Synthesis of water-soluble CuInS2@ZnS quantum dots using amino acids as ligands and their application in smartphone-based visual detection of ciprofloxacin

IF 2.8 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Research on Chemical Intermediates Pub Date : 2024-09-01 DOI:10.1007/s11164-024-05385-4
Huiwen Wang, Hualan Zhou, Yue Wang, Yiqing Yang, Wenjie Cong, Mingxuan Wang, Jianguo Zhang
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Abstract

Ternary I-III-VI quantum dots, unlike traditional binary counterparts, offer advantages like low toxicity, cadmium-free composition, tunable electronic properties, and near-infrared light emission, making them increasingly popular for their cost-effectiveness and versatile applications in light emission. In this study, monodispersive, water-soluble, highly emissive CuInS2@ZnS quantum dots were synthesized using cysteine and threonine as ligands by a simple one-pot solution method. By adjusting, the ratio of cysteine to threonine to 1:5 and the heating time during the synthesis process to 40 min, CuInS2@ZnS quantum dots achieved the highest fluorescence intensity. Then, CuInS2@ZnS quantum dots were applied for ciprofloxacin (CIP) detection in food sample, showing a linear range of 2–18 μg/ml and a lowest detection limit of 0.28 μg/ml. The fluorescent probe was successfully established by quenching process as CIP concentration increasing, due to photoinduced electron transfer. Experimental results demonstrated the detection method has high sensitivity and good selectivity. We, then utilized smartphones to visually distinguish CIP concentrations based on the colors emitted by the CuInS2@ZnS quantum dots under UV light. The method was finally effectively to detect residual CIP in porcine kidneys, with recoveries of 92%–98%. This approach has promising potential for enhancing food safety testing.

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以氨基酸为配体合成水溶性 CuInS2@ZnS 量子点及其在基于智能手机的环丙沙星视觉检测中的应用
与传统的二元量子点不同,三元 I-III-VI 量子点具有低毒性、无镉成分、可调电子特性和近红外光发射等优点,因其成本效益高和在光发射领域的广泛应用而越来越受欢迎。本研究以半胱氨酸和苏氨酸为配体,采用简单的一锅溶液法合成了单分散、水溶性、高发射的 CuInS2@ZnS 量子点。通过调节半胱氨酸和苏氨酸的比例为 1:5,以及合成过程中的加热时间为 40 分钟,CuInS2@ZnS 量子点获得了最高的荧光强度。然后,将 CuInS2@ZnS 量子点应用于食品样品中环丙沙星(CIP)的检测,其线性范围为 2-18 μg/ml,最低检测限为 0.28 μg/ml。随着 CIP 浓度的增加,光诱导电子转移导致的淬灭过程成功地建立了荧光探针。实验结果表明,该检测方法具有高灵敏度和良好的选择性。随后,我们利用智能手机,根据 CuInS2@ZnS 量子点在紫外光下发出的颜色来直观区分 CIP 的浓度。该方法最终有效地检测了猪肾中残留的 CIP,回收率高达 92%-98%。这种方法在加强食品安全检测方面具有广阔的前景。
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来源期刊
CiteScore
5.70
自引率
18.20%
发文量
229
审稿时长
2.6 months
期刊介绍: Research on Chemical Intermediates publishes current research articles and concise dynamic reviews on the properties, structures and reactivities of intermediate species in all the various domains of chemistry. The journal also contains articles in related disciplines such as spectroscopy, molecular biology and biochemistry, atmospheric and environmental sciences, catalysis, photochemistry and photophysics. In addition, special issues dedicated to specific topics in the field are regularly published.
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