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Functionalized Gold Nanoparticles for Visual Determination of Dopamine in Biological Fluids
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-05-11 , DOI: 10.1021/acsanm.2c01294
Xigui Liu 1, 2 , Danlian Huang 2 , Cui Lai 2 , Yashi Chen 2 , Xuerong Zhou 2 , Fuhang Xu 2
Affiliation  

A facile, low-cost, and reliable visual method, based on 6-thioguanine (6-TG) functionalized gold nanoparticles (AuNPs), is introduced for highly sensitive and selective determination of dopamine. In this method, the hydrogen-bonding identification between 6-TG and dopamine can induce the collection of the functionalized AuNPs, causing the color of AuNPs to change from wine red to blue. Therefore, the presence of dopamine can be identified with bare eyes. Moreover, the concentration of dopamine can be quantitatively detected by a UV–vis spectrophotometer. Experiments reveal that in the range from 0.01 to 4 μM, the ratio of the peak at 650 and 520 nm (A650/A520) is linearly proportional to the dopamine concentration, with a lower limit of detection (LOD) of 4.6 nM (S/N = 3). In addition, the selective experiment reveals that the developed method shows high specificity. Meanwhile, this method can be used for the determination of trace levels of dopamine in practical samples, and it reveals a satisfied result. In conclusion, the proposed method is simple and convenient without any tedious treatment processes and sophisticated instruments. Furthermore, the designed method would provide a detection pathway for other organic interring species and make a valuable contribution to improve the visual method.

中文翻译:

用于目测生物体液中多巴胺的功能化金纳米粒子

介绍了一种基于 6-硫鸟嘌呤 (6-TG) 功能化金纳米粒子 (AuNPs) 的简便、低成本且可靠的视觉方法,用于高灵敏度和选择性地测定多巴胺。在该方法中,6-TG与多巴胺之间的氢键识别可以诱导功能化AuNPs的聚集,使AuNPs的颜色由酒红色变为蓝色。因此,可以用裸眼识别多巴胺的存在。此外,多巴胺的浓度可以通过紫外-可见分光光度计进行定量检测。实验表明,在 0.01 到 4 μM 范围内,650 和 520 nm 处的峰比 ( A 650 / A 520) 与多巴胺浓度成线性比例,检测下限 (LOD) 为 4.6 nM (S/N = 3)。此外,选择性实验表明所开发的方法具有很高的特异性。同时,该方法可用于实际样品中痕量多巴胺的测定,结果令人满意。总之,所提出的方法简单方便,没有任何繁琐的处理过程和复杂的仪器。此外,所设计的方法将为其他有机嵌入物种提供检测途径,并为改进视觉方法做出有价值的贡献。
更新日期:2022-05-11
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