Alicia del Real
National Autonomous University of Mexico
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Featured researches published by Alicia del Real.
Review of Scientific Instruments | 2010
Adriana Gutiérrez; J. Giraldo; Ruben Velazquez-Hernandez; Maria Luisa Mendoza-López; Diego G. Espinosa-Arbelaez; Alicia del Real; Mario E. Rodríguez-García
In order to study in situ the growing process of porous materials, a new electrochemical differential photoacoustic cell (DPC) was developed. This system allows to obtain the thermal signals coming from the growing process of the pores without the external noise component. The DPC is a good system to growth porous silicon and study their growing process with reproducibility. The porous silicon samples were obtained by using electrochemical etching of (100) n-type silicon wafers with different nominal resistivity values in the range of 1-25 Omega cm. The samples were formed in a solution of hydrofluoric acid and ethanol having a composition ratio of 1:1 in volume with etching voltage of 10 V and an etching time of 2 min using back illumination provided by a laser beam with a wavelength of 808 nm. The porous samples were characterized by means of Raman microscopy, x-ray diffraction, and scanning electron microscopy. The crystallite sizes of the samples were obtained through the analysis of the micro-Raman spectra using a phonon confinement model, and the analysis of the x-ray diffractograms.
Carbohydrate Polymers | 2017
M.L. Zambrano-Zaragoza; David Quintanar-Guerrero; Alicia del Real; Elizabeth Piñón-Segundo; José F. Zambrano-Zaragoza
The main aim of this work was to evaluate the effect of the β-carotene release rate from nanocapsules incorporated into a xanthan gumcoating on the physical and physicochemical properties of fresh-cut melon (var. cantaloupe). Several coatings were studied: xanthan gum alone (XG), xanthan gum combined with nanocapsules (Ncs/XG), xanthan gum combined with nanospheres (Nsp/XG), nanocapsules (Ncs), and nanospheres (Nsp), all of which were compared to untreated fresh-cut melon in order to determine their preservation efficiency. The β-carotene release profiles from the Ncs and Ncs/XG treatments corresponded better to a Higuchi-type behavior (t1/2) for matrix systems (R2>0.95). Also observed was a good correlation between the release of β-carotene by the Ncs/XG treatment and the minor changes observed in the whiteness index (≤10%) and firmness (≤2%). These results lead to the conclusion that incorporating β-carotene nanocapsules into a polysaccharide matrix improves the properties of the coatings, thereby increasing storage time to 21days at 4°C.
Materials and Manufacturing Processes | 2007
Tomás Rangel-Ortiz; Federico Chávez-Alcalá; E. Curiel-Reyna; Alicia del Real; L. Baños; V. Manuel López-Hirata; M. E. Rodríguez
An as-cast Al–Li(2%)–Hf(1%) alloy was structurally and mechanically characterized; X-ray diffraction made it possible to detect the presence of Li and Hf and to determine their effect on aluminum lattice parameter and formation of intermetallic precipitates. The crystalline quality of the Al matrix was influenced by the Li distribution into the Al lattice. The full-width-at-half-maximum was used to determine the crystalline quality of each part of the ingot. The solution of Li in the α-Al matrix decreased the Al lattice parameter and the Hf was found to be present as an intermetallic precipitate, which improve the hardness of the as-cast alloy.
