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Functionalization of poly-SNS-anchored carboxylic acid with Lys and PAMAM: surface modifications for biomolecule immobilization/stabilization and bio-sensing applications
Date
2012-01-01
Author
DEMİRCİ, Sema
EMRE, FATMA BİLGE
EKİZ, Fulya
OĞUZKAYA, Funda
TİMUR, SUNA
Tanyeli, Cihangir
Toppare, Levent Kamil
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
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Poly(2-(2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl) (SNS) acetic acid) was electrochemically deposited on graphite electrodes and functionalized with lysine (Lys) amino acid and poly(amidoamine) derivatives (PAMAM G2 and PAMAM G4) to investigate their matrix properties for biosensor applications. Glucose oxidase (GOx) was immobilized onto the modified surface as the model enzyme. X-Ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) were used to report the surface properties of the matrices in each step of the biosensor construction. The biosensors were characterized in terms of their operational and storage stabilities and the kinetic parameters (K-m(app) and I-max). Three new glucose biosensors revealed good stability, featuring low detection limits (19.0 mu M, 3.47 mu M and 2.93 mu M for lysine-, PAMAM G2- and PAMAM G4-functionalized electrodes, respectively) and prolonged the shelf lives (4, 5, and 6 weeks for Lys-, PAMAM G2- and PAMAM G4-modified electrodes, respectively). The proposed biosensors were tested for glucose detection on real human blood serum samples.
Subject Keywords
Glucose-oxidase
,
Carbon nanotubes
,
Conducting polymer
,
Hydrogen-peroxide
,
Biosensor
,
Dendrimers
,
Monolayers
,
Biocatalyst
,
Matrix
,
Film
URI
https://hdl.handle.net/11511/39422
Journal
ANALYST
DOI
https://doi.org/10.1039/c2an35472a
Collections
Department of Chemistry, Article