Stable Dioxetane Precursors as Selective Trap-and-Trigger Chemiluminescent Probes for Singlet Oxygen
作者:Laura A. MacManus-Spencer、Douglas E. Latch、Kim M. Kroncke、Kristopher McNeill
DOI:10.1021/ac048293s
日期:2005.2.1
A set of highly selective chemiluminescent probes has been developed for the detection and quantitation of singlet oxygen (1O2), a reactive oxygen species that is known to transform organic pollutants in the aquatic environment and elicits cytotoxic effects in biological systems. In this study, a trap-and-trigger detection method is employed, based on the reaction of 1O2 with a spiroadamantyl-substituted vinyl ether probe to form the corresponding thermally stable dioxetane, which undergoes chemiluminescent decomposition upon addition of a chemical trigger. The detection method is highly selective for 1O2 relative to superoxide anion and hydrogen peroxide. The sensitivity of this method allows for the accurate measurement of environmentally relevant (picomolar) steady-state 1O2 concentrations in relatively short exposure times. The detection method was used to detect and quantify 1O2 production in the reaction of dibenzoyl peroxide with superoxide anion.
已知单线态氧(1O2)是一种活性氧,可在水生环境中转化有机污染物,并在生物系统中产生细胞毒性作用。本研究采用了一种捕获-触发检测方法,该方法基于 1O2 与螺烷基金刚烷基取代的乙烯基醚探针反应生成相应的热稳定二氧杂环丁烷,在加入化学触发器后发生化学发光分解。相对于超氧阴离子和过氧化氢,这种检测方法对 1O2 具有高度选择性。这种方法灵敏度高,可在相对较短的暴露时间内精确测量与环境相关的稳态 1O2 浓度(皮摩尔)。该检测方法用于检测和量化二苯甲酰过氧化物与超氧阴离子反应中产生的 1O2。