The Experts below are selected from a list of 105 Experts worldwide ranked by ideXlab platform
Zhi Wang - One of the best experts on this subject based on the ideXlab platform.
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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
Journal of Agricultural and Food Chemistry, 2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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, pe...
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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
Journal of agricultural and food chemistry, 2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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, pe...
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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
2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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
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Zeolitic imidazole framework templated synthesis of nanoporous carbon as a novel fiber coating for solid-phase microextraction.
The Analyst, 2015Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract:A new solid-phase microextraction (SPME) fiber coating material, a zeolitic imidazole framework-67 (ZIF-67) templated nanoporous carbon, Co-NPC, was fabricated by one-step direct carbonization of ZIF-67 without using any other carbon precursors. The prepared Co-NPC was then coated onto a functionalized stainless steel wire by a simple physical coating method to prepare SPME fibers. By coupling the Co-NPC coated fiber based SPME with gas chromatography/micro-electron capture detection (GC/μECD), the developed method exhibited low limits of detection (0.07-0.45 ng g(-1)) and a wide linearity (0.30-50 ng g(-1)) for the determination of five organochlorine pesticides (OCPs) in vegetable samples. The method was applied to the analysis of Cabbage, cucumber and Celery Cabbage samples, and the recoveries of the analytes were in the range of 87.9-103.9% with the relative standard deviations (RSDs) ranging from 5.1% to 10.4% (n = 5). Single fiber repeatability and fiber-to-fiber reproducibility values expressed as RSDs were in the range of 4.9-9.6% and 5.8-11.0%, respectively. The method was simple, convenient and feasible for the determination of OCPs in real samples.
Shuaihua Zhang - One of the best experts on this subject based on the ideXlab platform.
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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
Journal of Agricultural and Food Chemistry, 2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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, pe...
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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
Journal of agricultural and food chemistry, 2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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, pe...
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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
2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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
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Zeolitic imidazole framework templated synthesis of nanoporous carbon as a novel fiber coating for solid-phase microextraction.
The Analyst, 2015Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract:A new solid-phase microextraction (SPME) fiber coating material, a zeolitic imidazole framework-67 (ZIF-67) templated nanoporous carbon, Co-NPC, was fabricated by one-step direct carbonization of ZIF-67 without using any other carbon precursors. The prepared Co-NPC was then coated onto a functionalized stainless steel wire by a simple physical coating method to prepare SPME fibers. By coupling the Co-NPC coated fiber based SPME with gas chromatography/micro-electron capture detection (GC/μECD), the developed method exhibited low limits of detection (0.07-0.45 ng g(-1)) and a wide linearity (0.30-50 ng g(-1)) for the determination of five organochlorine pesticides (OCPs) in vegetable samples. The method was applied to the analysis of Cabbage, cucumber and Celery Cabbage samples, and the recoveries of the analytes were in the range of 87.9-103.9% with the relative standard deviations (RSDs) ranging from 5.1% to 10.4% (n = 5). Single fiber repeatability and fiber-to-fiber reproducibility values expressed as RSDs were in the range of 4.9-9.6% and 5.8-11.0%, respectively. The method was simple, convenient and feasible for the determination of OCPs in real samples.
Wenchang Wang - One of the best experts on this subject based on the ideXlab platform.
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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
Journal of Agricultural and Food Chemistry, 2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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, pe...
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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
Journal of agricultural and food chemistry, 2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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, pe...
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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
2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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
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Zeolitic imidazole framework templated synthesis of nanoporous carbon as a novel fiber coating for solid-phase microextraction.
