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Graphical illustration of type I and type II photochemical reactions of BBR. The value of absorption and fluorescence was detected in MeCN. BBR, berberine; 1BBR*, excited state of BBR; 3BBR*, triple excited state of BBR; 1O2, singlet oxygen; 3O2, triplet oxygen; O2•−, superoxide radical anion; H2O2, hydrogen peroxide; •OH, hydroxyl radicals.
