After the spring
It's the annual "spring vegetable" tasting season again
Today
A pound of toon in Nanjing, Jiangsu Province, sold for 80 yuan
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Netizens also had a heated discussion about "whether toon is good or not"
Do you like to eat toon?
For toon,
How much do you know?
What is the nutrition of toon?
Toon is rich in potassium, calcium and magnesium, and the content of vitamin B is among the best in vegetables. Other studies have also found that toon is helpful in preventing chronic diseases, containing ingredients that inhibit a variety of pathogenic bacteria, as well as a fairly rich polyphenol antioxidant.
While introducing the nutritional value of toon, Ruan Guangfeng of the Food and Health Information Exchange Center of Kexin reminded consumers, "In fact, toon does not have such a magical effect, but it is just a seasonal vegetable with a unique taste, and it is eaten several times a year in the spring." ”
Toon is delicious, but danger lurks
Ruan Quang Feng emphasized: "There is a dangerous molecule lurking in the delicious toon - nitrite. ”
Why is there nitrite in toon? Ruan Quang Feng said that plants need nitrogen fertilizer when growing, nitrogen is a widely existing element in nature, plants absorb nitrogen in the environment, through complex biochemical reactions to eventually synthesize amino acids. In this process, the production of nitrate is an inevitable step. There are also some reductase enzymes in plants, which will reduce a part of the nitrate to nitrite. Virtually all plants contain nitrates and nitrites.
Nitrite is toxic. Toxicological analysis showed that nitrite has a certain acute toxicity, and in caries, its semi-lethal amount is 57 mg/kg. Moreover, it also increases the risk of cancer because nitrites react with protein breakdown products under acidic conditions to produce nitrosamines, which are recognized carcinogens.
Although the content of nitrite in most toons is not harmful, some toons have high nitrite content. There have been cases of nitrite poisoning due to the consumption of toon.
Before eating the toon, blanch it with boiling water
Since toon contains nitrites, can it still be eaten? Ruan Guangfeng introduced that before eating toon, as long as it is scalded with hot water, most of the nitrite can be removed.
An experimental data from a research institute showed that the nitrite content of fresh toon samples was 0.2 to 0.4g/kg, and after blanching for one minute, it dropped to 0.02 to 0.05g/kg, and after one minute of blanching, the nitrite content decreased by more than 85%.
Ruan Guangfeng reminds everyone that when choosing toon, try to choose young buds and eat them when they are the freshest, because at this time, toon buds contain less nitrate and nitrite.
Yunnan Net (ID: yunnancn) is synthesized from CCTV Finance, China Economic Net, and Weibo Commentary
Edit: Zhai Xinran