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.
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...
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.
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.
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.
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.
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.
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.
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.
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.
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%).
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.
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.
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.
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·+ (λmax = 500 and 540 nm).
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.
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.
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+.
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.
Is it possible to obtain Hartree and Hartree-Fock equations via a simpler approach?
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.
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