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Saiu o JBCS número 12 - Volume 22

Este número especial do Journal of the Brazilian Chemical Society é dedicado ao XXIX Congresso Latino Americano de Química CLAQ 2010, que ocorreu em Cartagena de Indias, Colômbia, de 27 setembro a 1 outubro de 2010. O evento é uma atividade da Federación Latinoamericana de Asociaciones Químicas-FLAQ e foi organizado pelas seguintes instituições: ASQUIMCO, a Sociedad Colombiana de Ciencias Químicas - SCCQ, a Universidad de Cartagena e da Universidad Nacional de Colombia.

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Fonte: Editoria do JBCS

Table of Contents with Graphical Abstracts

>> Editorial(220 KB)
XXIX Latin American Congress of Chemistry
Fabián Parada-Alfonso, Jailson B. De Andrade and Norberto Peporine Lopes
J. Braz. Chem. Soc. 2011, 22, 2239.


Molecular Interactions of Mefenamic Acid with Lipid Bilayers and Red Blood Cells
Mario Suwalsky, Marcela Manrique-Moreno, Jörg Howe, Klaus Brandenburg and Fernando Villena
J. Braz. Chem. Soc. 2011, 22, 2243.
Mefenamic acid is a nonsteroidal anti-inflammatory drug, also prescribed to treat pain. In the present work, the structural effects on both human erythrocyte membrane and molecular models have been investigated
>> PDF (948 KB)
Web Release date: July 7, 2011.

Searching of Protein Targets for Alpha Lipoic Acid

Wilson Maldonado-Rojas, Jesus Olivero-Verbel and Carlos Ortega-Zuñiga

J. Braz. Chem. Soc. 2011, 22, 2250.
The alpha lipoic acid has the potential to interact with mammalian proteins that are involved in several diseases, probably acting as a weak inhibitor for the biological activity of these proteins. The image shows the binding site for R-ALA in 1HS6, 1ZSX, 1Q5M and 1CQZ
>> PDF (2,07 MB)
Web Release date: July 14, 2011.

Alkaline Reactivity of Arsenical Natrojarosite

Iván A. Reyes, Francisco Patiño, Isauro Rivera, Mizraím U. Flores, Martín Reyes and Juan Hernández

J. Braz. Chem. Soc. 2011, 22, 2260.
The experimental results of the alkaline decomposition of arsenical natrojarosite are consistent with the kinetic model of decreasing core for spherical particles and chemical control
>> PDF (990 KB)
Web Release date: August 16, 2011.

DFT-GIAO Calculation of Properties of 19F NMR and Stability Study of Environmentally Relevant Perfluoroalkylsulfonamides (PFASAmide)

Rafael Mejía-Urueta, Kleyber Mestre-Quintero and Ricardo Vivas-Reyes

J. Braz. Chem. Soc. 2011, 22, 2268.
The image shows the identification of atoms of fluor according to the position of the carbons in the molecules of perfluoroalkylsulfonamides
>> PDF (2,08 MB)
Web Release date: August 23, 2011.

Principal Component Analysis of Changes due to Water Stress for Some Osmolytes, Pigments and Antioxidant Enzymes in Gmelina arborea Robx. Leaves from Trees Planted in Northern Colombia

Sandra C. Crespo, Andres L. Moreno-Chacón, Andrea Rojas and Luz M. Melgarejo

J. Braz. Chem. Soc. 2011, 22, 2275.
Total sugar, reducing sugar, proline, carotenoids, chlorophyll content and catalase, peroxidase and ascorbate peroxidase activities measured in the leaves of G. arborea Robx trees planted in Northern Colombia were used as descriptors for principal component analysis. The score plot establishes the presence of three groups corresponding to season (rainy season, transition to dry season and dry season) and three age-related groups (seedling, juvenile and adult)
>> PDF (287 KB) / >> Supplementary Information (196 KB)
Web Release date: August 30, 2011.

Polar Compounds Isolated from the Leaves of Calea prunifolia H.B.K. and their Anti-Adrenergic Related Vasodilator Activity

Pilar Puebla, Nataly Aranguren, Javier Rincón, Maritza Rojas, Mario Guerrero and
Arturo San Feliciano

J. Braz. Chem. Soc. 2011, 22, 2281.

From the leaves of Calea prunifolia H.B.K, one new kaurane diterpenoid glycoside was isolated. Their chemical structure was elucidated on the basis of spectral analysis, including HRMS, 1D- and 2D-NMR data

>> PDF (215 KB) / >> Supplementary Information (785 KB)
Web Release date: September 6, 2011.

