Yang Dou, Shao Tong, Zhang Likai, Wang Xiaoshuang, Yue Qiaoli
School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.
School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.
Food Chem. 2025 Apr 30;472:142905. doi: 10.1016/j.foodchem.2025.142905. Epub 2025 Jan 17.
Carbon dots (CDs), one type of zero-dimensional carbon nanomaterial, showed extensive application in food analysis. Herein, CDs as fluorometry and colorimetry probes were developed to determine peroxydisulfate (PDS) and phosphate ion (Pi) in food samples. CDs were developed with one-pot hydrothermal process from 5-amino salicylic acid and o/m-phenylenediamine named o/m-CDs. o-CDs and m-CDs showed bright green fluorescence with quantum yield at 5.73 % and 6.40 %, which was quenched by PDS and Pi. Fluorometry was based on fluorescence quenching with LOD at 1.6 nM (PDS) and 5.2 nM (Pi). The colorimetry was based on color change of CDs from colorless to brown and indigo blue with LOD at 2.4 (PDS) and 21.1 μM (Pi). Interestingly, for both channels there was no interfering of each other. For portable detection, a wechat mini program of smart phone was employed to calculate the color change. Furthermore, the systems were potential for application in food safety analysis.
碳点（CDs）作为一种零维碳纳米材料，在食品分析中有着广泛的应用。在此，开发了用作荧光测定法和比色法探针的碳点，以测定食品样品中的过二硫酸盐（PDS）和磷酸根离子（Pi）。通过5-氨基水杨酸和邻/间苯二胺采用一锅水热法制备了碳点，命名为邻/间碳点。邻碳点和间碳点呈现亮绿色荧光，量子产率分别为5.73%和6.40%，它们会被PDS和Pi淬灭。荧光测定法基于荧光淬灭，对PDS的检测限为1.6 nM，对Pi的检测限为5.2 nM。比色法基于碳点从无色变为棕色和靛蓝色的颜色变化，对PDS的检测限为2.4，对Pi的检测限为21.1 μM。有趣的是，在这两种检测方法中，彼此之间不存在干扰。对于便携式检测，利用智能手机的微信小程序来计算颜色变化。此外，该系统在食品安全分析中具有应用潜力。
