JBCS

2:03, Wed Nov 22

Open Access/APCs

vol. 26, No. 2, 2015, p. 209-402

 

High throughput screening techniques (HTS) are fast and efficient alternatives to evaluate enzymatic activities. Here, this technique is applied to obtain enantiomeric excess and conversions values with chiral fluorogenic probes and a non fluorogenic competitor, which was named Quick-ee. The fluorescent signal reveals of the enantioselectivity of the enzyme. Details are presented in the Article High Throughput Enzymatic Enantiomeric Excess: Quick-ee by Maria L. S. de O. Lima, Caroline C. da S. Gonçalves, Juliana C. Barreiro, Quezia Bezerra Cass and Anita Jocelyne Marsaioli on page 319.


Cover Article
J. Braz. Chem. Soc. 2015, 26(2), 319-324

High Throughput Enzymatic Enantiomeric Excess: Quick-ee

Maria L. S. O. Lima; Caroline C. S. Gonçalves; Juliana C. Barreiro; Quezia B. Cass; Anita J. Marsaioli

How to cite this article

High throughput screening techniques (HTS) are fast and efficient alternatives to evaluate enzymatic activities. Here, this technique is applied to obtain enantiomeric excess and conversions values with chiral fluorogenic probes and a non fluorogenic competitor, which was named Quick-ee. The fluorescent signal reveals of the enantioselectivity of the enzyme. Details are presented in the Article High Throughput Enzymatic Enantiomeric Excess: Quick-ee by Maria L. S. de O. Lima, Caroline C. da S. Gonçalves, Juliana C. Barreiro, Quezia Bezerra Cass and Anita Jocelyne Marsaioli on page 319.

http://dx.doi.org/10.5935/0103-5053.20140282

Published online: November 28, 2014

Letter J. Braz. Chem. Soc. 2015, 26(2), 209-217

Metrological Traceability of Measurement Results in Pharmaceutical and Chemical Sciences: Selection and Use of Certified Reference Materials

Raquel Nogueira

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http://dx.doi.org/10.5935/0103-5053.20140259

Published online: November 7, 2014

Communication J. Braz. Chem. Soc. 2015, 26(2), 218-223

Three-Component Reactions of 7-Hydroxy Coumarin Derivatives, Acetylenic Esters and Aromatic Aldehydes in the Presence of NEt3

Sakineh Asghari; Robabeh Baharfar; Samaneh Ahangar Darabi; Reza Mohammadian

How to cite this article

 

Novel coumarin derivatives have been synthesized in good yields by three-component reactions of 7-hydroxy coumarins, dialkyl acetylenedicarboxylates and aromatic aldehydes in the presence of NEt3 under mild reaction conditions.

http://dx.doi.org/10.5935/0103-5053.20140252

Published online: October 31, 2014


Articles J. Braz. Chem. Soc. 2015, 26(2), 224-232

Upgrade of Biofuels Obtained from Waste Fish Oil Pyrolysis by Reactive Distillation

Alberto Wisniewski Jr.; Lorena Wosniak; Dilamara R. Scharf; Vinicyus R. Wiggers; Henry F. Meier; Edesio L. Simionatto

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The second generation biofuels produced from waste biomass material appear as a promising substitute to fossil fuels. The potential uses of the liquid biofuel have the high acidity as the main technological barrier. The bio-oil obtained from waste fish oil was submitted to reactive distillation during the refinement, in a process known as bio-oil upgrade, employing a widely available alcohols and cheap reactants as catalysts to improve their quality.

http://dx.doi.org/10.5935/0103-5053.20140251

Published online: October 31, 2014

J. Braz. Chem. Soc. 2015, 26(2), 233-238

Chemical Composition and Cytotoxic Activity of the Root Essential Oil from Jatropha ribifolia (Pohl) Baill (Euphorbiaceae)

Celia E. L. da Silva; Sandro Minguzzi; Rogério C. L. da Silva; Maria F. C. Matos; Danilo Tofoli; João E. de Carvalho; Ana L. T. G. Ruiz; Willian F. da Costa; Euclésio Simionatto

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The essential oil of roots of Jatropha ribifolia, obtained by hydrodistillation was characterized in terms of its chemical composition by GC-FID and GC-MS. The essential oil and fractions were tested in vitro against nine human cancer cell lines by sulforhodamine B assay.

http://dx.doi.org/10.5935/0103-5053.20140253

Published online: November 4, 2014


J. Braz. Chem. Soc. 2015, 26(2), 239-246

Metalloproteomic Profile Determination of Muscle Samples from Nile Tilapia (Oreochromis niloticus) Using AAS and ESI-MS/MS after 2D-PAGE Separation

Bruna Cavecci; Paula M. de Lima; João V. de Queiroz; Camila P. Braga; Cilene C. F. Padilha; Aline L. Leite; Marília A. R. Buzalaf; Luiz E. Pezzato; Pedro M. Padilha

How to cite this article

 

Metalloproteomic profile of muscle tissue samples from Nile tilapia (Oreochromis niloticus).

