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Reagent-free determination of amikacin content in amikacin sulfate injections by FTIR derivative spectroscopy in a continuous flow system

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Journal of Pharmaceutical Analysis 2014年第2期4卷 125-131页

作者： José F.Ovalles Máximo Gallignani María R.Brunetto Rebeca A.Rondón Carlos Ayala departamento de Análisis y Control Facultad de Farmacia y BioanálisisUniversidad de Los AndesMérida 5101AVenezuela laboratorio de espectroscopia Molecular Departamento de QuímicaFacultad de CienciasUniversidad de Los AndesMérida 5101AVenezuela

The quantitative estimation of amikacin （AMK） in AMK sulfate injection samples is reported using FTIR-derivative spectrometric method in a continuous flow system. Fourier transform of mid-IR spectra were recorded without any sample pretreatment. A good linear calibration （r40.999, %RSDo 2.0） in the range of 7.7-77.0 mg/mL was found. The results showed a good correlation with the manufacturer＇s and overall they all fell within acceptable limits of most pharmacopoeial monographs on AMK sulfate.

关键词： Amikacin FlrIR derivative spectro-metry Continuous flow system Pharmaceuticalpreparation Injection Sulfate

Application of 3A Zeolite Prepared from Venezuelan Kaolin for Removal of Pb (II) from Wastewater and Its determination by Flame Atomic Absorption Spectrometry

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American Journal of Analytical Chemistry 2013年第10期4卷 584-593页

作者： Wendy Rondón David Freire Zully de Benzo Angela B. Sifontes Yorbin González Maribel Valero Joaquín L. Brito laboratorio de espectroscopia Molecular Facultad de Ciencias Universidad de Los Andes Mérida Venezuela laboratorio de Fisicoquímica de Superficies Centro de Química Instituto Venezolano de Investigaciones Científicas IVIC Caracas Venezuela laboratorio de Química Analítica Centro de Química Instituto Venezolano de Investigaciones Científicas IVIC Caracas Venezuela

This work consists in the use of a 3A zeolite (K-LTA) obtained by a process of exchange of sodium for potassium (4A zeolite), synthesized from Venezuelan kaolin for the removal of Pb (II) ions from aqueous solutions by batch process mode in order to consider its application in treating industrial wastewaters. The 3A zeolite was characterized for X-ray powder diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR) and scanning electron microscopy and energy dispersive X-ray microanalysis (SEM-EDX). The metal concentration in the equilibrium Ce (mg·L-1) after adsorption with 3A zeolite was analyzed using flame atomic absorption spectrometry (FAAS). The influences of the solution pH, contact time, metal initial concentration and adsorbent dosage have been studied. The retention of metal occurring at pH values around 6.5 and the adsorption equilibrium was obtained at 60 min. The equilibrium process was well described by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models. The Langmuir parameters qm (mg·g-1) and b (L·mg-1) (which are related to the sorption capacity and constant of sorption energy) obtained were 14.64 and 5.42 respectively. The Pb (II) experimental uptake was about 14.56 mg·g-1, a little smaller than the theoretical one given by Langmuir isotherm model. The regression parameters and correlation coefficients (R) indicate that the adsorption data for Pb (II) removal fit better the Langmuir isotherm model. Moreover, 0 1/n 1 (1/n is 0.13), indicating that adsorption of metal ions on the zeolite, is a favorable physical process. The application of removing of the metal lead from real samples was examined by industrial wastewater samples. For all samples, the percentage of recovery was found with accuracy of more than 98%. The present work suggests 3A zeolite used as a sorbent material with relatively low cost, obtained from Venezuelan raw material;it is a candidate for removal lead ion and probably other cationic heavy metal species

关键词： Adsorption Wastewater Lead (II) Ion Zeolite Langmuir Isotherm FAAS

Study of Functionalized Gold Nanoparticles with Anti-gp63 IgG Antibody for the detection of Glycoprotein gp63 in Membrane Surface of LeishmaniaGenus Parasites

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American Journal of Analytical Chemistry 2013年第7期4卷 100-108页

作者： Pedro Rodríguez Humberto Rojas Miguel Medina Jazzmin Arrivillaga Yosue Francisco Fracehuli Dager Vincent Piscitelli Manuel Caetano Alberto Fernández Jimmy Castillo Centro de Microscopia Electrónica Facultad de Ciencias Universidad Central de Venezuela Caracas Venezuela departamento de Biología Universidad Simón Bolívar Caracas Venezuela Escuela de Biología Facultad de Ciencias Universidad Central de Venezuela Caracas Venezuela laboratorio de espectroscopia Laser Facultad de Ciencias Universidad Central de Venezuela Caracas Venezuela

In this work we present the preparation and functionalization of gold nanoparticles (AuNPs) for the detection of presence of gp63 glycoprotein in the surface of Leishmania genus parasites. AuNPs were prepared by induced laser ablation in a clean and biologically suitable media. The nanoparticles were functionalized with anti-gp63 lgG antibody in order to study the interaction with the glycoprotein component gp63 (63 kDa) present on the membrane surface of Leishmania genus parasites. The functionalized AuNPs showed potential as a spectrometric indicator of the parasite existence, both by the detection of the presence of the gp63 in solution and through the specific interaction with the parasites in vitro. The specificity of the study opens a new line of research on the use of modified nanoparticles in the development of a fast and easy assay for Leishmaniosis diagnostics.

