JBCS

3:42, Thu Mar 30

Open Access/APCs

vol. 23, No. 9, 2012, p. 1577-1766

 

The Adventure and Beauty of Chemistry

Scientists need to urgently recover the beauty of science as well as preserve its quality.
Most of them are more concerned about indicators and numerical indexes than about the quality of the science they have been practicing itself.
The quality of a scientific article has currently been measured much more by the impact of the journal it has been published in than by its contribution to knowledge.

(Read more at Editorial)


Cover Article
J. Braz. Chem. Soc. 2012, 23(9), 1762-1766

Development of nanoinjector devices for electrospray ionization - tandem mass spectrometry (ESI-MSn)

Nilson A. Assunção; Ernesto S. Nakayasu; Sirlei Daffre; Emanuel Carrilho

How to cite this article

Technological dependence is a burden to most developing countries. To cover the gap of decades of developing high-end instrumentation is nearly impossible, but there is no reason why a BRIC country such as Brazil should maintain external dependence at all levels of an analytical determination. A thin double-layer titanium-gold film (< 200 nm) deposited on a tip of a mechanically pulled capillary tip (50 μm o.d. x 20 μm i.d.) makes a nanoinjector for mass spectrometry bioanalysis. See details on page 1762.

http://dx.doi.org/10.1590/S0103-50532012005000036

Published online: September 13, 2012

Editorial J. Braz. Chem. Soc. 2012, 23(9), 1577-1578

The Adventure and Beauty of Chemistry

Angelo C. Pinto

How to cite this article

 

http://dx.doi.org/10.1590/S0103-50532012000900001


Account J. Braz. Chem. Soc. 2012, 23(9), 1593-1579

Iron: a versatile element to produce materials for environmental applications

Ana Paula C. Teixeira; Juliana C. Tristão; Maria H. Araujo; Luiz C. A. Oliveira; Flávia C. C. Moura; José D. Ardisson; Camila C. Amorim; Rochel M. Lago

How to cite this article

 

Iron is a very versatile element to produce materials for environmental and technological applications. Iron oxides and composites with Fe0 show excellent activities for Fenton reaction and Cr(VI) reduction. Also, iron based magnetic adsorbents, recoverable catalysts and magnetic amphiphilic materials can be produced and used in a wide range of applications

http://dx.doi.org/10.1590/S0103-50532012005000039

Published online: September 21, 2012

Articles J. Braz. Chem. Soc. 2012, 23(9), 1594-1605

Adsorptive stripping voltammetry determination of the hormone therapy Raloxifene HCl in formulation and human serum

Mohamed M. Ghoneim; Amera. M. Hassanein; Nehal A. Salahuddin; Hanaa S. El-Desoky; Mona N. Elfiky

How to cite this article

 

Raloxifene HCl was reduced at hanging mercury dropping electrode (HMDE) in B-R universal buffer at various pH values via 2-electron single cathodic step due to reduction of its C=O group. Two precise linear sweep and square wave adsorptive cathodic stripping voltammetry methods are described for its trace quantitation in tablets and human serum

http://dx.doi.org/10.1590/S0103-50532012005000016

Published online: August 2, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1606-1613

Emission profiles of carbonyl compounds at a Brazilian charcoal plant

Daniela S. Anunciação; Eliane T. Sousa; Albertinho B. de Carvalho; Pedro A. P. Pereira

How to cite this article

 

Emission profiles of carbonyl compounds (CC) in the vapor phase were determined during the charcoal production from eucalyptus. Furfuraldehyde was the most abundant in all burning stages. The concentrations were generally up to five-fold lower at collection points more distant from the kilns than that found near the kilns

http://dx.doi.org/10.1590/S0103-50532012005000025

Published online: August 15, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1614-1622

An alternative method for the simultaneous determination of copper and lead for quality control of sugar cane spirit using a nanotube-based sensor

Elisângela de F. L. Tavares; Leonardo L. Okumura; Maria das Graças Cardoso; Marcelo F. de Oliveira; Zuy Maria Magriotis; Adelir A. Saczk

How to cite this article

 

Due to its high consumption, the search for quality control of sugar sugar cane is desirable. Therefore, this article presents an alternative method for the simultaneous analysis of contaminants copper and lead in this drink using a carbon paste electrode modified with carbon nanotubes and ascorbic acid

http://dx.doi.org/10.1590/S0103-50532012005000024

Published online: August 15, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1623-1629

Evaluation of sample preparation methods based on alkaline and acid solubilization for the determination of Na and K in meat samples by atomic spectrometric techniques

Caroline S. da Silva; Adriane M. Nunes; Eliézer Q. Oreste; Tanize S. Acunha; Mariana A. Vieira; Anderson S. Ribeiro

How to cite this article

 

Tetramethylammonium hydroxide and formic acid were used for sample preparation to determine Na and K in meat samples by atomic spectrometric techniques

http://dx.doi.org/10.1590/S0103-50532012005000023

Published online: August 15, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1630-1635

Preconcentration procedure using vortex agitator system for determination of trace levels of cadmium by flame atomic absorption spectrometry

