Nitrogen-Doped Chiral CuO/CoO Nanofibers: An Enhanced Electrochemiluminescence Sensing Strategy for Detection of 3,4-Dihydroxy-Phenylalanine Enantiomers
作者:Yanxia Song、Siyu Lu、Jun Hai、Kun Liang、Shihao Sun、Genping Meng、Baodui Wang
DOI:10.1021/acs.analchem.1c01497
日期:2021.8.24
l-3,4-Dihydroxy-phenylalanine (l-DOPA) is the most effective drug for the treatment of Parkinson’s disease, which plays a very important role in clinical and neurochemistry. However, how to achieve high-sensitivity recognition of l-DOPA still faces challenges. Here, a facile strategy is presented to construct nitrogen-doped chiral CuO/CoO nanofibers (N-CuO/CoO NFs) with nanozyme activity and electrochemiluminescence property, in which CuO/CoO NFs are used as the catalytic activity center and chiral cysteine (Cys) is used as the inducer of chiral recognition, for enantioselective catalysis and sensitive recognition of DOPA enantiomers. Notably, N doping not only enhances the enzyme-mimic activity of CuO/CoO NFs but also amplifies their electrochemiluminescence (ECL) signals in the presence of luminol. More importantly, in the presence of DOPA enantiomers, the d-cysteine (d-Cys)-modified N-CuO/CoO NFs exhibit different ECL performances; thus, d-Cys@N-CuO/CoO NFs could selectively distinguish and sensitively detect l-DOPA through ECL signals, and the detection limit is 0.29 nM for l-DOPA. In addition, it also showed good sensing performance for the determination of l-DOPA in fetal bovine serum. This is the first report on the detection of DOPA enantiomers based on an enhanced ECL strategy, providing a robust pathway for chiral discrimination and detection of chiral molecules.
l-3,4-二羟基苯丙氨酸(l-DOPA)是治疗帕金森病的最有效药物,具有重要的临床和神经化学意义。然而,如何实现对l-DOPA的高灵敏度识别仍然面临挑战。在此,我们提出了一种简单的策略,构建氮掺杂的手性CuO/CoO纳米纤维(N-CuO/CoO NFs),具有纳米酶活性和电化学发光特性,其中CuO/CoO NFs作为催化活性中心,手性半胱氨酸(Cys)作为手性识别的诱导剂,用于对DOPA对映体的选择性催化和敏感识别。值得注意的是,氮掺杂不仅增强了CuO/CoO NFs的酶模仿活性,还在发光检测试剂(如鲁米诺)的存在下放大了它们的电化学发光(ECL)信号。更重要的是,在DOPA对映体存在的情况下,修饰了d-半胱氨酸(d-Cys)的N-CuO/CoO NFs表现出不同的ECL性能;因此,d-Cys@N-CuO/CoO NFs能够通过ECL信号选择性区分和敏感检测l-DOPA,检测限为0.29 nM。此外,它在胎牛血清中对l-DOPA的测定也显示出良好的传感性能。这是基于增强ECL策略检测DOPA对映体的首次报告,为手性分子的手性区分和检测提供了一条稳健的途径。