A wireless self-powered glucose monitoring biosystem

Abstract

Herein, we report a novel self-powered glucose monitoring biosystem constructed using a hybrid biofuel cell consisting of colloidal platinum coated gold microwire (Au-co-Pt) as the anode and the biocathode consists of a network of multiwalled carbon nanotubes (MWCNTs) immobilized with bilirubin oxidase. The hybrid system displayed a linear correlation (r2 = 0.992) in the presence of glucose concentration ranging from 2 mM to 54 mM. A sensitivity of 1.5 μA mM−1 was achieved. A charge pump circuit consisting of a blinking LED was connected to the biofuel cell. The blinking frequency of the LED corresponds to the glucose concentration. An android mobile phone camera application was used to measure the LED blinking frequency which was in turn converted into the glucose concentration readings using image processing and MATLAB. This enables the end user to be notified via text message.