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See Chinese contents: GB 5009.294-2023 GB 5009.294-2023: National food safety standard - Determination of tryptophan in foods
This standard specifies the determination method of tryptophan in food. This standard is applicable to the determination of tryptophan in formula foods for infants and young children, formula foods for special medical purposes, and cereal supplementary foods for infants and young children. Method A - Enzymatic hydrolysis-liquid chromatography
