Novel Sustainable Cellulose Acetate Based Biosensor for Glucose Detection.

In this study, green zinc oxide (ZnO)/polypyrrole (Ppy)/cellulose acetate (CA) film has been synthesized via solvent casting. This film was used as supporting material for glucose oxidase (GOx) to sensitize a glucose biosensor. ZnO nanoparticles have been prepared via the green route using olive leaves extract as a reductant. ZnO/Ppy nanocomposite has been synthesized by a simple in-situ chemical oxidative polymerization of pyrrole (Py) monomer using ferric chloride (FeCl₃) as an oxidizing agent. The produced materials and the composite films were characterized using X-ray diffraction analysis (XRD), scanning electron microscope (SEM), Fourier transform infrared (FTIR) and thermogravimetric analysis (TGA). Glucose oxidase was successfully immobilized on the surface of the prepared film and then ZnO/Ppy/CA/GOx composite was sputtered with platinum electrode for the current determination at different initial concentrations of glucose. Current measurements proved the suitability and the high sensitivity of the constructed biosensor for the detection of glucose levels in different samples. The performance of the prepared biosensor has been assessed by measuring and comparing glucose concentrations up to 800 ppm. The results affirmed the reliability of the developed biosensor towards real samples which suggests the wide-scale application of the proposed biosensor. [ABSTRACT FROM AUTHOR]