FIGURE 4.

Fenton’s reagent-induced UPE measured using visible PMT from the porcine skin sample. (A) Kinetics of UPE was measured after the topical application of Fenton’s reagent (100 μM H₂O₂ containing 500 μM FeSO₄). (B) Kinetics of UPE was measured after the topical application of Fenton’s reagent (1 mM H₂O₂ containing 500 μM FeSO₄). (C) Kinetics of UPE was measured in the presence of sodium ascorbate (5 mM) applied to the skin prior to topical application of Fenton’s reagent (1 mM H₂O₂ containing 500 μM FeSO₄). The decay curve was measured for a duration of 30 min. The arrow indicates the application of chemicals.