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6/9/2012


Saiu o JBCS número 8 - Volume 23



There Is No Future without Good Primary Education

"Water dropping day by day wears the hardest rock away". This popular saying should enlighten and guide the actions of all those comitted to improving the educational level and reducing truancy in Brazilian schools. Sometimes, we seem to forget that from 100 students who start primary school, 44 make it to high school and only 12 go to college. Still worse is the fact that from those 12, not all manage to graduate and many exceed the regular periods of their courses.

(Read more at Editorial)


Table of Contents with Graphical Abstracts




COVER ARTICLE

Iron(III) Porphyrin Covalently Supported onto Magnetic Amino-Functionalized
Nanospheres as Catalyst for Hydrocarbon and Herbicide Oxidations
Joicy S. dos Santos, André L. Faria, Patrícia M. da Silva Amorin, Franco M. La Luna, Kely L. Caiado, Débora O. C. e Silva, Patrícia P. C. Sartoratto and Marilda D. Assis

This work describes a new magnetic catalyst composed of an ironporphyrin, 5,10,15,20-tetrakis(pentafluorophenyl) porphyrin iron(III) chloride, FeTFPP, covalently immobilized onto magnetic maghemite nanospheres covered with aminofunctionalized silica. The catalyst can be easily recovered and washed after reaction through application of an external magnetic field, which favors its reuse. This catalytic system proved to be efficient and selective for hydrocarbon oxidation, specially R(+)-limonene, a compound present in orange peels and in the herbicide simazine, frequently used on sugar cane crops. Details are discussed on page 1411.


>> Editorial(319 KB)
There Is No Future without Good Primary Education
Angelo C. Pinto
J. Braz. Chem. Soc. 2012, 23, 1409

ARTICLES

Iron(III) Porphyrin Covalently Supported onto Magnetic Amino-Functionalized
Nanospheres as Catalyst for Hydrocarbon and Herbicide Oxidations
Joicy S. dos Santos, André L. Faria, Patrícia M. da Silva Amorin, Franco M. La Luna, Kely L. Caiado, Débora O. C. e Silva, Patrícia P. C. Sartoratto and Marilda D. Assis
J. Braz. Chem. Soc. 2012, 23, 1411



This work describes the covalent immobilization of an ironporphyrin, 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin iron(III) chloride (FeTFPP), onto maghemite/silica magnetic nanospheres covered with aminofunctionalized silica and its use as catalyst for hydrocarbon and herbicide (simazine) oxidations
>> PDF (718 KB)
DOI S0103-50532012005000005 Published online: July 3, 2012

Comparison of Different Pre-treatment Procedures for the Determination of
Chromium in Crude Oil Samples by GF AAS
Helen M. Pessoa, Fernanda H. Lyra, Eustáquio Vinicius R. de Castro, Reinaldo C. de Campos,
Maria Tereza W. D. Carneiro and Geisamanda P. Brandão
J. Braz. Chem. Soc. 2012, 23, 1421

Cr absorption signal obtained by DS-GF AAS of 0.760 mg of crude oil sample without pre-treatement (red - Cr atomic absorption signal; blue - background signal)
>> PDF (310 KB)
DOI S0103-50532012005000004 Published online: July 3, 2012

PAHs in Cultured Mussels Perna perna from a Southeastern Brazilian Bay
Renato V. Yoshimine and Renato S. Carreira
J. Braz. Chem. Soc. 2012, 23, 1429

The occurrence of polycyclic aromatic hydrocarbons (PAHs) in mussels (Perna perna) cultured in farms from the Ilha Grande Bay (Rio de Janeiro State, Brazil) was evaluated for the first time. The levels of PAHs were generally low and below the threshold concentrations recommended for human consumption of shellfish. The results also revealed reasonable good local environmental conditions
>> PDF (406 KB) / Supplementary Information (279 KB)
DOI S0103-50532012005000003 Published online: July 5, 2012

