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Functionalized ionic liquids as an efficient sorbent for solid-phase extraction of tetracyclines in bovine milk

吸附剂 离子液体 牛乳 萃取(化学) 固相萃取 化学 色谱法 相(物质) 有机化学 吸附 催化作用
作者
Linh Dieu Nguyen,Nhi Hoang Nguyen,Mai Hoang Ngoc,The Thai Nguyen,Trinh Hao Nguyen,Chi Hua,Phuong Hoang Tran
出处
期刊:Microchemical Journal [Elsevier]
卷期号:204: 110999-110999
标识
DOI:10.1016/j.microc.2024.110999
摘要

In this research, a novel ionic liquid-based sorbent, N,N,N-trimethyl-3-(triethoxysilyl)propan-1-aminium bromide silica gel (SiO2-NH2), was successfully synthesized through chemical interaction. The synthesized adsorbent was first applied as a stationary phase for the preconcentration of tetracycline antibiotics (TCAs) at trace level from milk samples via solid-phase extraction. The structure of SiO2-NH2 was studied by Fourier-transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Energy-Dispersive X-ray Spectroscopy (EDX), and Scanning Electron Microscopy (SEM) to verify the successful synthesis based on the existence of ionic liquid on the surface of silica gel. The factors impacting a solid-phase extraction procedure were investigated, such as types of material, sample volume, breakthrough volume, and elution conditions. In addition, we also compared self-synthetic SPE cartridges with commercial cartridges with the assistance of LC-MS/MS. The SiO2-NH2 effectively retained and separated all three tetracycline antibiotics, including tetracycline (TC), oxytetracycline (OT), and chlortetracycline (CT), with a recovery efficiency of 99.4 % to 100 %. The maximum recovery was obtained when the analytes were eluted using a suitable mixture of acetonitrile, methanol, and acetic acid (2:2:1, v/v/v) for a volume of 1 mL. The enrichment factors of TC, OT, and CT were 110 mL, 150 mL, and 100 mL, respectively. The detection limits for TC, OT, and CT were 0.360, 0.279, and 0.390 mgL−1, corresponding with lower than 5 % relative standard deviation (RSD).
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