Gcms
Mostrando 13-24 de 878 artigos, teses e dissertações.
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13. Molecular Docking in silico Analysis of Brazilian Essential Oils Against Host Targets and SARS-CoV-2 Proteins
The inhibitory activity of thirty-one sesquiterpenes identified from Brazilian essential oils (Copaifera langsdorffii Desf., Croton cajucara Benth. and Siparuna guianensis Aublet.) were analyzed by in silico molecular docking. The compounds were characterized by gas chromatography-mass spectrometry (GC-MS) and gas chromatography with flame-ionization detecti
Journal of the Brazilian Chemical Society. Publicado em: 2022
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14. Quantification of Carbon Dioxide (CO2), Methane (CH4), and Nitrous Oxide (N2O) Using Near Infrared Spectroscopy and Multivariate Calibration in High Humidity Levels
In this work we developed a promising analytical method combining Fourier transform near-infrared (FT-NIR) spectroscopic technique and first-order multivariate calibration using partial least-squares (PLS) model to simultaneously quantify the main greenhouse gases (GHG’s): methane (CH4), carbon dioxide (CO2), nitrous oxide (N2O) and water vapor (H2O). The
Journal of the Brazilian Chemical Society. Publicado em: 2022
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15. Bioacumulação comparativa de HAP e BTEX em Malapterurus electricus (Siluriformes: Malapteruridae) e seu parasita entérico, Electrotaenia malopteruri, coletado na lagoa Lekki, Lagos, Nigéria
Resumo A contaminação da lagoa Lekki por produtos químicos petrogênicos, como hidrocarbonetos aromáticos policíclicos (HAP) e benzeno, tolueno, etilbenzeno e xileno (BTEX), foi amplamente relatada. O estudo teve como objetivo investigar a bioacumulação de HAP e BTEX em Malapterurus electricus, coletados na lagoa Lekki, em Lagos, Nigéria. O BTEX foi
Braz. J. Biol.. Publicado em: 2021-12
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16. Eficácia antifúngica de extratos de folha e de semente de Moringa oleifera contra Botrytis cinerea causador da doença do molde cinza de tomate (Solanum lycopersicum L.)
Resumo As desvantagens associadas ao uso de fungicidas químicos para controlar fungos fitopatogênicos, como Botrytis cinerea, estimulam a necessidade de alternativas. Portanto, o presente estudo foi realizado para determinar o potencial antifúngico de extratos de Moringa oleifera contra B. cinerea. A análise fitoquímica usando testes químicos qualitati
Braz. J. Biol.. Publicado em: 2021-12
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17. Composição química do óleo essencial de Zhumeria majdae e seus efeitos na expressão da síndrome de abstinência de morfina e tolerância ao efeito anticonvulsivante da morfina em crises induzidas por pentilenotetrazol em camundongos
Resumo Em relação ao efeito anticonvulsivante comprovado do óleo essencial de Zhumeria majdae (ZMEO) em estudos anteriores, fomos instigados a investigar os efeitos do ZMEO em relação à tolerância aos efeitos anticonvulsivantes da morfina e da síndrome de abstinência de morfina. A tolerância ao efeito anticonvulsivante da morfina foi induzida em ca
Braz. J. Biol.. Publicado em: 2021-12
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18. The influence of cultivar and enzyme treatment on the aroma complex of apple juice
Abstract This paper aims to determine the influence of a cultivar (Golden delicious and Granny Smith) and enzyme treatments (hot and cold) on the aroma complex of clear apple juice. While the composition of aromatic components of the juice was determined by Gas Chromatography Mass Spectrometry (GC/MS) technique, a panel of 24 semi trained evaluators carried
Food Sci. Technol. Publicado em: 2021-06
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19. Porosity of CHA Zeolite Driving the Formation of Polyaromatic Coke Species in the Methanol to Olefins Reaction
The pore size of the chabazite structure is exceptionally suitable for the methanol to olefins (MTO) reaction. The reaction has an induction period required for the formation of a hydrocarbon pool (HP), usually composed of aromatic compounds of different sizes. HP is alkylated by methanol and afterward cracked, leading to the formation of olefins. Despite th
J. Braz. Chem. Soc.. Publicado em: 2021-05
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20. Thermal and Catalytic Fast Pyrolysis of Oily Extracts of Microalgae: Production of Biokerosene
Three different microalgae species, Desmodesmus sp., Nannochloropsis oculata and Halamphora coffeaeformis were grown under controlled conditions. The resulting dry biomass was characterized by TG-DTA (thermogravimetry-differential thermal analysis) and extracted with three solvents having different polarities. The extracts gross mass yields varied from 2% us
J. Braz. Chem. Soc.. Publicado em: 2021-04
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21. A new polysaccharide isolated from Dendrobium offcinale, stimulates aquaporin-3 expression in human keratinocytes
Abstract Polysaccharides are the major components of the water extract from Dendrobium officinale, which have been thoroughly studied and found to have favorable moisturizing properties on mammalian skin. However, the structures of polysaccharides on skin moisturizing properties remains unknown. The aim of this study was to extract and characterize D. offici
Food Sci. Technol. Publicado em: 2021-03
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22. Multivariate Optimization of Extraction Variables of PAH in Particulate Matter (PM10) in Indoor/Outdoor Air at Campos dos Goytacazes, Brazil
Polycyclic aromatic hydrocarbons (PAH) are products of incomplete combustion of biomass and fossil fuels, that are produced on a larger scale by anthropogenic sources. Burning sugarcane plantations can be a source of atmospheric PAH in regions where this culture predominates. Campos dos Goytacazes, Brazil, is surrounded by sugarcane crops that still use fire
J. Braz. Chem. Soc.. Publicado em: 2021-03
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23. Avaliação de risco ecológico do óleo essencial de Piper aduncum em organismos não alvo
RESUMO Uma possível alternativa ao uso de fármacos veterinários no tratamento e prevenção de doenças na piscicultura é o uso do óleo essencial de Piper aduncum. No entanto, são necessários dados ecotoxicológicos para garantir seu uso apropriado sem causar efeitos adversos a organismos não alvo. Esta informação é relevante, pois esse óleo esse
Acta Amaz.. Publicado em: 2021-03
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24. SIMPLE AND FAST DETERMINATION FOR GAMMA-HYDROXYBUTYRATE (GHB) IN URINE SAMPLE BY LLE AND GC-MS
Gamma-hydroxybutyrate (GHB) is a depressant of the central nervous system able to promote disinhibition, anterograde amnesia and its use is related to Drug-Facilitated Crimes (DFC). Urine is the biological matrix of choice for toxicological analysis in victims of rape and/or theft in suspected victims of DFC. The aim of this work was the development of a sim
Quím. Nova. Publicado em: 2021-02