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学者姓名:齐国敏
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A novel three-dimensional covalent organic framework (3D-COF) with content-tunable and active hydroxyl groups (OH) on the pore walls was developed and adopted for the high-performance capture of okadaic acid (OA) marine toxins. Using pore-surface engineering, the integration of linear building blocks (4,4'-diamino-3,3'- biphenyldiol, BD(OH)2 and benzidine, BD) with the 3D structural building block backbone (4,4',4',4'''-methane-tetrayltetrabenzaldehyde, TFPM) was achieved. By adjusting the ratio of BD(OH)2, functional multicomponent-COFs [OH](x)-BD-TFPM COFs (X = 25%) were synthesized, which offered ideal access to convert a conventional COF into a functional platform with multiple-mode interactions of hydrophobic and hydrophilic groups for OA capture. [OH](x)-BD-TFPM was characterized using SEM, XRD, FT-IR, and BET. The adsorption features and analytical performance of OA were screened and evaluated. Optimization of dispersive solid-phase extraction using [OH]25-BD-TFPM was accomplished, and the method was verified for sensitive quantitative detection of OA in clam and mussel samples. Coupled with LC-MS/MS, the resultant [OH]25-BD-TFPM COF demonstrated the ability to analyze OA, and the limit of detection for OA in shellfish was determined to be 0.005 mu g/kg. A significant improvement in trace OA detection was observed compared to previously reported SPE materials without adjustable hydrophilic interactions. The recoveries of OA in the fortified clam and mussel samples were in the ranges of 93.9-105.1% and 96.7-110.2%, respectively. This study highlights that OH-group surface engineering in channel walls is a facile and powerful strategy for developing functional 3D-COFs with multiple interactions for high-performance target capture.
Keyword :
Hydroxyl functionalization Hydroxyl functionalization Okadaic acid Okadaic acid Shellfish toxin Shellfish toxin Surface engineering Surface engineering Three-dimensional covalent organic frameworks Three-dimensional covalent organic frameworks
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GB/T 7714 | Qi, Guomin . Efficient capture and highly sensitive analysis of okadaic acid by three-dimensional covalent organic frameworks with hydroxyl surface engineering [J]. | JOURNAL OF CHROMATOGRAPHY A , 2023 , 1708 . |
MLA | Qi, Guomin . "Efficient capture and highly sensitive analysis of okadaic acid by three-dimensional covalent organic frameworks with hydroxyl surface engineering" . | JOURNAL OF CHROMATOGRAPHY A 1708 (2023) . |
APA | Qi, Guomin . Efficient capture and highly sensitive analysis of okadaic acid by three-dimensional covalent organic frameworks with hydroxyl surface engineering . | JOURNAL OF CHROMATOGRAPHY A , 2023 , 1708 . |
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Herein, a vinylene-linked covalent organic framework (TMT-BPDA-COF) was prepared via the Aldol condensation of 2,4,6-trimethyl-1,3,5-triazine (TMT) and 4,4'-biphenyl dimethyl formaldehyde (BPDA). TMT-BPDACOF displayed high crystallinity and thermal stability, and robust chemical stability in strong acid, strong base and common organic solvents. TMT-BPDA-COF nanosheets emitted strong yellow fluorescence with the quantum yield of 14.9% and showed fast reversible response toward pH with a wide range (pH 0.0 - 14.0) based on the intramolecular charge transfer effect. Furthermore, portable fluorescent sensors were prepared by incorporated TMT-BPDA-COF nanosheets into agarose gel and cellulose acetate butyrate (CAB), respectively. TMT-BPDA-COF gel showed a wide pH response range over pH 0.0 - 14.0 with a linear range of pH 4.0 - 14.0. TMT-BPDA-COF CAB film exhibited high sensitivity for sensing of NH3 gas with a limit of detection of 1.6 ppb. TMT-BPDA-COF agarose gel and CAB film also exhibited good reversibility and reproducibility in response to pH and NH3 gas, respectively. We expect TMT-BPDA-COF-based sensors, which feature fast response, high sensitivity, wide response range, good reproducibility and reversibility, can apply to detect pH and NH3 gas in the field of environment and industry.
