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11:40, qua jul 26











Autores: informamos que, a partir do próximo fascículo (39/9), a revista Química Nova adotará a licença CC-BY. Mais informações a respeito dessa licença podem ser obtidas aqui.

vol. 37, No. 4, 2014, p. 583-760

 

Submission procedures for OPEN ACCESS

The Board of Directors of the Sociedade Brasileira de Química-SBQ (publisher of the Química Nova-QN) decided that QN will adopt the full open access format in which authors are required to cover part of the publication costs for their articles. See more...



Artigo de Capa
Quim. Nova 2014, 37(4), 677-688

Eletrocromismo: fundamentos e a aplicação de nanomateriais no desenvolvimento de eletrodos de alto desempenho

Ronaldo C. Quintanilha; Igor Rocha; Raquel B. Vichessi; Emili Lucht; Karine Naidek; Herbert Winnischofer; Marcio Vidotti*

In this review we discuss the most recent trends in electrochromism, describing the basic aspects and the new methodologies employed for the construction of high performance electrodes based on nanostructures of different materials.

http://dx.doi.org/10.5935/0100-4042.20140112

Publicado online: fevereiro 20, 2014
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Artigos Quim. Nova 2014, 37(4), 584-588

 

Synthesis, characterization and computational studies of (E)-2-{[(2-aminopyridin-3-yl)imino]-methyl}-4,6-di-tert-butylphenol

Alexander CarreñoI; Andrés VegaI,#; Ximena ZarateII; Eduardo SchottII; Manuel GacitúaIII; Ninnette ValenzuelaIII; Marcelo PreiteIV; Juan M. ManríquezIII; Ivonne ChávezIII,*


We synthesized the (E)-2-{[(2-AMINOPYRIDIN-3-YL)IMINO]-METHYL}- 4,6-DI-tert-BUTYLPHENOL ligand and characterized by FTIR, UV-vis, 1H-13C NMR , 1D TOCSY spectra and cyclic voltammetric. This study included theoretical calculation using DFT Theory.

http://dx.doi.org/10.5935/0100-4042.20140098

Publicado online: abril 10, 2014
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Quim. Nova 2014, 37(4), 589-596

 

Delineamentos experimentais eficientes para estudos de cinética química

Iuri E. P. FerreiraI, *; Luzia A. TrincaII; Cláudia P. FerreiraII


The D-optimal Designs allow the fitting and comparison of the Michaelis-Menten and Hill models. Furthermore, they ensure precise estimations of the kinetic parameters for both models.

http://dx.doi.org/10.5935/0100-4042.20140102

Publicado online: março 27, 2014
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Quim. Nova 2014, 37(4), 597-602

 

Caracterização físico-química de resíduos oleosos do saneamento e dos óleos e graxas extraídos visando a conversão em biocombustíveis

Jairo Pinto de OliveiraI, *; Paulo Wagnner Pereira AntunesI; Laura Marina PinottiII; Sérvio Túlio Alves CassiniI


Process used for the extraction and characterization of oily waste sanitation, targeting the use of biofuels.

http://dx.doi.org/10.5935/0100-4042.20140094

Publicado online: fevereiro 20, 2014
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Quim. Nova 2014, 37(4), 603-609

 

Chemical constituents isolated from Turnera subulata Sm. and electrochemical characterization of phaeophytin b

Severino Gonçalves de Brito FilhoI,#; Marianne Guedes FernandesI,#; Otemberg Souza ChavesI,#; Maria Célia de Oliveira ChavesI,#; Felipe Bastos ArarunaIII; Carla EirasIII; José Roberto de Souza de Almeida LeiteIII; Maria de Fátima AgraI,#; Raimundo Braz-FilhoII; Maria de Fátima Vanderlei de SouzaI,*,#


Phaeophytin b, natural product of plant, arouses interest as material used in the construction of optical -electronic devices employed in photodynamic therapy and in the development of electrochemical biosensors.

http://dx.doi.org/10.5935/0100-4042.20140099

Publicado online: março 27, 2014
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Quim. Nova 2014, 37(4), 610-617

 

Adsorção de CO2 em peneiras moleculares micro e mesoporosas

Thiago G. OliveiraI; Sanny W. M. MachadoI; Silvia C. G. SantosII; Marcelo J. B. SouzaII; Anne M. Garrido Pedrosa I, *


The Figure shows the amounts of carbon dioxide adsorbed in micro and mesoporous molecular sieves according to different structures and also due to the presence of amines in the mesoporous molecular sieves.

