Objective To obtain optimal extracting conditions suitable for the quantitative assay of MSeC in Se-enriched Aliium vegetables with on-line high-performance liquid chromatography-electron spray tandam mass spectrometry (LC-MS/MS).

A Comparison of Electrochemical Behavior between Selenocystine and Selenomethionine with Cyclic Voltammetry;

Electrochemical Behavior of Selenocystine at Silver Electrode and Its Analytical Application;

Electrochemical Reaction of Cytochrome c at Selenocystine Self-assembled Monolayers Modified Electrodes

The discovery of codon character of selenocysteine as the 21st natural amino acid and the identification of new selenoproteins based on the character of SECIS by bioinformatics are also reviewed.

As the twenty first amino acid, selenocysteine can be co translationally incorporated into the polypeptide chain at UGA codon in the coding region of selenoprotein mRNA.

In selenoproteins, Se is incorporated into proteins in the form of selenocysteine (Sec), the 21st amino acid.

The sequence of the cloned cDNA contains 10 UGA codon in the open reading frame of mRNA Selenocysteine is incorporrated into the primary structure of the protein at a UGA codon .

Since selenocystein, the active center of the selenoprotein, is translated in response to UGA codon (a stop signal in the canonical genetic code), selenoproteins are misannotated or completely lost by general program.