Effects of a chayotte (Sechium edule) extract (macerated) on the biochemistry of blood of Wistar rats and on the action against the stannous chloride effect.
ABSTRACT The use of natural products as medicines has been growing in the entire world. There are concerns that these products may contain potentially toxic ingredients and contaminants such as heavy metals. The labeling of blood constituents with technetium-99m has been influenced by the presence of natural extracts. We evaluated the influence of a chayotte (Sechium edule) extract (100% v/v macerated) on the labeling of blood elements with 99mTc. The animals were treated with the extract during 15 days. Samples of blood were carried out with specific blood biochemistry kits. The present study analyzed the influence ofchayotte in the survival of the strain of Escherichia coli AB1157 submitted to reactive oxygen species induced by stannous chloride. There was a reduction of the lethal effect induced by stannous chloride on the survival of the E. coli culture in the presence of chayotte. The results indicated a decrease in the level of glucose and globulin The effect of the extract could be explained by its metabolic transformation inducing the generation of oxidant metabolites. The culture of bacteria when was treated with stannous chloride and chayotte simultaneously, the extract could be reacting with stannous chloride ions, protecting them against the oxidation avoiding the generation of reactive oxygen species.
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ABSTRACT: TiO2 nanoparticle films were prepared by plasma-enhanced chemical vapor deposition, and subsequently, their surfaces were treated by TiCl4 and O2 plasmas, respectively. Experiments of phenol photodegradation show that the TiO2 film treated by O2 plasma presents much higher photocatalytic activity than that treated by TiCl4 plasma. X-ray photoelectron spectral analyses indicate that more active species, such as O2−, are formed on surface of the film treated by O2 plasma than that treated by TiCl4 plasma. The energy levels of the surface species and the photogenerated electronic transitions via these surface species are further investigated by surface photovoltage spectra (SPS) and electric field-induced surface photovoltage spectra (EFISPS).Colloids and Surfaces A Physicochemical and Engineering Aspects 07/2005; 262(1):181-186. · 2.35 Impact Factor
- Chemical Reviews 05/1995; 95(3):735-758. · 45.66 Impact Factor
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ABSTRACT: Nanosized Zr-doped TiO2 photocatalysts were prepared using the homogenous co-precipitation method from aqueous solutions containing TiOSO4 and ZrCl4 by urea as a precipitation agent, with subsequently annealing at various temperatures of 400–1100°C. Structural changes of the photocatalysts upon heating were studied by X-ray powder diffraction. Anatase-to-rutile phase transformation is shifted to higher temperatures in comparison with undoped TiO2. Spherical clusters morphology was revealed by scanning electron microscopy. Energy dispersive X-ray spectrometry confirmed a Zr content of 0.8mol% in all samples. The band-gap energies were determined from diffuse reflectance UV–vis spectra. The spectral thresholds are shifted toward visible region, except for the unheated catalyst. X-ray photoelectron spectroscopy measurements revealed that the binding energy of Ti 2p3/2 electrons is not influenced by Zr doping. On the contrary, the binding energy of Zr 3d5/2 electrons is lower than that of Zr ions in ZrO2. Photocatalytic degradation of 4-chlorophenol was employed to test photoactivity of the catalyst. The photocatalyst annealed at 900°C has a 1.5 times higher degradation rate than the standard TiO2 P25 (Degussa).Applied Catalysis B Environmental 06/2007; 74(1):83-91. · 6.01 Impact Factor