PS triplet excited state can undergo electron transfer generating superoxide, hydrogen peroxide and hydroxyl radicals (Type I reaction) or can undergo energy transfer to molecular oxygen producing highly cytotoxic singlet oxygen (Type II reaction).
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| Figure 2: Jablonski diagram of photosensitizer (PS) excited states and their
interaction with molecular oxygen. PS triplet excited state can undergo electron transfer generating superoxide, hydrogen peroxide and hydroxyl radicals (Type I reaction) or can undergo energy transfer to molecular oxygen producing highly cytotoxic singlet oxygen (Type II reaction). |
