Disposable sensors based on chitosan film doped with multi-wall carbon nanotubes

This paper reports on the analytical performance of a disposable electrochemical sensor for the detection of hydrogen peroxide, using screen-printed carbon based electrodes (SPCEs) modified with a dispersion of multi-wall carbon nanotubes in chitosan (CHIT/MWCNT). The modified sensors showed an excellent electrocatalytic activity towards hydrogen peroxide, respect to the high overvoltage characterizing unmodified screen-printed sensors. The modified electrode demonstrated to be highly reproducible, with 4.5% RSD for the sensitivity of hydrogen peroxide for 15 electrodes prepared using the same dispersion conditions. Preliminary experiments carried out using choline oxidase as biorecognition element has allowed us to obtain an excellent performance for choline biosensing.