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Autores: A partir do fascículo 39/9 a revista Química Nova adotou a licença CC-BY. Mais informações a respeito dessa licença podem ser obtidas aqui.

vol. 37, No. 5, 2014, p. 761-926

 

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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(5), 886-895

A química de coordenação e a produção de combustíveis solares

Sinval F. Sousa; Antonio Otavio T. Patrocinio*

The efficient conversion of solar energy into fuels (artificial photosynthesis) through simple systems is one of the great scientific challenges today. The present study shows how the coordination chemistry can be used to generate clean energy from the sun.

http://dx.doi.org/10.5935/0100-4042.20140140

Publicado online: fevereiro 20, 2014
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Artigos Quim. Nova 2014, 37(5), 761-765

 

Catálise básica usando sílica mesoporosa estabilizada por acrilatos encapsulados

Fernanda Tátia Cruz; Dilson Cardoso*


The figure shows the initial formation of the micelle followed by the encapsulation of the monomer and finally its polymerization in the interior of the micelle by UV radiation.

http://dx.doi.org/10.5935/0100-4042.20140122

Publicado online: maio 8, 2014
PDF Informação suplementar
Quim. Nova 2014, 37(5), 766-769

 

Tratamentos térmico e químico para remoção de óxidos alcalinos de cinzas de capim elefante

Erika Y. Nakanishi*,I; Ernesto Villar-CociñaII; Sérgio F. SantosI; Michelle S. RodriguesIII; Pedro S. PintoI; Holmer Savastano JuniorI


The analysis evidenced that the chemical treatment was more efficient to remove the potassium oxide. The pozzolanic activity test and the kinetic parameters for the EGAas indicated that this ash is adequate for cement based composite.

http://dx.doi.org/10.5935/0100-4042.20140123

Publicado online: abril 10, 2014
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Quim. Nova 2014, 37(5), 770-775

 

Análise espacial e quimiométrica da distribuição de espécies metálicas em solos alagáveis e não alagáveis da Bacia do Médio Rio Negro, Amazônia

Mirela Cristina de Oliveira CordovilI; André Gustavo Ribeiro MendonçaII; Wander Gustavo BoteroIII; Ademir dos SantosI; Julio Cesar RochaI; Kaline de MelloIV; Rogério Hartung ToppaV; Luciana Camargo de OliveiraVI,*


Spatial and chemometric analysis of the distribution of metal species in soils of the Basin Middle Rio Negro, showed that proximity to urban areas is probably a variable that influences the organic matter content and metal species in flooded and non-flooded areas.

http://dx.doi.org/10.5935/0100-4042.20140124

Publicado online: abril 10, 2014
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Quim. Nova 2014, 37(5), 776-782

 

Avaliação de diferentes métodos para a determinação de cobre em óleo mineral isolante por espectrometria de absorção atômica com forno de grafite

Luiz Fernando S. CaldasI, II; Carlos Eduardo R. de PaulaI, III; Daniel M. BrumI; Fábio G. LepriI; Ricardo J. CassellaI,*


Absorbance signals obtained in the copper measurement by GFAAS in the extract obtained from extraction induced by emulsion breaking (A), in the direct introduction of emulsion (B) and in the extract obtained from the re-extraction of the oil (C).

http://dx.doi.org/10.5935/0100-4042.20140125

Publicado online: maio 8, 2014
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Quim. Nova 2014, 37(5), 783-788

 

Avaliação da remoção de fármacos e de desreguladores endócrinos em águas de abastecimento por clarificação em escala de bancada

Diego R. S. LimaI; Robson J. C. F. AfonsoI; Marcelo LibânioII; Sérgio F. de AquinoI,*


This paper evidences the low and moderate removal efficiency of emerging microcontaminants by clarification treatment in natural waters with low and high turbidity using aluminum sulfate (SA) and polyaluminium chloride (PAC) as the coagulant.

