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Portable Au Nanoparticle-Based Colorimetric Sensor Strip for Rapid On-Site Detection of Cd2+ Ions in Potable Water
BioChip Journal ( IF 5.5 ) Pub Date : 2021-06-18 , DOI: 10.1007/s13206-021-00029-w
Hui Hun Cho , Jun Hyuk Heo , Do Hyeon Jung , So Hui Kim , Su-Jeong Suh , Kwon Hoon Han , Jung Heon Lee

Simple, rapid, and instrument-free detection of cadmium ions (Cd2+) with a portable device is essential to prevent the contamination of potable water. Herein, we propose a simple, fast, and low-cost method for the real-time/on-site detection of Cd2+ using glutathione-modified Au nanoparticles (GSH-AuNPs) deposited on a polyethylene terephthalate (PET) sensor strip. To fabricate the sensor strip, a paint composed of GSH-AuNPs and polyvinylpyrrolidone was prepared. Subsequently, the GSH-AuNP paint was deposited on a mold fixed on the PET substrate and dried in ambient air. The GSH-AuNPs deposited on the PET substrate quickly redispersed in water, turning the water red. However, the GSH-AuNPs aggregated in water samples containing Cd2+, turning the water blue. The limit of detection of this Cd2+ sensor strip is 18.8 nM, which is comparable to the maximum contamination level of 44.5 nM Cd2+ in potable water stipulated by the US Environmental Protection Agency. Finally, we demonstrate that the GSH-AuNP-based sensor strip can be used in the on-site detection of Cd2+ in real samples such as tap water.



中文翻译:

便携式 Au 纳米颗粒比色传感器条,用于快速现场检测饮用水中的 Cd2+ 离子

使用便携式设备对镉离子 (Cd 2+ ) 进行简单、快速且无需仪器的检测对于防止饮用水污染至关重要。在此,我们提出了一种简单、快速和低成本的方法,用于使用沉积在聚对苯二甲酸乙二醇酯 (PET) 传感带上的谷胱甘肽修饰的 Au 纳米粒子 (GSH-AuNPs)实时/现场检测 Cd 2+。为了制造传感带,制备了由 GSH-AuNPs 和聚乙烯吡咯烷酮组成的涂料。随后,将 GSH-AuNP 涂料沉积在固定在 PET 基材上的模具上,并在环境空气中干燥。沉积在 PET 基材上的 GSH-AuNPs 迅速重新分散在水中,使水变红。然而,在含有 Cd 2+ 的水样中聚集的 GSH-AuNPs,把水变成蓝色。该 Cd 2+感应条的检测限为 18.8 nM,与美国环境保护署规定的饮用水中 44.5 nM Cd 2+的最大污染水平相当。最后,我们证明了基于 GSH-AuNP 的传感带可用于现场检测自来水等实际样品中的 Cd 2+

更新日期:2021-06-18
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