期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 16, 页码 13349-13354出版社
AMER CHEMICAL SOC
DOI: 10.1021/am504561d
关键词
biocatalytic electrode; signal-activated electrode; drug-mimicking release; glucose electrode; alginate electrode
资金
- NSF [CBET-1066397]
- Ministerio de Economia e Innovacion [CTQ2012-34238]
A biocatalytic electrode activated by pH signals was prepared with a multilayered nanostructured interface including PQQ:dependent glucose dehydrogenase (PQQ: GDH) directly associated with the conducting support and 2 glucose oxidase (GOx) located on the external interface. GOx was immobilized through a pH-signal-cleavable linker composed of an iminobiotin/avidin complex. In the presence of GOx, glucose was intercepted at the external interface and biocatalytically oxidized without current generation, thus keeping the electrode in its nonactive state. When the pH value was lowered from pH 7.5 to 4.5 the iminobiotin/avidin complex was cleaved and GOx was removed from the interface allowing glucose penetration to the electrode surface where it was oxidized by PQQ:GDH yielding a bioelectrocatalytic current, thus switching the electrode to its active state. This process was used to trigger a drug-mimicking release process from another connected electrode. Furthermore, the pH-switchable electrode can be activated by biochemical signals logically processed by biocatalytic systems mimicking various Boolean gates. Therefore, the developed switchable electrode can interface biomolecular computing/sensing systems with drug-release processes.
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