Journal
JOURNAL OF SEPARATION SCIENCE
Volume 44, Issue 6, Pages 1130-1139Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.202000401
Keywords
aldehydes; metal-organic frameworks; polyaniline; solid-phase microextraction
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Metal-organic frameworks with nanoporosity, crystal structure, good stability, and high surface-to-volume ratio have been used as efficient sorbents for adsorption and separation purposes. In this study, a metal-organic framework/polyaniline magnetite nanocomposite was successfully synthesized for solid-phase microextraction fiber, which was then coupled with gas chromatography-flame ionization detection for the extraction and determination of aldehydes in biological samples.
Nanoporosity, crystal structure, good thermal and mechanical stability, high surface-to-volume ratio, nanoscale cavities, and uniform pore topology have made metal-organic frameworks one of the best class of sorbents for adsorption/separation purposes. In this research, a metal-organic framework/polyaniline magnetite nanocomposite was synthesized and intercalated by polyaniline by electrophoretic deposition on the surface of a thin steel wire, to prepare a solid-phase microextraction fiber. It was coupled with gas chromatography-flame ionization detection and employed for the extraction and determination of aldehydes in biological samples. The magnetic nanocomposite was characterized using scanning electron microscopy, energy dispersive X-ray analysis, and Fourier transform infrared spectroscopy. Under the optimal experimental conditions, the calibration curves were linear in the range of 0.01-1 and 0.1-1 mu g/L for hexanal and heptanal, respectively. The limits of detections for hexanal and heptanal were 0.001 and 0.01 mu g/L, respectively. Intrafiber repeatability for six replicate analyses of 0.2 mu g/L of the analytes was over the range 3.5-7.1%. Interfiber (fiber-to-fiber) reproducibility, calculated by six replicate analyses of the same concentration using three different fibers, and was found to be 10.4-15.7%. The developed procedure was successfully utilized for the analysis of hexanal and heptanal in human plasma and urine samples.
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