An update on the nutritional biochemistry oSeleniumand recent developments in Se bioavailabil ty t

摘要

Selenium exists in four oxidation states: elemental Se (SeO), selenide (Se-2), selenite (Se+4), and selenate (Se+6) in a variety of inorganic and organic matrices. The natural inorganic forms, selenite and selenate, account for the majority of total global selenium. Organically bound selenide compounds are predominantly seleno-amino acids; the principle chemical form of Se in animal tissues is selenocysteine, while selenomethionine predominates in plants.