An electrochemiluminescence(ECL) biosensor based on solid phase antigen competitive immunoreactions was constructed to determine methsulfuron methyl using Ru(bpy) 2+ 3 as labeling reagent. The coating hapten was bound...An electrochemiluminescence(ECL) biosensor based on solid phase antigen competitive immunoreactions was constructed to determine methsulfuron methyl using Ru(bpy) 2+ 3 as labeling reagent. The coating hapten was bound to the surface of microparticles through avitin biotin reaction. An electrochemical flow cell containing working electrodes and counter electrodes for initiation of the ECL reaction was constructed. Results showed that the detection limit for methsulfuron methyl was 0.1 ng/mL. [WT5HZ]展开更多
以磁性微球固定相思子毒素多抗制备捕获探针,以三联吡啶钌标记相思子毒素单抗作为发光探针,两者与相思子毒素发生特异性免疫反应形成夹心复合物,成功建立了相思子毒素的电化学发光免疫传感检测方法。利用此方法检测相思子毒素,浓度在0.1...以磁性微球固定相思子毒素多抗制备捕获探针,以三联吡啶钌标记相思子毒素单抗作为发光探针,两者与相思子毒素发生特异性免疫反应形成夹心复合物,成功建立了相思子毒素的电化学发光免疫传感检测方法。利用此方法检测相思子毒素,浓度在0.1～1000μg/L范围内与电化学发光强度呈良好的对数线性关系,拟合方程为lg Y=0.763 lg X+0.562(R=0.9903,N=7,P<0.0001),检出限为0.1μg/L。展开更多
In this work, a double signal amplified immunosen- sor based on the enhanced CdSe@ZnS quantum dots （QDs） electrochemiluminescence （ECL） via TiO2 nanoparticles （TiO2 NPs） and the outstanding quencher of polydopam...In this work, a double signal amplified immunosen- sor based on the enhanced CdSe@ZnS quantum dots （QDs） electrochemiluminescence （ECL） via TiO2 nanoparticles （TiO2 NPs） and the outstanding quencher of polydopamine （PDA） decorated Au nanoparticles （Au@PDA NPs） for ultrasensitive detection of carcinoembryonic antigen （CEA） has been successfully achieved. The ECL of CdSe@ZnS QDs with different sizes has been investigated carefully, especially cooperation with TiO2 NPs. Au@PDA NPs have been synthesized and characterized by transmission electron microscopy （TEM） and UV-Vis spectrum, which acted as ECL quenchers to label the secondary antibody （Ab2） of CEA to form Ab2/Au@PDA NPs conjugates. The sandwich-structured immunosensor was formed between capture antibody （Abl） on CdSe@ZnS QDs/TiO2 NPs/glassy carbon electrode, CEA and Ab2/Au@PDA NPs conjugates, resulting in a proportional ECL quenching signal relevant to the CEA concentration. Thus, CEA as a model biomarker has been detected in the linear range from 0.001 to 100 ng mL^-1 with a limit of detection of 0.35 pg mL^-1 （S/N = 3）.展开更多
The electrochemiluminescence(ECL) behavior of N-(4-aminobutyl)-N-ethylisoluminol(ABEI)-functionalized graphene composite(ABEI-GC) modified on an indium tin oxide(ITO) electrode was studied. ABEI-GC exhibited excellent...The electrochemiluminescence(ECL) behavior of N-(4-aminobutyl)-N-ethylisoluminol(ABEI)-functionalized graphene composite(ABEI-GC) modified on an indium tin oxide(ITO) electrode was studied. ABEI-GC exhibited excellent ECL activity. On this basis, a label-free ECL immunosensor was developed for the sensitive detection of human immunoglobulin G(h Ig G) by using ABEI-GC as the ECL nano-interface via a layer-by-layer assembly technique. ABEI-GC was first assembled onto an ITO electrode. Positively charged chitosan was then electrostatically adsorbed to the modified electrode. Finally, negatively charged antibody-coated gold nanoparticles were attached to the surface to form the ECL immunosensor. In the presence of h Ig G, h Ig G was captured by its antibody. In addition, an ECL signal was detected in the presence of H2O2 when a double potential was applied. The ECL immunosensor for the determination of h Ig G showed a linear range of 1.0×10-13–1.0×10-8 g/mL with a detection limit of 5.0×10-14 g/m L. This immunosensor has high sensitivity, wide linearity and good reproducibility. The superior sensitivity of the proposed ECL immunoassay mainly derives from the incorporation of ABEI-GC, which not only improves the ECL intensity, response speed, and stability, but also provides a large specific surface for high levels of protein loading. This work reveals that ABEI-GC is good nano-interface for the construction of ECL biosensors. Our strategy is promising for protein detection and may open up a new avenue for ultrasensitive label-free immunoassays.展开更多
