敌敌畏
光热治疗
检出限
化学
催化作用
选择性
电子转移
纳米技术
光化学
材料科学
色谱法
有机化学
农学
生物
杀虫剂
作者
Yangyu Yang,Jinju Xu,Rongrong Zhou,Ziyi Qin,Chunhui Liao,Shuyun Shi,Yuxia Chen,Ying Guo,Shuihan Zhang
出处
期刊:Carbon
[Elsevier]
日期:2024-02-01
卷期号:219: 118831-118831
标识
DOI:10.1016/j.carbon.2024.118831
摘要
Nanozyme-based assays present favorable prospects in sensitive determination of pesticides in food samples yet are constrained with little or even no catalytic activities at neutral pH, lack of selectivity, and interference by sample color. Here, a facile and novel photothermal system for rapid, specific, sensitive, and background-free detection of dichlorvos was developed based on peroxidase-like activity of coordinated carbon dots-Fe (CDs-Fe). CDs-Fe was prepared and fabricated based on the redox and coordination chemistry between CDs and Fe species. Catalytic mechanism investigations illustrate that CDs-Fe with outstanding peroxidase-like activity at neutral pH comes from the synergistic effect of •OH production and electron transfer process. More interestingly, dichlorvos can specifically complex with CDs-Fe through electrostatic attraction and π-π stacking interactions, which then cement substrates affinity and improve electron transfer efficiency to enhance the catalytic activity. Oxidized 3,3′,5,5′-tetramethylbenzidine (oxTMB) presents photothermal effect by absorption of near-infrared (808 nm) laser-driven light, which eliminates the color interference from real samples. Accordingly, a background-free photothermal strategy was established. Furthermore, a portable hydrogel kit was fabricated by embedding CDs-Fe and TMB into agarose hydrogel for on-site rapid detection of dichlorvos. A good relationship was observed in the range of 5.00–650 μg L−1 with a satisfactory detection limit at 4.85 μg L−1, and a good recovery (90.56–107.0 %) with excellent anti-interference capacity was achieved for real sample analysis. The work presents a novel nanozyme enhancement strategy for specific and background-free detecting dichlorvos in food samples.
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