Mahmoud Chamsaz; Mohammad Eftekhari; Atefe Atarodi; Saeid Asadpour; Maral Ariani

How to cite this article

 

Herein, it was used vortex assisted ionic liquid-microextraction as a new, simple and rapid method for preconcentration of cadmium and its determination by flame atomic absorption spectrometry

http://dx.doi.org/10.1590/S0103-50532012005000026

Published online: August 15, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1636-1646

Determination of volatiles in pharmaceutical certified reference materials

Raquel Nogueira; Suzane M. Queiroz; Gisele E. B. Silva; Werickson F. C. Rocha; Gabriel F. Sarmanho; Renato R. R. Almeida; Gabriela F. Moreira

How to cite this article

 

This work compares the volatiles content in certified reference materials (CRM) of active pharmaceutical ingredients (API) determined by loss on drying, Karl Fischer coulometric titration, and sHS-GC-FID, TGA and ATR-NIR-chemometrics

http://dx.doi.org/10.1590/S0103-50532012005000021

Published online: August 15, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1647-1656

Essential oil composition of Eugenia langsdorffii O. Berg.: relationships between some terpenoids and toxicity against Tetranychus urticae

Marcílio M. de Moraes; Claudio A. G. da Camara; Maria L. dos Santos; Christopher W. Fagg

How to cite this article

 

The Eugenia langsdorffii essential oil had pronounced fumigant activity against Tetranychus urticae, higher than the residual contact toxicity. Amongst the leaf oil components assayed, major toxicity was observed for the blend limonene, p-cymene and valencene, which exhibited fumigant property superior to the leaf oil

http://dx.doi.org/10.1590/S0103-50532012005000029

Published online: August 22, 2012


J. Braz. Chem. Soc. 2012, 23(9), 1657-1662

Effect of PECVD deposition parameters on the DLC/PLC composition of a-C:H thin films

Éder C. Oliveira; Sandra A. Cruz; Paulo H. L. Aguiar

How to cite this article

 

Atomic force microscopic (AFM) images of a-C:H films synthesized by plasma enhanced chemical deposition process (PECVD) showing that the pressure in the chamber and the acetylene partial pressure in argon influence the morphology

http://dx.doi.org/10.1590/S0103-50532012005000027

Published online: August 24, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1663-1668

Synthesis of novel quinolines using TsOH/ionic liquid under microwave

Liziê D. T. Prola; Lilian Buriol; Clarissa P. Frizzo; Guilherme S. Caleffi; Mara R. B. Marzari; Dayse N. Moreira; Helio G. Bonacorso; Nilo Zanatta; Marcos A. P. Martins

How to cite this article

 

The reaction of 4-alkoxy-3-alken-2-ones with 2-aminoacetophenone to obtain a series of 3-haloacetyl-4-methylquinolines is described for the first time

http://dx.doi.org/10.1590/S0103-50532012005000030

Published online: August 28, 2012


J. Braz. Chem. Soc. 2012, 23(9), 1669-1679

Evaluation of trace metal levels in surface sediments of the Sergipe River Hydrographic Basin, Northeast Brazil

Aldair F. Silva; George R. S. Lima; Jeferson C. Alves; Samir H. Santos; Carlos A. B. Garcia; J. Patrocinio H. Alves; Rennan G. O. Araujo; Elisangela A. Passos

How to cite this article

 

The distributions of Co, Cr, Cu, Mn, Ni, Pb, Fe and Al were investigated in surface sediments collected at 19 sites in the Sergipe River Hydrographic Basin of Northeast Brazil

http://dx.doi.org/10.1590/S0103-50532012005000028

Published online: August 30, 2012


J. Braz. Chem. Soc. 2012, 23(9), 1680-1687

Stripped sour water treatment by advanced oxidation processes

José R. Guimarães; Mirthys C. Gasparini; Milena G. Maniero; Carlos G. N. Mendes

How to cite this article

 

Photolysis (UV), peroxidation (H2O2), peroxidation combined with ultraviolet light (UV/H2O2), Fenton's reagent (H2O2/Fe(II)) and photo-Fenton (H2O2/Fe(II)/UV) processes were applied for the treatment of stripped sour water from the Replan Oil Refinery (Paulínia City, São Paulo State, Brazil)

http://dx.doi.org/10.1590/S0103-50532012005000031

Published online: August 30, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1688-1697

The influence of conventional heating and microwave irradiation on the resolution of (RS)-sec-butylamine catalyzed by free or immobilized lipases

Cristiane Pilissão; Patrícia de Oliveira Carvalho; Maria da Graça Nascimento

How to cite this article

 

The enzymatic resolution of (RS)-sec-butylamine was studied. The reactions were carried out under conventional heating (CH) and microwave (MW) irradiation. Best results were achieved using A. niger lipase immobilized in starch films under MW conditions

http://dx.doi.org/10.1590/S0103-50532012005000033

Published online: September 4, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1698-1703

Determination of ecstasy components in human urine by gas chromatography using a dispersive liquid-liquid microextraction procedure

Hossein Ali Mashayekhi; Mohammad Rezaee

How to cite this article

 

