Summary _ mineral of selenium

Summary _ mineral of selenium

Brief introduction of selenium
Selenium is the rare element of atomic content in the earth's crust, distributed and dispersed very much, the natural selenium ore that has not concentrated on is for industry to exploit. The atomic number of selenium is 34, the atomic weight is 78.96, it is by six
A natural stable isotope that exists makes up, in six kinds of solids and plain different physique that has already known, three kinds of crystal ( 's form italic, 's form italic, and ashy trigonometry is brilliant) It is the most important. Also exist in solid form of three kinds of non- brilliant attitudes. In selenium spread all over the human body every histoorgan and humoral, selenium is the tallest in density in the kidney, the liver takes second place, it is relatively a bit lower in the blood. Selenium in the muscle accounts for half of total selenium quantity of the human body. Muscles, the kidney, liver and blood are that the tissue of selenium store the storehouse. Selenium form, suck the intersection of selenium and albumen and containing seleno enzyme composition in human body, anti-oxidant, keep the normal immunological function, keep and bears a great deal of function such as the function normally.
Discovery of selenium
Cypress, chemist of Swedish, quarry the intersection of profit and dark Sri Lankan at studying the intersection of sulfuric acid and the intersection of factory and the intersection of lead and red silt property that precipitate under room 1817 year, find it one new element that property similar to hoof, the moon of Israel Greek goddess fill name to rein in the alunite in, named as selenium immediately. The understanding of selenium of the biological educational circles started in 1934. Schwarz K and Foliz CM of Germany delivered the report with animal's trophic action of selenium for the first time in 1957. Selenium is animal and the human body this understanding of essential microelement is one of the most important discoveries on nutrition in the second half of the 20th century. It knows selenium to be human body essential another main basis of microelement 1979 the intersection of Keshan and disease that our country deliver prevent and cure the research results.
Food source
At food selenium change greatly content measured value,for example (with fresh to count again) : Viscera and marine product 0.4-1.5mg/kg; Red meat 0.1-0.4mg/kg; Grain 0.1-0.8mg/kg; Milk product 0.1-0.3mg/kg; Fruit vegetables 0.1mg/kg.
The supersession is absorbed
The intersection of selenium and internal to absorb, transship, discharge, store and distribute, will influence by a lot of external factors. It is mainly chemical form and quantity of selenium in meal. I gender, age, health status in addition, and compounds such as sulphur, heavy metal, vitamin have influence in the food. Animal experiment make it known selenium is absorbed in the duodenum mainly, jejunum and ileum are slightly absorbed, the stomach is not absorbed. Accounted for 50%-60% that selenium listed quantity by selenium that the urine discharges, while taking in high meal selenium, the discharging amount of urine seleno will increase, reduce on the contrary, the kidney plays a regulating role.
Physiological function
1.Form and include selenium albumens and composition containing seleno enzyme.
2.Resist the oxidation: Selenium is several necessary components which resist the oxidase, it passes and dispels lipid peroxide, block active oxygen and pathogenic function of free radical, and get up and slow aging and even prevent some chronic disease.
3.Regulating action to hormone of thyroid gland.
4.Maintain the normal immunological function: Suitable selenium level, for keeping cell immunity and humoral immunity essential.
5.Prevent and lack relevant endemic disease with selenium.
6.Antitumor function.
7.Resist AIDS function: Mending selenium in the mechanism that can slow down the AIDS process and death roughly has three respects: Resist the oxidation, control HIV virus to appear and develop, regulate cells and the humoral immunity in order to increase to resist infecting ability.
8.Keep bearing the function normally.
Need crowds
Men need more selenium, because supply internal selenium and concentrate on the genitals mostly, and can discharge outside the body together with seminal fluid. Live in high to pollute resident of area, live in poor the intersection of selenium and resident of district.
Physical needs
The intaking amount of recommendation over 18 of " the meal nutrient of Chinese resident consulted the intaking amount " made in 2000 person is 50ug/d, it is 400ug/d to tolerate the supreme intaking amount.
Excessive to behave
The nail changes thick, hair to loss, the limb is numb in end, hemiplegia.
Selenium deficiency disease
1.It will cause becoming old and weak before one's age to lack selenium.
2.It will initiate myocardium disease and myocardial failure to lack selenium seriously.
3.Keshan disease takes place, Kaschin-Beck.
4.Spirit is dispirited, sperm's vigor drops, it is apt to catch a cold.


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