13/10/2011
Saiu o JBCS número 10 - Volume 22
O JBCS acaba de lançar online seu décimo número de 2011 (vol. 22-10, correspondente a Outubro). A impressão e, portanto, distribuição da revista aos assinantes ocorrerá em breve.
Neste novo número, ilustrando nosso novo design de capa, temos o Article Thermal Effect on the Microwave Assisted Biodiesel Synthesis Catalyzed by Lipases dos autores Ingrid C. R. Costa, Selma G. F. Leite, Ivana C. R. Leal, Leandro S. M. Miranda e Rodrigo O. M. A. de Souza. O texto editorial de autoria de Simon F. Campbell, presidente da Royal Society of Chemistry trata do tema "A Química e a Inovação em Saúde no Brasil". Ao todo, o JBCS vol. 22, No. 10 apresenta 206 páginas impressas, contendo 25 Artigos.
Assinem, e divulguem o JBCS. Façam um link de nossa página http://jbcs.sbq.org.br em sua instituição, laboratório ou empresa já que o acesso é aberto. Incentivem a leitura, pesquisa e citação ao JBCS.
Fonte: Elizabeth Magalhaes (JBCS)
Table of Contents with Graphical Abstracts
Thermal Effect on the Microwave Assisted Biodiesel Synthesis Catalyzed by Lipases |
Ingrid C. R. Costa, Selma G. F. Leite, Ivana C. R. Leal, Leandro S. M. Miranda and
Rodrigo O. M. A. de Souza |
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The microwave irradiation technique is an emerging tool on organic chemistry because of the acceleration of reaction time, increasing yields and cleaner/enhanced chemical processes. But the controversy about thermal or non-thermal microwave effects is still in the literature mainly when biocatalysts are involved. Lipases (triacyl glycerol hydrolases EC 3.1.1.3) are the most useful enzymes as they can be applied in both aqueous and nonaqueous media, have wide substrate specificity, have an excellent ability to recognize chirality, and do not require labile cofactors. |
With respect to the use of microwave irradiation in lipase catalyzed reactions, different groups have observed contradictory results and critical evaluation of the reaction condition is needed. Details are discussed in the article: Thermal Effect on the Microwave Assisted Biodiesel Synthesis Catalyzed by Lipases by Ingrid C. R. Costa, et al. on page 1993.
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>> Editorial(208 KB)
Chemistry and Healthcare Innovation in Brazil
Simon F. Campbell |
| J. Braz. Chem. Soc. 2011, 22, 1823. |
What do We Know about Reaction Mechanism? The Electrospray Ionization Mass Spectrometry Approach |
| Leonardo S. Santos |
| J. Braz. Chem. Soc. 2011, 22, 1827. |
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| This account illustrates the significant innovative potential of ESI.MS for the investigation of the organic/organometallic reaction mechanisms. It is also exemplified the usage of the ion/molecule reactions to probe the catalyst activity of different species intercepted in condensed phase, a straightforward method not available so far |
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Web Release date: July 21, 2011. |
Critical Evaluation of the Oxygen-Enhanced Combustion in Gas Burners for Industrial Applications and Heating Systems |
| Alex A. B. Santos, Ednildo A. Torres and Pedro A. P. Pereira |
| J. Braz. Chem. Soc. 2011, 22, 1841. |
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| The oxygen enhanced combustion (OEC) is presented as a promising technique for increasing the energy efficiency of industrial burners. However, some gaps appear to explain the application of this technique in the oil and gas industries, and this work presents an evaluation on the subject |
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Web Release date: August 11, 2011. |
Determination of Ca, Cu, Fe and Mg in Fresh and Processed Meat Treated with Tetramethylammonium Hydroxide by Atomic Absorption Spectrometry |
Adriane M. Nunes, Tanize S. Acunha, Eliézer Q. Oreste, Fábio G. Lepri, Mariana A. Vieira,
Adilson J. Curtius and Anderson S. Ribeiro |
| J. Braz. Chem. Soc. 2011, 22, 1850. |
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| In this paper, a simple method for treating fresh (FM) and processed for (PM) meat with tetra-methylammonium hydroxide (TMAH) is proposed to the determination of Ca, Cu, Fe and Mg by atomic absorption spectrometry |
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Web Release date: July 14, 2011. |
Metal Concentration in Sediments from the Santos Estuarine System: a Recent Assessment |
Isabella C. A. C. Bordon, Jorge E. S. Sarkis, Gustavo M. Gobbato, Marcos A. Hortellani and
Claudia M. Peixoto |
| J. Braz. Chem. Soc. 2011, 22, 1858. |
