Controlled Growth of Gold Nanobipyramids Using Thiocholine for Plasmonic Colorimetric Detection of Organophosphorus Pesticides,ACS Applied Nano Materials

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Controlled Growth of Gold Nanobipyramids Using Thiocholine for Plasmonic Colorimetric Detection of Organophosphorus Pesticides
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-11-07 , DOI: 10.1021/acsanm.2c03902
Daowei Liang _{1,

2,

3} , Yiwen Wang _{1,

2,

3} , Lanrui Ma _{1,

2,

3} , Yanlin Liu _{1,

2,

3} , Ruijie Fu _{1,

2,

3} , Haoran Liu _{1,

2,

3} , Yilin Peng _{1,

2,

3} , Yaohai Zhang _{1,

2,

3} , Chengqiu Wang _{1,

2,

3} , Bining Jiao _{1,

2,

3} , Yue He _{1,

2,

3}

Affiliation

Implementing suitable additives as morphology control agents to tune the shape of gold nanocrystals is a great challenge, as it requires the production of additives in a controlled manner and subsequent rational design of its applications. Herein, thiocholine-controllable regulation of the shape of gold nanobipyramids (AuNBPs) is proposed for the first time. Subsequently, it is used for constructing a plasmonic colorimetric sensor for the detection of organophosphorus pesticides (OPs). The principle of the platform is that first, highly uniform AuNBPs are prepared in situ by a seed-mediated growth method. Then, the thiocholine produced from the hydrolysis of acetylthiocholine by acetylcholinesterase (AChE) can be selectively adsorbed on the surface of the gold seeds, preventing the gold seeds from forming AuNBPs. Transmission electron microscopy shows the evolution of the shape of AuNBPs from bipyramid to cube and finally irregular sphere as the concentration of thiocholine increases. Therefore, the AChE concentration is highly correlated with the shape of the grown gold nanoparticles. Consequently, a plasmonic colorimetric method is established for the sensitive detection of OPs with the ability to irreversibly inhibit AChE activity. The proposed method achieves highly sensitive detection of paraoxon and demeton with limit of detections as low as 1.07 and 6.48 ng mL^–1, respectively. Owing to the advantages of simple operation and high sensitivity, this method has great potential in the monitoring of OPs in agricultural products.

中文翻译：

使用硫胆碱控制金纳米双锥的生长用于有机磷农药的等离子体比色检测

实施合适的添加剂作为形态控制剂来调整金纳米晶体的形状是一个巨大的挑战，因为它需要以可控的方式生产添加剂并随后对其应用进行合理设计。在此，首次提出硫胆碱可控调控金纳米双锥体 (AuNBPs) 的形状。随后，它被用于构建用于检测有机磷农药 (OPs) 的等离子体比色传感器。该平台的原理是，首先，通过种子介导的生长方法原位制备高度均匀的 AuNBP。然后，乙酰胆碱酯酶（AChE）水解乙酰硫胆碱产生的硫代胆碱可以选择性地吸附在金种子表面，防止金种子形成AuNBPs。透射电子显微镜显示，随着硫代胆碱浓度的增加，AuNBPs 的形状从双锥体演变为立方体，最后演变为不规则球体。因此，AChE 浓度与生长的金纳米粒子的形状高度相关。因此，建立了一种用于灵敏检测具有不可逆抑制 AChE 活性能力的 OP 的等离子体比色法。所提出的方法实现了对氧磷和内吸磷的高灵敏度检测，检测限低至 1.07 和 6.48 ng·mL 建立了一种等离子体比色法，用于灵敏检测具有不可逆抑制 AChE 活性能力的 OP。所提出的方法实现了对氧磷和内吸磷的高灵敏度检测，检测限低至 1.07 和 6.48 ng·mL 建立了一种等离子体比色法，用于灵敏检测具有不可逆抑制 AChE 活性能力的 OP。所提出的方法实现了对氧磷和内吸磷的高灵敏度检测，检测限低至 1.07 和 6.48 ng·mL^–1分别。该方法具有操作简单、灵敏度高等优点，在农产品中有机磷农药的监测方面具有巨大潜力。

更新日期：2022-11-07

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