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ISO 17180:2013
M00005559
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ISO 17180:2013 Animal feeding stuffs - Determination of lysine, methionine and threonine in commercial amino acid products and premixtures
standard by International Organization for Standardization, 04/15/2013
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ISO 17180:2013 specifies a method for the quantitative determination of free (non-protein-bound) lysine, methionine, and threonine in commercial products and premixtures containing more than about 10 % mass fraction of the respective amino acid. It does not distinguish between d- and l-forms.