《Table 3 Contents of veterinary drugs in chilled pork samples from three different sources》

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《市售冷鲜肉的品质与安全的系统性调研——基于农贸市场、大型超市和电商平台3种主要销售渠道（英文）》

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ND:not detected.The measurements of chilled pork samples were based on wet weight

The veterinary drug residues of chilled pork samples from the three different sources were presented in Table 3，including three groups:tetracyclines（oxytetracycline，chlortetracycline，and tetracycline），sulfonamides（total），andβ-agonists（clenbuterol，ractopamine，and salbutamol）.The maximum residue limits of veterinary drug in pork were based on the Chinese Agricultural Industry Standard NY/T632-2002（MARA，2002）.The levels of detected veterinary drugs in chilled pork samples were all below the limit of detection，indicating that all samples were in line with the industry standard in the veterinary drug residues.Tian et al.（2016）developed a novel ultra-HPLC-MS/MS approach for detection of 46 veterinary drugs and analyzed 30 pork samples and 20 beef samples obtained from Beijing local markets using this method.No veterinary drug residue was detected among the 50 commercial samples，except enrofloxacin in one pork sample and sulfadimethoxine in one beef sample.Regarding the veterinary drug residues of pork from two provinces in Vietnam，Hung Yen and Nghe An，tetracyclines were not present in pork samples，but 50%（9/18）and 5%（1/18）samples were positive for sulfonamides andβ-agonists，respectively（Tuyet-Hanh et al.，2017）.