A new fluorescent probe based on metallic deep eutectic solvent for visual detection of nitrite and pH in food and water environment. (1st January 2023)

• Record Type: Journal Article
• Authors: Song, Jianqiang; Liu, Sitong; Zhao, Ning; Zhao, Longshan
• Is Part Of: Food chemistry. Volume 398(2023)
• Publication Date: 2023-01-01
• Subjects: Fe-doped carbon dots -- Metallic deep eutectic solvent -- Nitrite -- pH-dependent -- Indicator; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2022.133935
• Languages: English
• ISSNs: 0308-8146

Abstract

Graphical abstract: Highlights: A novel fluorescence probe assisted by Fe-doped metal deep eutectic solvent was developed to monitor nitrite and pH value. High sensitivity and selectivity to nitrite and has good stability. The method is green and environmentally friendly. With excellent pH sensitivity, it is considered a new promising candidate for pH sensor in water environment. Abstract: Nitrite is a widely used food additive that has been shown to be carcinogenic and can cause health damage when consumed in excess. Therefore, developing a detection method is in demand. Here, we prepared a novel Fe-doped carbon dots (Fe-CDs) using metallic deep eutectic solvent (MDES) which showed high sensitivity and selectivity. Besides, it also showed excellent pH-dependent luminescence characteristics, which proved the feasibility as a pH sensor. Under the optimal conditions, the detection linear of nitrite ranged from 0.2 to 80 µM, and the detection limit was 50 nM. The recovery rate was between 98.8 % and 104.1 % in food and water samples. For pH monitoring, its fluorescence intensity was linearly correlated in the pH range from 2 to 7, accompanying a unique differential solution color change of colorless-yellow-green. Therefore, it can be used as an excellent fluorescent probe for detection of nitrite and pH in food and water environment.