Figure 4: Plot of the value Ip (peak current intensity) of the SW-voltammograms curves (described in figure 2) as a function of the increasing concentrations of GSH (12.5-187.5 μmol/L) dissolved in 0.1 mol/L phosphate buffer (pH 7.5). The linear regression is described in the text. Error bars denote standard deviation from 5 independent experiments.