一叶扁舟的博客分享 http://blog.sciencenet.cn/u/jinhejiang 崇山峻岭中的一滴露珠

博文

云师大能环学院徐锐、张勇教授在《Analytica Chimica Acta》发表最新研究成果

已有 583 次阅读 2024-5-8 12:59 |个人分类:云师大研究|系统分类:论文交流

    2024年5月7日,Elsevier 旗下top期刊《Analytica Chimica Acta》在线发表了云南师范大学能源与环境科学学院徐锐教授课题组最新研究成果《Multiple signal-enhanced electrochemiluminescence aptamer sensors based on carboxylated ruthenium (II) complexes for acetamiprid detection》。云南师范大学能源与环境科学学院徐锐教授和张勇教授为通讯作者。

https://www.sciencedirect.com/science/article/pii/S0003267024004781

1-s2.0-S0003267024004781-ga1_lrg.jpgAbstractBackground

Rapid and sensitive detection for acetamiprid, a kind of widely used neonicotinoid insecticide, is very meaningful for the development of modern agriculture and the protection of human health. Highly stable electrochemiluminescence (ECL) materials are one of the key factors in ECL sensing technology. ECL materials prepared by porous materials (e.g., MOFs) coated with chromophores have been used for ECL sensing detection, but these materials have poor stability because the chromophores escape when they are in aqueous solution. Therefore, the development of highly stable ECL materials is of great significance to improve the sensitivity of ECL sensing technology.

Results

In this work, by combining etched metal-organic frameworks (E-UIO-66-NH2) as carrier with Tris(4,4′-dicarboxylic acid-2,2′-bipyridine)Ru(II) chloride (Ru(dcbpy)32+) as signal probe via amide bonds, highly stable nanocomposites (E-UIO-66-NH2-Ru) with excellent ECL performance were firstly prepared. Then, using MoS2 loaded with AuNPs as substrate material and co-reactant promoter, a signal off-on-off ECL aptamer sensor was prepared for sensitive detection of acetamiprid. Due to the excellent catalytic activity of E-UIO-66-NH2-Ru and MoS2@Au towards K2S2O8, the ECL signals can be enhanced by multiple signal enhancement pathways, the prepared ECL aptamer sensor could achieve sensitive detection of acetamiprid in the linear range of 10−13 to10−7 mol L−1, with the limit of detection (LOD) of 2.78ⅹ10−15 mol L−1 (S/N = 3). After the evaluation of actual sample testing, this sensing platform was proven to be an effective method for the detection of acetamiprid in food and agricultural products.

Significance and novelty

The E-UIO-66-NH2-Ru prepared by linking Ru(dcbpy)32+ to E-UIO-66-NH2 via amide bonding has very high stability. The synergistic catalytic effect of MoS2 and AuNPs enhanced the ECL signal. By exploring the sensing mechanism and evaluating the actual sample tests, the proposed signal "on-off" ECL sensing strategy was proved to be an effective and excellent ECL sensing method for sensitive and stable detection of acetamiprid.

Graphical abstract

The conventional cathodic ECL response uses K2S2O8 as co-reactant. Generally, K2S2O8 can only be activated by participating in redox reactions on the electrode surface, and then the reactive intermediate SO4•− is produced to participate in the subsequent luminescence process (Route 1). However, since the amount of the active intermediate SO4•− limits the luminescence efficiency of the luminophore, increasing the production rate of the active intermediate SO4•− is an effective way to improve the efficiency of ECL. In this study we used MOFs material (E-UIO-66-NH2) etched by thermal treatment as the carrier of the luminophore Ru(dcbpy)32+, and the etched E-UIO-66-NH2 exposed more amino groups, which can effectively catalyze the activation process of K2S2O8 and produce more SO4•− (Route 4). Not only that, the Mo4+/Mo6+ active sites produced by 3D MoS2 nanoflowers involved in the redox reaction on the electrode surface can also effectively catalyze the activation process of K2S2O8 (Route 2). AuNPs grown in situ on the MoS2 surface can also effectively catalyze the activation process of K2S2O8 (Route 3). Therefore, we constructed a sandwich-type ECL sensor based on multiple signal enhancement strategy to achieve efficient and sensitive detection of acetamiprid in the range of 10−13 to 10−7 mol L−1 with a detection limit of 2.78ⅹ10−15 mol L−1. This provides an effective method for the sensitive detection of acetamiprid in food and agricultural products.

微信截图_20240508125703.png

扩展阅读:

云师大能环学院徐锐课题组在top期刊《分离纯化技术》期刊发表最新研究成果

云师大能环学院徐锐课题组在生物技术科学top期刊《Bioresource Technology》发表最新研究成果

云师大能环学院张勇课题组在国际top期刊《Analytical Chemistry 》上发表最新研究成果

云师大能环学院张勇课题组在国际top期刊《Sensors and Actuators B: Chemical》发表

张勇教授入职云南师范大学



https://blog.sciencenet.cn/blog-454141-1433165.html

上一篇:云师大化工学院李如春在《Separation and Purification Technology》发表最新研究成果
下一篇:路过牛栏江
收藏 IP: 221.213.54.*| 热度|

2 杨正瓴 郑永军

该博文允许注册用户评论 请点击登录 评论 (0 个评论)

数据加载中...

Archiver|手机版|科学网 ( 京ICP备07017567号-12 )

GMT+8, 2024-6-12 22:17

Powered by ScienceNet.cn

Copyright © 2007- 中国科学报社

返回顶部