JBCS



18:53, ter jul 7

Edição Atual vol. 38, No. 5, 2015, p. 605-756



Artigo de Capa
Quim. Nova 2015, 38(5), 732-737

Fundamentos de eletroforese capilar: uma abordagem por animações

Fernando Antonio Simas VazI,*; Cledson Lopes Marta de OliveiraII; Marcone Augusto Leal de OliveiraI

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.

http://dx.doi.org/10.5935/0100-4042.20150065

Publicado online: abril 14, 2015
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Artigos Quim. Nova 2015, 38(5), 605-608

 

Effects of solvent, base, and temperature in the optimisation of a new catalytic system for sonogashira cross-coupling using NCP pincer palladacycle

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.

http://dx.doi.org/10.5935/0100-4042.20150045

Publicado online: abril 1, 2015
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Quim. Nova 2015, 38(5), 609-613

 

A theoretical evaluation of electroconductive properties for [1,2,4]-triazole 4N-substituted polymers

Adolfo E. EnsunchoI; Cesar OrtegaII; Luis C. SánchezII,*


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).

http://dx.doi.org/10.5935/0100-4042.20150046

Publicado online: abril 1, 2015
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Quim. Nova 2015, 38(5), 614-621

 

Estudo do efeito de matriz na determinação de metais em óleos básicos rerrefinados por fluorescência de raios X por energia dispersiva

Maristela L. S. MeloI,*; Jurandir R. de SouzaII


Four curves were obtained for barium in different base oils, showing the matrix effect in some cases yet not in others.

http://dx.doi.org/10.5935/0100-4042.20150047

Publicado online: abril 1, 2015
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Quim. Nova 2015, 38(5), 622-630

 

Contaminação de ambientes aquáticos por "agrotóxicos urbanos": o caso dos rios Cocó e Ceará, Fortaleza - Ceará, Brasil

Wersângela C. DuavíI; Allyne F. GamaI; Pollyana C. V. MoraisI; André H. B. de OliveiraI; Ronaldo F. do NascimentoII; Rivelino M. CavalcanteI,*


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.

http://dx.doi.org/10.5935/0100-4042.20150055

Publicado online: abril 14, 2015
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Quim. Nova 2015, 38(5), 631-639

 

Spectroscopic study of aluminum phthalocyanine chloride (AlPcCl) in homogeneous and micro-heterogeneous media consisting of P-123 and F-127 polymeric micelles

Bruno H. VilsinskiI,*; Adriana P. GerolaII; Évelin O. LemosI; Patrícia M. BarbosaI; Katieli S. S. CampanholiI; Gabriel B. César, André L. TessaroIII; Noboru HiokaI; Wilker CaetanoI


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.

http://dx.doi.org/10.5935/0100-4042.20150056

Publicado online: maio 14, 2015
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Quim. Nova 2015, 38(5), 640-644

 

Constituintes químicos e atividade fitotóxica das folhas de Annona nutans

Nathália Lucca SilvaI; Nathalia Novak ZobioleII; Denise Brentan da SilvaIII; Angela Lucia Bagnatori SartoriIV; Rodrigo Juliano OliveiraII; Maria Eduarda Amaral PintoI; Flávio José Leite dos SantosI; João Máximo de SiqueiraI,*


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.

http://dx.doi.org/10.5935/0100-4042.20150066

Publicado online: abril 28, 2015
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Quim. Nova 2015, 38(5), 645-650

 

Dados espectroscópicos de diterpenos labdânicos: uma análise teórica via RMN e DFT

Fabrine S. de SouzaI; Silvana de O. SilvaI; Lênio J. G. de FariaII; Cláudio N. AlvesI; Adolfo H. MullerIII; Giselle M. S. P. GuilhonI; Davi do S. B. BrasilII,*


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.

http://dx.doi.org/10.5935/0100-4042.20150057

Publicado online: abril 14, 2015
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Quim. Nova 2015, 38(5), 651-656

 

Evaluación térmica del curado de adhesivos base SBR usando peróxido de dicumilo

Beatriz Adriana Salazar-CruzI; José Luis Rivera-ArmentaI,*; Ricardo García-AlamillaI; Ana María Mendoza-MartínezI; Alejandro Esquivel de la GarzaII; Sergio Moctezuma EspiricuetoII


