Direct Spectrophotometry
Mostrando 1-12 de 34 artigos, teses e dissertações.
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1. Optimización de un procedimiento para la determinación de oro mediante espectrofotometría UV/Vis
ABSTRACT The main objective of the research group is the recovery of valuable metals (contained in PCB’s) such as Cu, Au, Ag, Pt, Pd, etc., by hydrometallurgical alternatives to the current ones used in mining. One of the biggest difficulties that has encountered the research group is the lack of availability of an adequate, simple and reliable quantitativ
Matéria (Rio J.). Publicado em: 19/07/2018
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2. Applying Different Sample Treatment Strategies for Evaluating Phosphorus Distribution in Orange Juice
Assessment of phosphorus in fruit juices is of great interest due to its essentiality and nutritional properties. This study applied sample treatment strategies to determine phosphorus in fractions of juices. Firstly, total phosphorus (Ptotal) was determined from digestion and sample suspension exploring direct analysis by inductively coupled plasma optical
J. Braz. Chem. Soc.. Publicado em: 2018-07
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3. Exploring the Versatility of an Atomic Absorption Spectrometer: Application to Direct Molecular Determination of Caffeine and Propranolol
A simple strategy using an atomic absorption spectrometer (AAS) for the direct determination of molecular compounds is proposed. The determination of caffeine and propranolol employing atomic absorption instrumentation was conducted, monitoring the emission lines of Fe (271.9 nm) and Mg (285.2 nm), respectively, using a quartz cuvette (1.0 cm) positioned in
J. Braz. Chem. Soc.. Publicado em: 2016-04
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4. Dielectric Behavior of Alginate-Based Hydrogel Containing Neomycin-Loaded Lipid Nanovesicles under Influence of Electrical Potentials
Dielectric characterization has been applied as a convenient tool for evaluation of transport and polarization mechanisms in soft materials. In this work, we have explored the study of charge transport mechanisms in alginate hydrogel containing neomycin-loaded liposomes. For comparison, drug release kinetic was evaluated by using UV-Vis spectrophotometry and
J. Braz. Chem. Soc.. Publicado em: 2016-01
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5. Rat subcutaneous tissue response to calcium silicate containing different arsenic concentrations
Objective: To evaluate the response of rat subcutaneous tissue in implanted polyethylene tubes that were filled with GMTA Angelus and Portland cements containing different arsenic concentrations. Material and Methods: Atomic absorption spectrophotometry was utilized to obtain the values of the arsenic concentration in the materials. Thirty-six rats were div
J. Appl. Oral Sci.. Publicado em: 29/07/2014
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6. Avaliação de fármacos fotossensíveis derivados da cloro alumínio ftalocianina no tratamento da progressão tumoral em modelo de matriz tridimensional mista / Evaluation of photosensitizers aluminum chloride phthalocyanine derivatives in the treatment of tumor progression in three-dimensional matrix.
Wound healing process can be favored by Low Level Laser Therapy, with the collagen and elastin matrix a dermic substitute described as an appropriate system in tissue engineering and in tridimensional skin systems. With this purpose, a study was elaborated using the system nanoemulsion of aluminium-chloride phthalocyanine (ClAlPc) as photosensitizer in skin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/10/2012
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7. Pré-tratamento do bagaço de cana-de-açúcar com H2SO4 diluído em reator piloto aquecido por vapor direto / Pre-treatment of sugarcane bagasse with dilute H2SO4 in pilot reactor heated by direct steam
This study aimed to evaluate how certain pretreatment conditions of sugarcane bagasse with dilute H2SO4 influence the size distribution of sugarcane bagasse, the chemical composition of solids pretreated and hemicellulosic hydrolysate, as well the enzymatic digestibility of pretreated solids. For that, previously, a sample of in natura sugarcane bagasse was
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/03/2011
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8. Comparative study of analytical methods by direct and first-derivative UV spectrophotometry for evaluation of losartan potassium in capsules
O losartano potássico é um agente anti-hipertensivo não peptídico, que exerce sua ação por bloqueio específico dos receptores da angiotensina II. Este trabalho propôs a validação e aplicação de métodos analíticos orientados ao controle de qualidade de losartano potássico 50 mg na forma farmacêutica cápsula, utilizando a espectrofotometria di
Brazilian Journal of Pharmaceutical Sciences. Publicado em: 2010-03
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9. Estudo do desempenho do processo de microfiltração tangencial com membranas cerâmicas aplicado à retenção de bactérias e redução de sólidos suspensos de uma bebida à base de açaí / Performance study of the crossflow microfiltration process with ceramic membranes applied to the bacteria retention and suspended solids reduction of the beverage based on açai
In this doctoral research, the crossflow microfiltration process utilizing ceramic membranes was investigated aiming at the bacteria retention (Escherichia coli) and reduction of suspended solids of beverage based on açai (Euterpe oleracea Mart.). The selected commercial membranes of alfa-alumina (AL IND.2O IND.3) had nominal pore sizes of 0.8 and 1.2 müm
Publicado em: 2010
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10. Neonate serum bilirubin meter using direct spectrophotometry / Analisador de bilirrubina no soro de neonatos utilizando espectrofotometria direta
A icterícia é uma manifestação caracterizada pelo amarelamento da pele e mucosas devido ao excesso de bilirrubina no sangue do paciente. Cerca de 60% dos recém nascidos (RN) manifestam a icterícia nas primeiras semanas de vida, sendo este índice muito maior em neonatos prematuros. Se não corretamente diagnosticada, a alta concentração de bilirrubin
Publicado em: 2009
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11. Color stability evaluation of aesthetic restorative materials
Color match is one of the most important characteristics of aesthetic restorative materials. Maintenance of color throughout the functional lifetime of restorations is important for the durability of treatment. This characteristic is not constant among dental materials. The purpose of this research was to assess the color stability of five aesthetic restorat
Brazilian Oral Research. Publicado em: 2008-09
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12. Pathway analysis of the main organic and inorganic constituents affecting the color of the juice in sugarcane cultivars / Análise de trilha dos principais constituintes orgânicos e inorgânicos sobre a cor do caldo em cultivares de cana-de- açúcar
Brazil is the main producer and exporter of sugar in the world. For 2008, its production is estimated to reach more than thirty million tons. One requirement for exportation of the sugar is its coloration, that must be in accordance with the International Commission for Uniform Methods in Sugar Analysis - ICUMSA. The color ICUMSA (sugar) can also be applied
Publicado em: 2008