This method is for the quantitative determination of free (non-protein-bound) amino acids in commercial products and premixtures containing more than 10 % of the respective amino acid. It does not distinguish between D-and L-forms.
DS/EN ISO 17180:2013 history
2013DS/EN ISO 17180:2013 Animal feeding stuffs - Determination of lysine, methionine and threonine in commercial amino acid products and premixtures