Sample Pretreatment
Mostrando 1-12 de 105 artigos, teses e dissertações.
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1. FAST DETERMINATION OF THE SULFUR SPECIES IN SOLID PHASE SYSTEMS BY A TPO-IR METHOD
Qualitative and quantitative assessment of total sulfur and sulfur species in solid phase is necessarily important for development of effective desulfurization methods, reduction of environmental pollution, and prevention of catalyst poisoned. In this work, TPO-IR (Temperature Programmed Oxidation- Infrared) method was used for rapid determination of sulfur
Quím. Nova. Publicado em: 2021-01
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2. Rapid Determination of Vitamins D2 and D3 in Dairy Products by High-Performance Liquid Chromatography after Solid Phase Extraction Based on Polystyrene/Polypyrrole Composite Nanofibers
The detection of vitamin D in complex samples is challenging because of the instability of vitamin D in sample preparation. To resolve this problem, packed-fiber solid-phase extraction (PFSPE) has been successfully developed for the pre-treatment of samples containing vitamin D2 (D2) and vitamin D3 (D3) in dairy products. Based on PFSPE, vitamin D could avoi
J. Braz. Chem. Soc.. Publicado em: 2020-06
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3. Optimization of New Sample Preparation Technique for the Determination of Methadone and Codeine in Plasma Sample by GC-FID
A continuous sample drop flow microextraction (CSDF-ME) technique was modified for the pretreatment of plasma samples in the determination of methadone and codeine. The limit of detection and linear range for methadone were 15.0 µg L-1 and 0.1-10.0 mg L-1, respectively. The detection limit and linear range for codeine were 25.0 µg L-1 and 0.2-15.0 mg L-1,
J. Braz. Chem. Soc.. Publicado em: 2020-03
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4. Characterization of Nanocellulose Obtained from Cereus Forbesii (a South American cactus)
Crystalline cellulose nanofibers are obtained from the bark of Cereus Forbesii, a cactus native to the arid areas of South America. The obtaining of cellulose nanofibers was carried out in several steps: pretreatment of the raw material, elimination of hemicellulose and lignin to obtain cellulose, and an acid hydrolysis of cellulose to obtain crystalline cel
Mat. Res.. Publicado em: 20/01/2020
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5. Emotion regulation as the mediator of reductions in anxiety and depression in the Unified Protocol (UP) for transdiagnostic treatment of emotional disorders: double-blind randomized clinical trial
Resumo Objetivo: É importante, na avaliação da eficácia de tratamentos, examinar como a intervenção tem efeito e identificar suas consequências. O presente estudo investiga o papel da regulação emocional enquanto mediadora de desfechos do tratamento que emprega o Protocolo Unificado (PU) para o tratamento transdiagnóstico de transtornos psicológi
Trends Psychiatry Psychother.. Publicado em: 17/10/2019
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6. Ultrasonic pretreatment of carrot slices: Effects of sonication source on drying kinetics and product quality
Abstract: In this study effects of ultrasonic pretreatment with different sonication sources on drying behavior of carrot slices were evaluated. Fresh carrot slices were pretreated with ultrasonic probe at 65, 75 and 85 W or ultrasonic bath at 10, 20 and 30°C for 3, 5 and 10 min before air drying. Water gain % and solid loss % of pretreated samples were cal
An. Acad. Bras. Ciênc.. Publicado em: 30/09/2019
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7. Relationship between skeletal Class II and Class III malocclusions with vertical skeletal pattern
RESUMO Objetivo: o objetivo do presente estudo foi estabelecer a relação entre os padrões esqueléticos sagitais e verticais, e avaliar quais variáveis esqueléticas podem influenciar na chance de desenvolver uma má oclusão de Classe II ou de Classe III esquelética. Métodos: foi feito um estudo transversal, cuja amostra incluiu radiografias cefalo
Dental Press J. Orthod.. Publicado em: 05/09/2019
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8. Primary bacillary resistance in multidrug-resistant tuberculosis and predictive factors associated with cure at a referral center in São Paulo, Brazil
RESUMO Objetivo: Identificar resistência transmitida ou primária entre casos de tuberculose multidrogarresistente e fatores preditivos associados à cura da tuberculose multidrogarresistente após o primeiro tratamento. Método: Estudo descritivo de uma coorte de 2006 a 2010, em uma unidade de referência em tuberculose no estado de São Paulo, Brasil. O
J. bras. pneumol.. Publicado em: 11/03/2019
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9. The association between palatal rugae pattern and dental malocclusion
RESUMO Introdução: as rugas palatinas completam seu desenvolvimento ainda no início da vida intrauterina, enquanto as más oclusões dentárias na dentição permanente se estabelecem após vários anos de vida pós-natal. Objetivos: o presente estudo foi planejado para determinar se há associação entre o padrão das rugas palatinas e as más oclus
Dental Press J. Orthod.. Publicado em: 2019-02
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10. Cognitive-behavioral group therapy for intermittent explosive disorder: description and preliminary analysis
Objectives: To evaluate the efficacy of a group therapy based on cognitive-behavioral techniques customized for intermittent explosive disorder (IED). The current report presents the preliminary results of a clinical trial comparing pre- and post-intervention scores in different anger dimensions. Methods: The studied sample consisted of 84 treatment-seekin
Rev. Bras. Psiquiatr.. Publicado em: 26/03/2018
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11. Solvothermal Reduction of Graphite Oxide Using Alcohols
In the present work, we use either ethanol or ethylene glycol as reducing agents through the solvothermal method for graphite oxide reduction. A sulfuric acid treatment before the reduction process was also applied to evaluate its influence on the epoxy group ring-opening reaction. Reduced graphene oxide (RGO) samples were obtained with morphology like crump
Mat. Res.. Publicado em: 18/12/2017
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12. Quantificação de alquilbenzeno linear sulfonato em estação de tratamento de efluentes e rios por cromatografia líquida de alta eficiência e extração em fase sólida
The procedures to implement a chromatographic method for the quantification of linear alkyl benzene sulfonate (LAS) in the influent, effluent and sludge of a wastewater treatment plant (WWTP), and in river water and sediment, are described and evaluated. The columns octylsilane (C8) and octadecylsilane (C18) for high performance liquid chromatography were ev
Quím. Nova. Publicado em: 2017-04