A turn-on fluorescence sensor based on Cu2+ modulated DNA-templated silver nanoclusters for glyphosate detection and mechanism investigation
文献类型： 外文期刊
作者： Yang, Yixia 1 ; Ghalandari, Behafarid 1 ; Lin, Liyun 2 ; Sang, Xiao 1 ; Su, Wenqiong 1 ; Divsalar, Adeleh 3 ; Ding, Xianting 1 ;
作者机构： 1.Shanghai Jiao Tong Univ, Sch Biomed Engn, Inst Personalized Med, State Key Lab Oncogenes & Related Genes, Shanghai 200030, Peoples R China
2.Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Zhanjiang 524001, Guangdong, Peoples R China
3.Kharazmi Univ, Fac Biol Sci, Dept Cell & Mol Sci, Tehran, Iran
关键词： Fluorescence sensor; DNA-AgNCs; Organophosphorus pesticide; Mechanism investigation; Stoichiometric methods
期刊名称：FOOD CHEMISTRY （ 影响因子：9.231； 五年影响因子：8.795 ）
ISSN： 0308-8146
年卷期： 2022 年 367 卷
页码：
收录情况： SCI
摘要： The abuse application of glyphosate can result in a potential hazard for environment and human, however its ultrasensitive detection remains challenging. Herein, a Cu2+ modulated DNA-templated silver nanoclusters (DNA-AgNCs) sensor was constructed to sensitively determine glyphosate based on the turn-on fluorescence strategy. The fluorescence quenching of DNA-AgNCs occurred with the existence of Cu2+. Upon the presence of glyphosate, the functional groups on the surface of glyphosate could chelate with Cu2+, following the fluorescence recovery of DNA-AgNCs. Through the stoichiometric methods, we unveil that Cu2+-trigged fluorescence quenching mode is a combination of static and dynamic quenching with the static mode being predominant. In DNA-AgNCs/Cu2+ system, the carboxylate, amine, and phosphonate groups of glyphosate interact with Cu2+ through chelation, in which the carboxylate oxygen, the phosphonate oxygen atoms, and the monoprotonated secondary amine nitrogen atom and Cu2+ form chelate rings. This fluorescence sensor showed a desired linearity of glyphosate analysis under the optimum conditions, ranging from 15 to 100 mu g/L with a low detection down to 5 mu g/L. Moreover, the proposed sensor was successfully utilized to measure glyphosate in real samples, indicating a promising application in pesticide residues detection.
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