Processes Of Extraction
Mostrando 1-12 de 286 artigos, teses e dissertações.
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1. What is new in non-chromatographic flavonoid purification?
Flavonoids are metabolites occurring in all plant tissues and present different biological activities. They occur in a mixture of similar polarity with laborious separation and purification processes, usually furnishing low yields. Semi-preparative chromatographic methods are universally employed procedures for their isolation. This paper discusses the state
Química Nova. Publicado em: 2022
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2. How Much do the Environmental Conditions Interfere with the Essential Oils of Eugenia spp. L. (Myrtaceae)?
Eugenia is the largest neotropical genus in the Myrtaceae family. The genus has a wide geographical distribution, occurring from Mexico to Argentina. Eugenia species are rich in essential oils. Essential oils have applications in perfumery, cosmetics, food, pesticides and medicines. Several factors can influence the chemical composition and yield of essentia
Journal of the Brazilian Chemical Society. Publicado em: 2022
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3. Innovative gas chromatographic determination of formaldehyde by miniaturized extraction and on-fiber derivatization, via SPME and SPME Arrow
Formaldehyde (FA) is a carbonyl compound, ubiquitous in the environment and among the most widespread pollutants: it has exhibited toxic properties and is classified as a human carcinogen. FA is released from several sources, both temporary (e.g., combustion processes) and permanent (e.g., building products). This work proposes an innovative fully-automated
Química Nova. Publicado em: 2022
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4. Zeolite-SPION Nanocomposite for Ammonium and Heavy Metals Removal from Wastewater
Minimizing the emission of industrial effluents and realizing the recovery/extraction of key elements such as the rare earths from low concentration solutions, or during water decontamination processes, are some of the biggest challenges of modern society. Accordingly, the preparation and characterization of a low cost recyclable and reusable superparamagnet
J. Braz. Chem. Soc.. Publicado em: 2020-11
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5. Variability of the Volatile Organic Compounds of Achillea millefolium L. According to the Collection Time, Type of Polyethylene Packaging and Storage Period
The collection time could be an important target for optimizing technological processes in obtaining essential oils of interest to agribusiness. The objective of this study was to distinguish the time for the collecting of Achillea millefolium L. leaves, which provides the highest yield and quality of the essential oil. Also, identify the type of polyethylen
J. Braz. Chem. Soc.. Publicado em: 2020-05
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6. APROVEITAMENTO DE PRECURSORES LIGNOCELULÓSICOS PARA PRODUÇÃO DE ACETATO DE CELULOSE
The feasibility of obtaining cellulose acetate from lignocellulosic precursors is of great interest from the environmental, economic and technological points of view. Herein, sugarcane bagasse and vegetable sponge (Luffa cylindrica ) were used as precursors to produce cellulose using the organosolv extraction procedure. From the extracted celluloses, the pro
Quím. Nova. Publicado em: 2020-03
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7. Evaluation of Aqueous Coffee Husks Extracts as a Corrosion Inhibitor of 1020 Carbon Steel in 1 mol L-1 HCl Solution
Corrosive processes in acidic medium reduce the performance and durability of metallic materials, causing problems to several industries. Corrosion inhibitors are commonly used to decrease these effects. As these inhibitors must be ecologically friendly currently, this work evaluated the anticorrosive effect of natural extracts of coffee husks (Coffea arabic
Mat. Res.. Publicado em: 09/12/2019
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8. Influence of high-frequency microwave radiation on montmorillonite structure parameters
Resumo A influência da radiação micro-ondas nas alterações estruturais das partículas de montmorilonita foi estudada em uma amostra de argila montmorilonítica. Processos de longo alcance em múltiplas escalas foram induzidos nos aluminossilicatos naturais por radiação de micro-ondas de baixa e média potência (2,45 Hz, 750 W, 10 min). Amostras em p
Cerâmica. Publicado em: 14/11/2019
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9. Germination and survival of Aechmea gamosepala on different substrates
Resumo O Estado do Paraná é uma das regiões brasileiras de maior incidência do extrativismo de bromélias, entre os fatores para a ocorrência desta situação, destaca-se a grande procura desta espécie como planta ornamental e o fácil acesso às florestas, a existência de poucos viveiros de cultivo e dificuldades dos produtores nos processos de culti
Ornam. Hortic.. Publicado em: 28/10/2019
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10. Contribuições dos aplicativos móveis para a prática do aleitamento materno: revisão integrativa
Resumo Objetivo Identificar as contribuições dos aplicativos móveis para a prática do aleitamento materno. Métodos Revisão integrativa da literatura, realizada nas bases de dados CINAHL, BDENF, Medline/PubMed, Scopus, LILACS, Web of Science e nas bibliotecas virtuais Cocharane e Scielo, para responder a questão norteadora: Quais as contribuições
Acta paul. enferm.. Publicado em: 10/10/2019
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11. Square-Wave Voltammetry Determination of Ciprofloxacin in Pharmaceutical Formulations and Milk Using a Reduced Graphene Oxide Sensor
In this paper, a simple, sensitive and precise electroanalytical method was developed using a chemically-reduced graphene-oxide (CRGO)-modified glassy carbon electrode and square wave voltammetry (SWV) for determination of ciprofloxacin in pharmaceutical formulations (tablets) and milk samples. Advantages of this sensor include a potential displacement of 10
J. Braz. Chem. Soc.. Publicado em: 16/09/2019
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12. Territorial governance and social innovation in regional development processes in mining territories: a theoretic model under construction
Resumo Há uma grave contradição entre os apregoados benefícios econômicos gerados para as localidades onde se instala e onde subsiste historicamente a indústria extrativa mineral e os resultados registrados em estudos, que apontam sérios problemas e consequências negativas decorrentes da sua questionável forma de gestão e relacionamento com o ambie
Cad. EBAPE.BR. Publicado em: 22/08/2019