1. Introduction
Selenium is an essential trace element for human health. It fulfills
the role of an antioxidant, and also enhances the immunity of the
body [1,2]. However, different chemical forms of selenium determine
different metabolic processes, bioavailabilities and toxicities [3,4].
The inorganic forms are mostly selenite and selenate, while the
known organic forms are selenoamino acids, selenopeptides and
selenoproteins [5]. Compared with inorganic selenium, organic selenium
has higher bioavailability and can be more readily absorbed and is less
toxic [6,7].