The surface of a gold (Au) disk electrode was coated with a layered thin film consisting of poly(allylamine) bearing phenylboronic acid (PBA) moieties in the side chains to fabricate a voltammetric sensor sensitive to sugars. The modified Au electrode exhibited a voltammetric response to sugars in the presence of [Fe(CN)6]3- ion in the sample solution at a neutral pH. The peak current of the cyclic voltammograms decreased depending on the type and concentration of sugars, as a result of the formation of PBA-sugar adduct on the surface of the film. The dynamic range of the electrode is 1-100 mM for glucose and 0.1-10 mM for fructose, the sensitivity being ca. 5 μA/decade for glucose and ca. 6 μA/decade for fructose.
- Phenylboronic acid
- Sugar sensor
- Thin film
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Signal Processing
- Control and Systems Engineering