SS-EN-ISO-13904 › Animal feeding stuffs - Determination of tryptophan content (ISO 13904:2016)
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This International Standard specifies a method for determination of the total and free tryptophan (Trp) content in feeding stuffs (e.g. complete and complementary feeds, supplementary feeds, raw materials, ingredients, and concentrates) and determination of free tryptophan in commercial pure substances and premixtures containing more than 2 % of tryptophan.It does not distinguish between D- and L-forms.
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SS-EN ISO 13904:2016
March 14, 2016
EN ISO 13904:2016(IDT); ISO 13904:2016(IDT)