High Pressure Gas Chromatography
Mostrando 1-12 de 62 artigos, teses e dissertações.
-
1. Study of the Effect of Inhibitors Solutions on the Chemical Composition of Waxes by Rheology Tests and High Resolution Mass Spectrometry
Wax deposit is of a great concern in the petroleum industry and causes partial or total blockage of the pipelines. In this work, four Brazilian crude oils (P1-P4) and five inhibitors solutions (I1-I5) were used associating rheology results to understand, at a molecular level, the characteristics of the saturated fractions by high-resolution mass spectrometry
J. Braz. Chem. Soc.. Publicado em: 2020-04
-
2. APCI(+)FT-ICR MS Analysis of Hydrocarbons Using Isooctane as Ionizing Reagent - A Comparison with HTGC-FID, GC×GC-MS and NMR
Hydrocarbons present in saturated fractions of crude oils can be assessed by atmospheric pressure chemical ionization (APCI) using small hydrocarbons as ionizing reagents in a Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS). In this work, five paraffin standards of different average molar mass distributions (Mw) were easily ionized by
J. Braz. Chem. Soc.. Publicado em: 08/04/2019
-
3. Appliance of a high pressure semi-batch reactor: supercritical transesterification of soybean oil using methanol
Abstract This work presents the results of a supercritical transesterification process of soybean oil using methanol, performed in a laboratory high pressure semi-batch reactor. A full description of the equipment and a standard operating procedure are also provided. Since fossil fuels are not renewable, biofuels such biodiesel, have gained attention over t
Food Sci. Technol. Publicado em: 31/01/2019
-
4. Volatile metabolites produced from agro-industrial wastes by Na-alginate entrapped Kluyveromyces marxianus
Abstract The aim of this study was to evaluate the effects of alginate entrapment on fermentation metabolites of Kluyveromyces marxianus grown in agrowastes that served as the liquid culture media. K. marxianus cells entrapped in Na-alginate were prepared using the traditional liquid-droplet-forming method. Whey and pomaces from processed tomatoes, peppers,
Braz. J. Microbiol.. Publicado em: 2016-12
-
5. FASES ESTACIONÁRIAS DE LÍQUIDOS IÔNICOS EM CROMATOGRAFIA GASOSA: FUNDAMENTOS, AVANÇOS RECENTES E PERSPECTIVAS
Since their original discovery in 1914, ionic liquids (IL) have been widely examined and explored in chemistry due to their unique physical and chemical properties. Ionic liquids are collectively known as organic salts and have melting points of 100 °C or under. The molten salts most employed in analytical chemistry, including gas chromatography (GC), consi
Quím. Nova. Publicado em: 2016-01
-
6. Desenvolvimento, avaliação e aplicação de um sistema de cromatografia gasosa de alta pressão / Development, implementation and evaluation of a system of high pressure gas chromatography
A cromatografia é uma técnica de separação cuja classificação se dá por meio do estado físico da fase móvel (líquido, gasoso, supercrítico, entre outros). Dentre as técnicas cromatográficas mais utilizadas e cujo conhecimento é bastante conhecido está a cromatografia gasosa. Embora esta técnica tenha sido bastante estudada existem ainda algum
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2012
-
7. Isoflurano : desenvolvimento de um método analítico empregando microextração em fase sólida, incorporação em nanoemulsões e avaliação biológica das nanoemulsões
The aims of this work were to develop and validate an analytical method using solidphase microextraction (SPME) to detect and quantify isoflurane (ISO) inhalation liquid and loaded in intravenous nanoemulsions, and also evaluate the biological effect of the formulations. ISO detection was made by gas chromatography with flame ionization detector (GC/FID). Th
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010
-
8. Avaliação de catalisadores a base de carbeto e nitreto de molibdênio na obtenção de lactitol via hidrogenação da lactose / Avaliação de catalisadores a base de carbeto e nitreto de molibdênio na obtenção de lactitol via hidrogenação da lactose
Seeking a greater appreciation of cheese whey was developed to process the hydrogenation of lactose for the production of lactitol, a polyol with high added value, using the catalyst Ni / activated carbon (15% and 20% nickel), the nitride Mo2N, the bimetallic carbide Ni-Mo/ activated carbon and carbide Mo2C. After synthesis, the prepared catalysts were analy
Publicado em: 2010
-
9. Altenative analytical methods to quality evaluation of forages used in animal nutrition / Métodos analíticos alternativos para avaliação da qualidade de forrageiras utilizadas na nutrição animal
Alternative methods were developed for some determinations performed in routine by animal nutrition laboratories, in order to increase laboratory efficiency and reduce costs maintaining analytical quality. In the first step, a multicomutation point to point potentiometric titration system to total acid in silage extracts with the use of a PVC (tridodecilamin
Publicado em: 2007
-
10. Caracterização química de extratos de Ocimum basilicum L. obtidos através de extração com CO2 a altas pressões
This work reports extraction yield and chemical characterization of the extracts obtained by high-pressure CO2 extraction of a cultivar of Ocimum basilicum L. The experiments were performed in the temperature range of 20 to 50 °C, from 100 to 250 atm of pressure. Chemical analyses were carried out by gas chromatography coupled to mass spectrometry, permitti
Química Nova. Publicado em: 2006-12
-
11. Análise bioquímica e equilíbrio ácido-base em Biomphalaria glabrata (Say, 1818), hospedeiro intermediário do Schistosoma mansoni (Sambon, 1907), sob a exposição ao Stryphnodendron polyphyllum (Martius, 1837), planta moluscicida do Cerrado brasileiro.
The state of Goiás represents a high risk to schistosomiasis stablishment area The presence of the intermediate host Biomphalaria sp added to high migration levels of people from endemic regions of the country are evidences that favour the installation of this disease life cycle In this state of Goiás there are reports of high parasitary intensity and even
Publicado em: 2006
-
12. Fibras lignocelulósicas como agente de reforço de compósitos de matriz fenólica e lignofenólica / Lignocellulosic fibers as reinforcing agents in lignophenolic and phenolic matrix composites
In this work, lignocellulosic fibers from different sources (banana tree and coconut) were used as reinforcing agents in the preparation of phenolic and lignophenolic matrix composites. The phenol used in the matrix formulation was substituted both partially and totally by lignin, extracted from sugarcane bagasse by organosolv process, in the preparation of
Publicado em: 2006