Respirometric microbial assays are gaining popularity, but their uptake is limited by the availability of optimal O2 sensing materials and challenge validating with complex real samples. We conducted a comparative evaluation four different O2-sensing probes based on Pt-porphyrin phosphors in respirometric bacterial performed standard time-resolved fluorescence reader. The macromolecular MitoXpress, nanoparticle NanO2 small molecule PtGlc4 PtPEG4 were assessed E. coli cells five growth media:...

Well dispersed non-stabilized lanthanum oxyfluoride and fluoride nanoparticles were prepared in situ thin silica films from rapid thermal decomposition of tris-trifluoroacetate under nitrogen atmosphere. The obtained sol–gel method spin-coating. spectroscopic properties the as well into studied order to apply system future photonic applications such erbium(III)-doped waveguide amplifiers. characterized by XRD, FT-IR, Transmission Electron Microscopy, Confocal Raman Spectroscopy steady-state...

Abstract The synthesis and characterization of Fe 3 O 4 magnetic nanoparticles (MNPs) obtained by the solvothermal method in ethyleneglycol with addition polyethyleneglycol (PEG) molar mass 4000, 8000 20000 g mol −1 are described, aimed at evaluating its effect on size, morphology stability nanoparticle. syntheses were carried out solubilizing precursors 85 140 °C, providing smaller as well crystallites higher temperatures, while PEG was less evident. Measurements nanoparticle surface areas...

A simple setup and methodology for barometric calibration of quenched phosphorescence oxygen sensors are described, which utilize a standard rotary evaporator (Rotavap) system equipped with digital vacuum pump. They were demonstrated panel different sensing materials based on PtBP dye, including solid-state sensor coatings substrates (membrane inserts, stickers or inner wall the flask), as well liquid formulations. The inside flask exposed to conditions created by Rotavap (dry humid air,...

Passivated nanoparticles of europium(III)-doped yttrium, lanthanum and gadolinium oxides were synthesized by a modified sol–gel method their luminescent properties studied. The passivation the surface is confirmed infrared spectroscopy. Gadolinium yttrium crystalize as cubic phases while oxide has hexagonal phase. emission spectra samples show broad transitions attributed to europium(III) ions probably due structure disorder caused size also high surface/volume ratio nanoparticles....

Abstract New luminescent temperature probes were synthesized based on the dispersion of europium(III) [Eu(tta) 3 (H 2 O) ] complex (tta=thenoyltrifluoroacetonate), and covalent bond (adppo)(H O)] (adppo) (adppo=allyldiphenylphosphine oxide) complexes by hydroslylilation reaction between allyl group hydride terminal polydimethylsiloxane (PDMS). Phosphine oxide coordination to ion increases lifetime values changes emission profile a more symmetrical chemical environment. The membranes shows...

This work reports on the synthesis and spectroscopic characterization of oleylamine-stabilized lanthanide-doped LaF₃ nanoparticles isolated or dispersed in polydimethylsiloxane (pdms).

Abstract A new oxygen‐sensitive optical probe based on the [Tb(3,5‐dcba) 3 ]⋅1/2 H 2 O (3,5‐dcba=3,5‐dichlorobenzoate) complex, which is chemically attached to a phosphine‐oxide‐functionalized polydimethylsiloxane presented. The hybrid material shows green emission and transparency in visible range. optically sensitive photostable under excitation at 350 nm highest oxygen sensitivity, I 0 /I 100 equal 8.9 1 atm, among probes homonuclear lanthanide compounds. Furthermore its reversibility...

Biological applications of phosphorescent probes for sensing molecular oxygen (O2) and bioimaging have gained popularity, but their choice is rather limited. We describe a family new heterosubstituted bioprobes based on the Pt(II)-tetrakis(pentafluorophenyl)porphyrin (PtPFPP) dye. The are produced by simple click modification its para-fluorine atoms with thiols, such as 1/2-thio-glucose, thio-poly(ethylene glycol) (PEG), or cysteamine. were designed to one cell-targeting moiety three polar...

Using several types of Pt-porphyrin based oxygen sensing materials and conditions, we evaluated comparatively four different detection platforms that perform phosphorescence lifetime (PLT) measurements in the microsecond time domain. The time-resolved fluorescence reader Victor 2, which utilises Rapid Lifetime Determination method Xe-flash lamp excitation, produced stable but inaccurate readings at PLT values < 15 µs, affected by flash-lamp afterglow sensor heterogeneity oxygenated...

Complexos de íons lantanídeos ancorados à uma matriz polimérica apresentam diversas aplicações, tais como sensores químicos.No presente trabalho, buscou-se estudar o efeito causado por diferentes concentrações destes complexos e estruturas poliméricas nas propriedades ópticas emissão

As nanopartículas de sílica (NP-SiO 2 ) têm ocupado uma posição destaque na área da química devido as suas diversas aplicações dentro do ramo industrial e científico, como por exemplo, pigmentos, carreadores fármacos ativos, sensores isoladores térmicos.A fim se seguir desta mesma linha pesquisa, neste trabalho foi desenvolvido um nanosensor fluorescente baseado imobilização complexo lantanídeo [Tb(pfba) 3 ].H O em constituídas para futura determinação oxigênio dissolvido água.As foram...

Using several types of Pt-porphyrin based oxygen sensing materials and conditions, we evaluated comparatively four different detection platforms that perform phosphorescence lifetime (PLT) measurements in the microsecond time domain. The time-resolved fluorescence reader Victor 2, which utilises Rapid Lifetime Determination method Xe-flash lamp excitation, produced stable but inaccurate readings at PLT values <15 µs, affected by flash-lamp afterglow sensor heterogeneity oxygenated...