It's spring again, and it's time for Toona sinensis to go on the market. Toona sinensis bud is the fresh bud of Toona sinensis in spring. Because it grows on the treetop, it is often called "vegetable on the tree". Its unique taste makes many people deeply infatuated, and the price rises as a result. For example, in some vegetable markets in Shanghai recently, the price of Toona sinensis even rose to about 120 yuan a kilogram. Chinese toon is so expensive. Is there any special nutrition? Today, let's talk about Toona sinensis, a seasonal vegetable for the occasion. Toona sinensis is of nutritional value Pretty good vegetables Toona sinensis is also known as Toona sinensis bud, Toona sinensis stake head, Toona sinensis, etc. The special flavor of Toona sinensis comes from its special volatiles, including terpenoids, sesquiterpenoids and other substances. It is precisely because of this special fragrance that people who like Chinese toon will eat Chinese toon every spring, and those who don't like it will avoid it. Chinese toon is so expensive. Does it have any special nutrition? Toona sinensis is a kind of vegetable with good nutritional value. Toona sinensis is rich in potassium, calcium and magnesium, and the content of vitamin B group is also among the best in vegetables. Some studies also found that Toona sinensis is helpful to prevent chronic diseases, which contains ingredients that inhibit a variety of pathogenic bacteria and is quite rich in polyphenol antioxidants. However, many articles say that Toona sinensis has various health care functions, such as anti-tumor, reducing blood lipid and blood sugar, which is somewhat exaggerated. In fact, Toona sinensis is just a seasonal vegetable with unique taste. I eat it several times a year in spring. I don't eat much each time. I can't talk about any special effect. Toona sinensis delicious But it contains nitrite Although delicious Chinese toon always makes people who love it willing to empty their wallets, you know, there is often a dangerous molecule - nitrite in delicious Chinese toon. Why is there nitrite in Toona sinensis? We know that plants need nitrogen fertilizer when they grow. Nitrogen is a widely existing element in nature. Plants absorb nitrogen in the environment and finally synthesize amino acids through complex biochemical reactions. In this process, the production of nitrate is an inevitable step. There are also some reductases in plants, which will reduce part of nitrate to nitrite. In fact, all plants contain nitrate and nitrite. Nitrite is toxic. Toxicological analysis showed that nitrite had certain acute toxicity, and its half lethal dose to caries animals was 57 mg / kg. Moreover, it also increases the risk of cancer, because nitrite reacts with protein decomposition products under acidic conditions, which is easy to produce nitrosamines, which are recognized as carcinogens. Before eating Toona sinensis Blanch with boiling water first The good news is that before eating Toona sinensis, you can remove most of the nitrite by scalding it with hot water. For example, studies have shown that when scalding Toona sinensis, about 80% of nitrite can be removed in 30 seconds and 83.86% of nitrite can be removed in 45 seconds. Therefore, when eating Chinese toon, you must blanch it with boiling water for 30-40 seconds. In addition, it is also reminded that when selecting Toona sinensis, try to choose tender buds and eat them when they are the freshest, because at this time, Toona sinensis buds contain less nitrate and nitrite. (outlook new era)
Edit：Yuanqi Tang Responsible editor：Xiao Yu
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