Study of Growth, Optical and Morphological Properties of Zn(O;OH)S Thin Films Synthesized by CBD Method

W. Vallejo, E. Romero and G. Gordillo

J. Braz. Chem. Soc. 2011, 22, 2286.
In this work, Zn(O;OH)S was investigated as substitute for CdS, which is conventionally used as buffer layer in chalcopyrite based solar cells
>> PDF (707 KB)
Web Release date: September 6 2011.

Chemical and Spectroscopic Characterization of a Vegetable Oil used as Dielectric Coolant in Distribution Transformers

Neffer A. Gomez, Rodrigo Abonia, Hector Cadavid and Ines H. Vargas

J. Braz. Chem. Soc. 2011, 22, 2292.

A complete spectroscopic analysis was performed on a FR3® oil sample used as dielectric coolant in an experimental distribution transformer. This result along with the spectroscopic analysis of its chemical transformation products (i.e. soap, hydrogenated and accelerated aging products, free fatty acid and biodiesel) afforded valuable structural information about the FR3® oil sample to search for a spectroscopy-based technique for monitoring the life-time and performance of this dielectric oil

>> PDF (0,97 MB) / Supplementary Information (433 KB)
Web Release date: September 8, 2011.

Effect of the Molecular Weight on the Physicochemical Properties of Poly(lactic acid) Nanoparticles and on the Amount of Ovalbumin Adsorption

Juliana Palacio, Víctor H. Orozco and Betty L. López

J. Braz. Chem. Soc. 2011, 22, 2304.
Poly(lactic acid) (PLA) nanoparticles with high (PLAHMW) and low (PLAHMW) molecular weights were prepared to study the effect of PLA molecular weight on the particle size, ξ-potential and the amount of adsorbed ovalbumin (OVA)
>> PDF (359 KB)
Web Release date: September 13, 2011.

Contribution to the Study of the Formation Mechanism of Ordered Porous Carbons from a Soft-Template Method using the Copolymer Triblock (PEO140PPO39PEO140) and a Phenolic Resin

Cristiam F. Santa and Ligia Sierra

J. Braz. Chem. Soc. 2011, 22, 2312.
In the synthesis of mesoporous carbons trough the self-assembly of a Pluronic® surfactant and a phenolic resin in an alkaline medium, two competitive mechanisms are present. The first one is as the micelles covering mechanism reported in literature for the SBA-16 silica particle synthesis and the second one corresponds to the formation of resol particles. The covering of the micelles must be stable enough to form mesoporous carbons
>> PDF (0,99 MB)
Web Release date: September 20, 2011.

Palladium Nanoparticles Supported on Layered Hydroxide Salts and their Use in
Carbon-Carbon Coupling Organic Reactions

Maby Martínez, Rogelio Ocampo, Luz Amalia Rios, Alfonso Ramírez and Oscar Giraldo

J. Braz. Chem. Soc. 2011, 22, 2322.
The small balls represent nanoparticles of metal palladium supported on layered hydroxide salt, catalyzing Suzuki and Heck C-C coupling reactions
>> PDF (0,99 MB)
Web Release date: September 20, 2011.

Optimization of the HS-SPME Technique by using Response Surface Methodology for Evaluating Chlorine Disinfection by-Products by GC in Drinking Water

Mauricio Aguirre-González, Gonzalo Taborda-Ocampo, Carmen Dussan-Lubert, Cristina Nerin
and Milton Rosero-Moreano

J. Braz. Chem. Soc. 2011, 22, 2330.
The response surface methodology has been used to improve and optimize the critical conditions to reach partitioning equilibrium among the three phases implicated in this solventless microextraction technique SPME: gas (headspace), liquid (sample) and solid (fiber) for the assessment of THMs in drinking water
>> PDF (500 KB)
Web Release date: October 6, 2011.

Enzymatic Hydrolysis of Cassava Starch for Production of Bioethanol with a Colombian Wild Yeast Strain

Mónica I. Ruiz, Clara I. Sanchez, Rodrigo G. Torrres and Daniel R. Molina

J. Braz. Chem. Soc. 2011, 22, 2337.
Starch hydrolysis by two different methodologies. In the first one, two consecutive steps: liquefaction and saccharification. The second one, a simultaneous liquefaction and saccharification starch. Finally, alcohol production with a wild strain of Candida sp.
>> PDF (480 KB)
Web Release date: October 20, 2011.

