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.
摘要：
本文揭示了使用基于聚集诱导发射（AIE）的荧光金纳米簇（AuNC）检测柠檬酸（CA）的新策略。以谷胱甘肽（GSH）为模板和还原剂合成AuNCs，并作为荧光探针在铝离子（Al3）介导下检测CA。随着Al3+的加入,AuNCs的荧光强度增加了约4倍,但添加CA后增强的荧光被猝灭。基于这种荧光现象,设计了“开-关”荧光策略来灵敏测定CA，CA的线性检测范围在0-80.0μM内。此外,该探针对CA的测定具有较高的选择性和准确性。详细探讨了AuNCs的荧光增强和猝灭机理。所建立的探针已成功用于饮料中CA的检测。从97.50％到103.67％的峰值回收率令人满意，这表明该探针具有检测食品中CA的潜在前景。
