382 resultados para inibidores da síntese de carotenóides


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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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O uso contínuo de antifúngicos tópicos e sistêmicos no tratamento convencional de candidose oral tem resultado no aparecimento de Candida albicans resistente. Por este motivo, novas tecnologias para o desenvolvimento de drogas, como os biofármacos, constituem uma estratégia, além de inovadora devido a seu mecanismo de ação, também promissora no campo da biotecnologia. Verificou-se que esta nova tecnologia possui potencial efeito em diminuir a resistência de microrganismos, especialmente do agente etiológico da candidose bucal. A Candida albicans, agente patológico de origem fúngica, expressa diversos fatores de virulência sendo comumente encontrada na pele, cavidade oral, esôfago, trato gastrointestinal e órgão reprodutor feminino podendo acometer pessoas de idades variadas, imunologicamente comprometidas, ou que utilizam próteses dentárias. Nesse sentido, peptídeos com efeito antifúngico, produzidos por plantas, animais e microrganismos estão sendo utilizados como modelos para o desenvolvimento de novas drogas com aplicações em saúde. A Histatina 5 é um peptídeo encontrado na saliva humana com forte propriedade fungicida in vitro. Este peptídeo é extremamente rico nos aminoácidos histidina e lisina e, em pH fisiológico, possui potencial de inibição da formação do biofilme de Candida albicans, podendo ser aplicado portanto, no tratamento da candidose oral. Nesse contexto, o presente estudo consiste na obtenção de análogos da Histatina-5 com modificações em sua estrutura molecular, com o objetivo de otimizar o seu potencial terapêutico já verificado nos peptídeos da família das Histatinas. A Histatina 5SC possui o aminoácido serina C-terminal substituído pela cisteína, o qual é constituído pelo grupo sulfidrila em sua cadeia lateral, para a formação de dímeros. Os peptídeos foram desenvolvidos sinteticamente pelo método de Síntese Orgânica em Fase Sólida, utilizando-se a estratégia Fmoc e...

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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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Multicomponent Reactions are defined as reactions between three or more reagents in a single reaction step in the same reaction vial, forming a product that includes the majority of atoms and structural characteristics of the reagents. Thus these reactions save time and energy. One of the ways to improve the yield and reaction time of a multicomponent reaction is to use different catalysts, an example of catalyst that shows great potential and has been studied in recent years is the molecular iodine is known to be a Lewis acid with high catalytic power. The functionalized piperidines, also known as tetrahydropyridines, are alkaloids that have pharmacological potential, this is due to the piperidine ring present in many natural product structures with muscarinic activity, nicotine, analgesic, antipsychotic, anti-proliferative, among others. In this paper we describe studies about on the application of molecular iodine (I2) in the multicomponent reaction between aniline derivatives, benzaldehyde and β-ketoester (methyl acetoacetate) for the synthesis of functionalized piperidines and the synthesis of a corresponding piperidone by acid hydrolysis. Data analysis allowed us to demonstrate the efficacy of molecular iodine in the synthesis of functionalized piperidines, obtaining results with yields 44-87% and short reaction time of 8 to 24 hours, and the efficacy of acid hydrolysis of enamine in the structure of the tetrahydropyridine derivative in a yield of 81%

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Atherosclerosis is a chronic inflammatory disease characterized by accumulation of lipid and fibrous components in arterial vessels, giving rise to atheromas. Development of Atheromatou plaques leads to arterial steatosis, triggering ischemic events. Atherotrombosis has a strong correlation with atherosclerosis, where rupture of atheromatous plaques cause release of vessel wall's pro-thrombotic components, activating platelet aggregation and thromosis. Due to the major role played by platelets on thrombus-embolic conditions, drugs that inhibit platelet aggregation demonstrate great relevance for atherothrombosis prevention, reducing patient mortality. Currently, there are a variety of drugs acting on several different targets, preventing platelet activation. However, these therapies demosntrate side effects such as thrombocytopenia, neutropenia, hemorrhage and low oral availability. Thus, the application of molecular modifications such as hybridization can produce novel, more efficient antiplatelet aggregation inhibitors. In this project we describe the synthesis and characterization of novel N-acilhydrazone compounds, acting through multiple mechanisms such as platelet calcium chelation and nitric oxide donation by furoxanic subunits. Furthermore, we demonstrate that such compounds exhibit biological activity in in vivo bleeding time, in vitro antiplatelet aggregation and in vivo antinociceptive assays. Therefore, novel N-acilhydrazone compounds demonstrate potential as antiplatelet drugs for atherothrombosis prevention.

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Pós-graduação em Química - IQ

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Pós-graduação em Biotecnologia - IQ

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Pós-graduação em Agronomia (Agricultura) - FCA