This standard specifies the high-performance liquid chromatography and spectrophotometry for determining the tryptophan content in feed. This standard applies to the determination of tryptophan in feed ingredients, compound feed, concentrated feed, and concentrate supplements. The limit of quantitation for high-performance liquid chromatography is 0.02%; when the maximum sample weight is 700 mg and the hydrolysate is diluted 25 times, the limit of quantitation for spectrophotometry is 0.04%.
Basic Data
Standard ID
GB/T 15400-2018 (GB/T15400-2018)
Description (Translated English)
Determination of tryptophan in feeds
Sector / Industry
National Standard (Recommended)
Classification of Chinese Standard
B46
Classification of International Standard
65.120
Word Count Estimation
10,117
Date of Issue
2018-09-17
Date of Implementation
2019-04-01
Older Standard (superseded by this standard)
GB/T 15400-1994
Issuing agency(ies)
State Administration for Market Regulation, China National Standardization Administration
