Development of an electrochemical ascorbic acid sensor based on the incorporation of a ferricyanide mediator with a polyelectrolyte–calcium carbonate microsphere
Development of an electrochemical ascorbic acid sensor based on the incorporation of a ferricyanide mediator with a polyelectrolyte–calcium carbonate microsphere
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DOI：
10.1016/j.electacta.2009.09.049
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发表时间：
2010
影响因子：
6.6
通讯作者：
Feng Li;Chen‐Yu Tang;Shufeng Liu;Guangran Ma
中科院分区：
文献类型：
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作者：
Feng Li;Chen‐Yu Tang;Shufeng Liu;Guangran Ma
通过静电相互作用将 Fe(CN)63−离子负载到聚（烯丙胺）盐酸盐（PAH）层上，成功制备了一种新型电活性材料，该材料首先组装在制备的聚（4-苯乙烯磺酸钠）（PSS）掺杂的多孔碳酸钙（CaCO3）微球上。此外，利用嵌入壳聚糖（CS）溶胶-凝胶基质作为电子介体的上述电活性材料构建了用于抗坏血酸（AA）检测的电化学传感器。在0.27V电位下观察到铁氰化物对AA的电催化氧化，与在玻碳电极上直接电化学氧化AA相比，该电位发生负移。对测试溶液的pH值和检测AA的施加电位等实验参数进行了优化。目前的电化学传感器不仅表现出良好的重现性和存储稳定性，而且在线性范围（1.0×10−6至2.143×10−3M）内对AA表现出快速的电流响应、低检测限（7.0×10−7M）、快速响应时间（<6s）和高灵敏度（−4.5127μAmM−1）。
A novel electro-active material was successfully prepared with Fe(CN)63−ions loaded by electrostatic interaction onto the layer of poly(allylamine) hydrochloride (PAH), which was first assembled on prepared poly(sodium 4-styrenesulfonate) (PSS)-doped porous calcium carbonate (CaCO3) microspheres. Further, an electrochemical sensor for use in ascorbic acid (AA) detection was constructed with the use of the above electro-active materials embedded into a chitosan (CS) sol–gel matrix as an electron mediator. The electrocatalytic oxidation of AA by ferricyanide was observed at the potential of 0.27V, which was negative-shifted compared with that by direct electrochemical oxidation of AA on a glassy carbon electrode. The experimental parameters, including the pH value of testing solution and the applied potential for detection of AA, were optimized. The current electrochemical sensor not only exhibited a good reproducibility and storage stability, but also showed a fast amperometric response to AA in a linear range (1.0×10−6to 2.143×10−3M), a low detection limit (7.0×10−7M), a fast response time (<6s), and a high sensitivity (−4.5127μAmM−1).