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Electrogenerated chemiluminese ethanol biosensor based on carbon nanotube-titania-nafion composite film

机译：基于碳纳米管-二氧化钛-纳米复合膜的电生化学发光乙醇生物传感器

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摘要

Mesoporous titania-Nafion composite doped with carbon nanotube (CNT) has been used for the immobilization of tris(2,2'-bipyridyl)ruthenium(II) (Ru(bpy)(3)(2+)) and alcohol dehydrogenase on an electrode surface to yield a highly sensitive and stable electrogenerated chemiluminescence (ECL) ethanol biosensor. The presence of CNT in the composite film increases not only the sensitivity of the ECL biosensor but also the long-term stability of the biosensor. The present biosensor responds linearly to ethanol in the wide concentration ranges from 1.0 x 10(-5) M to 1.0 x 10(-1) M with a detection limit of 5.0 x 10(-6) M (S/N= 3). The present ECL ethanol biosensor exhibited higher ECL response compared to that obtained with the ECL biosensor based on the corresponding composite without CNT. The present CNT-based ECL biosensor showed good long-term stability with 75% of its initial activity retained after 2 weeks of storage in 50 mM phosphate buffer at pH 7.0.
机译：掺杂有碳纳米管（CNT）的介孔二氧化钛-Nafion复合材料已用于固定三（2,2'-联吡啶基）钌（II）（Ru（bpy）（3）（2+））和乙醇脱氢酶电极表面产生高度灵敏且稳定的电化学发光（ECL）乙醇生物传感器。复合膜中CNT的存在不仅增加了ECL生物传感器的灵敏度，而且还提高了生物传感器的长期稳定性。本生物传感器在1.0 x 10（-5）M至1.0 x 10（-1）M的宽浓度范围内对乙醇线性响应，检测极限为5.0 x 10（-6）M（S / N = 3） 。与使用基于不含CNT的相应复合物的ECL生物传感器所获得的相比，本ECL乙醇生物传感器表现出更高的ECL响应。当前的基于CNT的ECL生物传感器显示出良好的长期稳定性，其初始活性的75％在50 mM磷酸盐缓冲液（pH 7.0）中保存2周后得以保留。

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