Extraction Induced
Mostrando 1-12 de 307 artigos, teses e dissertações.
-
1. Simple Spectrophotometric Determination of Iron in Diesel Oil after Sample Preparation Employing Extraction Induced by Emulsion Breaking
This work reports the development of a simple and fast method for the spectrophotometric determination of Fe in diesel oil using the classic reaction with 1,10-phenanthroline after its extraction induced by emulsion breaking (EIEB). The extraction parameters of EIEB were optimized (concentration of HNO3 and Triton X-100® in the emulsifying solution) as well
Journal of the Brazilian Chemical Society. Publicado em: 2022
-
2. Can SARS-CoV-2 induce hematologic malignancies in predisposed individuals? A case series and review of the literature
Abstract Introduction Coronavirus disease 2019 (COVID-19) may present with extrapulmonary manifestations, including hematologic changes. Previous studies suggest that severe acute respiratory syndrome coronavirus 2 (SARS-Cov-2) can interact with the renin-angiotensin system, ultimately causing increased production of angiotensin II. By reporting the cases o
Hematology, Transfusion and Cell Therapy. Publicado em: 2022
-
3. Response surface optimization of polysaccharide extraction from Galla Chinensis and determination of its antioxidant activity in vitro
Abstract Galla Chinensis was a traditional Chinese medicine used as an ingredient in many prescriptions for the treatment of oxidant damage-associated symptoms in China. The current research on the isolation of polysaccharides from Galla Chinensis and their antioxidant activities still remain as an ongoing challenge. The purpose of this study is to develop a
Food Sci. Technol. Publicado em: 2021-03
-
4. Development of a Methodology Based on Extraction Induced by Emulsion Breaking for Copper Determination in Gasohol by Graphite Furnace Atomic Absorption Spectrometry
The development of a method based on extraction induced by emulsion breaking (EIEB) aiming copper determination in gasohol using graphite furnace atomic absorption spectrometry (GF AAS) is reported. Emulsification of the gasohol samples was carried out using nitric acid solution, (1,1,3,3-tetramethylbutyl)phenyl-polyethylene glycol surfactant (Triton X-114),
J. Braz. Chem. Soc.. Publicado em: 2021-02
-
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
-
6. RP-HPLC and LC–MS–MS determination of a bioactive artefact from Ipomoea pes-caprae extract
Abstract Solvents play important and critical role in natural product chemistry and could generate artefacts during the extraction and purification of metabolites from a biological matrix. This study aimed to correlate the chromatographic profile with biological activity of Ipomoea pes-caprae (L.) R. Br., Convolvulaceae, extracts obtained with hydroethanolic
Rev. bras. farmacogn.. Publicado em: 09/12/2019
-
7. 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
-
8. 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
-
9. 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
-
10. A valepotriate-enriched fraction from Valeriana glechomifolia Meyer inhibits leukocytes migration and nociception in formalin test in rodents
Abstract Previous pre-clinical studies demonstrated that a valepotriates enriched fraction from Valeriana glechomifolia F.G. Mey., Caprifoliaceae, was effective against lipopolysaccharide from Escherichia coli (LPS)-induced sickness behavior as well as significantly decreased the cortical expression of pro inflammatory cytokines interleukin-1β and tumor nec
Rev. bras. farmacogn.. Publicado em: 17/10/2019
-
11. Pharmacological evaluation of the hydro-alcoholic extract of Campomanesia phaea fruits in rats
Resumo Campomanesia phaea (Myrtaceae), popularmente conhecida como cambuci, é uma das várias espécies de plantas que produzem frutos comestíveis amplamente utilizados na nutrição humana. Apesar de seu consumo e potencial econômico, há poucas pesquisas científicas sobre a Campomanesia, especialmente aquelas relacionadas aos seus benefícios terapêut
Braz. J. Biol.. Publicado em: 07/10/2019
-
12. Chemical composition of propolis extract and its effects on epirubicin-induced hepatotoxicity in rats
ABSTRACT Propolis is a natural substance, produced by honeybees from the resin of various plants. The purpose of this study was to determine the chemical composition and evaluate the hepatoprotective effect of ethyl acetate extract of propolis from Tigzirt, against the toxicity induced by epirubicin which is a anticancer agent, and belongs to the family of a
Rev. bras. farmacogn.. Publicado em: 26/08/2019