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Solid-phase extraction coupled with switchable hydrophilicity solvent-based homogeneous liquid-liquid microextraction for chloramphenicol enrichment in environmental water samples: a novel alternative to classical extraction techniques.
Analytical and Bioanalytical Chemistry 2018 December 13
A simple and efficient method combining solid-phase extraction (SPE) with homogeneous liquid-liquid microextraction (HLLME) has been developed for fast pretreatment of chloramphenicol (CAP) from water samples prior to determination by high-performance liquid chromatography-ultraviolet detection. Oasis HLB sorbent was chosen for SPE. In HLLME, N,N-dimethylcyclohexylamine was used as a CO2 -triggered switchable solvent that could switch reversibly between hydrophilic and hydrophobic forms. The parameters influencing both SPE and HLLME were investigated and optimized. Under the optimal conditions, the method exhibited low limit of detection (0.1 ng/mL), good linearity (0.5-50 ng/mL), acceptable precision (RSD <5.0%) and accuracy (RE <4.0%). An enrichment factor of 340 was obtained. The proposed method is simple, fast, cost-effective, and suitable for the determination of trace chloramphenicol in water matrices. Graphical abstract ᅟ.
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