title: A zeolitic imidazolate framework based nanoporous carbon as a novel fiber coating for solid-phase microextraction of pyrethroid pesticides.
abstract: A high-surface-area nanoporous carbon (NPC) has been successfully synthesized by using the metal-organic framework ZIF-90 as both the template and precursor together with furfuryl alcohol as a secondary carbon source. The prepared ZIF-90 templated NPC (ZIF-90-NPC) was then coated onto a stainless steel wire by a simple physical adhesion approach to prepare solid-phase microextraction (SPME) fiber. By coupling the ZIF-90-NPC coated fiber-based SPME with gas chromatography-microelectron capture detection (GC-μECD), the developed method gave a large enhancement factor (984-2869), low limit of detection (0.1-0.5ngg-1) and good linearity (0.3-50ngg-1) for the determination of some pyrethroid pesticides (bifenthrin, fenpropathrin, cyhalothrin, permethrin, cyfluthrin, flucythrinate, fenvalerate and deltamethrin) from different fruits and vegetables. The relative standard deviations (RSDs) for six replicate extractions of the pyrethroids by the ZIF-90-NPC coated fiber ranged from 4.3% to 8.0%. The recoveries of the spiked pyrethroids (5ngg-1and 20ngg-1) from fruit and vegetable samples were in the range of 88.0-104.0% and 86.0-103.5% with the RSDs ranging from 4.8% to 12.9% and 5.0-10.8%, respectively. Besides, the ZIF-90-NPC coated fiber was stable enough for 100 extraction cycles without a significant loss of extraction efficiency. The method was successfully applied to the determination of the pyrethroids in fruit and vegetable samples.
authors.affiliation: Department of Chemistry, College of Science, Hebei Agricultural University, Baoding 071001, China.
authors.forename: Shuaihua
authors.initials: S
authors.lastname: Zhang
authors.affiliation: College of Science and Technology, Hebei Agricultural University, Cangzhou 061100, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Yang
authors.affiliation: Department of Chemistry, College of Science, Hebei Agricultural University, Baoding 071001, China.
authors.forename: Xiumin
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Chemistry, College of Science, Hebei Agricultural University, Baoding 071001, China.
authors.forename: Wenchang
authors.initials: W
authors.lastname: Wang
authors.affiliation: Department of Chemistry, College of Science, Hebei Agricultural University, Baoding 071001, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Li
authors.affiliation: Department of Chemistry, College of Science, Hebei Agricultural University, Baoding 071001, China.
authors.forename: Lihong
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, College of Science, Hebei Agricultural University, Baoding 071001, China.
authors.forename: Chun
authors.initials: C
authors.lastname: Wang
authors.affiliation: Department of Chemistry, College of Science, Hebei Agricultural University, Baoding 071001, China. Electronic address: zhiwang2013@aliyun.com.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Wang
mesh_terms: D002244:Carbon / Q000737:chemistry*; D005506:Food Contamination / Q000032:analysis; D007093:Imidazoles / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry / Q000302:isolation & purification*; D016062:Porosity; D011722:Pyrethrins / Q000737:chemistry / Q000302:isolation & purification*; D012828:Silicones / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000379:methods*; D014675:Vegetables / Q000737:chemistry; D017641:Zeolites / Q000737:chemistry*
chemical_list: D007093:Imidazoles; D010575:Pesticides; D011722:Pyrethrins; D012828:Silicones; D017641:Zeolites; D002244:Carbon
keywords: Fruit and vegetable samples; Nanoporous carbon; Pyrethroid pesticides; Solid-phase microextraction; Zeolitic imidazolate framework-90