http://dx.doi.org/10.5935/0100-4042.20140101

Publicado online: fevereiro 20, 2014
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Quim. Nova 2014, 37(4), 618-623

 

Líquidos iônicos como plastificantes em blendas de borracha nitrílica/polianilina

Leandro PrudêncioI; Fernanda Ferraz CamiloI; Roselena FaezII, *


The electrical conductivity of PANI having ionic liquid (IL) depends on the anion of the ionic liquid employed. Both PANI-LI as the elastomeric composite show higher conductivity and homogeneity when prepared with Tf2N ionic liquids.

http://dx.doi.org/10.5935/0100-4042.20140103

Publicado online: março 21, 2014
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Quim. Nova 2014, 37(4), 624-630

 

A regra de Bent contextualiza a força da ligação de hidrogênio em clusters trimoleculares

Ives T. O. Santos; Danilo G. Rego; Boaz G. Oliveira*


The π∙∙∙H and n∙∙∙H hydrogen bond strengths of the C2H2∙∙∙HCN∙∙∙HX and C2H4∙∙∙HCN∙∙∙HX (X = CN or Cl) clusters and red-shifts on the proton donor bonds are in line with the Bent rule.

http://dx.doi.org/10.5935/0100-4042.20140107

Publicado online: abril 10, 2014
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Quim. Nova 2014, 37(4), 631-637

 

Determinação espectrofotométrica indireta de capsaicinoides em pimentas Capsicum a partir da reação com o complexo de Co(II) com 4-(2-piridilazo) resorcinol

Patrícia Tonon de Souza; Adriana Vitorino Rossi*


Total capsaicinoids in Capsicum pepper extract obtained with cachaça were quantified spectrophotometrically from the effect of capsaicinoids in absorbance of the Co(II) with 4-(2-pyridylazo) resorcinol (PAR) complex.

http://dx.doi.org/10.5935/0100-4042.20140100

Publicado online: fevereiro 26, 2014
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Quim. Nova 2014, 37(4), 638-642

 

Constituintes químicos e avaliação das atividades antioxidante e anti-inflamatória das raízes de Sabicea brasiliensis Wernh (Rubiaceae)

Jucilene Cavalini BatistaI; Silvana Maria de Oliveira SantinI; Ivânia T. Albrecht SchuquelI; Laura Lícia Milani de ArrudaII; Ciomar Aparecida Bersani-AmadoII; Cecília Maria Alves de OliveiraIII; Lucilia KatoIII; Heleno Dias FerreiraIV; Cleuza Conceição da SilvaI, *


In this paper we report the isolation of the main chemical constituents from the roots of Sabicea brasiliensis and evaluation of the antioxidant and antiinflammatory activities.

http://dx.doi.org/10.5935/0100-4042.20140095

Publicado online: março 27, 2014
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Quim. Nova 2014, 37(4), 643-647

 

Simple, mild, and highly efficient synthesis of 2-substituted benzimidazoles and bis-benzimidazoles

Bilge ErenI, *; Yunus BekdemirII


A series of benzimidazole derivatives were synthesized in very short times under microwave heating conditions with an easy purification procedure.

http://dx.doi.org/10.5935/0100-4042.20140096

Publicado online: março 27, 2014
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Quim. Nova 2014, 37(4), 648-652

 

Autoagregação da 5,10,15,20-tetrakis(4-metoxifenil)porfirina (TMPP): estudos espectroscópicos e análises multivariadas

Gustavo BragaI; Jader L. AparicioI; Bruno H. VilsinskiI; André L. TessaroII; Adriana P. GerolaI, *; Noboru HiokaI; Wilker CaetanoI


Self-aggregation studies of TMPP were carried out in water/ethanol mixtures. The TMPP was kept monomeric up to 25 % of water. The formation of oblique headto- tail and J-type aggregates were observed with increasing percentage of water.

http://dx.doi.org/10.5935/0100-4042.20140105

Publicado online: março 21, 2014
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Quim. Nova 2014, 37(4), 653-657

 

Ultrafiltration membranes from waste polyethylene terephthalate and additives: synthesis and characterization

Smitha Rajesh; Zagabathuni Venkata Panchakshari Murthy*


The incorporation of additives into a membrane prepared from recycled waste polymer has been confirmed. The uniform distribution of the additive in the membrane leads to a change in the surface properties. The recycling of any polymeric material into a usable and durable product is of significant interest from an environmental viewpoint.

