Synchronous Fluorescence
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. 2-(Pyridin-4yl)benzothiazole and Its Benzimidazole-Analogue: Biophysical and in silico Studies on Their Interaction with Urease and in vitro Anti-Helicobacter pylori Activities
In this study, the interaction between benzothiazole (BTA, concentration of a drug required for 50% inhibition in vitro (IC50) = 0.77 mM) and benzimidazole (BIA, IC50 = 2.14 mM) with urease was quantitatively assessed, using UV-Vis, molecular fluorescence, and circular dichroism. The results showed that both compounds interact with urease by a static fluores
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. CHARACTERIZATION OF AQUATIC ORGANIC MATTER IN A NATURAL ENVIRONMENT IN NORTHEASTERN BRAZIL
The organic matter (OM) contained in a natural aquatic environment, located in a tropical region in Notheastern Brazil, was characterized using synchronous fluorescence spectroscopy and UV-Vis absorbance. The synchronous fluorescence spectra did not show qualitative differences for samples collected during dry and rainy seasons. They also revealed two peaks,
Quím. Nova. Publicado em: 2020-12
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3. Determination of Bisphenol A in Paper Products by Synchronous Fluorescence Spectoscopy and Estimation of Daily Exposure
In this study, a simple and fast procedure was developed and validated for the determination of bisphenol A (BPA) in paper products using synchronous fluorescence spectroscopy. The method was used for the determination of BPA in thirteen types of paper products, including thermal receipt papers, lottery tickets, bus tickets, business cards, mailing envelopes
J. Braz. Chem. Soc.. Publicado em: 2020-10
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4. Antibacterial Activity of 2-Amino-1,4-naphthoquinone Derivatives against Gram-Positive and Gram-Negative Bacterial Strains and Their Interaction with Human Serum Albumin
A series of 2-amino-1,4-naphthoquinone derivatives (NQA-NQF) was synthesized by alternative methods (ultrasonication and microwave irradiation), with yields ranging from 40 to 71%, and without the need of further recrystallization. Each compound was evaluated against four Gram-positive (Bacillus subtilis, Enterococcus faecalis, Staphylococcus aureus and Baci
J. Braz. Chem. Soc.. Publicado em: 2020-09
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5. CARACTERIZAÇÃO DA MATÉRIA ORGÂNICA DISSOLVIDA NAS ÁGUAS DAS BACIAS HIDROGRÁFICAS DO ESTADO DE SERGIPE. / CHARACTERIZATION OF DISSOLVED ORGANIC MATTER IN WATERS OF THE STATE OF WATERSHED SERGIPE.
Nesse trabalho foram utilizadas a espectroscopia de fluorescência e as medidas do carbono orgânico dissolvido (COD) e absorvância no UV Vis, para caracterização da matéria orgânica dissolvida (MOD) nas águas das seis bacias hidrográficas do Estado de Sergipe. Foram realizadas quatro campanhas de amostragem no período de maio de 2009 a janeiro de 20
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2011
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6. DESENVOLVIMENTO DE MÉTODOS ANALÍTICOS CROMATOGRÁFICOS, ESPECTROFLUORIMÉTRICOS E ELETROFORÉTICOS PARA A DETERMINAÇÃO DE AZAARENOS BÁSICOS EM QUEROSENE DE AVIAÇÃO / DEVELOPMENT OF ANALYTICAL METHODS BASED ON CHROMATOGRAPHY, FLUORESCENCE AND ELECTROPHORESIS FOR THE DETERMINATION OF BASIC AZAARENES IN JET FUEL SAMPLES
In this work, analytical methods were developed for the selective determination of basic azaarenes. Solid phase extraction (SPE) in combination with high performance liquid chromatography with fluorescence detection (HPLCFD) has been used for the sensitive method determination of six basic azaarenes (7,8-benzoquinoline - 78BQ, 7,9-dimethylbenz[c]acridine - 7
Publicado em: 2009
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7. Spectroscopic studies on the interaction of efonidipine with bovine serum albumin
Efonidipine hydrochloride is an antihypertensive and antianginal agent with fewer side effects and is better tolerated in the treatment of hypertension with renal impairment. Its interaction with bovine serum albumin (BSA) is of great use for the understanding of the pharmacokinetic and pharmacodynamic mechanisms of the drug. The binding of efonidipine to BS
Brazilian Journal of Medical and Biological Research. Publicado em: 2008-07
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8. Análise de fluorescência de substâncias húmicas extraídas da água, solo e sedimento da Lagoa dos Patos - MS
The humic substances were extracted from sediments, water and soil close to the Lagoa dos Patos-MS. The characterization was performed through fluorescence emission. In the HSs it is possible to see strong indications of incorporation of compounds originating from lignin degradation, confirmed by fluorescence emission (EEM and synchronous spectra). These dif
Química Nova. Publicado em: 2008
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9. Assessment of anthropogenic influences on copper complexation by aquatic dissolved organic matter using synchronous fluorescence
Neste trabalho foi avaliada a influência das atividades antrópicas sobre as características da matéria orgânica dissolvida (MOD) aquática empregando-se fluorescência sincronizada (SyF). Amostras dos rios Iraí e Iguaçu foram coletadas em pontos localizados à montante e à jusante de uma região urbanizada, respectivamente, durante o inverno e o ver�
Journal of the Brazilian Chemical Society. Publicado em: 2007
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10. DESENVOLVIMENTO E VALIDAÇÃO DE MÉTODO FOSFORIMÉTRICO EM SUBSTRATO DE CELULOSE PARA DETERMINAÇÃO DE PIRENO E CRISENO / DEVELOPMENT AND VALIDATION OF THE PHOSPHORIMETRIC METHOD IN CELLULOSE SUBSTRATE TO DETERMINATION OF PYRENE AND CHRYSENE
In this work, solid surface room-temperature phosphorimetry (SSRTP) was used to develop ultra-trace and selective methods for determination of chrysene and pyrene in complex samples containing several other polycyclic aromatic hydrocarbons (PAHs). Both chrysene and pyrene were selected because they are classificated by the U.S. Environmental Protection Agenc
Publicado em: 2007
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11. Processo de degradação e adsorção de compostos orgânicos aromáticos em água residual e efluente da indústria do petróleo
Neste trabalho foi avaliada a degradação de compostos aromáticos em água residual e efluente de refinaria de petróleo, sob tratamento fotoquímico, utilizando luz solar e lâmpada a vapor de mercúrio de alta pressão com intensidade média de 200 W/m2, e processo oxidativo, com peróxido de hidrogênio (60 % em peso). No caso específico do tratamento
Publicado em: 2006
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12. Caracterização fluorimetrica da materia organica de origem natural e sua complexação com ions cobre
Marine dissolved organic matter, which has been extracted by adsorption onto SepPak tC18 and, soil fulvic acid processed in the same way, were fractionated by reverse phase high performance liquid chromatography. Based on a stepwise elution gradient, a methodologic procedure was developed using the non-destructive UV-absorption (254 nm) detection system, to
Publicado em: 1995