关键词： Leishmania Nanoparticles Surface Plasmon Resonance gp63 Protein

Mapping of Radon (220Rn and 222Rn) Concentration Distribution in a Microclimate Condition Cellar Using Nuclear Track Methodology

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Journal of Environmental Protection 2019年第7期10卷 919-928页

作者： Guillermo Espinosa José-Ignacio Golzarri Alfonso M. Román-Sedano Fermín Castillo Instituto de Física Universidad Nacional Autónoma de México Circuito de la Investigación Científica Ciudad Universitaria Coyoacán Ciudad de México México laboratorio de espectroscopia Instituto de Ciencias Físicas Universidad Nacional Autónoma de México Cuernavaca México

This work presents the results of the Radon (220Rn and 222Rn) measurements made with 486 chips of CR-39 (Allyl Dyglicol Poly Carbonate) MASL? bared detectors, in a reticular mode distribution, inside of a cellar with average indoor radon concentration 862 ± 49 Bq/m3. The exposure time was 3 months, in microclimate condition of constant temperature, humidity, barometric pressure and no airflow. After these 3 months, all the detectors were chemically etched in KOH 6.25 M solution at 60°C ± 1°C for 18 hours, following a very well established protocol for indoor radon survey by the Dosimetry Applications Laboratory of the Physics Institute of the National Autonomous University of Mexico, and later read automatically by CADIS (Counting Automatically Digital Image System). The results show that each one of the nine measured planes is not homogeneous presenting important differences of indoor radon concentration values. Specifically, the Radon (220Rn and 222Rn) concentration levels vary for each measured point within the cellar. It is a very important observation to consider for the calculation of dose and radiological risk.

关键词： Indoor Radon Mapping Radon Distribution Nuclear Track Methodology NTM

Effect of the Substitution of Sand by Rubber of Waste Tires on the Mechanical Properties of Hydraulic Concrete and Exposure to Gamma Radiation

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Journal of Minerals and Materials Characterization and Engineering 2021年第3期9卷 245-256页

作者： Jesús M. Colín de la Cruz Carmen Gabriela Guzmán Fermín Castillo Mejía Benjamin Leal Acevedo Osvaldo Flores Cedillo Isabel Gamboa de Buen Arturo Molina Ocampo Horacio Martínez Valencia Facultad de Ciencias Químicas e Ingeniería Universidad Autónoma del Estado de Morelos Cuernavaca México laboratorio de espectroscopia Instituto de Ciencias Físicas Universidad Nacional Autónoma de México Cuernavaca México Instituto de Ciencias Nucleares Universidad Nacional Autónoma de México México City México Centro de Investigación en Ingeniería y Ciencias Aplicadas UAEM Cuernavaca México

For a long time and until now, rubber is the most used material for the manufacture of tires for motor vehicles. Unfortunately, once the tire meets its life cycle, the remaining rubber cannot be recycled, so the tires are discarded in collection centers and often in clandestine dumps. This represents a serious environmental problem because, in one case, these waste tires become breeding grounds for insects and wildlife that is harmful to humans. In the second case, the tires are burned, releasing highly damaging gases into the atmosphere. On the other hand, concrete is worldwide the construction material par excellence. It is basically composed of cement, gravel and sand. Mixing these three components in different proportions, their mechanical strength in compression can be increased. However, due to its fragile nature, concrete, once a crack is formed, it rapidly advances by fragmenting the material and producing its rapid collapse. In the present work, in order contribute to the care of the environment as well as to modify the fracture mode of the concrete, rubber particles obtained from waste tires were used as sand substitute in hydraulic concrete. In addition, rubber modified samples concrete were lately exposed to 70 kGy of gamma radiation in order to study the effects of this radiation on the mechanical deformation of concrete. The results showed a decrease in the mechanical properties of the concrete with rubber particles with respect to the traditional concrete itself. However, such decreases were offset by the fact that samples with rubber addition do not collapses as fast as the free rubber samples. The acquired data pave the way for research with great benefits, such as the use of recycled tires in concrete for its fracture mode modification in a beneficial way, as well as a possible decrease in the cost of concrete.

关键词： Hydraulic Concrete Scrap Tire Rubber Strength Gamma Radiation Mechanical Properties

A Study of the Structural, Optical and Electrical Properties of SnS Thin Films Modified by Plasma

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材料科学与工程（中英文B版） 2013年第6期3卷 352-358页

作者： Aar6n Gomez Horacio Martinez Manuela Calixto-Rodriguez David Avellaneda Pedro Guillermo Reyes Osvaldo Flores laboratorio de Fisica Avanzada Facultad de Ciencias Universidad Autonoma del Estado de Mexico Estado de Mexico Mexico laboratorio de espectroscopia Instituto de Ciencias Fisicas Universidad Nacional Aut6noma de Mdxico Cuernavaca MorelosMdxico Intituto de Energia Renovable Universidad Nacional Aut6noma de Mdxico Cuernavaca Morelos M~xico Facultad de Ingenieria Meconica y Electrica Universidad Autonoma de Nuevo Leon Mexico

SnS thin films were deposited by chemical bath deposition technique and treated using glow discharge O2 plasma. The pressure discharge was 3 Torr, discharge voltage of 2.5 kV and 20 mA of discharge current. The as-deposited and treated thin films were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The photoconductivity and electrical effects of SnS have been studied. The SnS thin films had an orthorhombic crystalline structure. The optical gap changed from 1.61 to 1.84 eV due to the O2 plasma treatment. The conductivity shows a marked increase with the treatment, from 2.56 × 10-6 (??cm)-1 for as-deposited film until 0.10 (??cm)-1 for the film treated at 180 min. This result is a suitable range of conductivity for the improvement of the solar cell with SnS as an absorber material.

关键词： SnS薄膜晶体结构等离子体改性电学性能光学扫描电子显微镜等离子体处理沉积技术