Journal of Chemistry | 2015
Isela Rojas-Molina; E. Gutiérrez-Cortez; Moustapha Bah; Alejandra Rojas-Molina; César Ibarra-Alvarado; Eric M. Rivera-Muñoz; Alicia del Real; Ma. de los Angeles Aguilera-Barreiro
Analyses of calcium compounds in cladodes, soluble dietary fiber (SDF), and insoluble dietary fiber (IDF) of Opuntia ficus indica are reported. The characterization of calcium compounds was performed by using Scanning Electron Microscopy, Energy Dispersive Spectrometry, X-ray diffraction, and infrared spectroscopy. Atomic Absorption Spectroscopy and titrimetric methods were used for quantification of total calcium and calcium compounds. Whewellite (CaC2O4·H2O), weddellite (CaC2O4·(H2O)2.375), and calcite (CaCO3) were identified in all samples. Significant differences () in the total calcium contents were detected between samples. CaC2O4·H2O content in cladodes and IDF was significantly higher () in comparison to that observed in SDF, whereas minimum concentration of CaCO3 was detected in IDF with regard to CaCO3 contents observed in cladodes and SDF. Additionally, molar ratio oxalate : Ca2
International Journal of Polymeric Materials | 1998
Margarita Victoria García-Garduño; Alicia del Real; Alfredo Maciel; Jaqueline Cañetas; V. M. Castaño
Abstract Morphology-property relationships are among the parameters which determine the practical use of polymer blends. However, very few reports in the literature realize that the preparation technique of the samples for being examined by a particular methodology, is crucial for the final results. Indeed, in the case of Electron Microscopy, for instance, for the studies of polymer and copolymer blends, very little care is taken in analyzing the effect of, for example, using dissolution for preparing samples or how a microtomy process could affect the observation. Accordingly, in this work a study of the influence of different preparation techniques for SEM (Scanning Electron Microscopy) analysis of Ethylene Vynil Acetate/Polypropylene blends (EVA/PP), including a discussion on the relevance of various physical or chemical factors affecting the observation, is presented.
Nutrients | 2017
Ezequiel Hernández-Becerra; E. Gutiérrez-Cortez; Alicia del Real; Alejandra Rojas-Molina; Mario E. Rodríguez-García; Efraín Rubio; Michelle Quintero-García; Isela Rojas-Molina
Mechanical, microstructural properties, mineral content and bone mineral density (BMD) of the femur were evaluated in growing rats fed with Opuntia ficus indica (L.) Mill. (Cactaceae) cladodes at different maturity stages as calcium source. Male weanling rats were fed with cladodes at early maturity stage (25 and 60 days of age, belonging to groups N-60 and N-200, respectively) and cladodes at late maturity stage (100 and 135 days of age, belonging to groups N-400 and N-600, respectively) for 6 weeks. Additionally, a control group fed with calcium carbonate as calcium source was included for comparative purposes. All diets were fitted to the same calcium content (5 g/kg diet). The failure load of femurs was significantly lower (p ≤ 0.05) in groups N-60 and N-200 in comparison to N-400, N-600 and control groups. The cortical width (Ct.Wi) and trabecular thickness (Tb.Th) of the femurs in control and N-600 groups were significantly higher (p ≤ 0.05) than Ct.Wi and Tb.Th of femurs in groups N-60 and N-200. Trabecular separation of the femurs in N-60 and N-200 groups showed the highest values compared with all experimental groups. The highest calcium content in the femurs were observed in control, N-600 and N-400 groups; whereas the lowest phosphorus content in the bones were detected in N-200, N-600 and N-400 groups. Finally, the BMD in all experimental groups increased with age; nevertheless, the highest values were observed in N-600 and control groups during pubertal and adolescence stages. The results derived from this research demonstrate, for the first time, that the calcium found in Opuntia ficus indica cladodes is actually bioavailable and capable of improving mineral density and mechanical and microstructural properties of the bones. These findings suggest that the consumption of cladodes at late maturity stage within the diet might have a beneficial impact on bone health.
Materials Letters | 1992
Alicia del Real; Roberto Alexander-Katz; Roberto Hernández; V. M. Castaño
Abstract Standard polystyrene latex particles were observed at various tilting angles and accelerating voltages in a transmission electron microscope. An apparent “core-shell” structure similar to that reported in some structured copolymer particles was found in the samples observed. Tilting experiments allowed us to distinguish this effect from a truly core-shell particle. The results of these experiments clearly demonstrate the important role of both tilting and voltage if reliable observations are going to be performed in transmission electron microscopy of polymeric materials.
Journal of Food Composition and Analysis | 2011
Margarita Contreras-Padilla; Esther Pérez-Torrero; Margarita I. Hernández-Urbiola; Gabriela Hernández-Quevedo; Alicia del Real; Eric M. Rivera-Muñoz; Mario E. Rodríguez-García
Food Research International | 2014
M.L. Zambrano-Zaragoza; E. Gutiérrez-Cortez; Alicia del Real; R.M. González-Reza; Moises Job Galindo-Pérez; David Quintanar-Guerrero
Carbohydrate Polymers | 2015
Alicia del Real; Daniela Wallander; Alfredo Maciel; Gerardo Cedillo; Herminia Loza