Keyword :
Covalent organic frameworks Covalent organic frameworks Films Films Fluorescent sensors Fluorescent sensors Gels Gels NH3 NH3 PH PH
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GB/T 7714 | Cai, Jiaming , Qiu, Yonghan , Qi, Guomin et al. A Highly fluorescent vinylene-linked covalent organic framework for chemical sensing of pH and NH3 gas with wide dynamic range [J]. | SENSORS AND ACTUATORS B-CHEMICAL , 2023 , 402 . |
MLA | Cai, Jiaming et al. "A Highly fluorescent vinylene-linked covalent organic framework for chemical sensing of pH and NH3 gas with wide dynamic range" . | SENSORS AND ACTUATORS B-CHEMICAL 402 (2023) . |
APA | Cai, Jiaming , Qiu, Yonghan , Qi, Guomin , Guo, Liangqia . A Highly fluorescent vinylene-linked covalent organic framework for chemical sensing of pH and NH3 gas with wide dynamic range . | SENSORS AND ACTUATORS B-CHEMICAL , 2023 , 402 . |
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MC-LR possessing strong hepatotoxicity, potential carcinogenicity, and biological toxicity could have an intensive influence on human health and the aquatic ecological environment and need to be monitored critically. For the specific and highly sensitive analysis performance, agold-magnetic composite nanoparticlemodified by aptamer-cDNAfluorescent hybridization probe (Fe3O4@ MIL-101 -NH2 @Au@aptamer) was prepared and applied for sensing detection of MC-LR in water with laser-induced fluorescence (LIF). This work studied the feasibility, optimization of analysis conditions, specificity, stability of the method, and sample analysis application. As a result, a high Brunauer-Emmett-Teller (BET) specific surface area of 114. 02 m(2) center dot g(-1) was achieved in Fe3O4@ MIL-101-NH2@ AuNPs, which resulted in a high modification rate of up to 98. 8%0 achieved for aptamercDNA fluorescenthybridization probe. With the excitation wavelength of 497 nm, the aptamer-cDNA fluorescent probe has a strong fluorescence response with the emission wavelength of 512 nm to the trace MC-LR. Under the optimal conditions (pH 7. 5, NaC1 concentration 500 mmol center dot L-1 nanogold size 20 nm, analytical time 30 min), a good linear relationship between MCLR concentration and fluorescence intensity was achieved in a wide linear range (0. 020 similar to 3. 000 mu g center dot L-1) with the limit of detection (LOD) as low as 0. 006 mu g center dot L-1, which was 1. 6 similar to 22. 3 folds better than that of the most fluorescence methods reported previously. The relative standard deviation (RSD) of intra-day, intra-day, and inter-batch was gained in 1. 7%similar to 8. 8%, and the relative error (RE) of -4. 3%similar to 4. 1%0. High specific selectivity and low cross-reactivity for MC-LR (1. 0 mu g center dot L-1) were also achieved using theas-prepared fluorescent probe, even if the concentration of interfering toxins (MC-RR, MCYR, OA) was 100 folds higher than that of MC-LR. The fluorescence responses of MC-LR in these mixtures werewell consistent with that of MC-LR in the standard solution. Applied to the analysis of samples from the Minjiang River, Lake Water, and the inland river, the identification of MC-LR in water samples was satisfactory. The recovery yields of MC-LR for three concentrations (0. 050, 0. 100 and 1. 000 mu g center dot L-1) rangedin (90. 1%+/- 0 6. 4%) (104. 2%+/- 7. 0%) (n=3). The results were consistent with those obtained by the LC-MS method [(91. 3%+/- 0 7. 0%) (104. 4%+/- 2. 0%), n=3]. It might light a new technique for the specific and rapid monitoring technology for tracing MC-LR in the environmental water.
