Citation: ZHAO Dan, LI Juan, MA Xiao, WANG Fang, YANG Ren-Wei, LI Jie, SUN Jian. Fluorescence Detection of Glyphosate Based on Copper Ion-mediated Au/Ag Bimetallic Nanoclusters[J]. Chinese Journal of Analytical Chemistry, ;2023, 51(4): 521-530. doi: 10.19756/j.issn.0253-3820.221591 shu

Fluorescence Detection of Glyphosate Based on Copper Ion-mediated Au/Ag Bimetallic Nanoclusters

ZHAO Dan ¹ ,
LI Juan ^1,, ,
MA Xiao ¹ ,
WANG Fang ¹ ,
YANG Ren-Wei ¹ ,
LI Jie ¹ ,
SUN Jian ^2,,

1.
Department of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471023, China;
2.
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: LI Juan, SUN Jian,
Received Date: 1 December 2022
Revised Date: 17 January 2023

Fund Project: Supported by the National Natural Science Foundation of China (No. 22104046), the Program for Innovative Research Team (in Science and Technology) in University of Henan Province (No. 23IRTSTHN009), the Project of Science and Technology Department of Henan Province (Nos. 212102210122, 222102320224), the Education Key Project of Henan Provincial Department (No. 23A150056) and the Development Project of Science and Technology of Jilin Province, China (No. 20200201091JG).

By taking advantage of the competitive reaction between Cu²⁺, Au/Ag bimetallic nanoclusters capped with 11-mercaptoundecanoic acid (AuAgNCs@11-MUA) and glyphosate, a simple and sensitive " turn-on" fluorescence method was devised for glyphosate detection. The fluorescence of AuAgNCs@11-MUA could be selectively quenched by Cu²⁺ owing to the binding between Cu²⁺ and carboxyl groups of AuAgNCs@11-MUA. Due to the specific interaction between Cu²⁺ and functional groups of glyphosate, the pre-incubation of Cu²⁺ and glyphosate could disturb the combination of Cu²⁺ and AuAgNCs@11-MUA and AuAgNCs@11-MUA emitted intense fluorescence again, and thus glyphosate could be quantitatively detected. The optimum pH was 7.0 and the incubation time of Cu²⁺ and glyphosate was 2 min. Under the optimized conditions, the developed method showed a good linear relationship for detection of glyphosate in the concentration range of 0.025-1.0 μg/mL, with an inspiring detection limit as low as 8 ng/mL. In addition, an " Implication" logic gate was rationally devised by employing Cu²⁺ and glyphosate as inputs. Such unprecedented " turn-on" analytical proposal possessed many advantages such as fast response time, high selectivity and sensitivity. The AuAgNCs@11-MUA-Cu²⁺ system could be used for detection of glyphosate in actual water samples with satisfactory results.
- Au/Ag bimetallic nanoclusters,
- Copper ion,
- Glyphosate,
- Fluorescence,
- Molecular logic gate
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