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基于碳纳米管修饰的相变微胶囊的热自调节智能生物传感器,用于增强葡萄糖检测。

Thermal self-regulatory intelligent biosensor based on carbon-nanotubes-decorated phase-change microcapsules for enhancement of glucose detection.

机构信息

State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China.

State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China.

出版信息

Biosens Bioelectron. 2022 Jan 1;195:113586. doi: 10.1016/j.bios.2021.113586. Epub 2021 Aug 24.

Abstract

Enzyme-based biosensors are sensitive to temperature due to their strong temperature dependency of catalytic activity. Aiming at enhancing biosensing detection for glucose assay over a wide range of applicable temperatures, we designed a thermal self-regulatory intelligent biosensor through an innovative integration of phase change material (PCM) and bioelectrocatalytic substances. An electroactive phase-change microcapsule system was firstly fabricated by microencapsulating n-docosane as a PCM core in the SiO shell, followed by depositing polydopamine along with carbon nanotubes as an electroactive layer on the surface of SiO shell. The resultant microcapsules showed a regularly spherical morphology and well-defined core-shell microstructure. They also exhibited a satisfactory latent heat capacity of around 137 J/g for implementing temperature regulation with a good working stability. An electrochemical biosensing system was constructed with the resultant electroactive microcapsules together with glucose oxidase as a redox enzyme, achieving a thermal self-regulation capability to enhance the biosensing detection of glucose under in-situ thermal management at higher temperatures. With a high sensitivity of 5.95 μA⋅mM⋅cm and a lower detection limit of 13.11 μM at 60 °C, the intelligent biosensor developed by this study demonstrated a superior determination capability and better detection performance toward glucose than conventional biosensors in a high temperature region thanks to effective regulation of microenvironment temperature in the electrode system. This study provides a promising strategy for the development of thermal self-regulatory smart biosensors with an enhanced identification ability to detect various chemical substances over a wide range of applicable temperatures.

摘要

基于酶的生物传感器对温度敏感,因为它们的催化活性对温度有很强的依赖性。为了在较宽的适用温度范围内增强葡萄糖分析的生物传感检测,我们通过将相变材料 (PCM) 和生物电化学物质创新地集成在一起,设计了一种热自调节智能生物传感器。首先通过将正二十二烷作为 PCM 核微囊化在 SiO 壳中,制备了电活性相变微胶囊体系,然后在 SiO 壳表面沉积聚多巴胺和碳纳米管作为电活性层。所得微胶囊具有规则的球形形态和明确的核壳结构。它们还表现出约 137 J/g 的令人满意的潜热容量,用于实施温度调节,具有良好的工作稳定性。构建了一个电化学生物传感系统,使用所得的电活性微胶囊和葡萄糖氧化酶作为氧化还原酶,实现了热自调节能力,可在原位热管理下增强高温下葡萄糖的生物传感检测。该研究开发的智能生物传感器在 60°C 时具有 5.95 μA⋅mM⋅cm 的高灵敏度和 13.11 μM 的低检测限,与传统生物传感器相比,在高温区域具有优越的葡萄糖测定能力和更好的检测性能,这得益于电极系统中微环境温度的有效调节。本研究为开发具有增强识别能力的热自调节智能生物传感器提供了一种有前途的策略,可在较宽的适用温度范围内检测各种化学物质。

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