Residue detection of other veterinary drugs

This standard specifies the sample preparation and liquid chromatography detection methods for the detection of avermectin in fruits and vegetables. This standard is applicable to the detection of abamectin residues in apples and spinach. Other foods can be referred to for implementation

The following normative references are essential for the application of this document. For 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 2763 National Food Safety Standard: Maximum Residue Limits of Pesticides in Food GB/T 6682 Specification and Test Methods for Analytical Laboratory Water GB/T 6682 Method Abstract: Avermectin in the sample was extracted with acetone, concentrated, purified with SPEC, column, and eluted with methanol. After concentration, constant volume, and filtration, the eluent was determined by high-performance liquid chromatography equipped with a UV detector, and quantified by the external standard method. Unless otherwise specified, all reagents and materials are analytical pure, and water is grade one water in accordance with GB/T 6682. 4.1 Reagent 4.1.1 Acetone (C, H, O): Chromatically pure. 4.1.2 Methanol (CH, O): Chromatically pure. 4.2 Standard substance Avermectin standard substance (molecular formula C.sHO): purity ≥ 96.0%. 4.3 Preparation of standard solution 4.3.1 Avermectin standard stock solution: Weigh 0.1 g (accurate to 0.000 1 g) of Avermectin standard into a 100 mL volumetric flask, dissolve it in methanol, and prepare a standard stock solution with a concentration of 1.0 mg/mL to the mark. 4.3.2 Avermectin standard working solution: Take an appropriate amount of Avermectin standard stock solution as needed, and dilute it with methanol to an appropriate concentration of standard. Standard working fluid needs to be prepared once a week. 5 Instruments and Equipment 5.1 High Performance Liquid Chromatography; Equipped with UV detector. 5.2 Analytical balance; Sensitivity 0.01 g and 0.000 1 g. 5.3 tissue crusher. 5.4 Oscillator. 5.5 Rotating evaporator. 5.6 Solid phase extraction column: SPE CR. Specification: 3 mL/60 mg, activated with 5 mL methanol and 5 mL water before use

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