Monitoring organophosphorus pesticides is significant for food safety assessment. Herein, we developed upconversion nanoparticles (UCNPs)-based self-ratiometric fluorescent platform for the detection of chlorpyrifos. The UCNPs have the ability to confine the detection and reference functions in one nanoparticle. Specifically, the blue upconversion (UC) emission (448 nm) in the shell layer of UCNPs is quenched by the product of the acetylcholinesterase-mediated reaction, while the red UC emission (652 nm) from the core remains constant as a self-calibrated reference signal. Employing the inhibition property of chlorpyrifos, self-proportional fluorescence is employed to detect chlorpyrifos. As proof-of-concept, test strips are fabricated by loading the UCNPs onto filter paper. Combined with the smartphone and image-processing algorithm, chlorpyrifos quantitative testing is achieved with a detection limit of 14.4843 ng mL. This portable platform displays anti-interference capability and high stability in the complicated matrix, making it an effective candidate for on-site application.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.foodchem.2023.138100 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A ratiometric fluorescent sensing foil for high resolution 2D pH measurement based on a novel hydroxy-pyrene green fluorophore.
Talanta
March 2025
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China. Electronic address:
The pH of environmental systems plays a crucial role in determining pollutant behavior, necessitating the development of effective tools for real-time monitoring. This study introduces a novel series of lipophilic HPTS derivatives, developed through a two-step synthesis route, designed as pH-sensitive dyes, characterized by high fluorescence intensity, photostability, dual excitation/single emission, and significant Stokes shifts. We engineered self-ratiometric pH-sensing planar optode foils and investigated the impact of carbon chain length on foil durability.
View Article and Find Full Text PDFSelf-ratiometric fluorescence approach based on room-temperature instantaneously synthesized carbon dots from Folin's reagent and ethanolamine for determination of nitroxinil in water, milk, and food samples.
Anal Chim Acta
September 2024
Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, 35516, Mansoura, Egypt; Graduate School of Biomedical Sciences, Course of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, 852-8521, Japan. Electronic address:
Background: Nitroxinil has been used extensively to treat parasitic worms, mainly Fasciola, in food-producing cattle and sheep. The reported methods for nitroxinil analysis included expensive instrumentation, the need for skilled operators, and tedious procedures. Fluorimetry is one of the fastest and simplest methods widely used; hence, we aimed to develop a simple, cost-effective, and convenient fluorometric approach for the estimation of nitroxinil in various matrices.
View Article and Find Full Text PDFMagnetic lanthanide sensor with self-ratiometric time-resolved luminescence for accurate detection of epithelial cancerous exosomes.
J Mater Chem B
July 2024
National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P. R. China.
Fluorescence-based LB (liquid biopsy) offers a rapid means of detecting cancer non-invasively. However, the widespread issue of sample loss during purification steps will diminish the accuracy of detection results. Therefore, in this study, we introduce a magnetic lanthanide sensor (MLS) designed for sensitive detection of the characteristic protein, epithelial cell adhesion molecule (EpCAM), on epithelial tumor exosomes.
View Article and Find Full Text PDFSelf-ratiometric fluorescence approach based on plant extract-assisted synthesized silver nanoparticles for the determination of vanillin.
Mikrochim Acta
December 2023
Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Kafrelsheikh University, P.O. Box 33511, Kafrelsheikh, Egypt.
The current study designed and applied a novel self-ratiometric fluorescent nanosensor composed of green-synthesized silver nanoparticles (Ag-NPs) to determine vanillin in adult and infant foods and human plasma. A straightforward microwave-assisted approach is proposed for synthesizing Ag-NPs in less than 1 min using a reducing agent, tailed pepper seed extract. The synthesized Ag-NPs had a strong fluorescence with an intense emission band at 360 nm and a shoulder peak at 430 nm when excited at 265 nm.
View Article and Find Full Text PDFSelf-ratiometric fluorescent platform based on upconversion nanoparticles for on-site detection of chlorpyrifos.
Food Chem
May 2024
State Key Laboratory on Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors of Jilin Province, College of Electronic Science & Engineering, Jilin University, Changchun 130012, People's Republic of China.
Monitoring organophosphorus pesticides is significant for food safety assessment. Herein, we developed upconversion nanoparticles (UCNPs)-based self-ratiometric fluorescent platform for the detection of chlorpyrifos. The UCNPs have the ability to confine the detection and reference functions in one nanoparticle.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!