Detection of animal residue parameters

1 Scope: This standard specifies the sample preparation and liquid chromatography mass spectrometry/mass spectrometry determination methods for the determination of drug residues in animal derived foods, such as mefenomycin, flumefenicol, and flufenicol. This standard is applicable to the detection of residual levels of metformin, flufenamycin, and flufenicomide in pork, chicken, fish, shrimp, pig liver, pig kidney, casing, honey, and milk. The following normative references are essential for the application of this document. For all dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 6682 Analytical Laboratory Water Specifications and Test Methods 3 Method Principle: The sample is extracted with ammoniated ethyl acetate, and protein is precipitated with trichloroacetic acid in milk. After adjusting the pH of the solution to neutral, it is extracted with ammoniated ethyl acetate, purified with C, a solid-phase extraction column, liquid chromatography-mass spectrometry, mass spectrometry, and external standard method for quantification. Unless otherwise specified, all reagents and materials used are analytical grade. Water is grade one water that meets the requirements of GB/T 6682. 4.1 Ethyl acetate. 4.2 Methanol. 4.3 Formic acid. 4.4 Trichloroacetic acid. 4.5 Anhydrous sodium sulfate: Burn at 650 ℃ for 4 hours, cool to room temperature in a dryer, and store in a sealed bottle for future use. 4.6 Ammonia: The content is 25%~28%. 4.7 Sodium hydroxide. 4.8 Sodium chloride. 4.9 Ammoniated ethyl acetate (3+97): Measure 3 mL of ammonia and 97 mL of ethyl acetate, and mix well. 4.10 Sodium chloride solution (1.5 g/L): Weigh 15 g of sodium chloride, dissolve in water, and dilute to 100 mL. 4.11 5 mol/L sodium hydroxide solution: Weigh 20 g of sodium hydroxide and dilute to 100 mL with water. 4.12 Trichloroacetic acid solution (1000 g/L): Weigh 100 g of trichloroacetic acid, dissolve in water, and dilute to 100 mL. 4.13 Standards: thiamphenicol (C: H: CI; NO, S.CAS No. 15318-45-3), flufenicol. CHNO, CI. SF, CAS No. 76639-94-6), flufenicol amine, Cyo HFNO, s

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