http://dx.doi.org/10.5935/0100-4042.20140097

Publicado online: março 27, 2014
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Quim. Nova 2014, 37(4), 658-662

 

Propriedades relacionadas à acidez e basicidade a partir da abordagem em Química Computacional

Sérgio R. B. Silva; Caio L. Firme*; Kássio M. G. Lima


Linear relation of between DG of acid dissociation and DG of hydrolysis of the corresponding conjugate base.

http://dx.doi.org/10.5935/0100-4042.20140108

Publicado online: março 21, 2014
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Quim. Nova 2014, 37(4), 663-666

 

Flavonoides glicosilados de Erythroxylum pulchrum A. St.-Hil. (Erythroxylaceae)

Camila Holanda de AlbuquerqueI; Josean Fechine TavaresI, *; Steno Lacerda de OliveiraI; Tainá Souza SilvaI; Gregório Fernandes GonçalvesII; Vicente Carlos de Oliveira CostaI; Maria de Fátima AgraIII; Hilzeth de Luna Freire PessôaII; Marcelo Sobral da SilvaI


The phytochemical investigation of Erythroxylum pulchrum led to the isolation of quercetin-3-O-α-L-rhaminoside, ombuin-3-ruthinoside e ombuin-3-ruthinoside- 5-glucoside. The methanol extract inhibited the growth of bacteria S. aureus ATCC 25925.

http://dx.doi.org/10.5935/0100-4042.20140104

Publicado online: fevereiro 20, 2014
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Quim. Nova 2014, 37(4), 667-671

 

Determination of flavonoids in stamen, gynoecium, and petals of Magnolia grandiflora L. and their associated antioxidant and hepatoprotection activities

Nadia M. SokkarI ,II, *; Mohamed A. RabehII; Gamal GhazalIII; Amani M. SlemIV


A chromatographic analysis of the flavonoids in stamen, gynaecium and petal of Magnolia grandiflora L. was done by HPLC-PDA-MS/MS-ESI. Antioxidant and hepatoprotective effects of their ethanolic extracts were carried out against hepatotoxicity induced by CCl4 as compared by silymarin.

http://dx.doi.org/10.5935/0100-4042.20140106

Publicado online: março 27, 2014
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Quim. Nova 2014, 37(4), 672-676

 

Flavonoides de Lonchocarpus araripensis (Leguminoseae) - isolamento, atribuição inequívoca dos sinais de RMN 1H e 13C e análise conformacional

Almi F. LimaI; Daniele A. FerreiraI; Francisco José Q. Monte*,I; Raimundo Braz-FilhoII


Stable conformations of aromatics substituted compounds.

http://dx.doi.org/10.5935/0100-4042.20140109

Publicado online: abril 3, 2014
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Revisão Quim. Nova 2014, 37(4), 689-698

 

Remoção do alcatrão de correntes de gaseificação de biomassa: processos e catalisadores

Cristina P. B. QuiteteI; Mariana M. V. M. SouzaII, *


Catalysts for tar removal must have resistance to deactivation by coke and sulfur.

http://dx.doi.org/10.5935/0100-4042.20140110

Publicado online: fevereiro 10, 2014
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Quim. Nova 2014, 37(4), 699-708

 

Aplicações de enzimas na síntese e na modificação de polímeros

Marcos de Campos Cavalcanti de AlbuquerqueI; Claudia Maria Soares RibeiroI; Carlos René Klotz RabeloI; Bernardo Galvão SiqueiraI; Ana Beatriz Abreu Santa MarinhaII; Aline Machado de CastroI, *


Polyester synthesis is one of the main applications of enzymes in polymer technology. In the reaction below, a lipase acts as biocatalyst for the synthesis of poly(lactic acid) (PLA).

http://dx.doi.org/10.5935/0100-4042.20140113

Publicado online: março 21, 2014
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Quim. Nova 2014, 37(4), 709-715

 

Análise química da biomassa - uma revisão das técnicas e aplicações

Sílvio Vaz Júnior*; Itânia Pinheiro Soares


Flowchart for a biomass chain (left). Chemical analyses could be used in all steps, from raw material to residues (right).

http://dx.doi.org/10.5935/0100-4042.20140111

Publicado online: fevereiro 3, 2014
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Nota Técnica Quim. Nova 2014, 37(4), 716-719

 

Preliminary data on Brazilian monofloral honey from the northeast region using FT-IR ATR spectroscopic, palynological, and color analysis

