A Highly Sensitive Amperometric Galactose Biosensor Based on Graphene-doped Sol-gel-derived Titania-Nafion Composite Films,Electroanalysis

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A Highly Sensitive Amperometric Galactose Biosensor Based on Graphene-doped Sol-gel-derived Titania-Nafion Composite Films
Electroanalysis ( IF 2.7 ) Pub Date : 2021-09-03 , DOI: 10.1002/elan.202100357
Sumin Lee ₁ , Daeho Jeong ₁ , Sangjung Lee ₁ , Sungju Nam ₁ , Won-Yong Lee ₁

Affiliation

A highly sensitive amperometric galactose biosensor was developed by encapsulating galactose oxidase within the graphene-doped sol-gel titania-Nafion composite film on platinized glassy carbon electrode. Due to the combined electrocatalytic activity of graphene and Pt NPs on the electrode towards hydrogen peroxide as well as the mesoporous nature of the titania-Nafion composite, the present galactose biosensor exhibited relatively fast response time under 2 s, high sensitivity of 40.6 mAM⁻¹cm⁻², and wide dynamic range over three orders of magnitude with a detection limit of 3.78×10⁻⁶ M (S/N=3). In addition, the biocompatible composite in the biosensor secures excellent long-term stability.

中文翻译：

基于石墨烯掺杂溶胶-凝胶衍生二氧化钛-Nafion复合膜的高灵敏度电流型半乳糖生物传感器

通过将半乳糖氧化酶封装在镀铂玻璃碳电极上的石墨烯掺杂溶胶-凝胶二氧化钛-Nafion 复合膜中，开发了一种高灵敏度的电流型半乳糖生物传感器。由于石墨烯和 Pt NPs 在电极上对过氧化氢的联合电催化活性以及二氧化钛-Nafion 复合材料的介孔性质，本发明的半乳糖生物传感器在 2 秒内表现出相对较快的响应时间，40.6 mAM ^-1的高灵敏度cm ^-2，以及超过三个数量级的宽动态范围，检测限为3.78×10 ^-6 M (S/N=3)。此外，生物传感器中的生物相容性复合材料确保了出色的长期稳定性。

更新日期：2021-09-03

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