you see, the heart of the white radish has a clear light blue.
test results showed that the possibility of pesticide residues in blue heart radish. (blue light three test cards are the root cuticle of radish, blue heart, head epidermis, deep blue as water sample)
hydrogen peroxide test showed that radish has no dioxygen trace of dioxygen. (the Yellow squid on the right is soaked in hydrogen peroxide, there is a color reaction, as a contrast)
Han Yuming / film reporter Xu Jinlu
see white radish, carrots, but have you ever seen the blue radish? Ms. Lang Maoshan, who lives in the Lang Maoshan District, bought the white radish two times in half a month. Is this a natural phenomenon or is it polluted? In order to verify whether there was any problem with radish, the reporter conducted an in-depth investigation. Related vegetable experts say blue heart radish is relatively rare, probably due to the accumulation of anthocyanins or anthocyanins.
the citizens called
the white radish bought two times, all of the blue heart
the woman who lived in the Lang Maoshan district. The white radish she bought two times is all blue heart. I've only seen white heart radish and red radish before, but this blue heart radish section has never seen her.
the first time was more than 10 days ago, Ms. Duan told reporters that in the morning, she went to the vegetable market near the district to buy vegetables. Buy a white radish back, cook at noon to open a look, but found that the heart of the radish is blue. "It was rare, never seen." Ms. Duan said. She could not figure out what was going on, and Mrs. Duan threw away the radish.
it didn't occur to me that after a week's time, she met blue heart radish again. On the morning of the 8 morning, after buying 2 radishes and cutting them home, "the blue heart really scared me." Ms. Duan said, "I can't eat this. I don't have any idea in my mind."
market survey
reporter to the same market to buy radish, no blue heart
under the guidance of Ms. Duan, the reporter and she went to buy blue heart radish vegetable stall. The stall owner is a more than 40 year old man. The so-called vegetable stall is actually a simple mobile stall. At this time, besides the onion, scallion and so on, there are dozens of radishes that look fresh.
in order to verify whether there will be blue heart radish again, the reporter decided to buy a look at the scene, so he randomly picked one on the vegetable stall. Then the reporter borrowed a knife from the stall, and cut the bought white radish peeled, and found that the heart of the radish was crystal clear, the color was very normal, and there was no blue heart.
booth owner told reporters that he had been selling vegetables for several years in Lang Maoshan, and the blue heart radish had never met before.
inspection shows no exclusion of pesticide residues in the afternoon of 9 days. In the afternoon, the reporter took the two pieces of the blue heart and radish samples from the lady's house to the commodity supervision and inspection center of Ji'nan industry and Commerce Bureau. The center is mainly responsible for the detection of commodity circulation in the provincial capital, and vegetables and fruits are important items for testing. "Blue heart radish, we haven't seen it before." The central surveyor told reporters that they had set up a quick test program, "testing the residue of radish pesticide, and seeing if there were any signs of chemical treatment."
according to the testing procedure, the inspectors took three samples of radish blue heart, radish root and head epidermis, each 5 grams, and soaked and stirred in the test bottle with distilled water.
13 minutes later, the result came out. The reporter noticed that on the pesticide fast test cards, the solvent was taken from the radish blue heart, radish root and head, showing pale blue. The test card with clear water shows dark blue. "The lighter the blue, the heavier the pesticide residues." The surveyor is introduced.
, do these test results indicate that there are pesticide residues in these blue radish? To this, inspector analysis, "do not exclude traces of pesticide residues, specific need for further testing and analysis."
according to the introduction, radish, garlic, onion, ginger and so on contain spicy and alkaloid components themselves. These ingredients inhibited the enzyme reaction and showed false positive results. "The blue of the test card may be caused by the components of the radish itself."
expert analysis
vegetable experts say it is relatively rare. It is recommended that we should be careful to eat
White Heart radish, which I have never seen before. The reporter consulted the Ji'nan agricultural supervision team, and a staff member said they had never received any response from the public about blue heart radish. As for why there are blue heart radish, we need further investigation.
however, a researcher surnamed Wang of the Vegetable Research Institute of Shandong Academy of Agricultural Sciences gave a detailed analysis to reporters. Researcher Wang specializes in vegetable research, especially radish research. "Blue heart radish is indeed relatively rare. It is recommended that residents who buy this kind of white radish should not eat easily." "It may be caused by hybridization or anthocyanin accumulation," she said.
if white radish and red heart radish pollen cross, it is possible to grow other colors of radish. But according to Wang research, what she knows is that there is almost no such hybridization in Ji'nan or even Shandong.
another possibility is anthocyanin accumulation. According to Wang, a pigment called "anthocyanin" in white radish can be blue and purple when it accumulates more. This is related to the pH value of the environment. If the environment is acidic, it will generally be red. If the environment is alkaline, it will be blue. For example, sometimes when people eat red radish, there will be blue and purple water on the knife, which is caused by the alkalinity of the environment.
in addition, Wang said, in addition to the above reasons, the emergence of blue heart white radish is not excluded from water pollution, soil pollution and other factors, cutting tools, tableware and other sanitary conditions used during the cutting may also lead to color changes. "The specific situation needs further analysis."