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Poly(3,4-ethylenedioxythiophene) Bearing Pyridylboronic Acid Group for Specific Recognition of Sialic Acid
- Source :
- Langmuir : the ACS journal of surfaces and colloids. 36(2)
- Publication Year :
- 2019
-
Abstract
- Conducting polymers tethered with molecular recognition elements are good candidates for biosensing applications such as detecting a target molecule with selectivity. We develop a new monomer, namely, 3,4-ethylenedioxythiophene bearing a pyridylboronic acid moiety (EDOT-PyBA), for label-free detection of sialic acid as a cancer biomarker. PyBA, which is known to show specific binding to sialic acid in acid conditions is used as a synthetic ligand instead of lectins. PyBA confirms the enhanced binding affinity for sialic acid at pH 5.0-6.0 compared with traditional phenylboronic acid. Poly(EDOT-PyBA) is electrodeposited on a planar glassy carbon electrode and the obtained film is successfully characterized by X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy, water contact angle measurements, and electrochemical impedance spectroscopy. The specific interaction of PyBA with sialic acid at the solution/electrode interface is detected by differential pulse voltammetry in a dynamic range 0.1-3.0 mM with a detection limit of 0.1 mM for a detection time of 3 min. The sensitivity covers the total level of free sialic acid in human serum and the assay time is the shorter than that of other methods. The poly(EDOT-PyBA) electrode successfully detects spiked sialic acid in human serum samples. Owing to its processability, mass productivity, and robustness, polythiophene conjugated with "boronolectin" is a candidate material for developing point-of-care and wearable biosensors.
- Subjects :
- Detection limit
02 engineering and technology
Surfaces and Interfaces
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Combinatorial chemistry
0104 chemical sciences
Sialic acid
chemistry.chemical_compound
Molecular recognition
chemistry
Electrochemistry
Polythiophene
General Materials Science
Differential pulse voltammetry
Phenylboronic acid
0210 nano-technology
Biosensor
Spectroscopy
Poly(3,4-ethylenedioxythiophene)
Subjects
Details
- ISSN :
- 15205827
- Volume :
- 36
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Langmuir : the ACS journal of surfaces and colloids
- Accession number :
- edsair.doi.dedup.....3ca5da710604048416461d2ef75b092d