Keyword :
Aptamer Aptamer Hybridization probe Hybridization probe Laser induced fluorescence Laser induced fluorescence Magnetic nanoparticle Magnetic nanoparticle MC-LR MC-LR
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GB/T 7714 | Qi Guo-min , Tong Shi-qian , Lin Xu-cong . Specific Identification of Microcystin-LR by Aptamer-Functionalized Magnetic Nanoprobe With Laser-Induced Fluorescence [J]. | SPECTROSCOPY AND SPECTRAL ANALYSIS , 2023 , 43 (12) : 3813-3819 . |
MLA | Qi Guo-min et al. "Specific Identification of Microcystin-LR by Aptamer-Functionalized Magnetic Nanoprobe With Laser-Induced Fluorescence" . | SPECTROSCOPY AND SPECTRAL ANALYSIS 43 . 12 (2023) : 3813-3819 . |
APA | Qi Guo-min , Tong Shi-qian , Lin Xu-cong . Specific Identification of Microcystin-LR by Aptamer-Functionalized Magnetic Nanoprobe With Laser-Induced Fluorescence . | SPECTROSCOPY AND SPECTRAL ANALYSIS , 2023 , 43 (12) , 3813-3819 . |
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Electrochemiluminescence (ECL) of graphitic carbon nitride nanosheets (CNNSs) is showing extensive interest to researchers. However, the poor ECL stability of CNNSs has always been an urgent problem, which severely limits its application. Herein, a systemic investigation is carried out for the exact mechanism affecting the ECL stability of CNNSs. It is found experimentally that dissolved oxygen in the solution is selectively reduced into H2O2 through a two-electron pathway on the surface of CNNSs. The enriched electrogenerated H2O2 on the electrode surface leads to the progressive inhibition of ECL of CNNSs due to its competition with negatively charged CNNSs (CNNSs center dot-) for sulfate radical ions (SO4 center dot-). On the basis, the pathway of eliminating O2 by N2, composing CNNSs with other nanomaterials to realize the four-electron reduction, or improving the concentration of K2S2O8 is proved to be effective means for improving ECL stability successfully. Proofing the concept of CNNSs with high ECL stability, an ECL sensor is developed for the detection of H2O2. This work not only exploits the intrinsic mechanism of poor ECL stability of CNNSs, but also provides efficient methods to improve the ECL stability. Thus, we believe it has promising attraction in the research of CNNSs-based assays.
Keyword :
Electrochemiluminescence Electrochemiluminescence Graphitic carbon nitride nanosheets Graphitic carbon nitride nanosheets Luminous stability Luminous stability Mechanism Mechanism
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GB/T 7714 | Fu, Xiaolong , Huang, Ju , Lai, Xiaojing et al. Strategy and mechanism for strong and stable electrochemiluminescence of graphitic carbon nitride [J]. | ELECTROCHIMICA ACTA , 2023 , 444 . |
MLA | Fu, Xiaolong et al. "Strategy and mechanism for strong and stable electrochemiluminescence of graphitic carbon nitride" . | ELECTROCHIMICA ACTA 444 (2023) . |
APA | Fu, Xiaolong , Huang, Ju , Lai, Xiaojing , Rong, Jiefeng , Qi, Guomin , Lin, Zhenyu et al. Strategy and mechanism for strong and stable electrochemiluminescence of graphitic carbon nitride . | ELECTROCHIMICA ACTA , 2023 , 444 . |
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基于柱前衍生-高效液相色谱/紫外检测技术,建立了多糖水解单糖的HPLC分析技术,用于凉粉草提取液多糖水解单糖组分分析和含量测定.采用1-苯基-3-甲基-5-吡唑啉酮(PMP)衍生,优化并获得了单糖组分的衍生条件和HPLC梯度洗脱分析流程,鉴别了核糖、鼠李糖、葡萄糖醛酸、半乳糖醛酸、葡萄糖、半乳糖、木糖、阿拉伯糖等8种单糖;应用于18种凉粉草提取液样品分析,凉粉草多糖水解单糖以半乳糖醛酸、葡萄糖和半乳糖为主,含量分别为2.50~20.48 μg/mL、2.97~38.52 μg/mL、2.72~89.32 μg/mL.该方法操作简单、准确,可为凉粉草多糖提取液水解单糖组分特征评价与定量分析提供技术.