Lanthanide Nitrates as Lewis Acids in the One-Pot Synthesis of
1,2,4-Oxadiazole Derivatives
Juliana A. Vale, Wagner M. Faustino, Davila de S. Zampieri, Paulo J. S. Moran, José A. R. Rodrigues and Gilberto F. de Sá
J. Braz. Chem. Soc. 2012, 23, 1437

Lanthanide nitrates [Ln(NO3)3] acting as catalyst in direct one-pot synthesis of 3-benzoyl- and 3-acetyl-1,2,4-oxadiazoles derivatives from aromatic ketones with electron-donating (EDG) and electron-withdrawing groups (EWG)
>> PDF (288 KB) / Supplementary Information (573 KB)
DOI S0103-50532012005000002 Published online: July 5, 2012

Simultaneous Quantification of Lycopene, β-Carotene, Retinol and α-Tocopherol in Plasma after a Simple Extraction Procedure: Stability Study and Application to Human Volunteer
Mariele F. Charão, Angela M. Moro, Natália Brucker, Rachel P. Bulcão, Marília Baierle,
Fernando Freitas, Juliano Durgante, Sabrina Nascimento, Guilherme B. Bubols,
Paulo H. Saldiva, Denise Bohrer and Solange C. Garcia
J. Braz. Chem. Soc. 2012, 23, 1441
The described method consists of a rapid and simple liquid-liquid extraction procedure and posterior quantification by high-performance liquid chromatography (HPLC) with Vis/fluorescence detection. It was shown to be a sensitive method for the simultaneous determination of lycopene, β-carotene, retinol and α-tocopherol in human plasma and can be utilized in routines of clinical laboratories
>> PDF (726 KB)
DOI S0103-50532012005000001 Published online: July 10, 2012

Kinetic Analytical Method for Determination of Uric Acid in Human Urine using
Analyte Pulse Perturbation Technique
Natasa D. Pejic, Jelena P. Maksimovic, Slavica M. Blagojevic, Slobodan R. Anic, Zeljko D. Cupic and Ljiljana Z. Kolar-Anic
J. Braz. Chem. Soc. 2012, 23, 1450



The kinetic methods based on the potentiometric monitoring of the concentration perturbations of the both the Bray-Liebhafsky oscillatory reaction in a stable non-equilibrium stationary state and Dushman reaction in a steady state, are described. The methods are utilized for determination of uric acid in human urine samples
>> PDF (471 KB)
DOI S0103-50532012005000006 Published online: July 12, 2012

Optimization of an Analytical Protocol for the Extraction, Fractionation and
Determination of Aromatic and Aliphatic Hydrocarbons in Sediments
Vânia R. Ferreira, Cindy D. Gouveia, Cesar A. da Silva, Andreia N. Fernandes and Marco T. Grassi
J. Braz. Chem. Soc. 2012, 23, 1460
PAH concentrations recovered from certified reference sediment (NWRI EC-3). Vertical bars represent the standard deviation (n = 3) for the recovered and for the certified values (n = 3)
>> PDF (480 KB)
DOI S0103-505320120050000010 Published online: July 12, 2012

Spectrophotometric Evaluation of the Behavior of Disperse Red 1 Dye in Aqueous
Media and its Interaction with Calf Thymus ds-DNA
Carolina V. Uliana, Gustavo S. Garbellini and Hideko Yamanaka
J. Braz. Chem. Soc. 2012, 23, 1469



Studies of the solubility of the model dye disperse red 1 (DR1) in aqueous solutions, its determination in water samples and the interaction of the dye with calf thymus ds-DNA were performed using UV-Vis spectrophotometry
>> PDF (505 KB)
DOI S0103-50532012005000009 Published online: July 12, 2012

Currently Used Pesticides in Water Matrices in Central-Western Brazil
Elisângela N. Nogueira, Eliana F. G. C. Dores, Alício A. Pinto, Ricardo S. S. Amorim, Maria L. Ribeiro and Carolina Lourencetti
J. Braz. Chem. Soc. 2012, 23, 1476.



