A multiporous electrochemical sensor for epinephrine recognition and detection based on molecularly imprinted polypyrrole

被引:57
|
作者
Zhou, Hong [1 ]
Xu, Guilin [1 ]
Zhu, Anhong [1 ]
Zhao, Zhe [1 ]
Ren, Chengcheng [1 ]
Nie, Linlin [1 ]
Kan, Xianwen [1 ,2 ]
机构
[1] Anhui Normal Univ, Coll Chem & Mat Sci, Anhui Key Lab Chemobiosensing, Anhui Key Lab Funct Mol Solids, Wuhu 241000, Peoples R China
[2] Nanjing Univ, State Key Lab Coordinat Chem, Nanjing 210093, Jiangsu, Peoples R China
来源
RSC ADVANCES | 2012年 / 2卷 / 20期
基金
中国国家自然科学基金;
关键词
WALLED CARBON NANOTUBES; SOL-GEL; SELECTIVE DETERMINATION; GOLD NANOPARTICLES; ELECTRODE; BIOSENSORS; NOREPINEPHRINE; NANOMATERIALS; POLYMERS; TEMPLATES;
D O I
10.1039/c2ra20787g
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A novel multiporous imprinted electrochemical sensor was developed for the recognition and detection of epinephrine (EP) by combining a molecularly imprinted polymers (MIPs) film, silica nanoparticles (SiO(2)NPs) and multiwalled carbon nanotubes (MWNTs). A molecular imprinted polypyrrole film was electropolymerized on the surface of a SiO(2)NPs and MWNTs modified glassy carbon electrode (GCE) in the presence of EP. With the etching of SiO(2)NPs, the obtained sensor exhibited a multiporous network structure to allow for efficient mass transport, which would improve the rebinding rate and increase the efficiency of imprinted sites of the sensor. The multiporous imprinted sensor was characterized using scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), differential pulse voltammetry (DPV) and amperometric i-t measurement. The influential factors, including the electropolymerization cycles, the scanning rate, the amount of SiO(2)NPs, and the incubation time of SiO(2)NPs in HF solution were optimized. Under the optimized conditions, the sensor could recognize EP from other structurally similar compounds. A good linearity was obtained in the range of 3.0 x 10(-7)-1.0 x 10(-3) M with a detection limit of 3.0 x 10(-8) M. The MIPs based sensor showed high sensitivity, good selectivity and satisfactory reproducibility for EP determination.
引用
收藏
页码:7803 / 7808
页数:6
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