DS DS/EN ISO 13904
DS DSEN SO 13904 2005-JUL-06 Anmal feedng stuffs - Determnaton of tryptophan content
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This standard describes the determination of the total and free tryptophan in feeding stuffs (e.g. complete and complementary feeds, supplementary feeds, raw materials, ingredients, premixtures and concentrates). It does not distinguish between D- and L-forms.