Glyoxal鈥揢rea鈥揊ormaldehyde Molecularly Imprinted Resin as Pipette Tip Solid-Phase Extraction Adsorbent for Selective Screening of Organochlorine Pesticides in Spinach

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• 作者：Chen Yang ; Tianwei Lv ; Hongyuan Yan ; Gaochan Wu ; Haonan Li
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2015
• 出版时间：November 4, 2015
• 年：2015
• 卷：63
• 期：43
• 页码：9650-9656
• 全文大小：491K
• ISSN：1520-5118

文摘

A new kind of glyoxal鈥搖rea鈥揻ormaldehyde molecularly imprinted resin (GUF-MIR) was synthesized by a glyoxal鈥搖rea鈥揻ormaldehyde (GUF) gel imprinting method with 4,4鈥?dichlorobenzhydrol as a dummy template. The obtained GUF-MIR was characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR) and applied as a selective adsorbent of miniaturized pipet tip solid-phase extraction (PT-SPE) for the separation and extraction of three organochlorine pesticides (dicofol (DCF), dichlorodiphenyl dichloroethane (DDD), and tetradifon) in spinach samples. The proposed pretreatment procedures of spinach samples involved only 5.0 mg of GUF-MIR, 0.7 mL of MeOH鈥揌₂O (1:1, v/v) (washing solvent), and 0.6 mL of cyclohexane鈥揺thyl acetate (9:1, v/v) (elution solvent). In comparison with other adsorbents (such as silica gel, C₁₈, NH₂鈥搒ilica gel, and neutral alumina (Al₂O₃鈥揘)), GUF-MIR showed higher adsorption and purification capacity for DCF, DDD, and tetradifon in aqueous solution. The average recoveries at three spiked levels ranged from 89.1% to 101.9% with relative standard deviations (RSDs) 鈮?7.1% (n = 3). The presented GUF-MIR-PT-SPE method combines the advantages of molecularly imprinted polymers (MIPs), GUF, and PT-SPE and can be used in polar solutions with high affinity and selectivity to the analytes in complex samples.