Lighting Up Electrochemiluminescence-Inactive Dyes via Grafting Enabled by Intramolecular Resonance Energy Transfer
作者:Yongjun Zheng、Hong Yang、Lufang Zhao、Yuhan Bai、Xinghua Chen、Kaiqing Wu、Songqin Liu、Yanfei Shen、Yuanjian Zhang
DOI:10.1021/acs.analchem.1c05235
日期:2022.2.22
Due to near-zero optical background and photobleaching, electrochemiluminescence (ECL), an optical phenomenon excited by electrochemical reactions, has drawn extensive attention, especially for ultrasensitive bioassays. Developing diverse ECL emitters is crucial to unlocking their multiformity and performances but remains a formidable challenge due to the rigorous requirements for ECL. Herein, we report a general strategy to light up ECL-inactive dyes in an aqueous solution via grafting, a well-developed concept for plant propagation since 500 BCE. As a proof of concept, a series of luminol donor–dye acceptor-based ECL emitters were grafted with near-unity resonance energy transfer (RET) efficiency and coarse/fine-tunable emission wavelengths. Rather than the sophisticated design of new skeleton-based molecules to meet all of the prerequisites for ECL in a constrained manner, each unit in the proposed ECL ensemble performed its functions maximally. As a result, beyond traditional two-dimensional (2D) ones, a three-dimensional (3D) coordinate biosensing system, simultaneously showing a calibration curve and selectivity, was established using the new ECL emitter. This lighting up strategy would generally address the scarcity of ECL emitters and enable unprecedented functions.
由于近乎零的光学背景和光漂白,电化学发光(ECL)作为一种由电化学反应激发的光学现象,受到了广泛关注,特别是在超灵敏生物测定方面。开发多样化的ECL发射体对于发挥其多样性和性能至关重要,但由于ECL的严格要求,这仍然是一个艰巨的挑战。在此,我们报告了一种通用策略,通过嫁接使水溶液中的ECL不活跃染料发光,这一概念自公元前500年以来已被广泛应用于植物繁殖。作为概念验证,我们嫁接了一系列基于发光氨基酚-染料接受体的ECL发射体,具有近乎完美的共振能量转移(RET)效率和粗细可调的发射波长。与其在受限情况下复杂设计的新骨架分子以满足ECL的所有前提条件,不如让所提出的ECL集合中的每个单元最大限度地发挥其功能。因此,超越传统的二维(2D)系统,利用新的ECL发射体建立了一个三维(3D)坐标生物传感系统,能够同时显示校准曲线和选择性。这种点亮策略将普遍解决ECL发射体的稀缺问题,并使前所未有的功能得以实现。