http://dx.doi.org/10.5935/0100-4042.20140126

Publicado online: abril 10, 2014
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Quim. Nova 2014, 37(5), 789-795

 

Avaliação da atividade antimicrobiana de soluções de flumequina submetidas aos processos eletroquímico e foto-eletroquímico

Caio Rodrigues-Silva; Milena G. Maniero; José Roberto Guimarães*


Electrochemical and photo-electrochemical processes were used to degrade flumequine in aqueous solution: the drug concentration and the antimicrobial activity were reduced throughout the reaction time, and an intermediate with m/z 244 was identified.

http://dx.doi.org/10.5935/0100-4042.20140127

Publicado online: maio 8, 2014
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Quim. Nova 2014, 37(5), 796-803

 

A new approach to evaluate immobilization of β-galactosidase on Eupergit® C: structural, kinetic, and thermal characterization

Anna R. C. BragaI; Marceli F. SilvaII; José V. OliveiraIII; Helen TreichelIV; Susana J. KalilI,*


This study assessed the activity of an immobilized enzyme to determine its potential utilization after the immobilization process.

http://dx.doi.org/10.5935/0100-4042.20140128

Publicado online: maio 8, 2014
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Quim. Nova 2014, 37(5), 804-809

 

Removal of Pb(II) ions and malachite green dye from wastewater by activated carbon produced from lemon peel

Sayed Zia MohammadiI; Mohammad Ali KarimiI; Sayedeh Nasibeh YazdyI; Tayebeh ShamspurII,*; Hooshang HamidianI


A high-surface area activated carbon was prepared by chemical activation of lemon peel. The maximum adsorption capacity of Malachite green dye and Pb(II) ions were found to be 66.67 and 90.91 mg g-1, respectively, at room temperature.

http://dx.doi.org/10.5935/0100-4042.20140129

Publicado online: maio 8, 2014
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Quim. Nova 2014, 37(5), 810-815

 

Análise exploratória aplicada a espectros de reflexão total atenuada no infravermelho com transformada de Fourier (ATR-FTIR) de blendas de biodiesel/diesel

Carla Felippi Chiella Ruschel*; Chun Te Huang; Dimitrios Samios; Marco Flôres Ferrão#


The exploratory analysis of the spectral data obtained by FTIR-HATR, extracted the information from different chemical blends biodiesel/diesel, allowing to identify the different concentrations, different transesterification routes and raw materials used in the process.

http://dx.doi.org/10.5935/0100-4042.20140130

Publicado online: abril 10, 2014
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Quim. Nova 2014, 37(5), 816-820

 

Influência de parâmetros de processo na obtenção de sílica a partir de cinza da casca de arroz pela ação de Fusarium oxysporum

Tatiana G. Pineda-VásquezI; Mabel T. Born e SilvaII; Carlos H. L. SoaresII; Dachamir HotzaI,*


The fungus Fusarium oxysporum was used for the biotransformation of rice husk ash into silica nanoparticles. Glucose concentration, fermentation time and pH have an effect on the production of extracellular enzymes such as β-glucosidase and peroxidase.

http://dx.doi.org/10.5935/0100-4042.20140131

Publicado online: maio 8, 2014
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Quim. Nova 2014, 37(5), 821-826

 

Phenolic composition and antioxidant properties of Brazilian honeys

Fernanda B. Salgueiro; Aline F. Lira; Victor M. Rumjanek; Rosane N. Castro*


Polyphenol-rich honey extracts prepared with Amberlite XAD-4 polymeric resin were analyzed using HPLC coupled with multivariate statistical analysis to detect possible biomarkers of their floral origin.

http://dx.doi.org/10.5935/0100-4042.20140132

Publicado online: maio 8, 2014
PDF Informação suplementar
Quim. Nova 2014, 37(5), 827-832

 

Use of multivariate experimental designs for optimizing the reductive degradation of an azo dye in the presence of redox mediators