Keyword :
凉粉草多糖 凉粉草多糖 单糖 单糖 柱前衍生 柱前衍生 紫外检测 紫外检测 高效液相色谱 高效液相色谱
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GB/T 7714 | 齐国敏 . 高效液相色谱-紫外检测分析凉粉草多糖水解单糖组分 [J]. | 福建分析测试 , 2022 , 31 (3) : 28-33 . |
MLA | 齐国敏 . "高效液相色谱-紫外检测分析凉粉草多糖水解单糖组分" . | 福建分析测试 31 . 3 (2022) : 28-33 . |
APA | 齐国敏 . 高效液相色谱-紫外检测分析凉粉草多糖水解单糖组分 . | 福建分析测试 , 2022 , 31 (3) , 28-33 . |
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本发明属于分析化学领域,具体涉及一种多聚硅氧烷‑改性石墨烯聚合涂层功能化微萃取探头及其制备方法。所述的微萃取探头是一种基于光引发“巯基‑烯基”反应,通过“巯基‑烯基”点击化学依次将三维笼状结构的多聚硅氧烷功能单体、巯基桥联剂和含有烯键官能团的改性氧化石墨烯“层层组装”键合,并与不锈钢丝表面修饰的巯基发生巯烯键合,形成“不锈钢纤维‑S‑C‑多聚硅氧烷‑S‑C‑桥联剂‑S‑C‑氧化石墨烯”聚合结构的微萃取探头。所制备的聚合涂层具有较大的比表面、离域π‑π键和疏水性作用,对于环境水中挥发性芳香型有机污染物具有良好的吸附性能,可为环境分析提供良好的前处理材料和技术支持。
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GB/T 7714 | 齐国敏 . 一种多聚硅氧烷-改性石墨烯聚合涂层功能化微萃取探头及其制备方法 : CN202110209963.2[P]. | 2021-02-25 . |
MLA | 齐国敏 . "一种多聚硅氧烷-改性石墨烯聚合涂层功能化微萃取探头及其制备方法" : CN202110209963.2. | 2021-02-25 . |
APA | 齐国敏 . 一种多聚硅氧烷-改性石墨烯聚合涂层功能化微萃取探头及其制备方法 : CN202110209963.2. | 2021-02-25 . |
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Time-consuming or tedious operation in multiple-step process might is the obstacle for efficiently preparing aptamer-affinity monolithic column. Here, a new and facile strategy to prepare aptamer-based hybrid affinity monolith in "one-pot" at room temperature was exploited, in which UV light-initiated free-radical polymerization and "thiol-ene" click reaction were implemented simultaneously. Only 7 min was cost for finishing the polymerization reaction, which was only 1/100 of that for the traditional thermal polymerization. Using ochratoxin A (OTA) as the model analyte, the recipe for photo-initiated polymerization was optimized, and SEM morphology, FTIR, EDS, pore size distribution and specific recognition performance were also studied. Compared with traditional thermal polymerization, the resultant monolith was achieved more facilely and displayed better results such as more homogeneous skeleton structure, higher reaction efficiency of aptamer (>88.2%) and better specific selectivity to OTA. Besides, an extremely low nonspecific adsorption of analogues was obtained and showed a level at only 1/25 of that in the similar aptamer-affinity monolith prepared by thermal polymerization. Applied to beer and red wine samples, good recovery yields about 99.7 +/- 4.0% e101.2 +/- 2.3% (n = 3)was achieved with the acceptable RSDs. It would open up a rapid and promising access to efficiently preparing highperformance aptamer-based affinity monolithic columns for online specific recognition. (c) 2021 Elsevier B.V. All rights reserved.