文摘An electrochemiluminescence(ECL) biosensor based on solid phase antigen competitive immunoreactions was constructed to determine methsulfuron methyl using Ru(bpy) 2+ 3 as labeling reagent. The coating hapten was bound to the surface of microparticles through avitin biotin reaction. An electrochemical flow cell containing working electrodes and counter electrodes for initiation of the ECL reaction was constructed. Results showed that the detection limit for methsulfuron methyl was 0.1 ng/mL. [WT5HZ]
文摘以磁性微球固定相思子毒素多抗制备捕获探针,以三联吡啶钌标记相思子毒素单抗作为发光探针,两者与相思子毒素发生特异性免疫反应形成夹心复合物,成功建立了相思子毒素的电化学发光免疫传感检测方法。利用此方法检测相思子毒素,浓度在0.1～1000μg/L范围内与电化学发光强度呈良好的对数线性关系,拟合方程为lg Y=0.763 lg X+0.562(R=0.9903,N=7,P<0.0001),检出限为0.1μg/L。
基金supported by the National Natural Science Foundation of China (21575022, 21535003)the National High Technology Research and Development Program of China (2015AA020502)+1 种基金the Open Research Fund of Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast Universitythe Fundamental Research Funds for the Central Universities (KYLX15-0127)
文摘In this work, a double signal amplified immunosen- sor based on the enhanced CdSe@ZnS quantum dots （QDs） electrochemiluminescence （ECL） via TiO2 nanoparticles （TiO2 NPs） and the outstanding quencher of polydopamine （PDA） decorated Au nanoparticles （Au@PDA NPs） for ultrasensitive detection of carcinoembryonic antigen （CEA） has been successfully achieved. The ECL of CdSe@ZnS QDs with different sizes has been investigated carefully, especially cooperation with TiO2 NPs. Au@PDA NPs have been synthesized and characterized by transmission electron microscopy （TEM） and UV-Vis spectrum, which acted as ECL quenchers to label the secondary antibody （Ab2） of CEA to form Ab2/Au@PDA NPs conjugates. The sandwich-structured immunosensor was formed between capture antibody （Abl） on CdSe@ZnS QDs/TiO2 NPs/glassy carbon electrode, CEA and Ab2/Au@PDA NPs conjugates, resulting in a proportional ECL quenching signal relevant to the CEA concentration. Thus, CEA as a model biomarker has been detected in the linear range from 0.001 to 100 ng mL^-1 with a limit of detection of 0.35 pg mL^-1 （S/N = 3）.
基金supported by the National Natural Science Foundation of China(20625517,21075115,21173201)the Merieux Research Grants,the Fundamental Research Funds for the Central Universities(WK2060190007)the Opening Fund of the State Key Laboratory of Electroanalytical Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences(SKLEAC201408)
文摘The electrochemiluminescence(ECL) behavior of N-(4-aminobutyl)-N-ethylisoluminol(ABEI)-functionalized graphene composite(ABEI-GC) modified on an indium tin oxide(ITO) electrode was studied. ABEI-GC exhibited excellent ECL activity. On this basis, a label-free ECL immunosensor was developed for the sensitive detection of human immunoglobulin G(h Ig G) by using ABEI-GC as the ECL nano-interface via a layer-by-layer assembly technique. ABEI-GC was first assembled onto an ITO electrode. Positively charged chitosan was then electrostatically adsorbed to the modified electrode. Finally, negatively charged antibody-coated gold nanoparticles were attached to the surface to form the ECL immunosensor. In the presence of h Ig G, h Ig G was captured by its antibody. In addition, an ECL signal was detected in the presence of H2O2 when a double potential was applied. The ECL immunosensor for the determination of h Ig G showed a linear range of 1.0×10-13–1.0×10-8 g/mL with a detection limit of 5.0×10-14 g/m L. This immunosensor has high sensitivity, wide linearity and good reproducibility. The superior sensitivity of the proposed ECL immunoassay mainly derives from the incorporation of ABEI-GC, which not only improves the ECL intensity, response speed, and stability, but also provides a large specific surface for high levels of protein loading. This work reveals that ABEI-GC is good nano-interface for the construction of ECL biosensors. Our strategy is promising for protein detection and may open up a new avenue for ultrasensitive label-free immunoassays.
