title: Covalent Bonding of Metal-Organic Framework-5/Graphene Oxide Hybrid Composite to Stainless Steel Fiber for Solid-Phase Microextraction of Triazole Fungicides from Fruit and Vegetable Samples.
abstract: A hybrid material of the zinc-based metal-organic framework-5 and graphene oxide (metal-organic framework-5/graphene oxide) was prepared as a novel fiber coating material for solid-phase microextraction (SPME). The SPME fibers were fabricated by covalent bonding via chemical cross-linking between the coating material metal-organic framework-5/graphene oxide and stainless steel wire. The prepared fiber was used for the extraction of five triazole fungicides from fruit and vegetable samples. Gas chromatography coupled with microelectron capture detector (GC-μECD) was used for quantification. The developed method gave a low limit of detection (0.05-1.58 ng g(-1)) and good linearity (0.17-100 ng g(-1)) for the determination of the triazole fungicides in fruit and vegetable samples. The relative standard deviations (RSDs) for five replicate extractions of the triazole fungicides ranged from 3.7 to 8.9%. The method recoveries for spiked fungicides (5, 20, and 50 ng g(-1)) in grape, apple, cucumber, celery cabbage, pear, cabbage, and tomato samples were in the range of 85.6-105.8% with the RSDs ranging from 3.6 to 11.4%, respectively, depending on both the analytes and samples. The metal-organic framework-5/graphene oxide coated fiber was stable enough for 120 extraction cycles without a significant loss of extraction efficiency. The method was suitable for the determination of triazole fungicides in fruit and vegetable samples.
authors.affiliation: Department of Chemistry, College of Science, Agricultural University of Hebei , Baoding 071001, China.
authors.forename: Shuaihua
authors.initials: S
authors.lastname: Zhang
authors.affiliation: College of Science and Technology, Agricultural University of Hebei , Cangzhou 061100, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Yang
authors.affiliation: Department of Chemistry, College of Science, Agricultural University of Hebei , Baoding 071001, China.
authors.forename: Wenchang
authors.initials: W
authors.lastname: Wang
authors.affiliation: Department of Chemistry, College of Science, Agricultural University of Hebei , Baoding 071001, China.
authors.forename: Chun
authors.initials: C
authors.lastname: Wang
authors.affiliation: Department of Chemistry, College of Science, Agricultural University of Hebei , Baoding 071001, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Wang
mesh_terms: D002849:Chromatography, Gas; D005638:Fruit / Q000737:chemistry*; D005659:Fungicides, Industrial / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000379:methods*; D013193:Stainless Steel / Q000737:chemistry*; D014230:Triazoles / Q000032:analysis*; D014675:Vegetables / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D005659:Fungicides, Industrial; D010087:Oxides; D014230:Triazoles; D014874:Water Pollutants, Chemical; D013193:Stainless Steel; D006108:Graphite
keywords: covalent bonding; fruit and vegetable samples; metal−organic framework-5/graphene oxide; solid-phase microextraction; triazole fungicides