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Mediated self-assembled gold nanoclusters with mesoporous silica particles to boost fluorescence for enhanced on-site monitoring of organophosphate pesticides

Accurate detection of organophosphate pesticides (OPs) is paramount for ensuring food safety. Dendritic mesoporous silica sphere was employed to confine gold nanoclusters (AuNCs@dmSiO2) to ameliorate fluorescent property of AuNCs. A AuNCs@dmSiO2-based fluorescent method was developed for OPs sensing...

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Bibliographic Details
Published in:Food chemistry 2025-01, Vol.463 (Pt 1), p.141120, Article 141120
Main Authors: Wang, Shun, Han, Yaqing, Su, Mengdi, Wang, Hao, Chen, Yuze, Huang, Baoling, Bai, Qian, Wang, Mengke
Format: Article
Language:English
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Summary:Accurate detection of organophosphate pesticides (OPs) is paramount for ensuring food safety. Dendritic mesoporous silica sphere was employed to confine gold nanoclusters (AuNCs@dmSiO2) to ameliorate fluorescent property of AuNCs. A AuNCs@dmSiO2-based fluorescent method was developed for OPs sensing. Identification of Cu2+ by AuNCs quenched AuNCs@dmSiO2 fluorescence. Interaction between Cu2+ and generated thiocholine in catalysis of acetylcholinesterase (AChE) caused fluorescence enhancement. OPs, an inhibitor of AChE, suppressed thiocholine production to cause fluorescence quenching. Based on fluorescent variation, a fluorescent method was proposed for OPs by selecting paraoxon as a model within range of 0.05–25.0 ng/mL with a limit of detection (LOD) of 0.032 ng/mL. Besides, a portable test swab was prepared for on-site monitoring OP paraoxon with a smartphone-based 3D-printing portable device with a LOD of 0.65 ng/mL. This work is highlighted by the inspiration of designing highly fluorescent AuNCs, and the provision of a viable avenue for OPs-related food analysis. [Display omitted] •The AuNCs@dmSiO2 with excellent fluorescence property was strategically synthesized.•A portable sensor was fabricated for on-site monitoring of OPs (paraoxon).•The AuNCs@dmSiO2 displayed ultra-sensitive and specific performances for OPs.•This study offers an effective avenue for OPs related food safety supervision.
ISSN:0308-8146
1873-7072
1873-7072
DOI:10.1016/j.foodchem.2024.141120