Chemiluminescent acridinium esters (AEs) permit the development of high sensitivity ligand binding assays due to a combination of high intensity light emission and very low backgrounds. Here these advantages are exploited for use in homogeneous nucleic acid hybridisation assays using quenched chemiluminescence. AE chemiluminescence is conventionally initiated at highly alkaline pH. Novel “active” AEs were designed that permit initiation under conditions compatible with maintenance of nucleic acid hybrids (i.e. pH less than 9). Methyl red was found to be a dark quencher species capable of functioning at this pH. Practical application of the chemiluminescence quenching assay system has been demonstrated using two model nucleic acid hybridisation assays based on intra- and intermolecular emitter/quencher pairs.
化学发光
吖啶鎓酯(AE)具有高强度发光和极低背景的特点,因此可以开发高灵敏度的
配体结合检测方法。在这里,我们将利用这些优势,使用淬灭
化学发光法进行均相核酸杂交检测。AE
化学发光通常在高碱性 pH 下启动。我们设计了新型 "活性 "AE,可在与维持核酸杂交相适应的条件下(即 pH 值小于 9)启动。研究发现,
甲基红是一种能在这种 pH 值下发挥作用的暗色淬灭剂。
化学发光淬灭测定系统的实际应用已通过两种基于分子内和分子间发射器/淬灭器对的核酸杂交测定模型得到了验证。