Publications by authors named "Daifeng Yang"
Polycyclic aromatic hydrocarbons (PAHs) represent a category of persistent organic pollutants that pose a global concern in the realm of food safety due to their recognized carcinogenic properties in humans. Food can be contaminated with PAHs that are present in water, air, or soil, or during food processing and cooking. The wide and varied sources of PAHs contribute to their persistent contamination of food, leading to their accumulation within these products.
View Article and Find Full Text PDFA simple, rapid, and reliable method based on dispersive solid-phase extraction (d-SPE) and gas chromatography-mass spectrometry (GC-MS) was developed for quantitating polychlorinated biphenyls (PCBs) in vegetable samples. Parameters affecting both the extraction yields and cleanup efficiency, including the type and volume of extraction solvent, extraction time, type and volume of cleanup sorbent, and cleanup time, were optimized. Matrix effects were evaluated, and matrix-matched calibration was recommended.
View Article and Find Full Text PDFArticle Synopsis
- A new method using gas chromatography-mass spectrometry (GC-MS) combined with dispersive solid-phase extraction (dSPE) was developed for quickly detecting 18 types of polychlorinated biphenyls (PCBs) in tea samples.
- The process involved extracting PCBs from tea with a hexane-acetone mixture, purifying the samples using specialized sorbents, and confirming PCB presence and concentration through specific chromatographic techniques.
- The method showed high accuracy and sensitivity, with linearity for PCB detection up to 500 μg/kg, and recovery rates between 90.7% and 115.2% across different tea types, making it effective for quality control in tea consumption.