Precise positioning of enzymes within hierarchical polymer nanostructures for switchable bioelectrocatalysis

Fengjin Qu, Xiaoyan Ma, Julien E. Gautrot

科研成果: 期刊稿件文章同行评审

11 引用 (Scopus)

摘要

The ability to reversibly switch bioelectrocatalytic sensors is attractive for the design of biomonitoring platforms displaying a complex environmental response, or for the protection of biosensors. However, the retention of reversible biocatalytic properties upon multiple environmental cycles, with broad detection range, low signal-to-noise and limit of detection remains challenging. In this report, we demonstrate the precise positioning of the enzyme glucose oxidase within block-copolymer brush nanostructures, via the re-initiation of N-isopropylacrylamide (NIPAM) polymerisation from enzyme-decorated poly(dimethylaminoethyl methacrylate) (PDMAEMA) blocks. We find that the precise design of polymer brush grafting density, thickness and crosslinking of the PNIPAM block enables the stable positioning of biocatalytic sites close to electrode surfaces. The control of the polymer brush nanostructure, its conformation and the distribution of biocatalytic sites is characterised via a combination of in situ ellipsometry, X-ray photoelectron spectroscopy, grazing angle FTIR and surface plasmon resonance. In turn, cyclic voltammetry and electrochemical impedance spectroscopy demonstrate that such control of the polymeric nanostructures confers a unique combination of low limit of detection (23.9 μM), a broad dynamic range of glucose sensing (0.05–12.8 mM) and true “OFF” state upon pH or thermal stimulation, whilst retaining excellent performance over repeated switching cycles of the sensor. Therefore, hierarchical biocatalytic polymer brushes display unique properties for the design of responsive biosensors and complex multi-functional gating platforms.

源语言英语
文章编号113045
期刊Biosensors and Bioelectronics
179
DOI
出版状态已出版 - 1 5月 2021

指纹

探究 'Precise positioning of enzymes within hierarchical polymer nanostructures for switchable bioelectrocatalysis' 的科研主题。它们共同构成独一无二的指纹。

引用此