Determination of sulfur-containing amino acids in goat milk powder by amino acid analyzer and uncertainty evaluation

Authors

LI Lu, Fuping County Inspection and Testing Center , Fuping , Shaanxi 711799 , China ;Shaanxi Goat Milk Product Quality Supervision and Testing Center , Fuping , Shaanxi 711799 , China
LIU Dan, Fuping County Inspection and Testing Center , Fuping , Shaanxi 711799 , China ;Shaanxi Goat Milk Product Quality Supervision and Testing Center , Fuping , Shaanxi 711799 , China
QIANG Xin, Fuping County Inspection and Testing Center , Fuping , Shaanxi 711799 , China ;Shaanxi Goat Milk Product Quality Supervision and Testing Center , Fuping , Shaanxi 711799 , China
WANG Lin, Fuping County Inspection and Testing Center , Fuping , Shaanxi 711799 , China ;Shaanxi Goat Milk Product Quality Supervision and Testing Center , Fuping , Shaanxi 711799 , China
ZHANG Huafeng, International Joint Research Center of Shaanxi Province for Food and Health Sciences , Shaanxi Normal University , Xi'an, Shaanxi 710119 , China ;College of Food Engineering and Nutritional Science , Shaanxi Normal University , Xi'an, Shaanxi 710119 , ChinaFollow

Corresponding Author(s)

张华峰（1975—），男，陕西师范大学教授，博士。E-mail：isaacsau@sohu.com

Abstract

[Objective] To evaluate the uncertainty during the determination of sulfur-containing amino acids in goat milk powder by an amino acid analyzer. [Methods] The mathematical model and fishbone diagram of the uncertainty source are established to analyze and quantify the introduced uncertainty components. Then, the combined uncertainty and extended uncertainty are calculated. [Results] When the mass fractions of cystine, cysteine, and methionine are 0.305, and 0.338 g/100 g, the extended uncertainty is 0.022, and 0.023 g/100 g, respectively (k=2). [Conclusion] The uncertainty of this method mainly comes from the weighing of standard material and samples, as well as the preparation of the standard series working solution, which should be strictly controlled during sample testing.

Publication Date

11-19-2025

First Page

34

Last Page

42

DOI

10.13652/j.spjx.1003.5788.2025.80039

Recommended Citation

Lu, LI; Dan, LIU; Xin, QIANG; Lin, WANG; and Huafeng, ZHANG (2025) "Determination of sulfur-containing amino acids in goat milk powder by amino acid analyzer and uncertainty evaluation," Food and Machinery: Vol. 41: Iss. 10, Article 5.
DOI: 10.13652/j.spjx.1003.5788.2025.80039
Available at: https://www.ifoodmm.cn/journal/vol41/iss10/5

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