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ISO 13904:2016
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ISO 13904:2016 Animal feeding stuffs - Determination of tryptophan content
standard by International Organization for Standardization, 02/15/2016
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Full Description
ISO 13904:2016 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.