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| Sediment samples were collected along the Santos Estuarine System and metal (such as Cu, Hg, Ni, Pb and Zn) concentrations were measured. Some of the sample presented Hg concentration above the Canadian Sediment Quality Guidelines recommendation. The study of the PCA grouped sites close to an important industrial area indicated a more critical sediment contamination, which was confirmed by the cluster analysis. The results demonstrated that metal contamination is still a problem for the bent ecosystem of the Santos Estuarine System (São Paulo State, Brazil) |
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Web Release date: July 14, 2011. |
Extraction of Lignin from Sugar Cane Bagasse and its Modification into a High Performance Dispersant for Pesticide Formulations |
| Zhili Li and Yuanyuan Ge |
| J. Braz. Chem. Soc. 2011, 22, 1866. |
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| Suspending rate of DWG with different lignosulfonates at 8.0% dosage. The dispersant modified from sugar cane bagasse lignin (EBL-M) had the equal dispersing efficiency to kinsperse and being higher than other commercial lignosulfonates |
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Web Release date: July 19, 2011. |
Styrene Photocatalytic Degradation Reaction Kinetics |
| Silvio R. Taffarel, Marla A. Lansarin and Celso C. Moro |
| J. Braz. Chem. Soc. 2011, 22, 1872. |
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| The aqueous styrene photocatalytic degradation reaction was evaluated using TiO2 P-25 (Degussa) as a catalyst. The chromatographic analysis revealed benzaldehyde as one of the intermediates |
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Web Release date: July 19, 2011. |
Molluscicidal Activity of Compounds Isolated from Euphorbia conspicua N. E. Br. |
| Rosalina C. S. Mata, Dina I. M. D. de Mendonça, Liliana Vieira, Aldenir F. dos Santos, Luciana A. da Silva, Jorge F. Gaspar, Célia Martins, José Rueff and Antônio E. G. Sant’Ana |
| J. Braz. Chem. Soc. 2011, 22, 1880. |
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| 3β-(E)-cinnamoyleuphorbol, a new tirucallane triterpene together with known compounds of euphane, cycloartane and ingenane skeleta were isolated from latex of E. viscose and evaluated for their molluscicidal, mutagenis, genotoxic and citotoxic activities |
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Web Release date: July 21, 2011. |
Development of a Fluorimetric Sequential Injection Analysis (SIA) Methodology for Determination of Quinine |
| Carlos M. C. Infante and Jorge C. Masini |
| J. Braz. Chem. Soc. 2011, 22, 1888. |
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| Sequential injection system for determination of quinine: C = carrier solution (H2O), SV = syringe valve, SP = syringe pump, HC = holding coil, RV = eight port rotary selection valve, S = standard solution, R = 0.10 mol L-1 sulfuric acid, RC = reaction coil, D = fluorimetric detector and W = waste |
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Web Release date: July 26, 2011. |
Effect of Cerium Loading on Structure and Morphology of Modified Ce-USY Zeolites |
Fillipe A. C. Garcia, Daniel R. Araújo, Júnia C. M. Silva, Julio L. de Macedo, Grace F. Ghesti,
Sílvia C. L. Dias, José A. Dias and Geraldo N. R. Filho |
| J. Braz. Chem. Soc. 2011, 22, 1894. |
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Ce-USY (2-25 wt.% of CeO2) showed increased Lewis/Brønsted ratio with increasing cerium loadings due to the interaction of the excess cerium with USY hydroxyl groups and the formation of CeOx species |
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Web Release date: July 26, 2011. |
Attenuated Total Reflectance with Fourier Transform Infrared Spectroscopy (ATR/FTIR) and Different PLS Algorithms for Simultaneous Determination of Clavulanic Acid and Amoxicillin in Powder Pharmaceutical Formulation |
| Aline L. H. Müller, Érico M. M. Flores, Edson I. Müller, Fabiana E. B. Silva and Marco F. Ferrão |
| J. Braz. Chem. Soc. 2011, 22, 1903. |
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| An alternative method for the simultaneous quantification of clavulanic acid (CA) and amoxicillin (AMO) in powder pharmaceutical formulations using ATR/FTIR spectroscopy and variable selection by interval PLS (iPLS), synergy interval PLS (siPLS) and backward interval PLS (biPLS) |
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Web Release date: July 28, 2011. |
Intralaboratory Validation, Comparison and Application of HPLC-UV-DAD Methods for Simultaneous Determination of Benzalkonium Chloride, Chlorexidine Digluconate and Triclosan |
