چکیده
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In this research, layered double hydroxide/halloysite (LDH/Halloysite)
nanocomposite was synthesized as a coating for solid-phase
microextraction fiber for extraction of phenolic compounds (PCs) in the
plasma and water samples. The size, morphology, composition, and
properties of the prepared nanocomposite were also characterized
using scanning electron microscopy (SEM), Fourier transform- infrared
spectroscopy (FT-IR), energy-dispersive X-ray spectrometry (EDX), and
thermogravimetric analysis (TGA). After solid-phase microextraction,
the phenolic compounds were quantified via gas chromatography-mass
spectrometry. Analytical merits of the method, under optimum conditions
(extraction temperature: 80°C, extraction time: 30 min, pH: 6.5, stirring
rate: 500 rpm, and salt concentration: 15% wv-1), are 0.01–200 ng mL-1
for the linear dynamic range and 0.2-4 pgmL-1 for the limit of detection.
In optimum conditions, the repeatabilities for one fiber (n = 3), expressed
as relative standard deviation, was between 4.1 and 7.6% for the phenolic
compounds. Ultimately, for the analysis of the river water and plasma
samples, the SPME technique was successfully applied.
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