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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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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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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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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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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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本实用新型涉及一种用于毛细管亲和整体柱在线特异性吸附的装置,属于分析化学仪器设备领域,包括设置于毛细管亲和整体柱上的固定组件,所述固定组件的进样端设置有用于与第一维色谱的采样管出口端联接的样品进样联接部件,固定组件的出口端设置有用于与第二维色谱采样组件进样端相连接的洗脱液导出联接组件。该装置可以较为灵活地分别与第一维色谱的进样、富集、洗脱和第二维色谱的进样流程相衔接。
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GB/T 7714 | 齐国敏 . 一种用于毛细管亲和整体柱在线特异性吸附的装置 : CN201921193586.2[P]. | 2019/7/26 . |
MLA | 齐国敏 . "一种用于毛细管亲和整体柱在线特异性吸附的装置" : CN201921193586.2. | 2019/7/26 . |
APA | 齐国敏 . 一种用于毛细管亲和整体柱在线特异性吸附的装置 : CN201921193586.2. | 2019/7/26 . |
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本发明公开了一种人工合成多环麝香的在线分析方法,其主要是采用微流电色谱和微流液相色谱组成的二维色谱体系进行分析,即先在第一维的微流电色谱中,以高疏水型杂化硅胶整体柱为载体,在柱同步施加高压电场和液相泵高压,利用此双重驱动作用实现人工合成多环麝香的在线富集,然后将第一维微流电色谱洗脱出的样品切换进入第二维的微流液相色谱,以丙烯酸酯聚合整体柱进行人工合成多环麝香的液相色谱分离;其中所述高疏水型杂化硅胶整体柱是以聚倍半硅氧烷笼型无机内核为骨架、芳环深度交联结构为疏水作用点构成,其通透性好、耐溶剂性高。本发明在线分析方法快速简便,能实现对疏水性人工合成多环麝香的高效分析。
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GB/T 7714 | 林旭聪 , 徐雯 , 陈雨晴 et al. 一种人工合成多环麝香的在线分析方法 : CN201710147538.9[P]. | 2017/3/13 . |
MLA | 林旭聪 et al. "一种人工合成多环麝香的在线分析方法" : CN201710147538.9. | 2017/3/13 . |
APA | 林旭聪 , 徐雯 , 陈雨晴 , 齐国敏 , 陈永煊 , 谢增鸿 . 一种人工合成多环麝香的在线分析方法 : CN201710147538.9. | 2017/3/13 . |
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制备一种吖啶-4-酰胺类探针9-[(N-2-二甲氨乙基)吖啶-4-酰胺]-α-丙氨酸(NACA),研究NACA与牛血清蛋白(BSA)的结合作用.测定了Stern-Volmer猝灭常数KSV、热力学参数(△H、△G及△S)、结合位点数n、表观结合常数KA和NACA-BSA作用距离r,确定了NACA对BSA的荧光静态猝灭机制和主要作用力.
Keyword :
9-[(N-2-二甲氨乙基)吖啶-4-酰胺]-α-丙氨酸 9-[(N-2-二甲氨乙基)吖啶-4-酰胺]-α-丙氨酸 牛血清蛋白 牛血清蛋白 猝灭作用 猝灭作用
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GB/T 7714 | 齐国敏 . 一种吖啶-4-酰胺类探针的制备及其与牛血清蛋白作用的研究 [J]. | 福州大学学报(自然科学版) , 2013 , 41 (5) : 940-946 . |
MLA | 齐国敏 . "一种吖啶-4-酰胺类探针的制备及其与牛血清蛋白作用的研究" . | 福州大学学报(自然科学版) 41 . 5 (2013) : 940-946 . |
APA | 齐国敏 . 一种吖啶-4-酰胺类探针的制备及其与牛血清蛋白作用的研究 . | 福州大学学报(自然科学版) , 2013 , 41 (5) , 940-946 . |
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目的 建立微量苯氧羧酸类药物的毛细管开管柱电色谱分析方法.方法 基于三胺键合开管柱,研究毛细管电泳、离子交换以及在线场放大作用,应用于苯氧羧酸类药物的毛细管电色谱分离.结果 在最优条件下,实现了2-苯氧基丙酸(2-PPA)、2,4-二氯苯氧基乙酸(2;4-D)、2-(2-氯苯氧基)丙酸(2,2-CPPA)、2-(3-氧苯氧基)丙酸(2,3-CPPA)的分离检测,检测限为8.0×10-8~~5.0×10-8mol· L-1,应用于实际水样加标检测,回收率为84.0% ~92.3%,RSD< 12%.结论 毛细管电色谱技术对苯氧羧酸类药物分离方法简单,效果良好.
Keyword :
开管柱 开管柱 毛细管电色谱 毛细管电色谱 苯氧基羧酸类药物 苯氧基羧酸类药物
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GB/T 7714 | 齐国敏 . 苯氧羧酸类药物的开管电色谱分析研究 [J]. | 海峡药学 , 2012 , 24 (9) : 39-42 . |
MLA | 齐国敏 . "苯氧羧酸类药物的开管电色谱分析研究" . | 海峡药学 24 . 9 (2012) : 39-42 . |
APA | 齐国敏 . 苯氧羧酸类药物的开管电色谱分析研究 . | 海峡药学 , 2012 , 24 (9) , 39-42 . |
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