Keyword :
Affinity monolith Affinity monolith Aptamer Aptamer Light-initiated polymerization Light-initiated polymerization One-pot One-pot Online specific recognition Online specific recognition
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GB/T 7714 | Zhao, Tingting , Ding, Xinyue , Chen, Yiqiong et al. Towards highly specific aptamer-affinity monolithic column by efficient UV light-initiated polymerization in "one-pot" [J]. | ANALYTICA CHIMICA ACTA , 2021 , 1165 . |
MLA | Zhao, Tingting et al. "Towards highly specific aptamer-affinity monolithic column by efficient UV light-initiated polymerization in "one-pot"" . | ANALYTICA CHIMICA ACTA 1165 (2021) . |
APA | Zhao, Tingting , Ding, Xinyue , Chen, Yiqiong , Lin, Chenchen , Qi, Guomin , Lin, Xucong et al. Towards highly specific aptamer-affinity monolithic column by efficient UV light-initiated polymerization in "one-pot" . | ANALYTICA CHIMICA ACTA , 2021 , 1165 . |
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Covalent organic frameworks (COFs) showed great promise in effective adsorption of target molecule via size selectivity. Although various magnetic 2D COFs composites have been studied and exhibited the intensive applications, the incorporation of 3D COFs and magnetic nanoparticles to form a new class of magnetic adsorbents with enhanced function still has no reports. Herein, a novel Fe3O4@3D COF with heteroporous structure matching to the sizes of bisphenol A (BPA) was firstly synthesized for better adsorption of BPA than common magnetic 2D-COFs. Three Fe3O4@3D COFs nanospheres were synthesized under the solvothermal conditions in autoclave, and the optimum Fe3O4@3D-COF denoted as Fe3O4@COF-TpTAM (Tp, 1,3,5-triformylphloroglucinol; TAM, tetra(p-aminophenyl)-methane) was selected and employed. Detailed characteristics of Fe3O4@COF-TpTAM were evaluated via various techniques including TEM, FTIR, TGA, XRD and BET. Excellent chemical and thermal stability, high surface area (294.6 m(2) g(-1)) and pore volume (0.2 m(3) g(-1)) with multiple pore sizes comparable with the simulated three-dimensional sizes of BPA were exhibited. A high adsorption capacity of BPA up to 209.9 mg/g that was better than common 2D-COFs was achieved, and the sensitive MSPE-LC-MS method with wide linear range (10-5000 pg/mL), low detection limit (4 pg/mL, S/N = 3) was built. Satisfactory recoveries of BPA as 93.8 +/- 1.4%-101.4 +/- 5.1% (n = 3) and 100.4 +/- 1.9% similar to 107.3 +/- 1.2% (n = 3) were obtained in milk and river water samples, respectively. This work demonstrates the promising application of Fe3O4@3D COF as efficient adsorbents of trace BPA, and opens up a new access for the efficient MSPE in sample pretreatment for food or environmental safety analysis.
Keyword :
3D covalent organic framework 3D covalent organic framework Bisphenol A Bisphenol A Heteroporous Heteroporous Magnetic nanospheres Magnetic nanospheres
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GB/T 7714 | Lu, Feifei , Lin, Jian , Lin, Chenchen et al. Heteroporous 3D covalent organic framework-based magnetic nanospheres for sensitive detection of bisphenol A [J]. | TALANTA , 2021 , 231 . |
MLA | Lu, Feifei et al. "Heteroporous 3D covalent organic framework-based magnetic nanospheres for sensitive detection of bisphenol A" . | TALANTA 231 (2021) . |
APA | Lu, Feifei , Lin, Jian , Lin, Chenchen , Qi, Guomin , Lin, Xucong , Xie, Zenghong . Heteroporous 3D covalent organic framework-based magnetic nanospheres for sensitive detection of bisphenol A . | TALANTA , 2021 , 231 . |
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A functional stainless steel microextraction fiber easily prepared by in situ growing metal-organic framework UiO-66 was presented and used for high-performance analysis of polycyclic musks. Via the robust Ag-SH bonding reaction, mercaptoacetic acid was easily anchored on Ag film to provide carboxyl group on the stainless steel fiber, then in situ grown UiO-66 was fulfilled via the coordination reaction between Zr4+ and carboxyl group. Good characteristics including large surface area, high thermal stability, and good adsorption property were achieved. Sensitive detection limits (0.015-0.040 ng/L) were achieved for polycyclic musks by coupling with gas chromatography with mass spectrometry, and it could be stable enough for 150 extraction cycles without a significant loss of extraction efficiency. Compared with the classical commercial fibers, 2.2-11.4 times higher enhancement factors were shown. Applied to the analysis of fortified river water samples, five typical polycyclic musks were well detected with the recoveries of 90.2-101.8%, respectively. It showed a facile approach for preparing stainless steel microextraction fiber via chemically bonding in situ grown metal-organic framework for high-performance enrichment.
