Published
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.
WITHDRAWN
SRPS EN ISO 13904:2010
PUBLISHED
SRPS EN ISO 13904:2017
60.60
Standard published
Jun 26, 2017