Milk powder and milk/food parameter testing

Determination of residual amounts of streptomycin, dihydrostreptomycin, and kanamycin in milk powder and milk - Liquid chromatography-tandem mass spectrometry method - Scope 1: This standard specifies the liquid chromatography-tandem mass spectrometry method for the determination of residual amounts of streptomycin, dihydrostreptomycin, and kanamycin in milk powder and milk. This standard is applicable to the determination of streptomycin, dihydrostreptomycin, and kanamycin residues in milk powder and milk. The detection limit of the method in this standard is 10.0 ug/kg for streptomycin, dihydrostreptomycin, and kanamycin in milk, and 80.0 ug/kg for streptomycin, dihydrostreptomycin, and kanamycin in milk powder. 2 Normative references: The clauses in the following documents have become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB/T 6379.1 Accuracy (Accuracy and Precision) of Measurement Methods and Results Part I: General Principles and Definitions (GB/T 6379.1-2004, ISO 5725-1:1994, 1DT) GB/T 6379.2 Accuracy (Accuracy and Precision) of Measurement Methods and Results Part 2: Basic Methods for Determining the Repeatability and Reproducibility of Standard Measurement Methods (GB/T 6379.2-2004, ISO 5725-2-1994, 1DT) GB/T6682 Specification and Test Methods for Analytical Laboratory Water (GB/T6682-2008, ISO 36961987, MOD) 3 Principle: Antibiotics in milk powder or milk samples are extracted with phosphoric acid solution, protein is precipitated with trichloroacetic acid, and purified with benzene sulfonic acid and carboxylic acid solid phase extraction columns. Liquid chromatography-tandem mass spectrometry (ESI+) detection, quantitative analysis using external standard method

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