title: A solid-phase microextraction platinized stainless steel fiber coated with a multiwalled carbon nanotube-polyaniline nanocomposite film for the extraction of thymol and carvacrol in medicinal plants and honey.
abstract: A mechanically hard and cohesive porous fiber, with large surface area, for more strong attachment of the coating was provided by platinizing a stainless steel wire. Then, the platinized stainless steel fiber was coated with a multiwalled carbon nanotube/polyaniline (MWCNT/PANI) nanocomposite using electrophoretic deposition (EPD) method and applied for the extraction of thymol and carvacrol with direct-immersion solid-phase microextraction (DI-SPME) method followed by high-performance liquid chromatography-ultraviolet detection (HPLC-UV) quantification. To provide a larger coarse surface for the tightened attachment of coating on the fiber, a stainless steel wire was platinized using a suitable optimized EPD method. Different experimental parameters were studied and the optimal conditions were obtained as: pH of the sample solution: 2; extraction time: 60min; salt content in the sample solution: 1% w/v NaNO3; desorption time: 60min; type and volume of the desorption solvent: acetonitrile, 100μL. Under the optimized conditions, limits of detection (LODs) were 0.6 and 0.8μgmL(-1) for thymol and carvacrol, respectively. Linear dynamic range (LDR) for the calibration curves of both analytes were 1-80μgmL(-1). Relative standard deviation (RSD%, n=6) was 6.8 for thymol and 12.7 for carvacrol. The proposed fiber was successfully applied for the recovery and determination of thymol and carvacrol in thyme, savory, and honey samples.
authors.affiliation: Department of Chemistry, Lorestan University, Khoramabad, Iran. Electronic address: a_ghiasvand@yahoo.com.
authors.forename: Alireza
authors.initials: A
authors.lastname: Ghiasvand
authors.affiliation: Department of Chemistry, Lorestan University, Khoramabad, Iran.
authors.forename: Samira
authors.initials: S
authors.lastname: Dowlatshah
authors.affiliation: Department of Chemistry, Lorestan University, Khoramabad, Iran.
authors.forename: Nadia
authors.initials: N
authors.lastname: Nouraei
authors.affiliation: Department of Chemistry, Lorestan University, Khoramabad, Iran.
authors.forename: Nahid
authors.initials: N
authors.lastname: Heidari
authors.affiliation: Department of Chemistry, Lorestan University, Khoramabad, Iran.
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Yazdankhah
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation* / Q000379:methods*; D000081007:Cymenes; D006722:Honey; D057230:Limit of Detection; D039821:Monoterpenes / Q000302:isolation & purification*; D053761:Nanocomposites / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D052617:Solid Phase Microextraction / Q000295:instrumentation*; D013193:Stainless Steel / Q000737:chemistry; D013943:Thymol / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D000814:Aniline Compounds; D000081007:Cymenes; D039821:Monoterpenes; D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical; C416807:polyaniline; D013193:Stainless Steel; D013943:Thymol; C073316:carvacrol
keywords: Carvacrol; Electrophoretic deposition; HPLC; Multiwalled carbon nanotube/polyaniline; Solid-phase microextraction; Thymol