http://dx.doi.org/10.5935/0103-5053.20140260

Published online: November 11, 2014

J. Braz. Chem. Soc. 2015, 26(2), 247-254

Improving Yield of 1,3-Diglyceride by Whole-Cell Lipase from A. Niger GZUF36 Catalyzed Glycerolysis via Medium Optimization

Cuiqin Li; Lanxiang Li; Huanjing Zhou; Chaoshuang Xia; Laping He

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Yield of 1,3-diglyceride (1,3-DG) is improved 1.42-fold through optimization of medium via glycerolysis of triglyceride (TG) catalyzed by whole-cell lipase from a new isolated strain, Aspergillus niger GZUF36.

http://dx.doi.org/10.5935/0103-5053.20140261

Published online: November 11, 2014


J. Braz. Chem. Soc. 2015, 26(2), 255-265

The Correlation Between Electronic Structure and Antimalarial Activity of Tetrahydropyridines

Oscar A. Naranjo-Montoya; Lucas M. Martins; Luiz C. da Silva-Filho; Augusto Batagin-Neto; Francisco C. Lavarda

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Multivariate data analysis were employed to correlate the antimalarial activity of tetrahydropyridines derivatives with electronic structure data obtained through quantum mechanical calculations. The results bring valuable insights in order to design new active compounds.

http://dx.doi.org/10.5935/0103-5053.20140263

Published online: November 11, 2014


J. Braz. Chem. Soc. 2015, 26(2), 266-272

Synthesis of Poly(Dimethylsiloxane) Networks Functionalized with Imidazole or Benzimidazole for Copper(II) Removal from Water

Fábio L. Pissetti; Pedro L. de Araújo; Fábio A. B. Silva; Gaël Y. Poirier

How to cite this article

 

Functionalized elastomeric networks with imidazole or benzimidazole functional groups, derived from poly(dimethylsiloxane), were able to absorb copper(II) from aqueous solutions. The metal removal proceeded in accordance with the Sips adsorption model.

http://dx.doi.org/10.5935/0103-5053.20140264

Published online: November 11, 2014

J. Braz. Chem. Soc. 2015, 26(2), 273-281

Preparation, Characterization, Cytotoxicity and Antioxidant Activity of DOPA Melanin Modified by Amino Acids: Melanin-Like Oligomeric Aggregates

Thiago G. Costa; Mateus J. Feldhaus; Felipe S. Vilhena; Melina Heller; Gustavo A. Micke; Aldo S. Oliveira; Inês M. C. Brighente; Fabiola B. F. Monteiro; Tânia B. Creczynski-Pasa; Bruno Szpoganicz

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Preparation and characterization of new melanin chemically modified with serine and threonine amino acids, with low toxicity and high antioxidant capacity, potential molecules for pharmaceutical industry and food chemistry.

http://dx.doi.org/10.5935/0103-5053.20140277

Published online: November 25, 2014


J. Braz. Chem. Soc. 2015, 26(2), 282-289

Subcritical Extraction of Salvia hispanica L. Oil with N-Propane: Composition, Purity and Oxidation Stability as Compared to the Oils Obtained by Conventional Solvent Extraction Methods

Ana B. Zanqui; Damila R. de Morais; Cláudia M. da Silva; Jandyson M. Santos; Lucas U. R. Chiavelli; Paulo R. S. Bittencourt; Marcos N. Eberlin; Jesui V. Visentainer; Lúcio Cardozo-Filho; Makoto Matsushita

How to cite this article

 

This work presents an evaluation study of Salvia hispanica L. oil extracted by subcritical n-propane, compared to different conventional lipid extraction methods. Subcritical n-propane method is better than other methods, this is a promising alternative for oil extraction and results in a product with great composition, oxidative capacity and high purity.

http://dx.doi.org/10.5935/0103-5053.20140278

Published online: November 25, 2014

J. Braz. Chem. Soc. 2015, 26(2), 290-296

Synthesis of SAPO-34/ZSM-5 Composite and Its Catalytic Performance in the Conversion of Methanol to Hydrocarbonsc

Liping Li; Xiaojing Cui; Junfen Li; Jianguo Wang

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SAPO-34/ZSM-5 composite was synthesized with nano-sized ZSM-5 zeolite as seeds. It has a sphere-like morphology and a large quantity of mesopores. Owing to its proper acidity and mesoporosity, the composite exhibits high stability in the conversion of methanol to hydrocarbons (MTH reaction).

http://dx.doi.org/10.5935/0103-5053.20140279

Published online: November 25, 2014

J. Braz. Chem. Soc. 2015, 26(2), 297-309

Interlaboratory Comparison of Quantifying Hydrocarbons and Trace Elements in Sediment Samples from a Tropical Estuary

Adriana H. Nudi; Angela Wagener; Irene T. Gabardo; Rafael A. Lourenço; Arthur Scofield

How to cite this article

 

A homogeneous and stable sediment material (SED 001) was produced for quality assurance when quantifying hydrocarbons and trace elements in sediment samples.

