tellurium and 3-aminobenzeneboronic-acid

Water-soluble cadmium telluride quantum dots capped with 3-mercaptopropionic acid were synthesized and further modified with 3-aminophenylboronic acid to form boronic acid-functionalized quantum dots (QDs). Under excitation at 350 nm, the modified QDs display yellow fluorescence with a peak at 566 nm. On exposure to copper(II), the fluorescence of the QDs is quenched. Under optimal conditions, fluorescence drops linearly in the 0.01 to 20 μM Cu(II) concentration range, and the detection limit is 7.6 nM. This fluorescent probe was applied to the determination of Cu(II) in spiked human serum and water samples and gave satisfactory results. Graphical abstract Schematic presentation of the principle for fluorometrice detection of copper(II) based on the use of boronic acid-functionalized cadmium telluride quantum dots (CdTe QDs).

Topics: Boronic Acids; Cadmium Compounds; Copper; Fluorescent Dyes; Humans; Limit of Detection; Quantum Dots; Rivers; Spectrometry, Fluorescence; Tellurium; Water Pollutants, Chemical

Electrostatic embedding of yeast cells in voids with similar size has been realized, which makes the bottom surface of the cells shielded. The free top surface of the cells was further decorated to afford asymmetric surface-modified living cells. Various self-assembled architectures of the cells were then constructed by changing the ratio of different cells with or without modification.

Topics: Boronic Acids; Cadmium; Cells, Immobilized; Fluorescence; Polystyrenes; Porosity; Quantum Dots; Saccharomyces cerevisiae; Static Electricity; Surface Properties; Tellurium

In this paper, 3-aminobenzeneboronic acid functionalized Mn(2+)-doped ZnTe/ZnSe quantum dots (APBA-dQDs) were prepared. The APBA functional groups had strong binding ability with F(-), resulting in the quenchment of dQDs photoluminescence (PL). Under the optimal condition, the fluorescence intensity of APBA-dQDs was related linearly to the concentration of F(-) in the range of 0.25-1.5µmol/L with a detection limit of 0.1µmol/L. The selectivity of fluorescence quenching of APBA-dQDs for F(-) was enhanced. Moreover, the proposed methodology for the sensing of F(-) at EM 560nm in MC3T3-E1 osteoblastic cells was demonstrated and got a satisfactory results. The results indicate that the APBA-dQDs are promising candidates for intracellular in MC3T3-E1 osteoblastic cells. To the best of our knowledge, it was the first report of F(-) sensing by using the quenched fluorescence of APBA-dQDs in non-cancerous cells.

Topics: Animals; Boronic Acids; Cell Line; Fluorides; Manganese; Mice; Osteoblasts; Quantum Dots; Selenium Compounds; Tellurium; Zinc Compounds