Sample Preparation
Mostrando 25-36 de 705 artigos, teses e dissertações.
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25. OTIMIZAÇÃO E VALIDAÇÃO DE MÉTODO BASEADO EM QuEChERS PARA DETERMINAÇÃO DE CONSERVANTES EM COSMÉTICOS POR HPLC-DAD
Parabens are widely used as preservatives in the last decades. Others preservatives such as 2-phenoxyethanol, which in addition to his good antimicrobial activity, has low allergenic potential as well others properties of interest to the cosmetic industry. In this work was developed a method for determination of methylparaben (MP), propylparaben (PP) and 2-p
Quím. Nova. Publicado em: 2020-02
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26. CATALYST PREPARATION METHODS TO REDUCE CONTAMINANTS IN A HIGH-YIELD PURIFICATION PROCESS OF MULTIWALLED CARBON NANOTUBES
Abstract CoMo/MgO catalysts with low loading of cobalt and molybdenum were prepared by incipient wetness impregnation and the sol-gel method for high yield production of carbon nanotubes (CNT). A detailed characterization of the catalysts, as-produced CNT and purified CNT, indicated a relationship between carbon nanotube properties, synthesis and purificatio
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
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27. Comunicação de Más Notícias: Ferramenta Essencial na Graduação Médica
RESUMO A comunicação é um processo dinâmico e aberto. No âmbito da saúde, engloba desde a transmissão de mensagens, até a obtenção de informações. “Má notícia” pode ser considerada como toda a informação que envolva uma mudança drástica e negativa na vida da pessoa e na perspectiva do futuro. Conceder más notícias ao paciente inclui d
Rev. bras. educ. med.. Publicado em: 13/01/2020
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28. DEVELOPING NEAR INFRARED SPECTROSCOPIC MODELS FOR PREDICTING DENSITY OF Eucalyptus WOOD BASED ON INDIRECT MEASUREMENT
ABSTRACT The objective of this study was to establish multivariate models for the prediction of wood basic density with reference to the values of average density of trees and near infrared (NIR) spectra measured in the breast height. The wood basic density of 39 Eucalyptus clones was determined in the laboratory by means of the mean longitudinal positions o
CERNE. Publicado em: 20/12/2019
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29. Sucrose-free milk chocolate manufacture using bulking agents and a non-caloric sweetener
Abstract Sucrose is important in the production of chocolates because it contributes to its texture and sensory acceptance. The aim was to evaluate the effect of adding bulking agents and a non-caloric sweetener in the preparation of a sucrose-free milk chocolate. One control sample (with sucrose) and 11 treatments were taken varying the ratio between bulkin
Food Sci. Technol. Publicado em: 13/12/2019
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30. Preconception health behaviors among women with planned pregnancies
RESUMO Objetivo: Analisar os determinantes da realização do preparo pré-concepcional entre mulheres com gravidez planejada. Método: Estudo transversal com amostra probabilística de 264 mulheres de 18 a 49 anos de idade com gravidez atual ou anterior planejada, usuárias de dois Centros de Saúde Escola da cidade de São Paulo. Análise conduzida por m
Rev. Bras. Enferm.. Publicado em: 13/12/2019
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31. Translation and cross-cultural adaptation of the Brazilian version of the Reading Anxiety Scale: Short version
Resumo A ansiedade de leitura refere-se a uma reação emocional negativa em relação ao processo de leitura, que motiva o indivíduo a evitar tais atividades. Até o momento, não existem instrumentos para avaliar esse construto na população infantil brasileira. Este estudo apresenta a adaptação cultural da Reading Anxiety Scale na versão breve, bem c
Estud. psicol. (Campinas). Publicado em: 05/12/2019
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32. Perfil Multicêntrico do Acadêmico de Medicina e suas Perspectivas sobre o Ensino da Oftalmologia
Resumo Objetivo: Analisar qualitativa e quantitativamente o perfil do aluno de Medicina que cursou a disciplina de Oftalmologia, correlacionando aspectos do seu ensino em conhecimentos básicos e perspectivas discente sobre a sua formação. Métodos: Foi realizado um estudo transversal descritivo do tipo inquérito, em 242 alunos de 12 estados brasileiro
Rev. bras.oftalmol.. Publicado em: 04/11/2019
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33. Halogen Determination in Polymeric Waste of Electrical and Electronic Equipment: Overcoming Limitations in Sample Preparation
Sample preparation of polymers for halogen determination requires special attention because they are difficult to bring into solution and due to the risk of analyte losses when using acid digestion. A method using microwave-induced combustion (MIC) was optimized for accurate determination of halogens in polymeric parts obtained in waste of electrical and ele
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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34. Bioaccessibility of Zinc from Yogurt and Determination of Total Concentration Using Slurry Sampling and Flame Atomic Absorption Spectrometry
The bioaccessibility of Zn during in vitro gastrointestinal digestion from yogurt was investigated. In addition, the methodologies of sample preparation (dry and wet digestion, and slurry sampling) for the determination of total concentration of Zn in yogurt by flame atomic absorption spectrometry were also compared in this work. In comparison with digestion
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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35. Chlorine and Fluorine Determination in Eye-Pencil: Development of an Eco-Friendly Sample Preparation Method for Ion Chromatography Analysis
In this paper, a feasible method was proposed for the chlorine and fluorine determination in eye-pencil samples using ion chromatography (IC). The microwave-induced combustion (MIC) was used to digest up to 200 mg of a sample, with 50 mg of microcrystalline cellulose as a combustion aid and only water for analytes absorption. Cl and F recoveries were 105 ±
J. Braz. Chem. Soc.. Publicado em: 21/10/2019
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36. Integrated Chemometric Approach to Optimize Sample Preparation for Detecting Metabolic Changes Provoked by Abiotic Stress in Coffea arabica L. Leaf Fingerprints
The effects of water-deficit stress on irrigated and unirrigated field plants of Coffea arabica L. genotype IAPAR 59 were investigated. Plant extracts were obtained following an ethanol-dichloromethane-hexane statistical mixture design. Proton nuclear magnetic resonance (1H NMR) fingerprints of the extracts were discriminated using factor analysis (FA) and h
J. Braz. Chem. Soc.. Publicado em: 21/10/2019