A new fluorophore pyrido[1,2-]benzimidazole based ratiometric fluorescent probe for the selective detection of sulfite ions in water was investigated. It shows large (pseudo) Stokes shifts (260 nm), high FRET efficiency, high selectivity and sensitivity. A distinct color change from red to colorless was observed and importantly, it proves to be a convenient and efficient tool to detect the sulfite levels in sugar samples.
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http://dx.doi.org/10.1039/c8ra08967a | DOI Listing |
Talanta
December 2024
Macau Centre for Research and Development in Chinese Medicine, State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, 999078, China. Electronic address:
Unreasonable or illegal utilization of pesticides may lead to pollution of agricultural products, especially with some persistent but effective pesticides. Hence, there is an urgent need to develop sensitive and rapid methods for pesticide detection to ensure the safety of agricultural products. Herein, a dual-mode ratiometric sensing system utilizing two gold nanoclusters (G/R-AuNCs) was designed and constructed for paraquat (PQ) detection, a typical, highly toxic, widely used pesticide.
View Article and Find Full Text PDFFood Chem
December 2024
Laboratory of Functional Polymers, School of Materials Science and Engineering, Linyi University, Linyi 276005, China. Electronic address:
Organicphosphorus is a ubiquitous pesticide that has potential hazards to human health and environmental well-being. Therefore, the precise identification of residues of organophosphorus pesticides (OPs) emerges as an urgent necessity. A ratiometric fluorescent sensor for the detection of OPs by leveraging the catalytic activities of Ce and Ce on the two fluorescent substrates 4-Methylumbelliferyl phosphate (4-MUP) and o-phenylenediamine (OPD) correspondingly was designed.
View Article and Find Full Text PDFBiosensors (Basel)
December 2024
State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China.
Peroxynitrite (ONOO) plays an important role in many physiological and pathological processes. Excessive ONOO in cells leads to oxidative stress and inflammation. However, precise monitoring of ONOO levels in specific organelles (e.
View Article and Find Full Text PDFBiosensors (Basel)
December 2024
School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
In this study, 3,4-diaminobenzoic acid (DABA) was introduced into the porphyrin metal-organic framework (PCN-224) for the first time to prepare a ratiometric fluorescent probe (PCN-224-DABA) to quantitatively detect ferric iron (Fe(III)) and selenium (IV) (Se(IV)). The fluorescence attributed to the DABA of PCN-224-DABA at 345 nm can be selectively quenched by Fe(III) and Se(IV), but the fluorescence emission peak attributed to tetrakis (4-carboxyphenyl) porphyrin (TCPP) at 475 nm will not be disturbed. Therefore, the ratio of I/I with an excitation wavelength of 270 nm can be designed to determine Fe(III) and Se(IV).
View Article and Find Full Text PDFAnal Chem
December 2024
Shandong Provincial Key Laboratory of Detection Technology for Tumor Markers, College of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China.
To answer the call for effective and timely intervention in cardiovascular diseases (CVDs), the development of fluorescent probes that can precisely identify atherosclerotic plaques, the root cause of various fatal CVDs, is highly desirable but remains a great challenge. Herein, by integrating bis(trifluoromethyl)benzyl and phenothiazine into the coumarin matrix, a robust fluorescent probe, NOR1, has been developed. NOR1 responds sequentially to lipid droplets (LDs) and HClO via fluorescence turn-on and ratiometric readouts, respectively, with a fast response rate (within 70 s for LDs and 80 s for HClO), excellent sensitivity (detection limit: 0.
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