Detection of oxytetracycline residues in milk based on the fluorescence quenching effect of AgInS2/ZnS quantum dots

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2026-06-01 Epub Date: 2026-01-31 DOI:10.1016/j.optmat.2026.117927

Jie Chen, Lijiao Sun, Xiaoyun Pu, Kezhen Qi, Ya Yan

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引用次数: 0

Abstract

Water-dispersed ZnS-coated AgInS₂ quantum dots (AIS/ZnS QDs) were synthesized via a one-pot aqueous method, and their crystal structure, surface composition, morphology and optical properties were systematically characterized. Based on the fluorescence quenching effect of AIS/ZnS QDs toward oxytetracycline (OTC), a fluorescence spectrophotometric method was established for OTC detection in milk. Under optimal conditions (QDs preparation at pH 5.5, detection temperature of 20 °C, and detection concentration of 0.160 g/L, with a 25 min reaction time), the relative fluorescence quenching degree (ΔF/F₀) showed a good linear correlation with logC (OTC concentration), with a linear equation of ΔF/F₀ = 0.2933 logC + 2.3388 (R² = 0.9984), a linear range of 1.22 × 10⁻⁸ to 2.5 × 10⁻⁵ mol/L and a detection limit of 1.82 × 10⁻⁹ mol/L. The spiked recoveries of OTC in milk were 96.9%–107.1%. Furthermore, the possible quenching mechanism was proposed. This work offers insights into AIS-based functional material synthesis and expands their applications in fluorescence analysis.

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基于AgInS2/ZnS量子点荧光猝灭效应的牛奶中土霉素残留检测

采用一锅水法制备了水分散ZnS包覆AgInS2量子点（AIS/ZnS QDs），并对其晶体结构、表面组成、形貌和光学性质进行了系统表征。利用AIS/ZnS量子点对土霉素（OTC）的荧光猝灭作用，建立了牛奶中土霉素（OTC）的荧光分光光度检测方法。量子点在最优条件下(准备在pH值为5.5,检测温度20 °C,和检测浓度为0.160 g / L, 25分钟的反应时间),相对荧光猝灭程度(ΔF / F0)呈良好的线性相关与logC浓度(OTC)的线性方程ΔF / F0 logC = 0.2933 + 2.3388 (R2 = 0.9984),线性范围1.22 × 10−8到2.5 × 10−5 mol / L和1.82的检出限 × 10−9 mol / L。牛奶中OTC的加标回收率为96.9% ~ 107.1%。并提出了可能的淬火机理。这项工作为基于ais的功能材料合成提供了见解，并扩展了它们在荧光分析中的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.