Synthesis and application of a novel poly-l-phenylalanine electroactive macromonomer as matrix for the biosensing of 'Abused Drug' model

Tulay Yilmaz, Emine Guler, Z. Pinar Gumus, Huseyin Akbulut, Ebru Aldemir, Hakan Coskunol, Demet Goen Colak, Ioan Cianga, Shuhei Yamada, Suna Timur*, Takeshi Endo, Yusuf Yagci

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Polypeptide-functionalized macromonomers are very fascinating candidates for the modification of various surfaces of different sizes as well as geometry, and have attracted considerable attention for biomolecule stabilization, biomedical device fabrication and bioanalytical applications. In the present work, synthesis and characterization of a novel poly-l-phenylalanine-bearing electroactive macromonomer (EDOT-BTDA-PPhe) were carried out. In the following steps, a glassy carbon electrode was covered with this material, and then cocaine aptamer was immobilized to obtain a biofunctional surface for the biosensing of 'Abused Drug' model. Aptamers attached to polypeptide side chains on the macromonomer with good orientation are induced for conformational change into three-way junction form as a result of selective binding of cocaine or its metabolite. This aptamer folding-based conformational response provides detectable signals due to formation of a compact interface which restricts electron transfer of redox probe. The stepwise modification of the surface was confirmed by electrochemical techniques. At the final step, the aptasensor was applied for the electrochemical detection of cocaine and its major metabolite, benzoylecgonine (BE), which exhibited a linear correlation between 1.0 and 10 nM and between 0.5 and 10 μM respectively. The proposed methods were successfully employed for the analysis of synthetic biological fluids.

Original languageEnglish
Pages (from-to)7304-7315
Number of pages12
JournalPolymer Chemistry
Volume7
Issue number47
DOIs
Publication statusPublished - 21 Dec 2016

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2016.

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