title: Ionic Liquid-Mediated Multi-Walled Carbon Nanotube-Polydimethylsiloxane Fiber for Headspace Solid-Phase Microextraction of Phenolic Compounds in Aqueous Samples by Gas Chromatography Coupled to Flame Ionization Detector.
abstract: An ionic liquid-mediated multi-walled carbon nanotube (MWCNT)-polydimethylsiloxane (PDMS) sorbent was developed for headspace solid-phase microextraction (HS-SPME) of phenolic compounds from human urine samples. Sol-gel method was used to prepare this sorbent. For this purpose, MWCNTs were functionalized covalently and were attached chemically to the hydroxyl-terminated PDMS. Prepared fiber showed high thermal stability (over than 320°C) and good lifespan (>210 times). These good performances can be attributed to the performance of carbon nanotubes and sol-gel method. Affecting parameters on the efficiency of HS-SPME were investigated and optimized. Under the optimal conditions, linear dynamic ranges were observed over a range of 0.002-200 ng mL-1with limits of detection from 0.0005 to 0.005 ng mL-1and limits of quantitation between 0.002 and 0.02 ng mL-1The relative standard deviations for one fiber (repeatability) (n = 5) at three different concentrations (0.05, 2 and 100 ng mL-1) were obtained from 4.6 up to 6.7% and between fibers or batch to batch (n = 3) (reproducibility) in the range of 5.7-7.8%. Urine samples were used as real samples. All real samples were spiked at 0.5 ng mL-1of understudy analytes and the relative recovery percentages obtained from 90.7 to 102.1%.
authors.affiliation: Department of Biochemistry and Biophysics, Education and Research Center of Science and Biotechnology, Malek Ashtar University of Technology, Shahid babaei highway, Lavizan, Tehran 15875-1774, Iran minoosadri92@gmail.com.
authors.forename: Minoo
authors.initials: M
authors.lastname: Sadri
authors.affiliation: Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Azadi square, Mashhad 9177948974, Iran.
authors.forename: Hossein
authors.initials: H
authors.lastname: Vatani
mesh_terms: D004129:Dimethylpolysiloxanes / Q000737:chemistry; D004355:Drug Stability; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D052578:Ionic Liquids / Q000737:chemistry; D057230:Limit of Detection; D016014:Linear Models; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010636:Phenols / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D015203:Reproducibility of Results; D052617:Solid Phase Microextraction / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D004129:Dimethylpolysiloxanes; D052578:Ionic Liquids; D037742:Nanotubes, Carbon; D010636:Phenols; D014874:Water Pollutants, Chemical; C013830:baysilon