MOF@Au NPs/aptamer fluorescent probe for the selective and sensitive detection of thiamethoxam
文献类型： 外文期刊
作者： Yuan, Weiwei 1 ; Li, Shuhuai 3 ; Ma, Xionghui 3 ; Pang, Chaohai 3 ; Wu, Yuwei 3 ; Wang, Mingyue 1 ; Li, Bei 4 ;
作者机构： 1.Huazhong Agr Univ, Coll Food Sci & Technol, Wuhan 430070, Peoples R China
2.Huazhong Agr Univ, Key Lab Environm Correlat Dietol, MOE, Wuhan 430070, Peoples R China
3.Chinese Acad Trop Agr Sci, Anal & Test Ctr, Hainan Prov Key Lab Qual & Safety Trop Fruits & Ve, Minist Agr & Rural Affairs,Key Lab Qual & Safety C, Haikou 571101, Peoples R China
4.Hainan Inst Food Control, Key Lab Trop Fruits & Vegetables Qual & Safety Sta, Haikou 570314, Peoples R China
关键词： Au NPs; DNA aptamer; high sensitivity; metal-organic framework; thiamethoxam
期刊名称：LUMINESCENCE （ 影响因子：2.9； 五年影响因子：2.3 ）
ISSN： 1522-7235
年卷期： 2024 年 39 卷 2 期
页码：
收录情况： SCI
摘要： The luminescence performance of fluorescent reagents plays a crucial role in fluorescence analysis. Therefore, in this study, a novel bi-ligand Zn-based metal-organic framework, Au nanoparticle (NP) fluorescent material was synthesized using a hydrothermal method with Zn as the metal source. Simultaneously, a DNA aptamer was introduced as a molecular recognition element to develop a Zn-based MOF@Au NPs/DNA aptamer fluorescent probe for the ultra-trace detection of thiamethoxam residues in agricultural products. The probe captured different concentrations of the target molecule, thiamethoxam, through the DNA aptamer, causing a conformational change in the DNA aptamer and bursting the fluorescence of the probe, therefore establishing a fluorometric method for thiamethoxam detection. This method is highly sensitive due to the excellent luminescence properties of the Zn-based MOF@Au NPs, and the DNA aptamer can specifically recognize thiamethoxam, offering high selectivity. The linear range of the method was 2.5-6000 x 10-11 mol L-1, with a detection limit of 8.33 x 10-12 mol L-1. This method was applied to the determination of actual samples, such as bananas, and the spiked recovery rate was found to be in the range 84.05-109.07%. Overall, the proposed probe has high sensitivity, high selectivity, and easy operation for the detection of thiamethoxam residues in actual samples. A MOFs@Au NP combined with DNA aptamers fluorescent probe for the detection of thiamethoxam was fabricated. After capturing the target thiamethoxam using the DNA aptamer, the fluorescence intensity of the probe was quenched. The probe exhibits high sensitivity due to the strong and stable fluorescence intensity of Zn-MOF@Au NPs, and the DNA aptamer can specifically recognize thiamethoxam.image
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