JBCS



8:20, seg mai 29











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. 38, No. 7, 2015, p. 877-1007

 

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 2015, 38(7), 957-971

Biomateriais: tipos, aplicações e mercado

Ana Luiza R. Pires; Andréa C. K. Bierhalz; Ângela M. Moraes*

Biomaterials: the close relationships of complementary and feedback nature regarding types, forms of application, and markets.

http://dx.doi.org/10.5935/0100-4042.20150094

Publicado online: maio 29, 2015
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Artigos Quim. Nova 2015, 38(7), 877-883

 

Encapsulação do ácido L-ascórbico no biopolímero natural galactomanana por spray-drying: preparação, caracterização e atividade antioxidante

Carlos A. G. de SouzaI,*; Sônia M. C. SiqueiraI; Antônia F. V. de AmorimI; Selene M. de MoraisI; Tamara GonçalvesIII; Rayane N. GomesI; Arcelina P. CunhaII; Nágila M. P. S. RicardoII


The spray drying method was used to microenscapulate ascorbic acid with galactomannan-an extract obtained from Delonix regia seeds. The microparticles were characterized and evaluated to determine their potential application as an antioxidant.

http://dx.doi.org/10.5935/0100-4042.20150104

Publicado online: junho 22, 2015
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Quim. Nova 2015, 38(7), 884-890

 

Evaluation of a buffered solid phase dispersion procedure adapted for pesticide analyses in the soil matrix

Ana María DomínguezI,*; Mario FunesII; Ximena FadicII; Fabian PlacenciaII; Francisco CerecedaII; Juan Pablo MuñozII


Concentrations of pesticides in the soil, such as trifluralin, simazine, iprodione, azinphos-methyl, dimethoate, and permethrin, as well as persistent 4,4'-DDT and its degradation product 4,4'-DDE, can be determined using a citrate-buffered QuEChERS methodology.

http://dx.doi.org/10.5935/0100-4042.20150115

Publicado online: julho 6, 2015
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Quim. Nova 2015, 38(7), 891-895

 

Kinetic study of selective gas-phase oxidation of isopropanol to acetone using monoclinic ZrO2 as a catalyst

Mohammad SadiqI,*,#; Muhammad AliI; Razia AmanI; Haroon Ur RashidII; Muhammad Naveed UmarI


The XRD patterns obtained for the zirconia sample show that at lower temperatures, zirconia was present in tetragonal phase, whereas at higher temperatures, it exhibits a purely monoclinic phase. Zirconia calcined at 1023 K was, however, a blend of both phases.

http://dx.doi.org/10.5935/0100-4042.20150097

Publicado online: junho 12, 2015
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Quim. Nova 2015, 38(7), 896-901

 

Simultaneous determination of protocatechuic aldehyde and protocatechuic acid using the localized surface plasmon resonance peak of silver nanoparticles and chemometric methods

Javad KhodaveisiI; Ali Mohammad Haji ShabaniI; Shayessteh DadfarniaI,*; Masoud Rohani MoghadamII; Mohammad Reza Hormozi-NezhadIII


A kinetic spectrophotometric method has been developed for the simultaneous determination of PAC and PAH. The method is based on the difference in the kinetic rates of reactions of the analytes with silver nitrate in the presence of polyvinylpyrrolidone for producing silver nanoparticles.

http://dx.doi.org/10.5935/0100-4042.20150084

Publicado online: maio 21, 2015
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Quim. Nova 2015, 38(7), 902-909

 

Preliminarily development of a moisture-activated bioresorbable polymeric platform for drug delivery

Renê O. do CoutoI,*; Sven D. SommerfeldII; Koustubh DubeII; Osvaldo de FreitasI; Joachim KohnII


Bioresorbable films were prepared using the tyrosine-derived polycarbonate E2505(2K) and metronidazole (MDZ) as the model drug. The water uptake correlated with the polymer degradation. MDZ exerted a remarkable plasticizing effect on the polymer.

http://dx.doi.org/10.5935/0100-4042.20150118

Publicado online: julho 13, 2015
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Quim. Nova 2015, 38(7), 910-916

 

Microestrutura e propriedades de filmes de amido-álcool polivinílico-alginato adicionados de óleos essenciais de copaíba e capim limão

