Stir Bar
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. Thermal Dissipation Effect on Temperature-controlled Friction Stir Welding
Resumo Durante a Soldagem por Fricção linear (FSW) de geometrias complexas, a dissipação térmica, induzida por características geométricas ou pelo ambiente circundante, desempenha um papel importante na qualidade final da junta. Para garantir uma qualidade consistente em condições diferentes é necessário a adaptacão de parâmetros durante o proce
Soldag. insp.. Publicado em: 25/11/2019
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2. SBSE(EG-Silicone)-UFLC-MS/MS and HPLC-Flu Analysis of Norharman in Passiflora edulis Rinds
Previous studies on Passiflora edulis (sour passion fruit) rinds reported some biological activities and there is a growing interest on rinds flour as a possible functional food, but its alkaloid composition was not detailed investigated. This work reports on for the first time in the literature the identification of norharman in P. edulis rinds, by using st
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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3. Aroma characteristics and volatile compounds of distilled Crystal grape spirits of different alcohol concentrations: wine sprits in the Shangri-La region of China
Abstract Aroma composition is critical to the quality of distilled spirits while the alcohol concentration could have a great effect on the variety and content of aromatic substances. In order to clarify the effect of alcohol concentration on the formation of the aroma composition, volatile compounds in Crystal distilled grape spirits with different alcohol
Food Sci. Technol. Publicado em: 30/07/2018
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4. Targeted-Analysis of β-Carboline Alkaloids in Passionfruit (“Maracujá”) by SBSE(PDMS)-LC/Flu and UHPLC-MS
Samples of pulp and seeds of sour (P. edulis) and sweet (P. alata) passionfruit were subjected to targeted analysis to identify β-carboline alkaloids, using combined UHPLC-MS (ultrahigh performance liquid chromatography-mass spectrometry) and SBSE(PDMS) (stir bar sorption extraction using polydimethylsiloxane as stationary phase) for sample preconcentration
J. Braz. Chem. Soc.. Publicado em: 2018-04
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5. Ibuprofen, Carbamazepine and β-Estradiol Determination Using Thin-Film Microextraction and Gas Chromatography-Mass Spectrometry
The use of thin-film microextraction for the extraction of selected pharmaceutical compounds followed by gas chromatography-mass spectrometry detection was evaluated. A segment of polysiloxanes polymer sheet was used as low cost, single use, disposable extraction phase, while Milli-Q water spiked at 20 µg L−1 with the analytes was used for the optimizatio
J. Braz. Chem. Soc.. Publicado em: 2016-10
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6. Aromatic profiles of young wines from berries at different heights on grapevines
Abstract The differences among young wines from berries at 3 heights (fruit-zone 1 (FZ1): 140-200 cm above the ground; FZ2: 80-140 cm; FZ3: 20-80 cm) on Vitis vinifera L.cv Merlot and Chardonnay were assessed to evaluate the influence of berry-heights on the final wine quality. Stir bar sorptive extraction coupled with gas chromatography–mass spectrometry
Food Sci. Technol. Publicado em: 30/06/2016
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7. Screening of By-Products of Esfenvalerate in Aqueous Medium Using SBSE Probe Desorption GC-IT-MS Technique
The pyrethroids, their metabolites and by-products have been recognized as toxic to environment and human health. Despite several studies about esfenvalerate toxicity and its detection in water and sediments, information about its degradation products is still scanty. In this work, esfenvalerate degradation products were obtained by chemical oxidation with h
J. Braz. Chem. Soc.. Publicado em: 2015-09
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8. Stir bar-sorptive extraction, solid phase extraction and liquid-liquid extraction for levetiracetam determination in human plasma: comparing recovery rates
Levetiracetam, fármaco antiepiléptico com perfil farmacocinético favorável, tem sido cada vez mais utilizado na prática clínica, embora informações sobre seu metabolismo e disposição cinética ainda estejam sendo geradas. Um método simples, robusto e rápido de extração líquido-líquido seguido por análise por cromatografia líquida de alta
Braz. J. Pharm. Sci.. Publicado em: 2015-06
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9. Quantification of harman alkaloids in sour passion fruit pulp and seeds by a novel dual SBSE-LC/Flu (stir bar sorptive extraction-liquid chromatography with fluorescence detector) method
Este trabalho descreve um método para quantificação dos alcaloides harmana e harmina na polpa e nas sementes dos frutos de maracujá azedo (Passiflora edulis f. flavicarpa O. Degener, Passifloraceae), por extração dual por sorção com barra magnética e cromatografia líquida de alta eficiência com detecção por fluorescência (SBSE-LC/Flu dual). Os
J. Braz. Chem. Soc.. Publicado em: 2014-08
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10. Análise dos produtos de degradação do esfenvalerato por SBSE/CLAE-UV/DAD utilizando planejamento fatorial fracionário
A simple procedure based on stir bar sorptive extraction and high-performance liquid chromatography-ultraviolet/photodiode array detection (SBSE/LC-UV/PAD) to determine intermediates and by-products of esfenvalerate is described. The influence of organic modifier, ionic strength, extraction time, temperature and pH were simultaneously evaluated by using a fa
Quím. Nova. Publicado em: 2014-06
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11. Assessing stir bar sorptive extraction and microextraction by packed sorbent for determination of selective serotonin reuptake inhibitor antidepressants in plasma sample by non-aqueous capillary electrophoresis
Duas técnicas analíticas baseadas no equilíbrio de partição, extração sortiva em barra de agitação (SBSE) e microextração por sorvente empacotado (MEPS) foram avaliadas para a determinação de antidepressivos inibidores seletivos da recaptação de serotonina (SSRI): fluoxetina, sertralina, citalopram e paroxetina, em amostra de plasma por eletro
J. Braz. Chem. Soc.. Publicado em: 2013-10
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12. Desenvolvimento e aplicação de técnicas miniaturizadas de preparo de amostra na determinação de fármacos no ambiente / Development and application of microextraction sample preparation techniques to determine pharmaceutical drugs in the environment
The occurrence of pharmaceutical drugs in the environment is a worldwide problem caused by the genotoxicity and ecotoxicity activities of those compounds. Water is one of most used natural resource in human activities which explain the presence of emerging contaminants. Those compounds affect not only humans but also aquatic animals that spend the whole life
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2012