M00008275
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ISO 13904:2005 [ Withdrawn ] Animal feeding stuffs - Determination of tryptophan content
standard by International Organization for Standardization, 05/01/2005
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Availability date: 2021-11-25
ISO 13904:2005 describes the determination of the total and free tryptophan in feeding stuffs. It does not distinguish between D-and L-forms.