Renata P. H. BrandeleroI,*; Fábio M. de AlmeidaI; Alexandre AlfaroII


Biodegradable films were obtained from a ternary mixture of starch-polyvinyl alcohol-alginate with lemongrass and copaiba oils (a tree in the Amazonian forest). The biofilms obtained were transparent and enhanced the development of a Fusarium sp. culture.

http://dx.doi.org/10.5935/0100-4042.20150098

Publicado online: junho 12, 2015
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Quim. Nova 2015, 38(7), 917-923

 

Glicerofosfolipídios sintéticos para uso como aditivo biocida em tintas anti-incrustante

William R. BatistaI,II,*; Maria H. C. B. NevesI; Ricardo CoutinhoI; Cláudio C. LopesII; Rosangela S. C. LopesII


The use of glycerophospholipids PAF-analogs as an antifouling biocide was investigated. The possible mechanism of cellular signaling is promoted by a biocidal attack against components of the cytoplasmatic membrane in the microorganism precursors of marine biofilms.

http://dx.doi.org/10.5935/0100-4042.20150101

Publicado online: junho 16, 2015
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Quim. Nova 2015, 38(7), 924-931

 

Biossensor eletroquímico baseado na enzima tirosinase para a determinação de fenol em efluentes

Dejane P. C. de Oliveira; Francisco W. P. Ribeiro; Helena Becker; Pedro Lima-Neto; Adriana N. Correia*


Voltammetric behavior for 5.21 x 10-5 mol L−1 phenol in a phosphate buffer of pH 7.0 at GCE, GCE/Tir(Glu 2%), GCE/NpAu/Tir(Glu 2%), and GCE/NpAu/NTCPM-FtCo/Tir(Glu 2%).

http://dx.doi.org/10.5935/0100-4042.20150086

Publicado online: maio 21, 2015
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Quim. Nova 2015, 38(7), 932-936

 

Chemical constituents, anti-inflammatory, and free-radical scavenging activities of Guettarda viburnoides Cham. & Schltdl. (Rubiaceae)

Maria Augusta NaressiI; Daniele Domingos ManholerI; Franciele Queiroz AmesII; Ciomar Aparecida Bersani-AmadoII; Anelise Samara Nazari FormagioIII; Zefa Valdivina PereiraIV; Willian Ferreira da CostaI; Debora Cristina BaldoquiI; Maria Helena SarragiottoI,*


Chemical constituents were isolated from Guettarda viburnoides. The DPPH free-radical scavenging activity of grandifloroside is reported here for the first time.

http://dx.doi.org/10.5935/0100-4042.20150093

Publicado online: maio 29, 2015
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Quim. Nova 2015, 38(7), 937-943

 

Emissões de óxido nitroso e metano do solo em áreas de recuperação de pastagens na amazônia matogrossense

Anna K. da S. NogueiraI,II; Renato de A. R. RodriguesI,V,*, Bruno S. CastroIII, Thiago F. NogueiraIII,IV, Jacqueline J. N. da SilvaI,II, Maurel BehlingI, Mircéia MombachI, Natassia ArmacoloI e Júlia Graziela SilveiraI,II


Representation of the N2O and CH4 fluxes from the soil to the atmosphere in pastures.

http://dx.doi.org/10.5935/0100-4042.20150109

Publicado online: junho 26, 2015
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Quim. Nova 2015, 38(7), 944-947

 

Asymmetric sulfoxidation of albendazole to ricobendazole by fungi: effect of pH

Thiago BarthI,*; Viviane C. HilárioII; Bruno A. RochaII; Niege A. J. C. FurtadoIII; Mônica T. PupoIII; Anderson R. M. de OliveiraII


pH effect on the asymmetric stereoselective sulfoxidation of Albendazole into Ricobendazole by employing the fungi Nigrospora sphaerica, Papulaspora immersa Hotson, and Mucor rouxii.

http://dx.doi.org/10.5935/0100-4042.20150102

Publicado online: junho 16, 2015
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Quim. Nova 2015, 38(7), 948-956

 

Avaliação do radical N,N-dietil-1,4-fenilenodiamino (DEPD•+) como sonda espectrofotométrica para determinação da capacidade antioxidante em bebidas