| Simone C. Chiapetta, Érika C. B. de Oliveira, Beta C. Olivier, Luiza A. Mercante, Danielle M. Henriques and Annibal D. Pereira Netto |
| J. Braz. Chem. Soc. 2011, 22, 1913. |
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| Chromatographic separation of the studied compounds in the two sets of chromatographic conditions. Triclosan (TR), chlorexidine digluconate (CD) and benzalkonium chloride homologues (C12, C14 and C16) |
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Web Release date: July 28, 2011. |
Distribution of Pesticide Residues in Rice Grain and in its Coproducts |
Giniani C. Dors, Ednei G. Primel, Carlos A. A. Fagundes, Carlos H. P. Mariot
and Eliana Badiale-Furlong |
| J. Braz. Chem. Soc. 2011, 22, 1921. |
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| The validation of a modified QuEChERS method allowed the extraction of carbofuram, bispyribac-sodium, clomazone, and tebuconazole from rice bran and its coproducts. The HPLC-DAD method (illustrated in the chromatogram) were suitable for both indetification and quantification of such compounds |
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Web Release date: August 2, 2011. |
Constant-Current Coulometry and Ion Chromatography Bromide Determination to Characterize the Purity of the Potassium Chloride |
| Paulo P. Borges, Sidney P. Sobral, Lilian da Silva, Thiago O. Araújo and Renata S. Silva |
| J. Braz. Chem. Soc. 2011, 22, 1931. |
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| Schematic diagram of the primary system of coulometry with the coulometric cell to characterize the purity of the potassium chloride |
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Web Release date: August 4, 2011. |
A Concise Synthetic Method for 1,3,5-Triazinane-2,4- Dithiones |
| Zheng Li, Hongfang Cai, Jingya Yang, Pengxian Niu and Chenhui Liu |
| J. Braz. Chem. Soc. 2011, 22, 1939. |
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| 1,3,5-Triazinane-2,4-dithiones were efficiently synthesized via condensation of 2 equiv. of 1-arylthioureas with 1 equiv. of aliphatic carboxylic acids using ferric chloride hexahydrate as a catalyst |
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Web Release date: August 11, 2011. |
Optimization and Validation of a Method using SPE and LC-APCI-MS/MS for Determination of Pharmaceuticals in Surface and Public Supply Water |
| Liziane V. Cardoso, Débora Tomasini, Maicon R. F. Sampaio, Sergiane S. Caldas, Natiele Kleemann, Ednei G. Primel and Fabio F. Gonçalves |
| J. Braz. Chem. Soc. 2011, 22, 1944. |
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| Pharmaceuticals go through metabolic processes in the organism after ingestion. They are later excreted in their original form or as metabolites. They end up in surface water and eventually in water treatment plants. Since the treatment may not be as efficient in their removal, they can be found in drinking water |
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Web Release date: August 16, 2011. |
Preparation and Characterization of a Chemically Sulfated Cashew Gum Polysaccharide |
Érico de Moura Neto, Jeanny da S. Maciel, Pablyana L. R. Cunha, Regina Célia M. de Paula
and Judith P. A. Feitosa |
| J. Braz. Chem. Soc. 2011, 22, 1953. |
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| The figure represents a sequence of the origin, purification and sulfation of cashew gum. The first panel shows the tree exudation, followed by the purified gum and the sulfation on the C-6 of galactose, the main constituent of cashew gum |
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Web Release date: August 18, 2011. |
Determination of Arsenic Species in P. calomelanos and N. biserrata |
Luana B. Melendez, Emmanoel V. Silva-Filho, Norbert Miekeley, Flavia de Almeida Vieira
and Silvia M. Sella |
| J. Braz. Chem. Soc. 2011, 22, 1961. |
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| The graphical abstract represents a possible arsenic detoxification in plants by phytochelatins that are peptides biosynthesised from glutathione GSH (g-Glu-Cys)n-Gly which are enzimatically sintetized by PC-sinterase |
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Web Release date: August 18, 2011. |
Evaluation of Turbidimetric and Nephelometric Techniques for Analytical Determination of N -Acetylcysteine and Thiamine in Pharmaceutical Formulations Employing a Lab-Made Portable Microcontrolled Turbidimeter and Nephelometer |
Vagner B. dos Santos, Thiago B. Guerreiro, Willian T. Suarez, Ronaldo C. Faria and
Orlando Fatibello-Filho |
| J. Braz. Chem. Soc. 2011, 22, 1968. |
