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在镨离子存在下,竹红菌甲素诱导的9,10-DPA光敏氧化被抑制的过程表明,甲素的瞬时荧光可被镨离子猝灭,其荧光寿命不随猝灭剂浓度的变化而改变,表现出静态猝灭的特征;甲素热活化的延迟荧光可被镨甲素配合物有效地猝灭,延迟荧光寿命由无猝灭剂下的1744±50ns缩减到有O_2存在下的700±50ns和有Pr~(3+)存在下的500±50ns,具有动态猝灭特征。比较单重态氧的氧化产物和反应底物的双倒数关系表明,错甲素配合物既可猝灭甲素激发三重态,也可猝灭单重态氧,从而有效地抑制光敏氧化反应。
In the presence of praseodymium ions, the hypocrellin-induced photosensitization of 9,10-DPA was inhibited, indicating that the transient fluorescence of a-form can be quenched by praseodymium ions and its fluorescence lifetime does not change with the quencher concentration , Showing the characteristic of static quenching. The delayed fluorescence of a-heat activation can be effectively quenched by the praseodymium-a complex and the delayed fluorescence lifetime is reduced from 1744 ± 50 ns without quencher to 700 ± with the presence of O 2 50ns and Pr ~ (3+) in the presence of 500 ± 50ns, with dynamic quenching characteristics. Comparing the double-reciprocal relationship between the oxidation products of oxygen and oxygen, the results showed that the complexes could quench the excitation triplet state of a-form and also quench the singlet oxygen, thus effectively inhibiting the photo-oxidation reaction.