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Electrochemiluminescence immunosensor for thiamethoxam detection using NiFe-LDH-loaded Cu single-atom catalysts

文献类型： 外文期刊

作者： Chen, Rui 1 ; Pang, Chaohai 1 ; Ma, Xionghui 1 ; Wu, Xuejin 1 ; Liu, Chunhua 1 ; Yin, Guihao 1 ; Zhang, Zhenshan 1 ; Li, Shuhuai 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Anal & Test Ctr,Minist Agr & Rural Affairs, Hainan Prov Key Lab Qual & Safety Trop Fruits & Ve, Key Lab Qual & Safety Control Subtrop Fruits & Veg, Haikou 571101, Peoples R China

2.Guilin Univ Technol, Coll Environm Sci & Engn, Collaborat Innovat Ctr Water Pollut Control & Wate, Guangxi Key Lab Theory & Technol Environm Pollut C, Guilin 541006, Peoples R China

关键词： Electrochemiluminescence sensors; Thiamethoxam; NiFe-layered double hydroxides (LDHs); Cu single atoms; Aptamers

期刊名称：MICROCHIMICA ACTA （ 影响因子：5.3； 五年影响因子：4.9 ）

ISSN： 0026-3672

年卷期： 2025 年 192 卷 9 期

页码：

收录情况： SCI

摘要： An ECL signal amplification strategy is introduced leveraging a multimetallic catalytic amplification effect. Nickel-iron bimetallic oxide compounds were synthesised and loaded with Cu SAs catalysts on their surface to create nickel-iron layered double hydroxides/copper single atoms (NiFe-LDHs/Cu-SAs) with robust catalytic properties. These NiFe-LDHs/Cu-SAs were employed as signal amplification elements to modify gold electrodes. C-dots labelled with thiacloprid DNA aptamers were used as the signal and molecular recognition elements to construct an electrochemiluminescence (ECL) immunosensor. The NiFe-LDHs/Cu-SAs significantly amplified the ECL signal of the C-dots, enhancing the sensitivity of the sensor. Upon capturing thiamethoxam via the aptamer, the ECL signal was effectively quenched, demonstrating the potential of this approach as a highly sensitive method for thiamethoxam detection. The excellent catalytic performance of NiFe-LDHs/Cu-SAs amplified the detection signal over 20-fold, while the aptamer improved the specificity of the sensor for thiamethoxam recognition. The method demonstrates a linear range of 2-6000 x 10-12 mol/L and a detection limit of 6.52 x 10-13 mol/L, with recoveries of 90%-110% for real sample analysis. This study demonstrates a highly sensitive and specific method for thiamethoxam detection, with real-world applicability, while highlighting an innovative multimetallic catalytic strategy that can facilitate advancements in sensor design across various fields.

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