The figure illustrates the chemical bonds resulting from crosslinking of polymer that contribute to adhesive performance.

http://dx.doi.org/10.5935/0100-4042.20150067

Publicado online: abril 28, 2015
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Quim. Nova 2015, 38(5), 657-662

 

Eletrorrecuperação de cobre utilizando reator eletroquímico de leito de jorro

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.

http://dx.doi.org/10.5935/0100-4042.20150068

Publicado online: abril 28, 2015
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Quim. Nova 2015, 38(5), 663-668

 

Determinação rápida e simultânea de sulfametoxazol e trimetoprima utilizando análise por injeção em batelada com detecção amperométrica e eletrodo de diamante dopado com boro

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).

http://dx.doi.org/10.5935/0100-4042.20150059

Publicado online: abril 14, 2015
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Revisão Quim. Nova 2015, 38(5), 669-678

 

O papel dos ânions no comportamento voltamétrico de superfícies monocristalinas de platina

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.

http://dx.doi.org/10.5935/0100-4042.20150048

Publicado online: abril 1, 2015
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Quim. Nova 2015, 38(5), 679-696

 

Metodologias de síntese em fase líquida para a obtenção de nanomateriais inorgânicos à base de terras raras

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.

http://dx.doi.org/10.5935/0100-4042.20150049

Publicado online: abril 1, 2015
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Nota Técnica Quim. Nova 2015, 38(5), 697-708

 

Considerações e implicações práticas do guia de validação e controle de qualidade analítica de fármacos em produtos para alimentação animal e medicamentos veterinários

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).

http://dx.doi.org/10.5935/0100-4042.20150060

Publicado online: abril 14, 2015
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Quim. Nova 2015, 38(5), 709-714

 

Desenvolvimento e validação de método por clae-dad e estudo preliminar da estabilidade da sinefrina em extrato seco de Citrus aurantium L.

Cristina Lenhardt KaeferI; Fernanda Macke HellwigI; Rafael Henrique Dias ReisI; Carine Viana SilvaII; Marcelo Donadel MalesuikI,*


A HPLC-PDA method was developed and validated for the preliminary stability study of synephrine in Citrus aurantium dry extract.

http://dx.doi.org/10.5935/0100-4042.20150050

Publicado online: abril 1, 2015
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Quim. Nova 2015, 38(5), 715-722

 

Simple and selective spectrophotometric assay of diethylcarbamazine citrate using 2,3-dichloro-5,6-dicyano-p-benzoquinone and 2,4-dinitro phenol

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.

http://dx.doi.org/10.5935/0100-4042.20150061

Publicado online: abril 14, 2015
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Quim. Nova 2015, 38(5), 723-726

 

Construção de um sistema de baixo custo com alta frequência de aquisição de dados para cronopotenciometria

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.

http://dx.doi.org/10.5935/0100-4042.20150062

Publicado online: abril 14, 2015
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Educação Quim. Nova 2015, 38(5), 727-731

 

Craqueamento térmico da glicerina: uma proposta de experimento para química orgânica

Valéria B. RiattoI,III,*; Mauricio M. VictorI,III; Sílvio CunhaI,III; Ana C. R. MagalhãesI; Fernanda T. CruzII,IV; Camila S. CarriçoII


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.

http://dx.doi.org/10.5935/0100-4042.20150052

Publicado online: abril 1, 2015
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Quim. Nova 2015, 38(5), 738-748

 

Dicas sobre a construção do espaço ativo em cálculos multiconfiguracionais: um estudo de casos

Antonio Carlos Borin*; Adalberto Vasconcelos Sanches de Araújo


Exercises on how to choose the active space for a multiconfigurational calculation.

http://dx.doi.org/10.5935/0100-4042.20150054

Publicado online: abril 1, 2015
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Assuntos Gerais Quim. Nova 2015, 38(5), 749-756

 

Separação sólido-líquido: centrífugas e papéis de filtro

Alexander Rangel BastosI; Júlio Carlos AfonsoII,*


Evolution of the centrifuge and of filter paper over the past 100 years.

http://dx.doi.org/10.5935/0100-4042.20150043

Publicado online: março 23, 2015
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