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Véronique Vacchina Sébastien Oguey Catherine Ionescu David Bravo Ryszard Lobinski 《Analytical and bioanalytical chemistry》2010,398(1):435-449
A method was developed for the determination of metal complexes with glycine (glycinates, [M(Gly)x(H2O)y(SO4)z]n, where M denotes Zn, Cu, Mn and Fe) in premix samples used for the preparation of animal feeds enriched in essential trace
elements. The method was based on the extraction of the glycinates with 10 mM ammonium acetate (pH 7.4) followed by their
determination using capillary electrophoresis with ICP MS detection. The stability of the glycinates in solution was verified
by electrospray TOF-MS. Each supplement was shown to be a mixture of complexes, with polymerization degrees ranging from n = 1 to n = 4 (depending on the metal), that were fully or partially dehydrated. The metal glycine complex moiety was found to be preserved
during capillary electrophoresis. The detection limits, calculated as three times the standard deviation of the blank plus
the blank, were between 0.05 and 0.2 μg mL−1 (as the metal), and the calibration curves were linear, allowing the analysis of premix samples. Repeatability for glycinate
standards was below 12%, and analytical precision was typically within 15%. 相似文献
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Comorosan S Polosan S Jipa S Popescu I Marton G Ionescu E Cristache L Badila D Mitrica R 《Journal of photochemistry and photobiology. B, Biology》2011,102(1):39-44
Free radicals generation is inhibited through green light (GL) irradiation in cellular systems and in chemical reactions. Standard melanocyte cultures were UV-irradiated and the induced cellular reactive oxygen species (ROS) were quantified by the fluorescence technique. The same cell cultures, previously protected by a 24h GL exposure, displayed a significantly lower ROS production. A simple chemical reaction is subsequently chosen, in which the production of free radicals is well defined. Paraffin wax and mineral oil were GL irradiated during thermal degradation and the oxidation products checked by chemiluminescence [CL] and Fourier transform infrared spectra [FT-IR]. The same clear inhibition of the radical oxidation of alkanes is recorded. A quantum chemistry modeling of these results is performed and a mechanism involving a new type of Rydberg macromolecular systems with implications for biology and medicine is suggested. 相似文献
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In this paper we consider a coupled Wave-Klein—Gordon system in 3D, and prove global regularity and modified scattering for small and smooth initial data with suitable decay at infinity. This... 相似文献