1000 resultados para coluna de imunoafinidade
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O interesse pelo estudo fitoquímico e biológico das espécies pertencentes à Aristolochiaceae é devido ao vasto uso desta na medicina tradicional e homeopática. Muitas das espécies pertencentes ao gênero Aristolochia têm apresentado atividades diversas como antiinflamatórias, sedativas, diuréticas e abortivas. O presente trabalho descreve o isolamento, a identificação e a elucidação estrutural dos constituintes químicos da Aristolochia giberti, utilizando métodos de partição e cromatográficos. O extrato acetônico de folhas da espécie foi fracionado por cromatografia em coluna de sílica gel, sendo as frações resultantes analisadas por cromatografia em camada delgada comparativa e posteriormente por métodos espectrométricos (IV, UV, EM, RMN de 1 H e de 13 C) e análise elementar (C, H, N e S), identificando assim um total de cinco substâncias: ácido copálico, ácido ent-labdan-8-ol-15-óico, a lignana kusunoquinina, e os dois epímeros da cubebina. Da mesma forma, o extrato acetônico de raízes foi submetido ao mesmo tipo de fracionamento e às mesmas análises utilizadas no acetônico de folhas, resultando na identificação de quatro substâncias: ácido 13,14-dihidrocolavênico (composto até então não obtido da espécie A. giberti), os dois epímeros da cubebina e a kusunoquinina
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Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV
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Studies regarding the quality and quantity of water have become more and more important because of the increasing negative environmental impacts occurred and their scarcity increase as well. At the Center of Tropical Fish Research (Centro de Pesquisas de Peixes Tropicais - CEPTAlIBAMA) located in the city of Pirassununga, SP, there is a dam named Represa Velha which supplies 128 tanks that are fish hatcheries. This dam takes in part of the Barrinha stream micro-basin where it has been observed strong impacts due to the deforestation of its support forest, as well an the intensive agricultural activities in the neighboring areas. There has been established and distributed 13 points of water-collectors disposed inside the stream and the dam. The water samples were taken from the stream only from its surface because of the low depth and, inside. In the dam, the water samples were taken at the water column, at a 50cm distance over the sediment. In every point of collection inside the dam, it was placed a chamber of sedimentation, vertically in the water column at a 70% height from the total depth. The collections took place during the dry/cold and raining/warm periods of the years 2000 and 2001. Then, it were analyzed the physical, physical-chemical, chemical and micro-biological parameters of the water samples. The obtained results were statistically analyzed throughout the SAS system (Statistical Analisys System). Parameters such as total phosphate, nitrate, nitrite and turbidity were within the established limits for the Class 2 water, according to the n° 20/1986 CONAMA Resolução. However, the total and Escherichia coli coliforms, mainly inside the Barrinha stream, had showed values above of the established limits for the same... (Complete abstract click electronic access below)
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Pós-graduação em Fisioterapia - FCT
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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The chloroform extract of bark of the tropical tree Qualea parviflora (Vochysiaceae) was fractionated by column chromatography on silica gel, yielding triterpenes (lupeol, lupenone, betulin, epi-betulinic acid and friedelin) and a steroid (β-sitosterol). β-sitosterol, lupenone and lupeol were also identified in Q. grandiflora and Q. multiflora, while friedelin was detected only in Q. Multiflora, by means of gas chromatography-mass spectrometry. The anti-Mycobacterium tuberculosis activity of the chloroform extract and isolated compounds was assayed by MABA and MIC values ranged from 250.0 to 31.2 µg/mL. This study is the first to investigate the chemistry and antitubercular activity of apolar compounds from Qualea species.
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Pós-graduação em Biociências e Biotecnologia Aplicadas à Farmácia - FCFAR
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Pós-graduação em Ginecologia, Obstetrícia e Mastologia - FMB
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Coumarin is a natural active compound that can be found in many plants. The coumarins have many properties such as bronchodilator, anti-inflammatory, antioxidant, anticoagulant, antibiotics, immunomodulatory, antimicrobial and antiviral, thus, they are widely used in medical applications. More recently the coumarin derivatives have attracted the interest of many research groups in the field of new materials, for example the possibility of their use as sensitizers in dye-sensitized solar cells (DSSC) and lasers. The MCRs are defined as a process in which three or more reactants are combined in the same reaction pot, resulting in products with good structural complexity a single step, in addition to economy of atoms and selectivity and is a very important feature in modern synthetic methodology. In this work we investigated the use of niobium pentachloride as catalyst of the multicomponent reactions between phenolic derivatives, various aromatic aldehydes and β-diester derivatives in the synthesis of 4-aryl-3,4-dihydrocoumarin derivatives. The reactions were carried out at room temperature, under inert atmosphere (N2), using dichloromethane anhydrous (CH2 Cl2) as solvent, with a reaction time of most 120 hours. The products were isolated by column chromatography on silica gel and submitted to spectrometric and spectroscopic analysis. The results show that NbCl5 is an excellent agent for promoting the synthesis of 4-aryl-3,4-dihydrocoumarin derivatives through multicomponent reactions, obtaining yields varying from 45 to 95%
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Pós-graduação em Ciência dos Materiais - FEIS