Abstract
Alizarin red S (ARS) was confined in layer-by-layer (LbL) films composed of phenylboronic acid-modified poly(ethyleneimine) (PBA-PEI) and carboxymethylcellulose (CMC) to study the voltammetric response to diol and polyol compounds. The LbL film-coated gold (Au) electrode and quartz slide were immersed in an ARS solution to uptake ARS into the film. UV-visible absorption spectra of ARS-confined LbL film suggested that ARS formed boronate ester (ARS-PBS) in the film. The cyclic voltammetry of the ARS-confined LbL film-coated electrodes exhibited oxidation peaks at −0.50 and −0.62 V, which were ascribed to the oxidation reactions of ARS-PBS and free ARS, respectively, in the LbL film. The peak current at −0.62 V increased upon the addition of diol or polyol compounds such as L-dopa, glucose, and sorbitol into the solution, depending on the concentration, whereas the peak current at −0.50 V decreased. The results suggest a possible use of ARS-confined PBA-PEI/CMC LbL film-coated Au electrodes for the construction of voltammetric sensors for diol and polyol compounds.
Highlights
The Polyelectrolyte multilayer films prepared by a layer-by-layer (LbL) deposition technique have attracted much attention because of their facile preparation and potential applications to thin film devices [1,2,3,4,5]
LbL films composed of phenylboronic acid-modified poly(ethyleneimine) (PBA-PEI) and CMC were coated on the surface of the Au disc electrode which had been polished with alumina slurry and thoroughly rinsed in deionized water
The 10.5-bilayer (PBA-PEI/CMC)10 phenylboronic acid (PBA)-PEI films were deposited on the surface of a quartz slide to record the UV-visible spectra with and without alizarin red S (ARS)
Summary
The Polyelectrolyte multilayer films prepared by a layer-by-layer (LbL) deposition technique have attracted much attention because of their facile preparation and potential applications to thin film devices [1,2,3,4,5]. LbL films are currently widely used for the development of surface coatings [12], drug delivery systems [13], biosensors [14] and so forth. In this context, we have recently prepared redox-active LbL films that contain alizarin red S (ARS) (Figure 1) [15]. ARS was confined in the LbL films composed of poly(ethyleneimine) (PEI) and carboxymethylcellulose (CMC). Through an electrostatic affinity between negatively charged ARS and positive charges in the PEI/CMC films. The ARS-modified PEI/CMC film-coated gold (Au) electrodes exhibited electrochemical responses originating from the redox reactions of the 9,10-anthraquinone moiety in ARS (Figure 1)
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