Chemistry and Bioactivity of Haplopappus remyanus (“bailahuen”), a Chilean Medicinal Plant

Francesca Faini, René Torres, Jesús M. Rodilla, Cecilia Labbé, Carla Delporte and Fabián Jaña

J. Braz. Chem. Soc. 2011, 22, 2344.
The leaves of this Chilean medicinal shrub produce high yields of resinous exudate, with relevant anti-inflammatory, cytotoxic and antioxidant activity. Known flavonoids and a unique type of α-terpineol derivatives, were the main compounds detected in the extract. Their bioactivity has yet to be established
>> PDF (265 KB) / Supplementary Information (698 KB)
Web Release date: October 27, 2011.

Determination of Acidic Herbicides in Water Samples by In Situ Derivatization, Single Drop Microextraction and Gas Chromatography-Mass Spectrometry

Lilia Araujo, Avismelsi Prieto, María Troconis, Grilena Urribarri, Williams Sandrea and
Jair Mercado

J. Braz. Chem. Soc. 2011, 22, 2350.
A new analytical method for the determination of acidic herbicides in water samples is described. The analytical procedure involves in situ derivatization of analytes to their methyl esters with dimethyl sulfate, sampling using single drop microextraction (SDME) and gas chromatography-mass spectrometry (GC-MS)
>> PDF (265 KB)
Web Release date: October 27, 2011.

Production of Indole-3-Acetic Acid in the Culture Medium of Microalga Scenedesmus obliquus (UTEX 393)

Rosa E. P. Correa, Nancy M. C. Castro, Andrés M. M. Jaramillo and Gloria E. González-Mariño

J. Braz. Chem. Soc. 2011, 22, 2355.
HPLC identification of IAA in green microalga S. obliquus culture medium
>> PDF (556 KB)
Web Release date: November 8, 2011.

Electrochemical Detection of Arsenite with Silver Electrodes in Inorganic Electrolyte and Natural System Mixtures

María del C. Aguirre, Bernabe L. Rivas, Luiz Basáez and Carlos Peña-Farfal

J. Braz. Chem. Soc. 2011, 22, 2362.

Cyclic voltammograms of silver wire electrode (SWE) in drinking water, up to 200 mg L-1 As(III) concentration (scan rate of 20 mV s-1)

>> PDF (1,58 MB)
Web Release date: November 10, 2011.

Chemometric Analysis of ESI and NMR Data from Piper Species

Lydia F. Yamaguchi, Giovana C. Freitas, Nidia C. Yoshida, Renata A. Silva, Anderson M. Gaia, Adalberto M. Silva, Marcus T. Scotti, Vicente de P. Emerenciano, Elsie F. Guimarães, Eny I. S. Floh, Carlos A. Colombo, Walter J. Siqueira and Massuo J. Kato

J. Braz. Chem. Soc. 2011, 22, 2371.
PCA scores plot based on NMR and ESIMS data applied to Piper species discriminated those containing typical secondary metabolites
>> PDF (1,87 MB) / >> Supplementary Information (571 KB)
Web Release date: December 6, 2011.

Integrated Utilization of Guava (Psidium guajava L.): Antioxidant Activity of Phenolic Extracts Obtained from Guava Seeds with Supercritical CO2-Ethanol

Mile A. Hernández-Acosta, Henry I. Castro-Vargas and Fabián Parada-Alfonso

J. Braz. Chem. Soc. 2011, 22, 2383.
The antioxidant activity from some guava seed extracts and fractions was evaluated. Extracts were obtained using supercritical fluid extraction. The best extract and the best fraction were tested as edible oil antioxidant
>> PDF (337 KB)
Web Release date: December 6, 2011.


Topical Anti-Inflammatory Activity of Calea prunifolia HBK (Asteraceae) in the TPA Model of Mouse Ear Inflammation

Milton Gómez and Juan F. Gil

J. Braz. Chem. Soc. 2011, 22, 2391.
The figure shows flowers of Calea prunifolia HBK (Asteraceae) and molecules isolated from them
>> PDF (197 KB) / >> Supplementary Information (735 KB)
Web Release date: September 6, 2011.

Microwave-Assisted Synthesis under Solvent-Free Conditions of

Jorge E. Trilleras, Kelly J. Velasquez, Dency J. Pacheco, Jairo Quiroga and Alejandro Ortíz

J. Braz. Chem. Soc. 2011, 22, 2396.
The microwave irradiation synthesis under solvent-free conditions of (E)-2-(benzo[d]thiazol-2-yl)-3-arylacrylonitriles by Knoevenagel condensation is described. The configuration of the acrylonitrile double bond could not be established by NMR methods. However, theoretical studies have shown that the E isomer is more stable than Z, which is in good agreement with some experimental evidences
>> PDF (587 KB) / >> Supplementary Information (1,77 MB)
Web Release date: September 6, 2011.

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