Fernando Antonio Simas Vaz; Cledson Lopes Marta de Oliveira; Marcone Augusto Leal de Oliveira
Representative image of the free animations package, showing analytes and electrolyte motions during analyses by different Capillary Electrophoresis techniques, as well as electropherogram and UV-vis spectrum generation.
Diego S. Rosa; Francine Antelo; Toni J. Lopes; Neusa F. de Moura; Gilber R. Rosa
The experimental design tool was used to evaluate the contribution of temperature, solvent and base in the development of a new catalytic system for Sonogashira cross-coupling using NCP pincer palladacycle 1.
Adolfo E. Ensuncho; Cesar Ortega; Luis C. Sánchez
Optimized geometry at B3LYP/6-31G(d) level of theory of oligomers H-TAZ(4) and CN-TAZ(4). The spheres represent atoms of: Nitrogen (Blue), Carbon (grey) and Hydrogen (white).
Maristela L. S. Melo; Jurandir R. de Souza
Four curves were obtained for barium in different base oils, showing the matrix effect in some cases yet not in others.
Wersângela C. Duaví; Allyne F. Gama; Pollyana C. V. Morais; André H. B. de Oliveira; Ronaldo F. do Nascimento; Rivelino M. Cavalcante
Pesticides are used mostly in rural areas for agriculture, but urban pest control, public health campaigns, and household and veterinary products can also be important sources of these contaminants to aquatic environments.
Bruno H. Vilsinski; Adriana P. Gerola; Évelin O. Lemos; Patrícia M. Barbosa; Katieli S. S. Campanholi; Gabriel B. César; André L. Tessaro; Noboru Hioka; Wilker Caetano
Aluminum phthalocyanine chloride (AlPcCl) is a hydrophobic photosensitizer (PS) which tends to self-aggregate in aqueous media. In this work, the interaction of AlPcCl with micellar copolymers of PluronicTM P-123 and F-127 was studied.
Nathália Lucca Silva; Nathalia Novak Zobiole; Denise Brentan da Silva; Angela Lucia Bagnatori Sartori; Rodrigo Juliano Oliveira; Maria Eduarda Amaral Pinto; Flávio José Leite dos Santos; João Máximo de Siqueira
The phytochemical investigation and evaluation of the phytotoxic effect of the leaves of Annona nutans were performed. Flavonoids and polyketide derivatives were identified as well as phytotoxic activity of chloroform fraction.
Fabrine S. de Souza; Silvana de O. Silva; Lênio J. G. de Faria; Cláudio N. Alves; Adolfo H. Muller; Giselle M. S. P. Guilhon; Davi do S. B. Brasil
Simple linear regression between experimental and theoretical δC (B3LYP / ccpVDZ)of compounds 1, 2 and 3. Data of compounds 2 and 3 were displaced in the y axis of the graph at 30 and 60 ppm, respectively.
Beatriz Adriana Salazar-Cruz; José Luis Rivera-Armenta; Ricardo García-Alamilla; Ana María Mendoza-Martínez; Alejandro Esquivel de la Garza; Sergio Moctezuma Espiricueto
The figure illustrates the chemical bonds resulting from crosslinking of polymer that contribute to adhesive performance.
Pedro H. Britto-Costa; Luís A. M. Ruotolo
This Graphical Abstract shows a drawing of the electrochemical reactor (Spoutedbed electrode), the current efficiency obtained from the experiments, and SEM images of the particles before and after the electrowinning process.
Polyana Fernandes Pereira; Weberson Pereira da Silva; Rodrigo Alejandro Abarza Muñoz; Eduardo Mathias Richter
Fast and simultaneous determination of sulfamethoxazole and trimethoprim using batch injection analysis (BIA) with multiple pulse amperometric detection (MPA).
Janaina Souza-Garcia; Camilo A. Angelucci
Cyclic Voltammogram of Pt(hkl) in 0.1 mol L-1 perchloric (red line) and sulfuric acid (black line). Scan rate: 50 mV s-1.
Paulo C. de Sousa Filho; Osvaldo A. Serra
This work discusses the basic physico-chemical aspects related to the liquid phase synthesis of rare earth-based inorganic nanomaterials, with a brief survey of the classical and recently-developed techniques involving coprecipitations, hydro(solvo)thermal treatments, and reactions in microemulsions.
Susanne Rath; Mónica Johanna Martínez-Mejia; Cláudia Hoffmann Kowalski Schröder
This study presents a critical evaluation of the concepts and procedures defined in the validation and analytical quality control guide called the "Guia de Validação e Controle de Qualidade Analítica - Fármacos em Produtos para Alimentação Animal e Medicamentos Veterinários" (MAPA, Brazil).
Cristina Lenhardt Kaefer; Fernanda Macke Hellwig; Rafael Henrique Dias Reis; Carine Viana Silva; Marcelo Donadel Malesuik
A HPLC-PDA method was developed and validated for the preliminary stability study of synephrine in Citrus aurantium dry extract.
Nagaraju Swamy; Kanakapura Basavaiah
Two simple, rapid and cost-effective spectrophotometric methods were developed and validated for the assay of diethylcarbamazine citrate (DEC) in bulk form and formulations. The methods are based on the charge-transfer (CT) complexation reaction involving DEC as the n- donor and 2,3-dichloro-5,6-dicyano-p-benzoquinone [DDQ] (method A) and 2,4-dinitro phenol [DNP] (method B) as π-acceptors in chloroform.
Lázaro J. Dalla Costa Jr.; Ernesto C. Pereira
Information on the nature of oscillatory behavior in valve metal anodization at constant current was investigated using high temporal resolution measures obtained with a low-cost setup.
Valéria B. Riatto; Mauricio M. Victor; Sílvio Cunha; Ana C. R. Magalhães; Fernanda T. Cruz; Camila S. Carriço
An undergraduate organic chemistry experiment based on thermal cracking of glycerin is proposed. Glycerin is obtained as a by-product from the practice of biodiesel synthesis, and allows reduction of waste produced in the lab.
Antonio Carlos Borin; Adalberto Vasconcelos Sanches de Araújo
Exercises on how to choose the active space for a multiconfigurational calculation.
Alexander Rangel Bastos; Júlio Carlos Afonso
Evolution of the centrifuge and of filter paper over the past 100 years.
On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
Publicações da Sociedade Brasileira de Química
Caixa Postal: 26037 05513-970 São Paulo - SP