Diego R. S. Lima; Bruno E. L. Baeta; Gilmare A. da Silva; Silvana Q. Silva; Sérgio F. Aquino*


In this study, we demonstrate the anaerobic extracellular reduction of an azo dye. Color removal was enhanced by the presence of yeast extract, which is an inexpensive source of the redox mediator riboflavin, and the optimized reductive conditions were established by multivariate experimental design.

http://dx.doi.org/10.5935/0100-4042.20140133

Publicado online: maio 8, 2014
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Quim. Nova 2014, 37(5), 833-838

 

DFT study on low molecular weight α,α-ditert-butyl-4H-cyclopenta[2,1-b,3;4-b']dithiophene and α,α-ditert-butyl-4H-cyclopenta[2,1-b,3;4-b']dithiophene s-oxide bridged derivatives

Banjo Semire*; Olusegun Ayobami Odunola


The frontier orbital energy of α,α-ditert-butyl-4H-cyclopenta[2,1-b,3;4-b']dithiophene (DBDT) and α,α-ditert-butyl-5H-cyclopenta[2,1-b,3;4-b']dithiophene S-oxide (DBDTO) bridged with CH2, C=S, and C=O revealed that the C=S and C=O bridge destabilized the HOMO, lowering the band gap.

http://dx.doi.org/10.5935/0100-4042.20140134

Publicado online: maio 8, 2014
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Quim. Nova 2014, 37(5), 839-843

 

Biodegradable nanoparticles obtained from zein as a drug delivery system for terpinen-4-ol

Vanderléia G. MariniI; Silvia M. MartelliI; Clarice F. ZornioI; Thiago CaonII; Cláudia M. O. SimõesII; Gustavo A. MickeI; Marcone A. L. de OliveiraIII; Vanderlei G. MachadoI; Valdir SoldiI,*


Nanoparticles prepared from zein were used for encapsulation and release of terpinen-4-ol, a therapeutic agent for the treatment of melanoma. The optimized system has the potential for use in anti-melanoma therapy considering that it offers sustained delivery.

http://dx.doi.org/10.5935/0100-4042.20140135

Publicado online: maio 8, 2014
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Quim. Nova 2014, 37(5), 844-849

 

Caracterização físico-química do óleo essencial da Siparuna guianensis Aublet

Augustus Caeser Franke PortellaI,*; Marilda MunaroII; Sergio Donizete AscêncioIII; Chrystian de Assis SiqueiraI; Talita Pereira de Souza FerreiraI; Raimundo Wagner de Souza AguiarI


The essential oil of Siparuna guinansis Aublet, a characteristic plant of the Brazilian cerrado, has medicinal applications and ethnobotany. Infrared spectroscopy is one of the methods used to qualitatively characterize the molecular structure of compounds for the development of new products.

http://dx.doi.org/10.5935/0100-4042.20140136

Publicado online: abril 10, 2014
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Revisão Quim. Nova 2014, 37(5), 850-856

 

Advances in ethanol reforming for the production of hydrogen

Laura Guerrero; Sebastián Castilla; Martha Cobo*


This paper reviewed the following regarding the steam reforming of ethanol: new catalyst design, catalyst stability and new technologies in the reactor configuration.

http://dx.doi.org/10.5935/0100-4042.20140137

Publicado online: abril 3, 2014
PDF
Quim. Nova 2014, 37(5), 857-867

 

Produção de hidrogênio via fermentação anaeróbia - aspectos gerais e possibilidade de utilização de resíduos agroindustriais brasileiros

Lívian R. Vasconcelos de SáI, II; Magali C. CammarotaIII; Viridiana S. Ferreira-LeitãoI,II,*


The use of renewables for obtaining energy and chemicals is a prerequisite for sustainability and Brazilian agro-industrial wastes are still unexplored, but they open up infinite possibilities, which include the hydrogen production by anaerobic fermentation.

