ISSN:0100-4042
ISSN:1678-7064 on line
Volume 37, Número 10, 2014
Artigo
1579 A simple square-wave voltammetric method for the determination of scopolamine in pharmaceuticals using a
boron‑doped diamond electrode
Simone B. Santos, Camila F. Valezi, Jessica Scremin,
Carlos A. R. Salamanca-Neto, Luiz H. Dall’Antonia and
Elen R. Sartori
A new voltammetric method was developed for the determination of scopolamine
in pharmaceutical formulations using a cathodically pretreated boron-doped
diamond electrode.
1584 Application of Fourier transform infrared spectroscopy,
chemical and chemometrics analyses to the characterization
of agro-industrial waste
Nathalie Merlin, Barbara A. Nogueira, Vanderlei A. de
Lima and Larissa M. dos Santos
The FTIR spectrum of poultry litter and cattle manure samples showed the
characterization of the OM of the residues, indicating the functional groups
present and their intensity.
1589 Determination of Mn2+ ion by solution scanometry as a new,
simple and inexpensive method
Ardeshir Shokrollahi and Nasrin Shokrollahi
Steps of solution scanometry method for determination of Mn2+ ion, using periodate
as oxidizing reagent.
1594 Remoção do ácido mefenâmico em água utilizando carvão
ativado em pó, lama vermelha e oxidação com cloro
Rodrigo B. Moruzzi, Verônica B. Lima, Renata Colombo,
Fabiano T. Conceição e Marcos R. V. Lanza
The removal of mefenamic acid in aqueous solution was investigated using
activated carbon powder (ACP), red mud and oxidation with chlorine.
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Quim. Nova
1600 Influence of initial CaO/SiO2 ratio on the hydration of rice
husk ash-Ca(OH)2 and sugar cane bagasse ash-Ca(OH)2
pastes
Lourdes Mª S. de Souza, Eduardo de M. R. Fairbairn,
Romildo D. Toledo Filho and Guilherme C. Cordeiro
Pastes containing calcium hydroxide and either rice husk ash or sugar cane bagasse
ash, in various initial CaO/SiO2 molar ratios, produce different types of calcium
silicate hydrates (CaO-SiO2-H2O), and inclusions of calcium aluminate hydrates.
1606 In vitro effect of isoschaftoside isolated from Syngonium
podophyllum on pig kidney Na+, K+‑ATPase
Anne C. C. Gomes, Luzia da S. Sampaio, Paulo A. da Silva,
Marcelo E. Lamas, Cassia M. Sakuragui, Cleber B. Barreto
Junior, Naomi K. Simas and Ricardo M. Kuster
Isoschaftoside from Syngonium podophyllum significantly decreased the pig renal
Na+, K+-ATPase activity at different concentrations.
1610 Preparation and evaluation of magnetic chitosan particles
modified with ethylenediamine and Fe(III) for the removal
of Cr(VI) from aqueous solutions
Thiago V. Toledo, Carlos R. Bellato, Carlos H. Ferreira de
Souza, Junielly T. Domingues, Danilo de C. Silva, César
Reis and Maurício P. Ferreira Fontes
This study shows the steps of preparing a new magnetic adsorbent of chitosan
modified with ethylenediamine and Fe (III) (MPCh-EDA-FeCL). When evaluated
on the removal of Cr (VI) aqueous solutions MPCh-EDA-FeCL indicated interesting
adsorption properties. This adsorbent was successfully applied in electroplating
effluent.
1618 Determinação da atividade antitríptica em proteínas de produtos do amendoim isoladas por cromatografia de afinidade
Jéssica M. de Araújo, Jussara C. Alves, Thayane K. O.
das N. Peixoto, Amanda F. de Medeiros, Richele J. de A.
Machado, Alexandre C. Serquiz, Renata A. M. das Neves,
Elizeu A. dos Santos, Adriana F. Uchôa e Ana H. de A.
