the No 1 soy sauce and alcohol mixture Experts say that poor soy sauce does not contain protein Why does high-quality soy sauce produce sediment when mixed with alcohol, while poor soy sauce does not? After consulting experts, the reporter learned that soy sauce is made of soybeans, which are rich in protein When protein meets alcohol, it will have chemical reaction and produce sediment The main components of poor soy sauce are caramel pigment, benzol, salt and water Without protein, it is impossible to have chemical reaction with alcohol Therefore, alcohol can really identify the pros and cons of soy sauce Experiment B: the price of Lycium barbarum is too bright Is it fumigated by sulfur price? (true) in July and August every year, it's the season for the price of Lycium barbarum to harvest But recently, there's continuous news on the Internet that the price of Lycium barbarum in the market may be artificially "made up" It is said that in order to make the price of wolfberry more bright, some illegal traders may use the method of sulfur price fumigation to artificially "make up" the price of wolfberry Reporter bought 6 wolfberry prices 5 have problems with the bright color of wolfberry prices, really will go through artificial "makeup"? Reporters in Fengtai District, Beijing, a drugstore, a local specialty stalls and Hebei Anguo City, the regular drug market, bought six wolfberry prices The reporter sent the six samples of wolfberry prices to the agricultural and sideline commodity quality supervision, inspection and testing center of China Federation of Commerce to test the sulfur dioxide content of the six wolfberry prices The reporter received the shocking test results Among the 6 samples of Lycium price tested, in addition to the price of Lycium purchased in Beijing drugstore meeting the national standard, the sulfur dioxide content of the other 5 samples of Lycium price all exceeded the standard! The price of the most poisonous Lycium barbarum exceeds 100 times of sulfur dioxide According to the test report, the reporter bought two Lycium barbarum prices in Anguo herbal medicine trading hall, one with sulfur dioxide content of 68.4 mg / kg, slightly exceeding the standard; the other with 119 mg / kg, more than twice the national standard; the reporter bought one Lycium barbarum price in Anguo herbal medicine store, with sulfur dioxide content of 540 mg / kg, nearly 10 times the national standard! What's more surprising is that the so-called "price king of Chinese wolfberry" bought by the reporter at the local specialty stall has a sulfur dioxide content of 971 mg / kg, nearly 20 times higher than the national standard! In addition, the reporter from illegal traffickers to buy low-cost "over the price of wolfberry", sulfur dioxide content is as high as 5030 mg / kg, more than 100 times the national standard! The reporter put the price of 6 pieces of wolfberry together After observing the color, he found that the most toxic "price of wolfberry" color was obviously much brighter The price of edible sulfur, Lycium barbarum, will lead to neuritis Are the prices of these sulfur dioxide overproof Lycium barbarum fumigated by sulfur price? When the reporter called Ma Jianguo, director of the wolfberry Price Research Institute, Ma said: "those over 500 (mg / kg) and 600 (mg / kg) must be smoked with sulfur price." So, what harm will eating the price of wolfberry fumigated by sulfur price do to our health? Wu Xiaoling, chief physician of Clinical Nutrition Department of Beijing Anzhen Hospital, told reporters: "sulfur dioxide in the atmosphere and in food is very hydrophilic It will deposit under the moist mucous membrane of our respiratory tract, which is corrosive to our mucous membrane Long term consumption will cause liver and kidney damage, resulting in neuritis and bone marrow atrophy " Experiment C hot summer wear red clothes cool? (false) it's hot recently There are many ways to avoid summer heat, even to wear clothes Many netizens say that it's cooler to wear red clothes in summer than white ones More netizens explained that red clothes have the longest wavelength and can absorb a lot of ultraviolet rays in the sun, so wearing red clothes is the coolest So is this explanation reasonable? White clothes have low temperature after heating For this reason, the reporter came to Beijing Institute of fashion and interviewed Professor Gong Yan Professor Gong told the reporter: "sunlight is composed of very rich light waves There are ultraviolet and infrared rays Ultraviolet rays will not give us a warm feeling When infrared rays hit us, we can't see them, but we can feel the temperature rise." Therefore, the theory that red absorbs ultraviolet light circulated on the Internet is not true The reporter bought two red and white clothes of the same material and tested them in Beijing Institute of fashion The experimenter carried out experiments on two clothes through the infrared fast dryer After the initial temperature was adjusted to 40 ℃, the temperature of white clothes was the lowest White light clothes are the coolest in summer Is it true that white clothes are the coolest? Professor Gong told reporters: "from the perspective of color science, if we wear red clothes, in fact, it absorbs mainly yellow and green light, while white will reverse all colored light, and will not absorb it." Then the reporter did a group of experiments with three clothes of the same color but different thickness, and the results showed that the temperature of the relatively thin clothes was slightly lower In response, Professor Gong explained, "because the denser the weave, the better the warmth retention, the higher the temperature it measures; the thinner the heat dissipation, the better the air permeability, the lower the relative measured temperature." It seems that in summer, if we want to be cooler, we'd better wear white and light clothes Experiment d pick up the needle and pencil lead in one second with a paper towel? (true) some netizens said that it is true that the needle can be picked up quickly from the ground with a paper towel? The reporter made an experiment First, take a tissue at will, fold it in half and then fold it in half, cover the needle on the ground with the folded tissue, and pick it up quickly Why can you pick up the needle quickly after simply folding the paper in half? After interviewing physics experts, the reporter learned: "to touch the needle with your fingers, the contact area is very small, but if you wrap the needle with paper, the area of the contact needle will be large, so you can pick up the needle easily, without slipping." In fact, in addition to picking up the needles dropped on the ground, there are many small things in life that can be picked up with paper towels For example, the pencil lead can be picked up easily in the same way (reporter Zhang Ningjiang)