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Microcontroller employed as a central processing unit (CPU) able to drive and communicate with several devices simultaneously, such as: liquid crystal display, photodiode, light emitting diode, universal serial bus (USB), and personal computer (PC) |
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Web Release date: August 18, 2011. |
Interaction of Allylic Carbocations with Benzene: a Theoretical Model of Carbocationic Intermediates in Terpene Biosynthesis |
| Fernanda G. Oliveira and Pierre M. Esteves |
| J. Braz. Chem. Soc. 2011, 22, 1979. |
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| The interaction between strongly delocalized carbocations and an aromatic ring was investigated as a model study for the reactions involved in terpene biosynthesis |
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Web Release date: August 23, 2011. |
Determination of Iron and Aluminum Based on the Catalytic Effect on the Reaction of Xylene Cyanol FF with Hydrogen Peroxide and Potassium Periodate |
| Longfei Cai and Chunxiu Xu |
| J. Braz. Chem. Soc. 2011, 22, 1987. |
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| This figure shows that Fe and Al have significant catalytic effects on the reaction of xylene cyanol FF with hydrogen peroxide and potassium periodate simultaneously present, whereas both Fe and Al have no catalytic effects on oxidation reaction of xylene cyanol FF in the presence of either hydrogen peroxide or potassium periodate |
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Web Release date: August 23, 2011. |
Thermal Effect on the Microwave Assisted Biodiesel Synthesis Catalyzed by Lipases |
Ingrid C. R. Costa, Selma G. F. Leite, Ivana C. R. Leal, Leandro S. M. Miranda and
Rodrigo O. M. A. de Souza |
| J. Braz. Chem. Soc. 2011, 22, 1993. cover article |
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| A comparative study between microwave irradiation and conventional heating protocol was performed on the esterification reaction of oleic acid catalyzed by lipases and the results revealed no difference on the reaction time or yield |
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Web Release date: August 30, 2011. |
Molecular Aspects of the Reactivation Process of Acetylcholinesterase Inhibited by Cyclosarin |
| Karina S. Matos, Daiana T. Mancini, Elaine F. F. da Cunha, Kamil Kuèa, Tanos C. C. França and Teodorico C. Ramalho |
| J. Braz. Chem. Soc. 2011, 22, 1999. |
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| H bonds formed between the best conformation of the oxime K005 and the residues of the active site of Mus musculus acetylcholinesterase (MmAChE) |
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Web Release date: July 19, 2011. |
Development and Validation of a Simple and Rapid Capillary Zone Electrophoresis Method for Determination of NNRTI Nevirapine in Pharmaceutical Formulations |
| Luiz A. Zanolli Filho, Cristiane R. Galdez, Claudinei A. Silva, Marina F. M. Tavares, Diana M. Costa and María S. Aurora-Prado |
| J. Braz. Chem. Soc. 2011, 22, 2005. |
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| A simple and fast capillary zone electrophoresis method for determination of nevirapine in drug products was developed and validated. Nevirapine was separated in less than 2.0 min |
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Web Release date: August 2, 2011. |
Low Temperature Synthesis of CdSiO3 Nanostructures |
| Leonardo P. Santana, Erick S. de Almeida, Jones L. Soares and Flavio M. Vichi |
| J. Braz. Chem. Soc. 2011, 22, 2013. |
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| CdSiO3 can be prepared at 580 °C from cadmium chloride and two different Si-containing precursors: mesostructured silica and sodium silicate. This results in strikingly different morphologies: sodium silicate yields needle-shaped nanostructures, whereas mesostructured silica leads to coralloid-shaped structures |
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Web Release date: August 9, 2011. |
A Novel Method for Extraction of Oils from Oleaginous Seeds |
| Abdelouaheb Djilani and Amadou Dicko |
| J. Braz. Chem. Soc. 2011, 22, 2018. |
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| The figure shows the use of solvent-free conditions in the extraction of oil from oleaginous seeds. The use of surfactant allows extracting oil from seeds with good yields. The obtained oil has the same properties of oil obtained by classical method. A positive economic and environmental impact of the proposed method is shown |
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Web Release date: August 9, 2011. |
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