l alloisoleucine

L-Alloisoleucine (L-allo-Isoleucine) is a branched chain amino acid and is a stereoisomer of L-isoleucine. It is a common constituent of human plasma (albeit at low levels). L-alloisoleucine is produced as a byproduct of isoleucine transamination. Plasma L-alloisoleucine, which is derived from L-isoleucine in vivo, can be used for the diagnosis of maple syrup urine disease (MSUD), a genetic disorder. Indeed, plasma L-alloisoleucine levels above 5 μmol/L is the most specific and most sensitive diagnostic marker for all forms of MSUD.

Fmoc-N-methyl-L-alloisoleucine is a peptide synthesis building block designed for incorporating N-methyl-isoleucine residues.

(rac)-Isoleucine is a racemic mixture of Isoleucine diastereomers (L-isoleucine, L-alloisoleucine, D-isoleucine, D-alloisoleucine). L-Isoleucine, a branched-chain amino acid, functions in nitrogen donation, glucose/fatty acid metabolism, and immune regulation. L-Alloisoleucine derives from L-Isoleucine transamination.