Promising energy transfer system between fuorine and nitrogen Co-doped graphene quantum dots and Rhodamine B for ratiometric and visual detection of doxycycline in food. (15th September 2022)

• Record Type: Journal Article
• Authors: Tang, Siyuan; Chen, Da; Li, Xiameng; Wang, Changxing; Li, Tingting; Ma, Jiaxing; Guo, Guoqiang; Guo, Qinglei
• Is Part Of: Food chemistry. Volume 388(2022)
• Publication Date: 2022-09-15
• Subjects: Dual emissive fluorescence -- Doxycycline detection -- Ratiometric sensor -- Visual quantitation -- Flexible solid-state fluorescent sensing; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2022.132936
• Languages: English
• ISSNs: 0308-8146

Abstract

Graphical abstract: Highlights: We developed a ratiometric optical dual-mode probe by grafting RhB on FNGQDs. The FNGQDs-RhB exhibited dual emission behaviors. A ratiometric fluorescent sensing platform was established. The synergistic effect of IFE and DRET resulted in fluorescence quenching. A rapid and visual sensor of DOX was constructed based on the FNGQDs-RhB/PVA film. Abstract: A novel sensor based on dual emissive fluorescent graphene quantum dots is developed for a rapid, selective, sensitive and visual detection of doxycycline (DOX). The ratiometric fluorescent probe is designed by grafting fluorescent group (Rhodamine B, RhB) on F, N -doped graphene quantum dots (FNGQDs). In the presence of DOX, the fluorescence at 466 nm is remarkably quenched due to inner filter effect and fluorescence resonance energy transfer, whereas the peak at 592 nm is attenuated slightly due to the energy transfer in the emission peaks of FNGQDs and RhB functional group. The sensor shows good linear relationship from 0.04 to 100 µM with a low detection limit of 40 nM. Furthermore, the flexible solid-state fluorescent sensing platform is used for detecting DOX in milk, pork and water samples. Therefore, this dual-emission FGQD-RhB can be used as a high-performance fluorescent and visual sensor for food safety and environmental monitoring.