3 years ago

Improving the Sensitivity of Solid-Phase Microextraction by Reducing the Volume of Off-Line Elution Solvent

Improving the Sensitivity of Solid-Phase Microextraction
by Reducing the Volume of Off-Line Elution Solvent
Ruifen Jiang, Jianqiao Xu, Shuyao Huang, Jing Xu, Xiwen Liu, Qi Wang, Xianguo Liu, Li Yin, Gangfeng Ouyang, Fang Zhu
Solid-phase microextraction (SPME) coupled with liquid chromatograph (LC) is widely used to detect polar and ionic organic compounds, including various pharmaceuticals and endogenous bioactive compounds. In this study, a small-sized insert tube for use in the commercial autosampler vial was designed for eluting the extracted analytes from SPME fibers for LC analysis. By using this custom-made insert tube as an alternative to the commercial insert tube, the volume of the elution solvent was reduced by four-fifths. Even though smaller fractions of the analytes were eluted from the fiber coatings, the analyte concentrations in the elution solutions were substantially increased by using the custom-made insert tube. Therefore, larger amounts of the analytes could be injected to LC and higher signal-to-noise ratios could be achieved, even at smaller injection volumes. Since the elution in the custom-made insert tube was nonexhaustive, four strategies were developed to figure out the extracted amounts in the fiber coatings. In combination with the sampling-rate calibration method, these strategies were successfully used to determine the concentrations of fluoxetine in living tilapias. This study provides a simple but effect way for improving the analytical sensitivity when coupling SPME with LC.

Publisher URL: http://dx.doi.org/10.1021/acs.analchem.7b04777

DOI: 10.1021/acs.analchem.7b04777

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