Currently used pesticides in water matrices in Central-Western Brazil reveal a higher diversity of compounds and frequency of detection in rain water than in surface and groundwater samples and point to the risk of pesticide contamination in important headwater streams in the study areas
>> PDF (1.02 MB) / Supplementary Information (197 KB)
DOI S0103-50532012005000008 Published online: July 12, 2012

Anionic Chromogenic Chemosensors Highly Selective for Fluoride or Cyanide Based on 4-(4-Nitrobenzylideneamine)phenol
Celso R. Nicoleti, Vanderléia G. Marini, Lizandra M. Zimmermann and Vanderlei G. Machado
J. Braz. Chem. Soc. 2012, 23, 1488
4-(4-Nitrobenzylideneamine)phenol is used in the study of anionic chromogenic chemosensors in acetonitrile allowing the highly selective detection of F- and CN-. These chemosensors are based on acid-base and on indicator displacement strategies
>> PDF (1.54 MB) / Supplementary Information (781 KB)
DOI S0103-50532012005000007 Published online: July 12, 2012

Comparison of the n-Alkanes and Polycyclic Aromatic Hydrocarbons Concentrations in the Atmosphere during the Preparation of Warm and Hot Mixtures Asphalt for Pavements
Rosângela Motta, Pérola C. Vasconcellos, Liedi Bernucci, Simone G. Ávila and Talita Cornetti
J. Braz. Chem. Soc. 2012, 23, 1501



Warm mix asphalt (WMA) is a new paving technology produced with temperature around
30 °C lower than conventional hot mix asphalt (HMA). Due to the reduction of temperature, less n-alkanes and polycyclic aromatic hydrocarbons (PAH) are generated during the production of WMA than HMA
>> PDF (400 KB)
DOI S0103-505320120050000011 Published online: July 19, 2012

Quantitative Chemical Profile and Multivariate Statistical Analysis of Alembic Distilled Sugarcane Spirit Fractions
Felipe A. T. Serafim, Carlos A. Galinaro, Alexandre A. da Silva, Silmara F. Buchviser,
Eduardo S. P. do Nascimento, Fernando V. Novaes and Douglas W. Franco
J. Braz. Chem. Soc. 2012, 23, 1506

During the alembic distillation process, the sugarcane spirit is separated into three different fractions which presented differences among their quantitative chemical profile. In this work was suggested a quantitative chemical model for it in order to support the standardization of this production step
>> PDF (705 KB) / Supplementary Information (594 KB)
DOI S0103-505320120050000015 Published online: July 19, 2012

A LED Based Photometer for Solid Phase Photometry: Zinc Determination in
Pharmaceutical Preparation Employing a Multicommuted Flow Analysis Approach
Tuanne R. Dias and Boaventura F. Reis
J. Braz. Chem. Soc. 2012, 23, 1515



A LED (light emitting diode) based photometer for solid phase photometry coupled to a multi-commuted flow analysis approach forming a downsized setup that is designed for zinc determination in pharmaceutical products
>> PDF (484 KB)
PDOI S0103-505320120050000014 Published online: July 19, 2012

Synthesis, Electrochemical, Spectrophotometric and Potentiometric Studies of
Two Azo-Compounds Derived from 4-Amino-2-Methylquinoline in Ethanolic-Aqueous Buffered Solutions
Mona A. El-Attar, Iqbal M. Ismail and Mohamed M. Ghoneim
J. Braz. Chem. Soc. 2012, 23, 1523

Two azo-compounds derived from 4-amino-2-methylquinoline were synthesized and characterized. Their electrode reaction pathways were elucidated and discussed. Dissociation and stability constants of the examined azo-derivatives and stoichiometry of their complexes with some transition metal ions were determined
>> PDF (736 KB) / Supplementary Information (437 KB)
DOI S0103-505320120050000013 Published online: July 31, 2012

A Peroxotungstate-Ionic Liquid Brush Assembly: an Efficient and Reusable Catalyst for Selectively Oxidizing Sulfides with Aqueous H2O2 Solution in Neat Water
Xianying Shi, Wenjuan Ma, Hui Ou, Xiaoyan Han, Congmin Lu, Yan Chen and Junfa Wei
J. Braz. Chem. Soc. 2012, 23, 1536



