Digital image colorimetry method for determination of glucose using silver nanoparticles immobilized into polymethacrylate matrix

We suggest Ag⁰ nanoparticles immobilized into transparent polymethacrylate matrix (PMM–Ag⁰) as a simple colorimetric sensor for determination of glucose. We demonstrate the capabilities of a smartphone to process the images and further analyze the information obtained by determination of glucose using PMM–Ag⁰ sensor. The method can be employed for glucose concentrations of 0.1–4.3 mmol dm⁻³, while its detection limit is 0.05 mmol dm⁻³.