tellurium and molybdenum-disulfide

A novel turn-on fluorescence assay was developed for the rapid detection of glutathione (GSH) based on the inner-filter effect (IFE) and redox reaction. Molybdenum disulfide quantum dots (MoS₂ QDs), which have stable fluorescent properties, were synthesized with hydrothermal method. Manganese dioxide nanosheets (MnO₂ NSs) were prepared by exfoliating the bulk δ-MnO₂ material in bovine serum albumin (BSA) aqueous solution. The morphology structures of the prepared nanoparticles were characterized by transmission electron microscope (TEM). Studies have shown that the fluorescence of MoS₂ QDs could be quenched in the presence of MnO₂ NSs as a result of the IFE, and is recovered after the addition of GSH to dissolve the MnO₂ NSs. The fluorescence intensity showed a good linear relationship with the GSH concentration in the range 20⁻2500 μM, the limit of detection was 1.0 μM. The detection method was applied to the analysis of GSH in human serum samples. This simple, rapid, and cost-effective method has great potential in analyzing GSH and in disease diagnosis.

Topics: Biosensing Techniques; Disulfides; Fluorescent Dyes; Glutathione; Gold; Humans; Limit of Detection; Manganese Compounds; Metal Nanoparticles; Molybdenum; Oxides; Quantum Dots; Tellurium

An ultrasensitive photoelectrochemical (PEC) aptasensor for lead ion (Pb

Topics: Aptamers, Nucleotide; Biosensing Techniques; Cadmium Compounds; Disulfides; Electrochemical Techniques; G-Quadruplexes; Ions; Lead; Manganese; Molybdenum; Nanocomposites; Particle Size; Photochemical Processes; Quantum Dots; Sulfides; Surface Properties; Tellurium