Veterinary drug residue/veterinary drug residue detection

This standard specifies the determination method of clenbuterol in animal foods. This standard is applicable to the determination of clenbuterol residues in fresh or frozen livestock, poultry meat, viscera, and their products. This standard is also applicable to the determination of clenbuterol in biological materials (human or animal blood, urine). The detection limit of this method; The method of gas chromatography-mass spectrometry is 0.5pg/kg; The second method is 0.5pug/kg by high-performance liquid chromatography; The third method, enzyme-linked immunosorbent assay, is 0.5 ug/kg. Linear range; The first method, gas chromatography-mass spectrometry, is 0.025 ng~2.5 ng; The second method, high-performance liquid chromatography, is 0.5 ng~4 ng; The third method, enzyme-linked rabbit plague method, involves cutting solid samples from 0.004 ng to 0.054 ng-2 principles and homogenizing them with perchloric acid solution. Add perchloric acid solution to the liquid sample for ultrasonic heating extraction, extract with isopropanol+ethyl acetate (40+60), concentrate the organic phase, separate with a weak cation exchange column, elute with ethanol+concentrated ammonia water (98+2) solution, and concentrate the eluent. After derivatization with N.O-bis trimethylsilane trifluoroacetamide (BSTFA), determine it on a gas chromatography-mass spectrometry. Quantitative analysis using metoprolol as the internal standard. 3 reagents 3.1 clenbuterol hydrochloride, with a purity of ≥ 99.5%. 3.2 Metoprolol, purity ≥ 99%. 3.3 Sodium dihydrogen phosphate. 3.4 Sodium hydroxide. 3.5- Sodium chloride. 3.6 Perchlorate. 3.7 Concentrated ammonia water. 3.8 Isopropanol. 3.9 Ethyl acetate. 3.10 Methanol: HPLC grade. 3.11 Toluene; Chromatographic purity. 3.12 Ethanol. 3.13 Derivative agent: N, O-bis (trimethylsilane) trifluoroacetamide (BSTFA). 3.14 Perchlorate solution (0.1 mol/L). 3.15 Sodium hydroxide solution (1 mol/L). 3.16 Sodium dihydrogen phosphate buffer solution (0.1 mol/L, pH 6.0). 3.17 Isopropanol+ethyl acetate (40-60). 3.18 Ethanol+concentrated ammonia water (98+2). 3.19 Metoprolol Internal Standard Solution: Accurately weigh the Metoprolol standard, dissolve it in methanol to prepare an internal standard stock solution with a concentration of 240 mg/L, store it in a refrigerator, and dilute it with methanol to form an internal standard solution of 2.4 mg/L during use. 3.20 Clenbuterol standard solution: Accurately weigh the clenbuterol standard, dissolve it in methanol to prepare a standard stock solution with a concentration of 250 mg/L, store it in a refrigerator, and dilute it with methanol to 0.5 mg/L of clenbuterol standard solution during use

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