Selenium is an essential trace element for human body. Selenium participates in the synthesis of various selenium-containing enzymes and selenium-containing protein in human body. Among them, glutathione peroxidase catalyzes the conversion of hydroperoxide or lipid peroxide into water or various alcohols in organisms, eliminating the attack of free radicals on biofilm and protecting biofilm from oxidative damage; Selenium participates in the formation of iodothyronine deiodinase.
Selenium can improve human immunity, promote lymphocyte proliferation and synthesize antibodies and immunoglobulins. Selenium has obvious inhibitory and protective effects on colon cancer, skin cancer, liver cancer, breast cancer and other cancers, and its intermediate metabolite methyl enol in the body has strong anticancer activity.
Nutrients such as selenium, vitamin E, allicin, linoleic acid, germanium and zinc have synergistic antioxidant effect and increase antioxidant activity. At the same time, selenium can reduce and alleviate the toxicity of heavy metals.
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The discoverer, Jans Jacob Betzelius (J&; OumlNsJakobBerzelius) and named it Selene, which means the moon in Greek.
Year of discovery: 18 17.
Discovery process: 18 17. Bethelius of Sweden made selenium from the red powdery substance at the bottom of the lead room of a sulfuric acid plant. He also found allotropes of selenium. He reduced the oxide of selenium to obtain orange amorphous selenium; Slowly cooling molten selenium to obtain gray crystal selenium.
Let selenide decompose naturally in the air to obtain black crystal selenium. Selenium is a multifunctional life nutrient, which is commonly used in more than 40 diseases such as cancer, Keshan disease, Kaschin-Beck disease, cardiovascular disease, diabetes, liver disease, prostate disease, heart disease and cancer, and is widely used in cancer, surgery, radiotherapy and chemotherapy.
Selenium can be divided into plant active selenium and inorganic selenium. Inorganic selenium generally refers to sodium selenite and sodium selenite, including yeast selenium and malt selenium with a large amount of inorganic selenium residue. It is obtained from the by-products of metal deposits. Inorganic selenium is toxic and difficult to absorb, so it is not suitable for people and animals to eat.
Plant active selenium is combined with amino acids through biotransformation, and generally exists in the form of selenomethionine. Plant active selenium is an allowable selenium source for human beings and animals.
The scientific and technological level of plant active selenium mainly depends on the absorption and utilization rate of human body. From this point of view, selenium independently developed in China is more suitable for human absorption than selenium abroad.
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