A novel fluorescence sensor based on Al3+-mediated aggregation of gold nanoclusters for determination of citric acid in beverages

IF 1.8 4区化学 Q3 CHEMISTRY, ANALYTICAL Analytical Sciences Pub Date : 2024-05-08 DOI:10.1007/s44211-024-00587-7

Shengda Qi, Huiru Zheng, Yunbo Niu, Honglin Zhai

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Abstract

This paper revealed a new strategy for citric acid (CA) detection using aggregation-induced emission (AIE)-based fluorescent gold nanoclusters (AuNCs). AuNCs was synthesized using glutathione (GSH) as the template and reducing agent and used as the fluorescent probe to detect CA under aluminum ion (Al³⁺) mediation. The fluorescence intensity of AuNCs increased about 4 times with the addition of Al³⁺, but the enhanced fluorescence was quenched after the addition of CA. Based on this fluorescence phenomenon, an “on–off” fluorescence strategy was designed for the sensitive determination of CA and a linear detection range for CA was achieved within 0–80.0 μM. In addition, the developed probe exhibited high selectivity and accuracy for determination of CA. The mechanism of fluorescence enhancement and quenching of AuNCs was explored in detail. The established probe was used successfully for CA detection in beverages. The spiked recoveries from 97.50% to 103.67% were gratifying, which indicated the probe had potential prospects for detecting CA in food.

Graphical abstract

Schematic diagram of the preparation of AuNCs and the mechanism for the detection of CA

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基于 Al3+ 介导的金纳米团簇聚集的新型荧光传感器，用于测定饮料中的柠檬酸。

本文揭示了一种利用基于聚集诱导发射（AIE）的荧光金纳米团簇（AuNCs）检测柠檬酸（CA）的新策略。AuNCs以谷胱甘肽（GSH）为模板和还原剂合成，并在铝离子（Al3+）介导下用作检测柠檬酸的荧光探针。加入 Al3+ 后，AuNCs 的荧光强度增加了约 4 倍，但加入 CA 后，增强的荧光被淬灭。基于这种荧光现象，我们设计了一种 "开关 "荧光策略来灵敏测定 CA，并在 0-80.0 μM 范围内实现了对 CA 的线性检测。此外，所开发的探针还具有高选择性和高准确度。研究人员详细探讨了 AuNCs 的荧光增强和淬灭机制。所开发的探针被成功用于饮料中 CA 的检测。加标回收率从 97.50% 到 103.67% 令人满意，这表明该探针具有检测食品中 CA 的潜在前景。

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

Analytical Sciences 化学-分析化学

CiteScore

2.90

自引率

18.80%

发文量

232

审稿时长

1 months

期刊介绍： Analytical Sciences is an international journal published monthly by The Japan Society for Analytical Chemistry. The journal publishes papers on all aspects of the theory and practice of analytical sciences, including fundamental and applied, inorganic and organic, wet chemical and instrumental methods. This publication is supported in part by the Grant-in-Aid for Publication of Scientific Research Result of the Japanese Ministry of Education, Culture, Sports, Science and Technology.