A paper-based ratiometric fluorescent sensor for NH3 detection in gaseous phase: Real-time monitoring of chilled chicken freshness

• Published in: Food Chemistry: X Vol. 21; p. 101054
• Main Authors: Xiaowei, Huang, Wanying, Zhao, Wei, Sun, Zhihua, Li, Ning, Zhang, Jiyong, Shi, Yang, Zhang, Xinai, Zhang, Tingting, Shen, Xiaobo, Zou
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 30.03.2024; Elsevier
• Subjects: Ammonia; Chilled Chicken Freshness; Paper-based sensors; Ratio fluorescence; Visual analysis; Ammonia; Chilled Chicken Freshness; Ratio fluorescence; Paper-based sensors; Visual analysis
• ISSN: 2590-1575; 2590-1575
• DOI: 10.1016/j.fochx.2023.101054

•A ratio fluorescent probe with high sensitivity and selectivity.•A portable paper-based sensor is prepared to detect NH3.•The LOD value of the sensor for NH3 in gaseous phase is 288 nM.•This sensor can monitor chicken freshness online. A ratiometric fluorescence sensor platform with easy-to-use and accurate is nanoengineered for NH3 quantitative detection and visual real-time monitoring of chicken freshness using smartphones. The ratiometric fluorescent probe formed by combining the zinc ion complex and carbon dots has a double-emitted fluorescence peak. The fluorescence intensity of the complex changed can be clearly observed with the increase of the concentration of ammonia solution under 365 nm wavelength excitation. In order to detect NH3 concentration in gaseous phase, a portable paper-based sensor was designed. The sensor had a good linear relationship with NH3 concentration ranging from 10.0 to 90.0 μmol/L and the LOD value was 288 nM. This fluorescent paper-based sensor was used to check the freshness of chicken breast refrigerated at 4 °C, revealed observable shifts from blue to green. The fluorescent paper-based sensor can detect NH3 concentration in real time and simplify the monitoring process of meat freshness while ensuring accuracy and stability.