title: A solid-phase microextraction coating of sol-gel-derived perhydroxy cucurbit[6]uril and its application on to the determination of polycyclic aromatic hydrocarbon.
abstract: A novel solid-phase microextraction coating that contains perhydroxy cucurbit[6]uril((OH)12Q[6]) was prepared by a sol-gel method. (OH)12Q[6] was used as a starting coating material with hydroxy-terminated poly(dimethylsiloxane) (OH-PDMS) to bond chemically to a fused-silica substrate using 3-(2-cyclooxypropoxyl)propyltrimethoxysilane as cross-linking agent; hydrolysis and polycondensation reactions then led to the formation of a (OH)12Q[6]/PDMS-coating. The coating has a high thermal stability (360°C), long lifetime and can withstand organic and inorganic solvent rinsing because of the chemical binding between the coating and silica substrate. Its performance was tested by headspace (HS) solid-phase microextraction fiber coupled with gas chromatography to determine polycyclic aromatic hydrocarbon (PAHs) compounds in water samples. The (OH)12Q[6]/PDMS-coated fiber exhibited higher enrichment factors from fourfold for naphthalene to tenfold for pyrene compared with commercial PDMS fiber, and the enrichment factors increased with the number of condensed PAH rings. The strong adsorption affinity is believed to be attributed to hydrogen bonding and CH⋯π interactions between PAHs and (OH)12Q[6], according to the results of quantum chemical calculations. In the PAH analysis, the (OH)12Q[6]-coated fiber showed a good repeatability (<4.7%) and reproducibility between fibers (<9.4%), low detection limits (0.03-0.15μgL-1), and a wide linearity (0.1-1000μgL-1) under optimized conditions. This method was used for the simultaneous determination of seven PAHs with satisfactory recoveries of 90.56%-107.4% for Huaxi river water samples and 90.23%-109.5% for local wastewater samples, respectively.
authors.affiliation: School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China; Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guiyang, 550025, China. Electronic address: ndong@gzu.edu.cn.
authors.forename: Nan
authors.initials: N
authors.lastname: Dong
authors.affiliation: School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Luo
authors.affiliation: School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Shao
authors.affiliation: Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guiyang, 550025, China.
authors.forename: Zhu
authors.initials: Z
authors.lastname: Tao
authors.affiliation: School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China. Electronic address: czhu@gzu.edu.cn.
authors.forename: Chun
authors.initials: C
authors.lastname: Zhu
mesh_terms: D001952:Bridged-Ring Compounds / Q000737:chemistry*; D002849:Chromatography, Gas; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D007093:Imidazoles / Q000737:chemistry*; D057230:Limit of Detection; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000379:methods*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis; D000099246:Cucurbit(n)urils
chemical_list: D001952:Bridged-Ring Compounds; D004129:Dimethylpolysiloxanes; D007093:Imidazoles; D011084:Polycyclic Aromatic Hydrocarbons; D012822:Silicon Dioxide; D062065:Wastewater; D014874:Water Pollutants, Chemical; C000617296:perhydroxy cucurbit(6)uril; D000099246:Cucurbit(n)urils; C013830:baysilon
keywords: Perhydroxy cucurbit[6]uril; Polycyclic aromatic hydrocarbon; Sol-gel technology; Solid-phase microextraction coating