Visual detection of glyphosate by Al3+-regulated carbon dots/CdTe quantum dots ratiometric fluorescent sensing platform

IF 8.5 1区农林科学 Q1 CHEMISTRY, APPLIED Food Chemistry Pub Date : 2025-01-25 DOI:10.1016/j.foodchem.2025.143070

Ziyi Qin, Jinju Xu, Yuanxin Cao, Chunhui Liao, Tian Lan, Shuyun Shi

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Abstract

Highly sensitive monitoring of pesticides has garnered attention for food safety. Here, a ratiometric fluorescent probe (AG-CDs-Al³⁺/CdTe QDs) was fabricated for specific and sensitive sensing of glyphosate. Surface modifications revealed the chelation-enhanced fluorescence process between the surface -OH of AG-CDs and Al³⁺. Positively charged green-emission AG-CDs-Al³⁺ assembled with negatively charged red-emission CdTe QDs, and photoinduced electron transfer (PET) occurred from CdTe QDs to AG CDs-Al³⁺. Glyphosate specifically coordinated with Al³⁺, causing remarkable variations in F₅₀₀/F₆₃₀ (linear range, 0.2–4.0 μM; detection limit, 5.7 nM) and a distinguishable green-yellow-red color change on the paper platform (linear range, 0.5–8.0 μM; detection limit, 26 nM). Furthermore, for real sample analysis, the sensor has the advantages of fast response (5 min), excellent accuracy (spiked recoveries, 95.0–105.0 %), high precision (relative standard deviation, < 3.33 %), and superior specificity, which endowed the designed sensing platform with great potential practicality in the field of food analysis.

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来源期刊

Food Chemistry 工程技术-食品科技

CiteScore

16.30

自引率

10.20%

发文量

3130

审稿时长

122 days

期刊介绍： Food Chemistry publishes original research papers dealing with the advancement of the chemistry and biochemistry of foods or the analytical methods/ approach used. All papers should focus on the novelty of the research carried out.