This study has demonstrated the successful application of DLLME-GC-FID method for the determination of ecstasy components in urine samples. The experimental results reveal that this method provides low LOD and good linearity

http://dx.doi.org/10.1590/S0103-50532012005000032

Published online: September 6, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1704-1711

Multivariate optimization of microwave-assisted digestion of copper and zinc from powder milk

Mostafa Khajeh

How to cite this article

 

Pareto chart of main effects obtained from 24 full factorial designs. The vertical line defines the 95% confidence interval (A: power, B: temperature, C: time and D: volume of nitric acid)

http://dx.doi.org/10.1590/S0103-50532012005000038

Published online: September 11, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1711-1718

Influence of seasonality on the interaction of mercury with aquatic humic substances extracted from the Middle Negro River Basin (Amazon)

Luciana C. de Oliveira; Wander G. Botero; Felipe A. Santos; Ézio Sargentini Jr.; Julio C. Rocha; Ademir dos Santos

How to cite this article

 

The objective of this work was to investigate seasonal influences on the interaction of mercury with aquatic humic substances, which are the main natural organic complexation agents

http://dx.doi.org/10.1590/S0103-50532012005000034

Published online: September 11, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1719-1731

Environmental dynamics of pesticides in the drainage area of the São Lourenço River headwaters, Mato Grosso State, Brazil

Karen P. Casara; Antonio B. Vecchiato; Carolina Lourencetti; Alicio A. Pinto; Eliana F. G. C. Dores

How to cite this article

 

Study area photo showing cotton plantation proximity to the water course. Water movement in the soil was found to influence the pesticide migration on and through soil. Runoff, leaching and wet precipitation were found to be important pathways to the water contamination

http://dx.doi.org/10.1590/S0103-50532012005000037

Published online: September 13, 2012


J. Braz. Chem. Soc. 2012, 23(9), 1732-1740

Multivariate optimization of analytical methodology and a first attempt to an environmental risk assessment of β-blockers in hospital wastewater

Marcelo L. Wilde; Klaus Kümmerer; Ayrton F. Martins

How to cite this article

 

Development of analytical methodology and risk assessment of β-blockers contamination by discharge of hospital wastewater in the environment

http://dx.doi.org/10.1590/S0103-50532012005000035

Published online: September 13, 2012


J. Braz. Chem. Soc. 2012, 23(9), 1741-1746

Theoretical study of thermochemical properties using composite methods adapted to ONIOM

Gabriel Heerdt; Nelson H. Morgon

How to cite this article

 

A two-layered ONIOM approach was employed to study the proton and electron affinities for a group of 50 molecules. The methodology ONIOM2(QCISD(T)/6-311++G(2df,p):HF/6-31g(d))// ONIOM2(B3LYP/6-31g(d):HF/6-31g(d)) provided the best comparison with the experimental data

http://dx.doi.org/10.1590/S0103-50532012005000041

Published online: September 18, 2012


J. Braz. Chem. Soc. 2012, 23(9), 1747-1755

A multivariate statistical analysis of the QSAR of 2-(substituted phenyl)indan-1,3-diones with hypolipidemic activity

Aluizio G. da Silva; Mozart N. Ramos

How to cite this article

 

New derivatives of 2-(substituted phenyl)indan-1,3-diones were predicted by QSAR (quantitative structure-activity relationship) studies, along with empirical parameters. These compounds are potential candidates for new experimental screening studies for reducing serum cholesterol and triglyceride levels

http://dx.doi.org/10.1590/S0103-50532012005000040

Published online: September 21, 2012

J. Braz. Chem. Soc. 2012, 23(9), 1756-1761

Differentiation of five pine species cultivated in Brazil based on chemometric analysis of their volatiles identified by gas chromatography-mass spectrometry

Francisco A. Marques; Gustavo Frensch; Scheila R. M. Zaleski; Noemi Nagata; Beatriz H. L. N. Sales Maia; Sonia M. N. Lazzari; Cesar A. Lenz; Arlene G. CorrÛa

How to cite this article

 

The volatiles emitted by branches from five species of pines were collected by aeration and analyzed by GC-FID and GC-MS. The relative composition of the volatiles was used to perform a discriminating analysis of the pine species

http://dx.doi.org/10.1590/S0103-50532012005000042

Published online: September 21, 2012


Short Reports J. Braz. Chem. Soc. 2012, 23(9), 1762-1766

Development of nanoinjector devices for electrospray ionization - tandem mass spectrometry (ESI-MSn)

Nilson A. Assunção; Ernesto S. Nakayasu; Sirlei Daffre; Emanuel Carrilho

How to cite this article

 

In this work, we developed a method for pulling the capillary tips and methodology for the deposition of metallic films onto glass-based surfaces (borosilicate and fused silica). This was applied to make nanoinjectors for direct injection of samples using MS without a separation the components of the sample

http://dx.doi.org/10.1590/S0103-50532012005000036

Published online: September 13, 2012

Online version ISSN 1678-4790 Printed version ISSN 0103-5053
Journal of the Brazilian Chemical Society
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