Ligia Bicudo de Almeida-MuradianI, *; Renato J. SousaI; Ortrud Monika BarthII; Peter GallmannIII


FT-IR ATR was used to predict 14 different measurands in northeast Brazilian honey samples. The results showed that mid-infrared spectrometry can be used as a screening method for the routine analysis of Brazilian honey with the advantages to be rapid, non-destructive and accurate.

http://dx.doi.org/10.5935/0100-4042.20140115

Publicado online: fevereiro 26, 2014
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Quim. Nova 2014, 37(4), 720-727

 

Transdermal formulations containing human sexual steroids: development and validation of methods and in vitro drug release

Hudson C. PoloniniI; Pedro Paulo SoldatiI; Marcone Augusto Leal de OliveiraII; Marcos Antônio F. BrandãoI; Maria das Graças M. ChavesI; Nádia R. B. RaposoI, *


In this work, we assessed the in vitro release of bioidentical human sexual hormones in four different liposomal transdermal emulsions (containing testosterone or progesterone or estradiol or estradiol + estriol).

http://dx.doi.org/10.5935/0100-4042.20140116

Publicado online: março 27, 2014
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Quim. Nova 2014, 37(4), 728-735

 

Green tea in transdermal formulation: HPLC method for quality control and in vitro drug release assays

Michele Campos AlvesI; Priscila Aparecida de AlmeidaI; Hudson Caetano PoloniniI; Nádia Rezende Barbosa RaposoI; Anderson de Oliveira FerreiraII; Marcos Antônio Fernandes BrandãoI, *


An analytical method by RP-HPLC was developed and validated to be used both for quality control of green tea in a semisolid formulation and for in vitro drug release assays. Epigallocatechin 3-gallate showed a good flux rates in synthetic membrane when used from tested formulation.

http://dx.doi.org/10.5935/0100-4042.20140117

Publicado online: março 27, 2014
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Quim. Nova 2014, 37(4), 736-739

 

Diretrizes para a construção de um moinho de bolas para a moagem de sólidos em laboratórios

Lucas F. de PaulaI, *; Alberth C. AlvesI; Heden C. S. AlvesI; Edimar A. RibeiroII; Ana G. B. MadurroIII; João M. MadurroI


Schematic representation of a ball mill which has its main components and describes some of their laboratory applications.

http://dx.doi.org/10.5935/0100-4042.20140114

Publicado online: fevereiro 3, 2014
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Educação Quim. Nova 2014, 37(4), 740-744

 

Propuesta de un test para determinar el conocimiento conceptual de estudiantes universitarios sobre la constante de equilibrio químico y su aplicación en estudiantes españoles

Manel Martínez-Grau; Joan Josep Solaz-Portolés*; Vicent Sanjosé


The chemical equilibrium constant can generate didactic problems. In this study, we propose a way to determine students' conceptual knowledge of this constant.

http://dx.doi.org/10.5935/0100-4042.20140118

Publicado online: fevereiro 10, 2014
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Quim. Nova 2014, 37(4), 745-747

 

Preparation and properties of perichromic dye: an undergraduate laboratory

Priscilla Abarca; Patricia Silva; Iriux Almodovar; Marcos Caroli Rezende*


In a colorful undergraduate lab, perichromism is illustrated with an easily prepared dye whose solutions are sensititive to the solvent ("solvatochromism"), to the addition of salts ("halochromism"), and to the temperature ("thermochromism").

http://dx.doi.org/10.5935/0100-4042.20140120

Publicado online: abril 3, 2014
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Quim. Nova 2014, 37(4), 748-752

 

Dinâmica não-linear e reagente limitante: um exemplo de bifurcação transcrítica

Diego J. R. da Silva*


The limiting reagent influence on the nonlinear dynamics of a bimolecular reaction is investigated by phase plane plots (in red) and integral curves (in blue).

http://dx.doi.org/10.5935/0100-4042.20140119

Publicado online: fevereiro 20, 2014
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Assuntos Gerais Quim. Nova 2014, 37(4), 753-760

 

Terras raras no Brasil: histórico, produção e perspectivas

Paulo C. de Sousa Filho; Osvaldo A. Serra*


This contribution discusses the properties, the applications and the current scenario of the rare earth elements in Brazil, and some perspectives regarding the prospection, the market and the government policy about these valuable resources are pointed.

http://dx.doi.org/10.5935/0100-4042.20140121

Publicado online: março 21, 2014
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On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
Química Nova
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