3 Animal derived food testing

1. Scope: This standard specifies the method for determining the residues of oxytetracycline, tetracycline, and aureomycin in livestock and poultry meat. This standard is applicable to the determination of oxytetracycline, tetracycline, and chlortetracycline residues in various livestock and poultry meat. The detection limit of this standard is 0 15 mg/kg. Tetracycline 0 20 mg/kg. Chloramphenicol 0 The 65 mg/kg. 2 principle sample is extracted, filtered by a microporous filter membrane, and directly injected into the sample. The sample is separated by reverse phase chromatography and detected by a UV detector, and compared with the standard for quantification. The peak order is soil mold, tetracycline, and gold mold. Standard addition quantification. 3 Reagent 3.1 Acetonitrile (analytical pure). 3.2 0 01 mol/L sodium dihydrogen phosphate solution: Weigh 1 Dissolve 56 g (accurate to 0.01 g) of sodium dihydrogen phosphate (NaH2PH, ● 2H. O) in distilled water. Bring to a constant volume of 100 mL and pass through a microporous membrane (0 forty-five μ m) Filter and reserve. 3.3 Standard solution of soil element (TC): Weigh 0.0100 R (accurate to 0.000 1 g) of soil element, dissolve it in 0.1 mol/L hydrochloric acid solution and make a constant volume of 10 00 mI. This solution contains 1 mg of oxytetracycline per milliliter. 3.4 Tetracycline (TC) standard solution: Weigh 0.0100 g of tetracycline (accurate to ± 0.001 g) and use 0 01 mol/I Dissolve hydrochloric acid solution and bring to a constant volume of 10.00 mL. This solution contains 1 mg of tetracycline per milliliter. 3.5% CTC standard solution: Weigh 0.0100 g of aureomycin (accurate to 0.000 1 g). Dissolve in distilled water and bring to a constant volume of 10.00 mL. This solution contains 1 mg of aureomycin per milliliter The above standard products are converted at 1000 units/mg. 3.8-3.5 solutions should be stored at temperatures below 4C and can be used for one week. 3.6 Mixed standard solution: Take 1.00 mL of 3.3.3.4 standard solution and 2.00 mL of 3.5 standard solution, respectively. Place them in a 10 ml volumetric flask and add distilled water to the mark. This solution contains 0.1 mg of oxytetracycline, 0.1 mg of tetracycline, and 0.2 mg of chlortetracycline per milliliter. It should be prepared immediately before use. 3.7 5% high gas acid solution

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