Department of Chemistry, College of Science, Sultan Qaboos University, Box 36, Al-Khod, Oman.
Luminescence. 2022 Jul;37(7):1087-1097. doi: 10.1002/bio.4261. Epub 2022 May 1.
Here, a simple and portable paper-based analytical device (PAD) based on the inherent capability of carbon quantum dots (CQDs) to serve as a great emitter for the bis(2,4,6-trichlorophenyl)oxalate (TCPO)-hydrogen peroxide (H₂O₂) chemiluminescence (CL) reaction is introduced for the detection of harmful mercury ions (Hg ). The energy is transferred from the unstable reaction intermediate (1,2-dioxetanedione) to CQDs, as acceptors, and an intensive orange-red CL emission is generated at ~600 nm, which is equal to the fluorescence emission wavelength of CQDs. The analytical applicability of this system was examined for the determination of Hg . It was observed that Hg could significantly quench the produced emission, which can be attributed to the formation of a stable and nonluminescent Hg -CQDs complex. Accordingly, a simple and rapid PAD was established for monitoring Hg , with a limit of detection of 0.04 μg ml . No interfering effect on the signal was found from other examined cations, indicating the acceptable specificity of the method. The designed assay was appropriately utilized to detect Hg ions in cosmetic samples with high efficiency. It was characterized by its low cost, ease of use, and was facile but accurate and high selective for the detection of Hg ions. In addition, the portability of this probe makes it suitable for on-site screening purposes.
本文介绍了一种基于碳量子点（CQDs）固有发光能力的简单便携的纸基分析器件（PAD），用于检测有害汞离子（Hg ）。该器件可将双（2,4,6-三氯苯基）草酸酯（TCPO）-过氧化氢（H₂O₂）化学发光（CL）反应中的能量转移到 CQDs 作为受体，从而产生强烈的橙红色 CL 发射，发射波长在~600nm，与 CQDs 的荧光发射波长相同。该系统的分析适用性已通过 Hg 的测定进行了检验。结果表明，Hg 可以显著猝灭产生的发射，这归因于形成稳定的非发光 Hg-CQDs 配合物。因此，建立了一种简单快速的 PAD 用于监测 Hg ，其检测限为 0.04μgml。从其他检测阳离子中未发现对信号有干扰影响，表明该方法具有良好的选择性。所设计的测定法可用于高效检测化妆品样品中的 Hg 离子。该测定法具有成本低、使用方便的特点，并且对 Hg 离子的检测具有简单、准确和高选择性。此外，该探针的便携性使其适用于现场筛选目的。
