Solid Phase Spectrophotometry
Mostrando 13-20 de 20 artigos, teses e dissertações.
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13. Exploração de modelagens matemáticas em determinações por espectrofotometria em fase sólida em sistemas de análise por injeção em fluxo.
A espectrofotometria em fase sólida (EFS) acoplada a sistemas de injeção em fluxo tem sido bastante explorada na determinação de várias espécies químicas em baixas concentrações. Em EFS, um suporte sólido contendo o analito imobilizado é colocado numa cela posicionada no caminho ótico, sendo as medidas realizadas in situ, integrando as etapas de
Publicado em: 2006
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14. Emprego de matriz polimérica biodegradável em dispositivos vaginais para liberação sustentada de progesterona em fêmeas bovinas: testes in vitro e in vivo / Use of biodegradable polymeric matrix, in vaginal devices, to sustained progesterone release in cows: in vitro e in vivo tests
With the increase in the number of animals inseminated by TAI (timed artificial insemination) the decrease of costs and the improvement of reproductive performance are the goals of several research groups. Progesterone devices which are majority constituted of a nylon skeleton covered with a silicone layer with P4, are used in TAI protocols. Aiming the decre
Publicado em: 2006
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15. Adsorção e dessorção de cobre em solos sob aplicação de lodo de esgoto e calda bordalesa / Adsorption and desorption of copper in soils under sewage-sludge and bordeaux mixture application
The introduction of heavy metals in soil could be effectuated in differents ways, being the applications of sewage-sludge and industrial residues the most studied of them. However, traditional agricultural practices can contribute to take metals to the soil as well, through the use of mineral fertilizers, pesticides and also organic manure.The objectives of
Publicado em: 2005
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16. Estratégias para aumento de sensibilidade em espectrofotometria UV-VIS
Spectrophotometry is one of the most widespread analytical techniques due to its simplicity, reliability, and low-cost instrumentation for both direct measurements and coupled to other techniques or processes such as chromatography, electrophoresis and flow analysis. However, the application is often limited by sensitivity. This article describes some advanc
Química Nova. Publicado em: 2004-10
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17. Avaliação da 2,2?-biquinolina na separação, preconcentração e determinação de cobre por espectrofotometria de absorção molecular em solução e em fase sólida.
The present work proposes the evaluation of the cuproine as a reagent for copper extraction, preconcentration and determination using molecular absorption spectrophotometry in solution and in solid phase.In first study, copper (I) cation reacts with cuproine in pH 4.8 forming a pink complex, stable for at least 48 hours, with absorption maximum at 545nm and
Publicado em: 2004
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18. A mass transfer model applied to the supercritical extraction with CO2 of curcumins from turmeric rhizomes (Curcuma longa L)
Increasing restrictions on the use of artificial pigments in the food industry, imposed by the international market, have increased the importance of raw materials containing natural pigments. Of those natural substances with potential applications turmeric rhizomes (Curcuma longa L), are one of the most important natural sources of yellow coloring. Three di
Brazilian Journal of Chemical Engineering. Publicado em: 2000-09
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19. Construção de uma cela de fluxo para medidas por espectrofotometria em fase sólida
A simple and low cost flow cell is proposed for measurements by solid-phase spectrophotometry employing a conventional spectrophotometer. The flow cell geometry allows the employment of a large amount of the solid support without causing both excessive attenuation of the radiation beam and increasing of the back-pressure. The adaptation of the flow cell in t
Química Nova. Publicado em: 2000-02
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20. Indirect sandwich enzyme-linked immunosorbent assay for rapid detection of Streptococcus pneumoniae type 3 antigen.
An indirect sandwich enzyme-linked immunosorbent assay for the detection of the polysaccharide antigen of type 3 pneumococcus (SSS-III) is reported. Polystyrene balls with attached anti-SSS-III antibody serve as the solid phase, and antigen is detected using an alkaline phosphatase-labeled antiglobulin conjugate. The reaction is quantitated by spectrophotome