Morais
Affinity chromatography on trypsin - Sepharose CNBr 4B proved an efficient
technique for isolating protein inhibitors with antitryptic specific activity in
Japanese peanut, peanut nougat, and peanut butter.
Vol. 37, No. 10
1624 Coprecipitation of trace amounts of silicon with aluminum
hydroxide and the determination by flame atomic absorption
spectrometry
Ardeshir Shokrollahi and Masoud Gohari
Aluminum hydroxide is an excellent collector in the determination of silicon by
coprecipitation method.
1629 Determination of anti-cancer drug emodin using a silica-gel-modified carbon paste electrode
Dai L. Vu, Bensu Ertek, Yusuf Dilgin and Libor Cervenka
Possible mechanism of electrochemical determination of emodin using silica
gel modified carbon paste electrode by anodic stripping differential pulse
voltammetry.
1633 Interação de complexo de rutênio com albumina de soro
bovino para detecção amperométrica de ácido ascórbico
Ronnie E. da Silva, Kalil C. F. Toledo, Herculys B. Jorge,
Bento Moreira Neto, Vagner R. de Souza e Helena S.
Nakatani
Ruthenium complex quenched bovine serum albumin (BSA) fluorescence. The
formation of the Ru-BSA complex was spontaneous through a dynamic quenching
process. The binding constants, binding sites, and thermodynamic parameters
were calculated.
1639 Efeito da variação de parâmetros reacionais na preparação
de grafeno via oxidação e redução do grafite
Hiany Mehl, Carolina F. Matos, Eduardo G. C. Neiva,
Sergio H. Domingues e Aldo J. G. Zarbin
Varying the experimental parameters in graphite oxidation and reduction of
graphene oxide produced graphene with different properties.
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Quim. Nova
1646 Final chlorine dioxide stage at near-neutral pH for bleaching
eucalyptus pulp
Robisnéa A. Ribeiro, Fernando J. B. Gomes, José N.
Floriani, Renato A. P. Damásio, Iara F. Demuner and
Jorge L. Colodette
The slow release of chlorous acid from chlorite results in efficient bleaching with
the minimal concentration of chlorate.
1650 Physico-chemical properties of meso-tetrakis(p-methoxyphenyl)porphyrin (TMPP) incorporated into Pluronic™
P-123 and F-127 polymeric micelles
Bruno H. Vilsinski, Jader L. Aparicio, Paulo C. de S.
Pereira, Silvia L. Fávaro, Katieli S. S. Campanholi, Adriana
P. Gerola, André L. Tessaro, Noboru Hioka and Wilker
Caetano
The spectroscopic properties of the photosensitizer compound meso-tetrakis(pmethoxyphenyl)porphyrin (TMPP), solubilized in biocompatible polymeric micelles
of PluronicTM surfactants P-123 and F-127, were analyzed for application in
photodynamic therapy (PDT).
1657 Estudo de catalisadores de níquel suportados em cinza de
casca de arroz na reforma de metano com dióxido de carbono
visando a produção de hidrogênio e gás de síntese
Karine Zanoteli, Jair C. C. Freitas e Paulo R. N. da Silva
Methane reforming with carbon dioxide, or dry reforming, is a promising
alternative that may lead to the reduction of CO2 emissions and the production
of a syngas with a lower ratio of H2/CO. In this work, nickel catalysts supported
on rice husk ash were used.
Revisão
1663 Noctuidae-induced plant volatiles: current situation and
prospects
Vanusa R.s Horas, Mario A. N. da Silva, Vinicius Annies,
Beatriz H. L. N. S. Maia, Francisco A. Marques and Mª
Fátima das G. F. da Silva
The aim of this contribution is to give an overview of the plant volatiles induced
by noctuids, as well as to present and discuss the methodologies used in the
induction of these volatiles, and the prospects involving this line of research
in pest control.