An environmentally-friendly procedure was developed for selective oxidation of sulfides at room temperature using 30 wt.% hydrogen peroxide as terminal oxidant and water as sole solvent. The catalyst is easily recovered post-reaction (via simple filtration) and reused at least eight times without a noticeable loss of activity
>> PDF (430 KB) / Supplementary Information (632 KB)
DOI S0103-505320120050000012 Published online: July 31, 2012

Kinetics and Mechanism of Chlorate-Chloride Reaction
Rafaela T. P. Sant'Anna, Cristina M. P. Santos, Guilherme P. Silva, Ricardo J. R. Ferreira,
André P. Oliveira, Carlos E. S. Côrtes and Roberto B. Faria
J. Braz. Chem. Soc. 2012, 23, 1543
A saturation profile for chloride concentration was found in a kinetic study for the chlorate-chloride reaction, suggesting the formation of Cl2O32- intermediate. The proposed mechanism was able to reproduce the experimental behavior
>> PDF (476 KB)
DOI S0103-505320120050000017 Published online: July 31, 2012

Evaluation of Herbicidal Potential of Depsides from Cladosporium uredinicola,
an Endophytic Fungus Found in Guava Fruit
Lívia S. de Medeiros, Olívia M. Sampaio, Maria Fátima das G. F. da Silva, Edson Rodrigues Filho
and Thiago André M. Veiga
J. Braz. Chem. Soc. 2012, 23, 1551



Two natural depsides, 2,4-dihydroxy-3,6-dimethylbenzoate (1) and 3-hydroxy-2,5-dimethylphenyl 4-[(2,4-dihydroxy-3,6-dimethylbenzoyl)oxy]-2-hydroxy-3,6-dimethylbenzoate (2), were isolated from Cladosporium uredinicola and their effects on various steps of photosynthesis were investigated
>> PDF (465 KB)
DOI S0103-505320120050000018 Published online: August 2, 2012

Cytotoxic Cordiaquinones from the Roots of Cordia polycephala
Hozana Patrícia S. Freitas, Ana Isabel V. Maia, Edilberto R. Silveira, José Delano B. Marinho Filho, Manoel O. Moraes, Cláudia Pessoa, Letícia V. Costa Lotufo and Otília Deusdênia L. Pessoa
J. Braz. Chem. Soc. 2012, 23, 1558



The chemical investigation of the roots of Cordia polycephala resulted in the isolation of two new terpenoid naphtoquinones, named as cordiaquinones N and O. Both compounds showed cytotoxic effects with IC50 values in the range of 1.2 to 3.4 µmol L-1
>> PDF (462 KB) / Supplementary Information (730 KB)
DOI S0103-505320120050000019 Published online: August 7, 2012

Photocatalytic Degradation of Camphor by Suspended and Immobilized Photocatalysts
Carla Sirtori, Adriane M. de Freitas, Sérgio Toshio Fujiwara and Patricio Peralta-Zamora
J. Braz. Chem. Soc. 2012, 23, 1563



Immobilized forms of TiO2 permit almost total photocatalytic degradation of camphor in aqueous solution, including high mineralization degrees
>> PDF (0.98 MB)
DOI S0103-505320120050000020 Published online: August 7, 2012

A Quantitative Method using Near Infrared Imaging Spectroscopy for Determination of Surface Composition of Tablet Dosage Forms: an Example of Spirolactone Tablets
Renato L. Carneiro and Ronei J. Poppi
J. Braz. Chem. Soc. 2012, 23, 1570



The homogeneity of the components of a tablet was investigated using near infrared (NIR) imaging spectroscopy. Left side of the graphical abstract presents the chemometric technique used to find concentration maps of excipients and active pharmaceutical ingredient. Right side of the figure shows a tablet and the distribution of compounds in the tablet surface
>> PDF (914 KB)
DOI S0103-505320120050000022 Published online: August 9, 2012





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