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101.
X-ray absorption near-edge spectra and temperature-programmed oxidation and reduction data demonstrate that Au(I) and Au(0) are both present in working MgO-supported gold catalysts for CO oxidation. EXAFS data indicate gold clusters with essentially the same average diameter (about 30 A) in each catalyst sample. Thus, the results provide no evidence of an effect of gold cluster size on the catalytic activity, but both the catalytic activity and the surface concentration of Au(I) were found to decrease with increasing CO partial pressure (as Au(0) was increasingly formed), demonstrating that the catalytic sites incorporate Au(I). 相似文献
102.
Julian Hofmann Dr. Tiziana Ginex Dr. Alba Espargaró Matthias Scheiner Sandra Gunesch Marc Aragó Prof. Dr. Christian Stigloher Prof. Dr. Raimon Sabaté Prof. Dr. F. Javier Luque Prof. Dr. Michael Decker 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(19):6015-6027
Many (poly-)phenolic natural products, for example, curcumin and taxifolin, have been studied for their activity against specific hallmarks of neurodegeneration, such as amyloid-β 42 (Aβ42) aggregation and neuroinflammation. Due to their drawbacks, arising from poor pharmacokinetics, rapid metabolism, and even instability in aqueous medium, the biological activity of azobenzene compounds carrying a pharmacophoric catechol group, which have been designed as bioisoteres of curcumin has been examined. Molecular simulations reveal the ability of these compounds to form a hydrophobic cluster with Aβ42, which adopts different folds, affecting the propensity to populate fibril-like conformations. Furthermore, the curcumin bioisosteres exceeded the parent compound in activity against Aβ42 aggregation inhibition, glutamate-induced intracellular oxidative stress in HT22 cells, and neuroinflammation in microglial BV-2 cells. The most active compound prevented apoptosis of HT22 cells at a concentration of 2.5 μm (83 % cell survival), whereas curcumin only showed very low protection at 10 μm (21 % cell survival). 相似文献
103.
104.
M. Angel Mateos Rocío Gálvez F. Javier Manuel de Villena José M. Pingarrón 《Mikrochimica acta》1995,120(1-4):339-349
An electroanalytical study of the herbicide propazine's reduction process in micellar solutions and oil-in-water emulsions is reported. The anionic surfactant sodium pentanesulphonate was chosen as the most suitable. The differential pulse polarograms of micellar solutions had two reduction peaks below pH 2.0, whereas only one peak was obtained above pH 2.O. Ethyl acetate was chosen as the organic solvent to form propazine emulsions. Unlike in micellar solutions, the DPP polarograms of propazine emulsions showed only one peak even at pH < 2.0, suggesting that propazine hydrolysis was hindered in the emulsified medium. The limiting current is diffusion-controlled and the electrode process is irreversible. Propazine can be determined by differential pulse polarography over the 1.0 × 10–1 – 1.0 × 10–1moll–1 and 1.0 × 10–15 – 4.0 × 10–1 moll–1 concentration ranges and the limit of detection was 2.8 × 10–1 moll–1. Of the potential interferents simazine, methoprotryne and terbutryn (alls-triazines), thiram (a dithiocarbamate), dinoseb (nitrophenolic), and heptachlor (chlorinated cyclo-diene herbicide), only the first two were significant (10% error for equimolar concentrations). The method was applied to the determination of propazine in spiked drinking water. At a concentration level of 2.0 × 10–1 moll–1 a recovery of 94 ± 6% was obtained, after tenfold concentration on Sep-Pak. 相似文献
105.
Susana Cabredo Pinillos Jesú s Sanz Asensio Javier Galb n Bernal 《Analytica chimica acta》1995,300(1-3):321-327
This paper describes a method for the simultaneous determination of As(III), Sb(III) and Se(IV) by combining hydride generation and gas phase molecular absorption spectrometry. A system for continuous hydride generation has been designed and developed, based on the use of a double process of gas-liquid separation, and optimal compromise operation conditions for the three compounds have been found. After generation, the hydrides are collected in a liquid nitrogen cryogenic trap, and then evaporated and driven to the flow cell of a diode array spectrophotometer, in which the transient signals over the 190–250 nm wavelength interval are measured. Under the recommended conditions (sample flow: 35 ml min−1, 0.5 M HCl; reductor flow: 4 ml min−1 of 4% NaBH4, solution) linear response ranges above 50 μg 1−1 for As(III), 30 μg 1−1 for Sb(III) and 200 μg 1−1 for Se(IV) are obtained with detection limits of 22 μg 1−1, 15 μg 1−1 and 65 μg 1−1, respectively. Multiwavelength linear regression equations were used for the simultaneous determination of the three elements in different synthetic samples, with good precision and accuracy and to study simultaneously the interference from different chemical species for the three compounds. Results were similar to those obtained by other techniques using hydride generation. 相似文献
106.