Keyword :
in situ growth in situ growth metal-organic frameworks metal-organic frameworks microextraction microextraction polycyclic musks polycyclic musks stainless steel fibers stainless steel fibers
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GB/T 7714 | Lin, Chenchen , Qi, Guomin , Wang, Li et al. Facile preparation of stainless steel microextraction fiber via in situ growth of metal-organic framework UiO-66 and its application to sensitive analysis of polycyclic musks [J]. | JOURNAL OF SEPARATION SCIENCE , 2020 , 43 (11) : 2240-2246 . |
MLA | Lin, Chenchen et al. "Facile preparation of stainless steel microextraction fiber via in situ growth of metal-organic framework UiO-66 and its application to sensitive analysis of polycyclic musks" . | JOURNAL OF SEPARATION SCIENCE 43 . 11 (2020) : 2240-2246 . |
APA | Lin, Chenchen , Qi, Guomin , Wang, Li , Lin, Xucong , Xie, Zenghong . Facile preparation of stainless steel microextraction fiber via in situ growth of metal-organic framework UiO-66 and its application to sensitive analysis of polycyclic musks . | JOURNAL OF SEPARATION SCIENCE , 2020 , 43 (11) , 2240-2246 . |
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A novel polyhedral oligomeric silsesquioxane (POSS)-containing aptamer-modified hybrid affinity monolith with excellent hydrophilicity and unique architecture without Si-OH groups is presented herein, and the nonspecific adsorption caused by the hydrophobic nature of the monolithic column or polar interaction with silanol groups is minimized. Via a simple one-pot procedure, hydrophilic monomers were facilely polymerized with the POSS-methacryl substituted (POSS-MA) and aptamer; a highly hydrophilic nature was obtained and the lowest contact angle of 11 degrees was achieved. By using ochratoxin A (OTA) as the model analyte, highly selective recognition of OTA in the mixture was achieved and the control of nonspecific interactions and the cross-reactivity of OTB and AFB(1) were significantly improved. The recovery yield of OTB caused by nonspecific adsorption in the resultant monolith was only about 0.1% and remained steady even with the coexistence of a high OTB content (OTA:OTB = 1:50), which reached the best level to date and was obviously less than the 6.1% occurring in the hydrophobic POSS-containing control monolith, 8.3% in the POSS-PEI@AuNPs@aptamer affinity monolith and 18.7% in the silica-hybrid affinity monolith. When applied to wine and wheat samples, the nonspecific adsorption was significantly reduced and efficient discrimination of OTA was obtained with better results than that of the hydrophobic POSS-containing affinity column. This provides an attractive tool for minimizing the nonspecific adsorption for highly selective on-column recognition.
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GB/T 7714 | Chen, Yiqiong , Zhu, Dandan , Ding, Xinyue et al. Highly hydrophilic polyhedral oligomeric silsesquioxane (POSS)-containing aptamer-modified affinity hybrid monolith for efficient on-column discrimination with low nonspecific adsorption [J]. | ANALYST , 2019 , 144 (5) : 1555-1564 . |
MLA | Chen, Yiqiong et al. "Highly hydrophilic polyhedral oligomeric silsesquioxane (POSS)-containing aptamer-modified affinity hybrid monolith for efficient on-column discrimination with low nonspecific adsorption" . | ANALYST 144 . 5 (2019) : 1555-1564 . |
APA | Chen, Yiqiong , Zhu, Dandan , Ding, Xinyue , Qi, Guomin , Lin, Xucong , Xie, Zenghong . Highly hydrophilic polyhedral oligomeric silsesquioxane (POSS)-containing aptamer-modified affinity hybrid monolith for efficient on-column discrimination with low nonspecific adsorption . | ANALYST , 2019 , 144 (5) , 1555-1564 . |
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