The Analyst, 2015Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract:A new solid-phase microextraction (SPME) fiber coating material, a zeolitic imidazole framework-67 (ZIF-67) templated nanoporous carbon, Co-NPC, was fabricated by one-step direct carbonization of ZIF-67 without using any other carbon precursors. The prepared Co-NPC was then coated onto a functionalized stainless steel wire by a simple physical coating method to prepare SPME fibers. By coupling the Co-NPC coated fiber based SPME with gas chromatography/micro-electron capture detection (GC/μECD), the developed method exhibited low limits of detection (0.07-0.45 ng g(-1)) and a wide linearity (0.30-50 ng g(-1)) for the determination of five organochlorine pesticides (OCPs) in vegetable samples. The method was applied to the analysis of Cabbage, cucumber and Celery Cabbage samples, and the recoveries of the analytes were in the range of 87.9-103.9% with the relative standard deviations (RSDs) ranging from 5.1% to 10.4% (n = 5). Single fiber repeatability and fiber-to-fiber reproducibility values expressed as RSDs were in the range of 4.9-9.6% and 5.8-11.0%, respectively. The method was simple, convenient and feasible for the determination of OCPs in real samples.
Chun Wang - One of the best experts on this subject based on the ideXlab platform.
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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
Journal of Agricultural and Food Chemistry, 2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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, pe...
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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
Journal of agricultural and food chemistry, 2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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, pe...
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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
2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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
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Zeolitic imidazole framework templated synthesis of nanoporous carbon as a novel fiber coating for solid-phase microextraction.
The Analyst, 2015Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract:A new solid-phase microextraction (SPME) fiber coating material, a zeolitic imidazole framework-67 (ZIF-67) templated nanoporous carbon, Co-NPC, was fabricated by one-step direct carbonization of ZIF-67 without using any other carbon precursors. The prepared Co-NPC was then coated onto a functionalized stainless steel wire by a simple physical coating method to prepare SPME fibers. By coupling the Co-NPC coated fiber based SPME with gas chromatography/micro-electron capture detection (GC/μECD), the developed method exhibited low limits of detection (0.07-0.45 ng g(-1)) and a wide linearity (0.30-50 ng g(-1)) for the determination of five organochlorine pesticides (OCPs) in vegetable samples. The method was applied to the analysis of Cabbage, cucumber and Celery Cabbage samples, and the recoveries of the analytes were in the range of 87.9-103.9% with the relative standard deviations (RSDs) ranging from 5.1% to 10.4% (n = 5). Single fiber repeatability and fiber-to-fiber reproducibility values expressed as RSDs were in the range of 4.9-9.6% and 5.8-11.0%, respectively. The method was simple, convenient and feasible for the determination of OCPs in real samples.
Qian Yang - One of the best experts on this subject based on the ideXlab platform.
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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
Journal of Agricultural and Food Chemistry, 2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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, pe...
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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
Journal of agricultural and food chemistry, 2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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, pe...
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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
2016Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract: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
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Zeolitic imidazole framework templated synthesis of nanoporous carbon as a novel fiber coating for solid-phase microextraction.
The Analyst, 2015Co-Authors: Shuaihua Zhang, Qian Yang, Wenchang Wang, Chun Wang, Zhi WangAbstract:A new solid-phase microextraction (SPME) fiber coating material, a zeolitic imidazole framework-67 (ZIF-67) templated nanoporous carbon, Co-NPC, was fabricated by one-step direct carbonization of ZIF-67 without using any other carbon precursors. The prepared Co-NPC was then coated onto a functionalized stainless steel wire by a simple physical coating method to prepare SPME fibers. By coupling the Co-NPC coated fiber based SPME with gas chromatography/micro-electron capture detection (GC/μECD), the developed method exhibited low limits of detection (0.07-0.45 ng g(-1)) and a wide linearity (0.30-50 ng g(-1)) for the determination of five organochlorine pesticides (OCPs) in vegetable samples. The method was applied to the analysis of Cabbage, cucumber and Celery Cabbage samples, and the recoveries of the analytes were in the range of 87.9-103.9% with the relative standard deviations (RSDs) ranging from 5.1% to 10.4% (n = 5). Single fiber repeatability and fiber-to-fiber reproducibility values expressed as RSDs were in the range of 4.9-9.6% and 5.8-11.0%, respectively. The method was simple, convenient and feasible for the determination of OCPs in real samples.