For the assay of H2Q, the conjugated polyelectrolyte PPESO3 was diluted to 1.0 mol/L with PBS (pH 7.0), followed by the addition of 2.0 g/mL HRP and 3.0 mmol/L H2O2
For the assay of H2Q, the conjugated polyelectrolyte PPESO3 was diluted to 1.0 mol/L with PBS (pH7.0), followed by the addition of 2.0 g/mL HRP and 3.0 mmol/L H2O2