J. Miguel Vadillo M. Esther Gonzalez Isabel Carretero J. Javier Laserna 《Mikrochimica acta》1995,118(3-4):273-282
Micellar liquid chromatography (MLC) and capillary zone electrophoresis (CZE) have been evaluated for the analysis of twelve banned drugs in sport including diuretics and -blockers. In MLC, a sodium dodecylsulphate aqueous solution has been used as mobile phase using an octadecylsilica column. In CZE, a pH 8 buffer solution and a silica capillary have been employed. Parameters of retention and efficiency have been compared. Limits of detection with UV detection at 254 nm and relative standard deviations for atenolol, furosemide, nadolol, spironolactone and triamterene were established and compared in both techniques. Examples of direct urine injection into the separation systems are presented. Drugs overlapping in MLC are well resolved in CZE, while the opposite is true for a limited number of drugs. Some interferences from urine may arise in CZE. The selectivity of analysis would be greatly enhanced by using both techniques, which require only filtration as pre-treatment. 相似文献
107.
Antonio Doménech Noemí Montoya Javier Alarcón 《Journal of Solid State Electrochemistry》2012,16(3):963-975
The voltammetry of nanoparticles and scanning electrochemical microscopy are applied to characterize praseodymium centers
in tetragonal and monoclinic zirconias, doped with praseodymium ions (Pr
x
Zr1−x
O2), prepared via sol–gel routes. Doped zirconia nanoparticles were synthesized by a sol–gel liquid-phase route and characterized
by different techniques, including X-ray diffraction powder pattern, ultraviolet–visible diffuse reflectance spectroscopy,
infrared spectroscopy, and transmission electron microscopy (TEM). Gels annealed at around 400 °C yielded tetragonal Pr
x
Zr1−x
O2 phases. The monoclinic forms of Pr-doped ZrO2 were obtained by annealing at temperatures higher than 1,100 °C. TEM micrographs proved that the size of the nanoparticles
produced was dependent on their crystalline form, around 15 and 60 nm for tetragonal and monoclinic, respectively. The electrochemical
study confirmed that a relatively high content of praseodymium cation was in the chemical state (IV), i.e., as Pr4+, in both zirconia host lattices. The catalytic and photocatalytic effects of Pr4+ centers located in the monoclinic zirconia lattice on nitrite reduction and oxygen evolution reaction were studied. 相似文献
108.
Martínez de Baroja N Garín J Orduna J Andreu R Blesa MJ Villacampa B Alicante R Franco S 《The Journal of organic chemistry》2012,77(10):4634-4644
A series of new 4H-pyran-4-ylidene donor-based chromophores with a thiophene ring in the spacer has been synthesized. The linear and nonlinear optical (NLO) properties of these compounds have been determined and compared with the results of computational calculations. The position of the thiophene ring proved essential to optimize the figure of merit μβ, with the best results obtained when the heterocyclic system was closer to the donor moiety. 相似文献
109.
Maria-Teresa Clavaguera-Mora Narcís Clavaguera Javier Rodríguez-Viejo 《Monatshefte für Chemie / Chemical Monthly》2005,12(8):1947-1953
The primary crystallization of molten alloy systems at high undercooling is studied by a precise quantitative analysis of
the calorimetric signal obtained during the transformation in terms of the reaction rate under isothermal and continuous heating
regimes. It is shown that, under specific conditions, namely, stoechiometric primary precipitates, generalized relationships
for the crystallization enthalpy and the reaction rate may be obtained. 相似文献
110.
Lluís Guijarro lvaro Martínez-Camarena Javier U. Chicote Antonio García-Espaa Enrique García-Espaa Mario Incln Begoa Verdejo Jorge Gonzlez-García 《Molecules (Basel, Switzerland)》2021,26(13)
Nucleic acids are essential biomolecules in living systems and represent one of the main targets of chemists, biophysics, biologists, and nanotechnologists. New small molecules are continuously developed to target the duplex (ds) structure of DNA and, most recently, RNA to be used as therapeutics and/or biological tools. Stimuli-triggered systems can promote and hamper the interaction to biomolecules through external stimuli such as light and metal coordination. In this work, we report on the interaction with ds-DNA and ds-RNA of two aza-macrocycles able to coordinate Zn2+ metal ions and form binuclear complexes. The interaction of the aza-macrocycles and the Zn2+ metal complexes with duplex DNA and RNA was studied using UV thermal and fluorescence indicator displacement assays in combination with theoretical studies. Both ligands show a high affinity for ds-DNA/RNA and selectivity for ds-RNA. The ability to interact with these duplexes is blocked upon Zn2+ coordination, which was confirmed by the low variation in the melting temperature and poor displacement of the fluorescent dye from the ds-DNA/RNA. Cell viability assays show a decrease in the cytotoxicity of the metal complexes in comparison with the free ligands, which can be associated with the observed binding to the nucleic acids. 相似文献