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.
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.
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.
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.
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.
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.
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.
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.
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.
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 Conceiçao 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.
Bilge ErenI, *; Yunus BekdemirII
A series of benzimidazole derivatives were synthesized in very short times under microwave heating conditions with an easy purification procedure.
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.
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.
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.
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.
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.
Almi F. LimaI; Daniele A. FerreiraI; Francisco José Q. Monte*,I; Raimundo Braz-FilhoII
Stable conformations of aromatics substituted compounds.
Cristina P. B. QuiteteI; Mariana M. V. M. SouzaII, *
Catalysts for tar removal must have resistance to deactivation by coke and sulfur.
Marcos de Campos Cavalcanti de AlbuquerqueI; Claudia Maria Soares RibeiroI; Carlos René Klotz RabeloI; Bernardo Galvao 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).
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).
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.
Hudson C. PoloniniI; Pedro Paulo SoldatiI; Marcone Augusto Leal de OliveiraII; Marcos Antônio F. BrandaoI; 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).
Michele Campos AlvesI; Priscila Aparecida de AlmeidaI; Hudson Caetano PoloniniI; Nádia Rezende Barbosa RaposoI; Anderson de Oliveira FerreiraII; Marcos Antônio Fernandes BrandaoI, *
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.
Lucas F. de PaulaI, *; Alberth C. AlvesI; Heden C. S. AlvesI; Edimar A. RibeiroII; Ana G. B. MadurroIII; Joao M. MadurroI
Schematic representation of a ball mill which has its main components and describes some of their laboratory applications.
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.
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").
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).
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.
On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
Química Nova
Publicações da Sociedade Brasileira de Química
Caixa Postal: 26037
05513-970 São Paulo - SP
Tel/Fax: +55.11.3032.2299/+55.11.3814.3602
Free access