Rosicleide Viturina dos Santos; Allysson Roberto Barbosa de Lima; Paulo César Costa de Oliveira; Isis Martins Figueiredo; Josué Carinhanha Caldas Santos*


A spectrophotometric method that determines antioxidant capacities in beverages (wines, teas and infusions) was explored. It was evaluated cation radical production from the oxidation of aromatic amine by Fe(III) ions at pH 4.0 leads to a corresponding reactive purple cation radical DEPD·+max = 500 and 540 nm).

http://dx.doi.org/10.5935/0100-4042.20150103

Publicado online: junho 16, 2015
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Revisão Quim. Nova 2015, 38(7), 972-979

 

Vidros de oxicarbeto de silício obtidos a partir de polissiloxanos

Marco A. SchiavonI,*; Jefferson L. FerrariI; Mirabbos HojamberdievII; Inez Valéria P. YoshidaIII


Silicon oxycarbide glasses are a class of amorphous materials with a similar silica glass structure, in which oxygen atoms are partially replaced by carbon atoms. They are easily prepared through the pyrolysis of cross-linked polysiloxanes and they can also generate crystalline SiC.

http://dx.doi.org/10.5935/0100-4042.20150106

Publicado online: junho 22, 2015
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Nota Técnica Quim. Nova 2015, 38(7), 980-986

 

Análise exploratória das concentrações dos metais NA, CA, MG, SR e FE em extrato aquoso de petróleo, determinados por ICP OES, após otimização empregando planejamento de experimentos

Murilo de O. Souza*; Karla P. Rainha; Eustáquio Vinícius R. Castro; Maria Tereza W. D. Carneiro; Rafael de Q. Ferreira


The purpose of this study was to evaluate the best operating conditions of ICP OES for the determination of Na, Ca, Mg, Sr and Fe in aqueous extract of crude oil. Subsequently, the aqueous extract of crude oil was classified using exploratory analysis.

http://dx.doi.org/10.5935/0100-4042.20150095

Publicado online: maio 29, 2015
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Quim. Nova 2015, 38(7), 987-991

 

A factorial design applied to the study of chromium toxicity on the glutathione levels of Brachiaria brizantha and Brachiaria ruziziensis seedlings

Rafael MarquesI, Marcone A. L. de OliveiraI, Cassia R. G. dos ReisII, Maurício M. KöppIII; Leônidas P. PassosIV,*


In this study, a 23 factorial design was applied in the evaluation of glutathione levels in Brachiaria plants under oxidative stress caused by Cr3+.

http://dx.doi.org/10.5935/0100-4042.20150089

Publicado online: maio 21, 2015
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Quim. Nova 2015, 38(7), 992-994

 

Dispositivo para extração líquido-líquido em sistemas de análises em fluxo

Vitória R. B. SoaresI,II, Fábio R. P. RochaIII, Boaventura F. ReisIII; Leonardo S. G. TeixeiraI,*


A new device is presented for the mechanization of liquid-liquid extractions, which couples a lab-made cell with mechanical stirring to a flow manifold assembled with solenoid valves. The sample and extractant volumes, the stirring time, and the resting time can be defined by the control software.

http://dx.doi.org/10.5935/0100-4042.20150090

Publicado online: maio 21, 2015
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Educação Quim. Nova 2015, 38(7), 995-1001

 

Uma forma simplificada de deduzir as equações de Hartree e Hartree-Fock

Rogério Custodio*


Is it possible to obtain Hartree and Hartree-Fock equations via a simpler approach?

http://dx.doi.org/10.5935/0100-4042.20150083

Publicado online: maio 19, 2015
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Assuntos Gerais Quim. Nova 2015, 38(7), 1002-1007

 

Thomé Rodrigues Sobral (1759-1829) e a virtude febrífuga de um grande número de quinas

António M. Amorim Costa*


The chemical analysis of the Brazilian plant, known as Mil-Homens, was performed in 1814 by Rodrigues Sobral (1759-1829) at the Chemical Laboratory of the University of Coimbra. Sobral's opinion was that the febrifuge power exhibited by the infusions of Mil-Homens can be ascribed to a new compound formed by interactions of the plant's original chemical components.

http://dx.doi.org/10.5935/0100-4042.20150114

Publicado online: julho 2, 2015
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