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Ultrasound/microwave‐assisted solid–liquid–solid dispersive extraction with high‐performance liquid chromatography coupled to tandem mass spectrometry for the determination of neonicotinoid insecticides in Dendrobium officinale
Authors:Shuilian Zheng  Zuguang Li  Jianmei Wang  Hu Zhang  Mingrong Qian
Affiliation:1. Department of Pharmacy, Zhejiang Provincial People's Hospital, Hangzhou, China;2. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, China;3. MOA Key Lab for Pesticide Residue Detection, Institute of Quality and Standard for Agro‐products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
Abstract:A one‐step ultrasound/microwave‐assisted solid–liquid–solid dispersive extraction procedure was used for the simultaneous determination of eight neonicotinoids (dinotefuran, nitenpyram, thiamethoxam, clothianidin, imidacloprid, acetamiprid, thiacloprid, imidaclothiz) in dried Dendrobium officinale by liquid chromatography combined with electrospray ionization triple quadrupole tandem mass spectrometry in multiple reaction monitoring mode. The samples were quickly extracted by acetonitrile and cleaned up by the mixed dispersing sorbents including primary secondary amine, C18, and carbon‐GCB. Parameters that could influence the ultrasound/microwave‐assisted extraction efficiency such as microwave irradiation power, ultrasound irradiation power, temperature, and solvent were investigated. Recovery studies were performing well (70.4–113.7%) at three examined spiking levels (10, 50, and 100 μg/kg). Meanwhile, the limits of quantification for the neonicotinoids ranged from 0.87 to 1.92 μg/kg. The method showed good linearity in the concentration range of 1–100 μg/L with correlation coefficients >0.99. This quick and useful analytical method could provide a basis for monitoring neonicotinoid insecticide residues in herbs.
Keywords:Dendrobium officinale  Microwave‐assisted extraction  Neonicotinoid insecticides  Solid–  liquid–  solid dispersive extraction  Ultrasound‐assisted extraction
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