Veterinary drugs are widely used in animal husbandry to prevent and treat animal diseases, to promote animal growth, and to improve the conversion rate of feed. However, the use of veterinary drugs in food-producing animals may leave residues of the parent compounds, and/or their metabolites in food products resulting in harmful effects to humans. To ensure food safety, sensitive and effective analytical methods have been developing rapidly. So it is necessary to make a systematic summary of detection methods of veterinary drug residues. Sample preparation methods and analytical techniques are the two main parts of analyzing veterinary drug residues which were described in detail. Sample preparation methods, such as solid-phase extraction, liquid–liquid extraction, immunoaffinity chromatography, and QuEChERS, were summarized by the specific examples. The three types of methods, microbial, immunological, and physicochemical methods, for screening or determination were described, including microbial inhibition, enzyme-linked immunosorbent assay, colloidal gold immunoassay, fluorescence polarization immunoassay, biosensor technology, application of quantum dots, capillary electrophoresis, liquid chromatography, and liquid chromatography-mass spectrometry. In addition, the advantages and shortcomings of methods were also described. The challenges and prospects were discussed for the analysis of veterinary drug residues in animal-derived foods.

Polycyclic aromatic hydrocarbons (PAHs) are one species of persistent organic pollutants (POPs) with strong carcinogenicity and teratogenicity. They can be widely found in the environment, which cause great harm to the ecological environment. In addition, they endanger human health by polluting food from the natural environment and food processing. Therefore, it is necessary to accurately detect PAHs in various sample matrices, which requires the accurate, practical and rapid detection methods. This review aims to investigate the progress of research methods for PAHs, including pretreatment methods and detection methods. A summary analysis of different methods is performed by searching the literature on numerous methods for detecting PAHs published in various journals. There are many pretreatment methods for PAHs, such as solid phase extraction (SPE), cloud point extraction (CPE) and so on. The most commonly used methods for detecting PAHs are high-performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS). Spectrophotometry, chromatography and chromatography-mass spectrometry have been used more frequently owing to their accuracy and convenience. At the same time, some immunological methods, such as immunosensormethods, enzyme-linked immunosorbent assays (ELISA), immunofluorescence, etc. are also widely used.