Peroxide concentration was measured using a Cerium(IV) sulfate colorimetric assay. Samples were prepared by mixing 175 μL of analyte, 700 μL of 1 mM Ce(IV) solution (in 0.5 M H2SO4), and 875 μL of 0.5 M H2SO4. The UV-visible spectrum (Cary 6000i UV-Vis Spectrometer) was recorded in transmission mode, and the intensity at 318 nm was used to quantify the Ce(IV) concentration in the sample, from which the H2O2 concentration was determined. A linear calibration curve was constructed by measuring analytes of known H2O2 concentration. When necessary, analytes were diluted in 0.5 M sulfuric acid to be within the measurement range of the assay.