http://dx.doi.org/10.5935/0100-4042.20140138

Publicado online: abril 3, 2014
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Quim. Nova 2014, 37(5), 868-885

 

Ocorrência e degradação de quinolonas por processos oxidativos avançados

Caio Rodrigues-Silva; Milena G. Maniero; Marcela S. Peres; José Roberto Guimarães*


A review on the occurrence of quinolones in environmental matrices, the degradation of these compounds by conventional and advanced oxidation processes, including a discussion about intermediates and residual antimicrobial activity, was conducted.

http://dx.doi.org/10.5935/0100-4042.20140139

Publicado online: fevereiro 20, 2014
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Nota Técnica Quim. Nova 2014, 37(5), 896-899

 

Equilibrium studies of 2,2'-(5-bromo-6-methylpyrimidine-2,4-diyl)bis(azanediyl)dipropanoic acid with some transition-metal ions in aqueous solution

Seyed A. A. SajadiI,*; Ghodsieh BagherzadehII; Marzieh KhaleghianI; Maryam MirbagheriI; Hosein SafaieII


The stability constants of the 1:1 complexes formed between M2+ (M2+: Mn2+, Ni2+, Cu2+, or Cd2+) and BMADA2- (BMADA: 2,2'-(5-bromo-6-methylpyrimidine-2,4 diyl)bis(azanediyl)dipropanoic acid) were determined by potentiometric pH titration in aqueous solution. In the M-BMADA complexes, the M ion is able to form a macrochelate via the pyrimidine group of BMADA.

http://dx.doi.org/10.5935/0100-4042.20140144

Publicado online: abril 10, 2014
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Quim. Nova 2014, 37(5), 900-907

 

Determinação de resíduos de agrotóxicos em leite bovino empregando método QuEChERS modificado e GC-MS/MS

Danieli Daiani Bandeira; Juliana S. Munaretto; Tiele M. Rizzetti; Giovana Ferronato; Osmar D. Prestes; Manoel L. Martins; Renato Zanella; Martha B. Adaime*


GC-MS/MS and QuEChERS based method were employed to optimise a rapid and easy sample preparation method for the determination of different pesticide residues in milk. This method could be implemented in many laboratories to reduce inspection time and cost.

http://dx.doi.org/10.5935/0100-4042.20140145

Publicado online: abril 3, 2014
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Educação Quim. Nova 2014, 37(5), 908-914

 

A significação conceitual pela escrita e reescrita orientada em aulas de Química

Judite Scherer Wenzel*,I; Otavio Aloisio MaldanerII


The image shows the interactive process mediated by the language. The people involved in the pedagogical relation interact by the language use, which acts as a mediator in the knowledge meaning process in the classroom.

http://dx.doi.org/10.5935/0100-4042.20140146

Publicado online: março 27, 2014
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Quim. Nova 2014, 37(5), 915-918

 

Resgatando um método eficiente para determinação do ponto de ebulição de substâncias orgânicas: percolador versus Siwoloboff

Flaviana Rodrigues Fintelman Dias; Wanderson Amaral da Silva; Vinícius Rangel Campos; Anna Claudia Cunha; Vitor Francisco Ferreira; Nelson Ângelo de Souza*


The use of percolator is more accurate method than the Siwoloboff's technique for determining the boiling point of organic compounds.

http://dx.doi.org/10.5935/0100-4042.20140147

Publicado online: maio 8, 2014
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Assuntos Gerais Quim. Nova 2014, 37(5), 919-926

 

O que sabemos sobre os primeiros livros didáticos brasileiros para o ensino de Química

Rafael Cava Mori*; Antonio Aprigio da Silva Curvelo


A paper about Brazilian textbooks of Chemistry from XIX century to 1930. A revision of literature is made, as well as an analysis of some of these prime textbooks.

http://dx.doi.org/10.5935/0100-4042.20140148

Publicado online: abril 10, 2014
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