Sodium Tetraborate
Mostrando 1-10 de 10 artigos, teses e dissertações.
-
1. Optimization of an Electrolyte System for the Simultaneous Separation of Nelfinavir Mesylate and Two Impurities by Micellar Electrokinetic Chromatography
A methodology for the simultaneous determination of nelfinavir mesylate and the impurities 3-hydroxy-2-methylbenzoic acid and (2R,3R)-4-((3S,4aS,8aS)-3-(tert-butylcarbamoyl) octahydroisoquinolin-2(1H)-yl)-3-hydroxy-1-(phenylthio)butan-2-aminium benzoate by micellar electrokinetic chromatography, with an analysis time of 25 min, was proposed. An electrolyte c
J. Braz. Chem. Soc.. Publicado em: 2015-05
-
2. FORMULAÇÕES MATRICIAIS À BASE DE QUITOSANA: estudos de adsorção e liberação de corantes. / MATRIX FORMULATIONS BASED CHITOSAN: adsorption studies and release of dyes.
Spheres of chitosan were prepared and crosslinked with sodium tetraborate and the epoxy resin PY-340 to obtain the hybrid materials QUIT-BORAX and QUIT-EPOXI, respectively. The hybrid QUIT-EPOXI was reacted with sodium tetraborate to obtain the hybrid QUIT-EPOXI-BORAX. The spheres of raw chitosan and the new hybrid materials were characterized by determining
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/01/2012
-
3. Determination of cetirizine in tablets and compounded capsules: comparative study between CE and HPLC
A capillary electrophoresis (CE) method was developed and validated for determination of cetirizine dihydrochloride in tablets and compounded capsules. The electrophoretic separation was performed in an uncoated fused-silica capillary (40 cm x 50 μm i.d.) using 20 mmol L-1 sodium tetraborate buffer (pH 9.3) as background electrolyte, a hydrodinamic sample i
Química Nova. Publicado em: 2010
-
4. Desenvolvimento e otimização de metodologia para análise de edulcorantes por Eletroforese Capilar
An innovative methodology was developed to simultaneously separate and quantify aspartame, cyclamate, saccharin and acesulfame-K through capillary electrophoresis with direct and indirect detection of UV, analysis time of roughly 6 minutes and with no sample derivatization. As the cyclamate has low absorptivity we used a system of electrolyte added to a chro
Publicado em: 2010
-
5. Estudos fundamentais e aplicações envolvendo hormônios esteróides por meio de eletroforese capilar / Fundamental study and applications involving steroids hormones by capillary electrophoresis
In the first chapter of this work, the classification and importance of the sexual steroids for maintenance of the life human is presented. The next chapter presents general aspects on capillary electrophoresis, such as operation, terminology and considerations on the electroosmotic flow and electroforetic mobility. The third chapter shows a study of interac
Publicado em: 2008
-
6. Aditivação de pastas geopoliméricas com tetraborato de sódio e látex não iônico para cimentação de Poços de Petróleo
The development of activities in the oil and gas sector has been promoting the search for materials more adequate to oilwell cementing operation. In the state of Rio Grande do Norte, the cement sheath integrity tend to fail during steam injection operation which is necessary to increase oil recovery in reservoir with heavy oil. Geopolymer is a material that
Publicado em: 2007
-
7. Avaliação de contaminantes inorgânicos e orgânicos em álcool combustível utilizando eletroforese capilar
This work reports the analysis of inorganic and organic contaminants in alcohol fuel samples using capillary electrophoresis. Chloride and sulfate were analyzed in nitrate/ monochloroacetic acid at 10 mmol L-1 concentration each under indirect UV detection (210 nm). The analysis of aldehydes is based on the 216 nm detection of 3-methyl-2-benzothiazoline hydr
Química Nova. Publicado em: 2006-02
-
8. Determinação dos elementos do grupo da platina após fusão coletora com sulfeto de nível
The nickel sulfide fire assay was used to separate and to concentrate the platinum group elements (PGE) and gold (Au) from geological matrices, seeking their analytic determination. The fire assay was accomplished by fusing 10 g of sodium carbonate, 20 g of sodium tetraborate, 1 g of nickel, 0,75 g of sulfur and 10 to 20 g of sample, thoroughly mixed. After
Publicado em: 1999
-
9. Near-Infrared Analysis of Hydrogen-Bonding in Glass- and Rubber-State Amorphous Saccharide Solids
Near-infrared (NIR) spectroscopic analysis of noncrystalline polyols and saccharides (e.g., glycerol, sorbitol, maltitol, glucose, sucrose, maltose) was performed at different temperatures (30–80°C) to elucidate the effect of glass transition on molecular interaction. Transmission NIR spectra (4,000–12,000 cm−1) of the liquids and cooled-melt amorpho
Springer US.
-
10. Immunochemical Analysis of Serologically Active Lipids of Mycoplasma pneumoniae1
The major complement-fixing antigen of Mycoplasma pneumoniae is found in the lipid fraction of the organism. When the lipids of M. pneumoniae were fractionated by column chromatography on silicic acid, serological activity against both rabbit and human immune sera was found in two fractions, B and D. Fraction B, eluted with chloroform–methanol (9:1), was a