Amine-functionalized sulfur quantum dots (NH2-SQDs) for detection of tetracycline in food samples

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-04-18 DOI:10.1016/j.materresbull.2025.113506

Jothi Vinoth Kumar , Jong-Whan Rhim

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Abstract

Amine-functionalized sulfur quantum dots (NH₂-SQDs) are introduced as a novel and highly efficient fluorescent probe for detecting tetracycline (TC) in food and environmental samples. Unlike traditional carbon quantum dots, NH₂-SQDs exhibit excellent photoluminescence stability, a high quantum yield of 59.5 %, and enhanced selectivity. Synthesized through an ethylenediamine-assisted hydrothermal method, these NH₂-SQDs attain an ultra-low detection limit of 0.003 μmol/L by utilizing fluorescence quenching mechanisms, including hydrogen bonding, electrostatic interaction, and the inner filter effect. This method surpasses conventional fluorescence-based tetracycline sensors by providing greater sensitivity, strong anti-interference capability, and a quick response time. Validation with real samples, such as milk, honey, and water, showed high recovery rates ranging from 94.7 % to 100.5 % with minimal standard deviation, reinforcing the reliability of the results. These findings suggest that NH₂-SQDs can serve as a cost-effective and robust alternative for real-time monitoring of antibiotic residues, thereby improving food safety and environmental outcomes protection.

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胺功能化硫量子点（NH2-SQDs）检测食品样品中四环素

胺功能化硫量子点（NH₂-SQDs）是一种新型高效荧光探针，可用于检测食品和环境样品中的四环素（TC）。与传统的碳量子点不同，NH₂-SQDs 具有出色的光致发光稳定性、59.5% 的高量子产率和更高的选择性。这些 NH₂-SQDs 通过乙二胺辅助水热法合成，利用氢键、静电作用和内滤光器效应等荧光淬灭机制，实现了 0.003 μmol/L 的超低检测限。该方法超越了传统的基于荧光的四环素传感器，灵敏度更高、抗干扰能力更强、响应时间更快。使用牛奶、蜂蜜和水等真实样品进行的验证表明，该方法的回收率高达 94.7% 至 100.5%，且标准偏差极小，从而增强了结果的可靠性。这些研究结果表明，NH₂-SQDs 可以作为实时监测抗生素残留的一种经济、可靠的替代方法，从而改善食品安全和环境成果保护。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.