people buy black fungus smell (video screenshot)
according to the testing process, Song Xigui bought the four dry ears of Mr. Liu, mashed and weighed respectively. According to Song Xigui, sulfur dioxide can produce sulfur dioxide after burning. If sulfur is used to smoke Auricularia auricula, there will be sulfur dioxide residue on the fungus.
reporter learned that testing a sample of sulfur dioxide, in addition to the above mentioned links, also need to add a variety of reagents, through microwave extraction, filtering and other links.
black fungus odor pungent instrument can detect sulfur?
If sulfur fumigating food, excessive intake of sulfur, will cause damage to the human nervous system, light will appear dizzy, eye flowers, fatigue and other symptoms, serious will affect the liver and kidney function.
after nearly two hours of waiting, the test results finally came out. Mr. Liu's 4 household Auricularia auricula purchased at different locations and time were in fact smoked by sulphur.
Song Xigui said, "by testing, the No. 2 sniffed the sour smell of the nose, but the results were less than 5 milligrams, that is to say, less than 5 milligrams, it could not be detected, and the test was equal to no apparent sulfur dioxide."
test results showed that no sulfur dioxide was detected in the samples from 1 to 4, that is, the four Auricularia auricula was not smoked by sulfur. Why, then, 2 and 4 Auricularia auricula smelled, and the water was yellow and sour.
"it is possible in the process of processing, the time has not been in time dry, metamorphic acid, the acid is not sulfur dioxide, so it can not detect the taste of deterioration." Song Xigui said: "but in the process of dry fungus, it is very sticky, it is not easy to dry, it is a lot of mucus in the inside, water evaporation is relatively slow, if catch up with cloudy rain, or the long time can not dry, it may occur sour deterioration, produce a part of sour taste."
Song Xigui said that after rancidity, some of its components are easily soluble in water, so the color of bubbles may be heavier. However, experts remind you that this kind of pungent fungus is best not to buy and eat.
also, experts say, there are some illegal traders in the market to make the dry fungus heavy, they will be processed two times, add some starch, sugar, salt and so on to soak the ear, and then dry. This kind of fungus is black and bright in color, very unnatural, and has a pungent odor.