Vol. 37, No. 10
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1670 Cromatografia gasosa quiral na resolução de enantiômeros
envolvidos em flavours de frutas
Alexandre Porte, Luciana H. M. Porte e Luciana M. de
Oliveira
Fruit flavours comprise several enantiomers and enantioselective gas
chromatography can be a powerful tool to study these. Learn more in this review.
1680 O estado da arte da cromatografia líquida bidimensional:
conceitos fundamentais, instrumentação e aplicações
Noroska G. S. Mogollón, Paula F. de Lima, Mariana R.
Gama, Mayra F. Furlan, Soraia C. G. N. Braga, Paloma
S. Prata, Isabel C. S. F. Jardim e Fabio Augusto
This review focuses on theoretical, instrumental, and chemometric aspects of
comprehensive two-dimensional liquid chromatography and its use as a powerful
separation tool in complex sample analyses.
Nota Técnica
1692 Separação e determinação quantitativa dos alcanos lineares
e dos cíclicos/ramificados em petróleos brasileiros por aduto
de ureia e cromatografia gasosa: um estudo de caso revisitado
Elaine Marotta, Francisco R. de Aquino Neto e Débora
de A. Azevedo
A complete analysis of oil fractions allows correlations to be defined between
their composition and derivatives, generating products with high economic
value. Urea adduction was used to accurately separate linear and branched/
cyclic alkanes in Brazilian oils.
1699 Optimization of chromatographic conditions and comparison
of extraction efficiencies of four different methods for determination and quantification of pesticide content in bovine
milk by UFLC-MS/MS
Fabiano A. S. Oliveira, Fernando D. Madureira, Renata
P. Lopes, Marina G. Ferreira, Benito Soto-Blanco and
Marília M. Melo
This paper describes the optimizing chromatographic steps for multiresidue
determination of 20 pesticides in bovine milk using four different extraction
methods and a technique of UFLC-MS/MS.
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Educação
1707 Selective detection of fluoride based on a pyridinium N-phenolate-calix[4]pyrrole displacement assay: an undergraduate
laboratory experiment
Karina Mannrich, Marcelo Silva, Leandro G. Nandi, Celso
R. Nicoleti and Vanderlei G. Machado
Students synthesized calix[4]pyrrole (CP), a receptor that is highly selective
for F−, and a pyridinium N-phenolate dye. Subsequently, the students used the
synthesized compounds to investigate a displacement assay on the basis of the
competition between F− and the dye for CP.
1713 Catalyzed and non-catalyzed synthesis of bioactive Monastrol
Haline G. O. Alvim, Jose R. Correa, Taynara R. Machado,
Wender A. Silva and Brenno A. D. Neto
The bioactive 3,4-dihydropyrimidin-2(1H)-thione known as Monastrol is
synthesized. The manuscript compares the reaction under catalyzed and noncatalyzed conditions, highlighting the importance of catalysis and multicomponent
reactions.
1716 An undergraduate level experiment on the synthesis of Au
nanoparticles and their size-dependent optical and catalytic
properties
Anderson G. M. da Silva, Thenner S. Rodrigues, Alexandra
Macedo, Rafael T. P. da Silva and Pedro H. C. Camargo
The synthesis of Au NPs with controlled sizes is described as a laboratory
experiment covering concepts on the synthesis, stabilization, and characterization
of Au NPs, size-dependent optical/catalytic properties at the nanoscale, chemical
kinetics, and the role of a catalyst.
Assuntos Gerais
1721 Química na Poesia e Poesia na Química
W. Martin Wallau
The German novel “Elective Affinities” which transfers the chemical concept of
“Elective Attractions”, represented here by the affinity scheme between lime,
nitric and sulphuric acid, to social relations, is presented as an example for the
use of poetic means in science communication.
Carta ao Editor
1732 Comentários sobre o trabalho ‘Estimativa da incerteza
de medição: estudo de caso no ensaio de migração de
ε-caprolactama com determinação por CG-DIC’