Abstract
A phenylboronic acid (PBA)/polyvinyl alcohol (PVA) dispersion was prepared by mixing PBA and PVA solutions. The PVA/PBA conjugate precipitated due to binding of several PBAs to PVA and reduction of solubility. The formation of the PVA/PBA dispersion was affected by the ratio of PBA to PVA, the ionic strength, and the pH. The aim of this study was to investigate the sugar and H2O2 response of the dispersion. The optical density (OD) of the PVA/PBA dispersion decreased by addition of fructose, which replaced PVA in the boronate ester by competitive interaction. The PVA/PBA dispersion was also dissolved by addition of H2O2, because the boronate ester bond was cleaved by the oxidative reaction of H2O2. The PVA/PBA dispersion completely dissolved in 10 mM fructose and 3.0 mM H2O2. In addition, the PVA/PBA dispersion responded to 10 mM glucose under glucose oxidase containing conditions. Functional PBA material was prepared by simple operation.
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