http://dx.doi.org/10.5935/0103-5053.20140280

Published online: November 28, 2014

J. Braz. Chem. Soc. 2015, 26(2), 310-318

Electric Field-Assisted Solid Phase Extraction: Study of Electrochromatographic Parameters with an Anionic Model Compound

Ricardo M. Orlando; Jarbas J. R. Rohwedder; Susanne Rath

How to cite this article

 

Comparison of elution efficiency of the anionic model compound (sunset yellow) using conventional solid phase extraction (right cartridge) and electric field-assisted solid phase extraction (left cartridge).

http://dx.doi.org/10.5935/0103-5053.20140281

Published online: November 28, 2014

J. Braz. Chem. Soc. 2015, 26(2), 319-324

High Throughput Enzymatic Enantiomeric Excess: Quick-ee

Maria L. S. O. Lima; Caroline C. S. Gonçalves; Juliana C. Barreiro; Quezia B. Cass; Anita J. Marsaioli

How to cite this article

 

A schematic representation of the fluorogenic assays with (Quick-ee) and without competitor.

http://dx.doi.org/10.5935/0103-5053.20140282

Published online: November 28, 2014


J. Braz. Chem. Soc. 2015, 26(2), 325-330

An Uncommon Naphthaquinoid and a New Lignan Derivative from the Roots of Cordia leucocephala Moric

Jaécio C. Diniz; Francisco A. Viana; Maria da Conceição M. Torres; Raimundo Braz-Filho; Edilberto R. Silveira; Otília D. L. Pessoa

How to cite this article

 

Two uncommon compounds, a meroterpene naphthoquinoid (cordiaquinone P) and a new lignan derivative were isolated from the roots of Cordia leucocephala. Their structures, including the relative stereochemistry, were determined by spectrometric methods.

http://dx.doi.org/10.5935/0103-5053.20140283

Published online: November 28, 2014


J. Braz. Chem. Soc. 2015, 26(2), 331-337

Electrochemical and Optical Investigation of Conductive Polymer and MWCNT Nanocomposite Film

Ali Ehsani; Ferydon Babaei; Hossein Mostaanzadeh

How to cite this article

 

Composites of multi-walled carbon nanotubes and poly ortho aminophenol (POAP) were prepared by electropolymerization. Density functional theory calculation, optical properties and electrocatalytic activity of the composite have been investigated.

http://dx.doi.org/10.5935/0103-5053.20140284

Published online: December 2, 2014

J. Braz. Chem. Soc. 2015, 26(2), 338-349

Anionic Aliphatic Polyesteramide Copolymers: Evaluation of Dielectric Properties

Gheorghe Rusu; Elena Rusu

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The dielectric properties of anionic aliphatic polyesteramides were investigated by analyzing the complex dielectric permittivity, complex electric modulus, and complex impedance in the frequency range 100 Hz to 106 Hz, at room temperature.

http://dx.doi.org/10.5935/0103-5053.20140285

Published online: December 5, 2014

J. Braz. Chem. Soc. 2015, 26(2), 350-358

Seasonal Effects on HPLC-DAD-UV and UPLC-ESI-MS Fingerprints and Analgesic Activities of Vernonia Condensata Baker Extracts

Sabrina Afonso; Aldair C. de Matos; Vitor A. Marengo; Estefânia G. Moreira; Daniely X. Soares; Héctor Henrique F. Koolen; Ieda S. Scarminio

How to cite this article

 

HPLC-DAD-UV spectra were used to compare the chemical compositions in the different seasons. The results confirm a peripherally-mediated anti-inflammatory activity of V. condensate. The seasons had significant effects on the relative abundances of the metabolites.

http://dx.doi.org/10.5935/0103-5053.20140286

Published online: December 5, 2014

J. Braz. Chem. Soc. 2015, 26(2), 359-364

Determination of Metal Loading in Heterogeneous Catalyst by Slurry Sampling Flame Atomic Absorption Spectrometry

Marco A. S. Garcia; Daniel M. Silvestre; Cassiana S. Nomura; Liane M. Rossi

How to cite this article

 

This paper describes a new method for quantification of metal in supported catalysts using slurry sampling flame atomic absorption spectrometry. The slurry method allowed satisfactory results with no need for laborious extraction procedures.

http://dx.doi.org/10.5935/0103-5053.20140287

Published online: December 5, 2014

J. Braz. Chem. Soc. 2015, 26(2), 365-372

Non-Targeted Electrospray Mass Spectrometry-Based Metabolic Fingerprinting and PLS-DA-Based Classification of Brazilian "Malvas"

Cleverson A. F. Martins; Mário S. Piantavini; Rômulo P. Ribeiro; Erika Amano; Bruna V. Dal Prá; Roberto Pontarolo

How to cite this article

 

Besides Malva sylvestris, other plants are also known as "malvas" in Brazil. Direct infusion was used to differentiate three distinct species via electrospray ionization mass spectrometry fingerprintings and a partial least squares discriminant analysis method.

http://dx.doi.org/10.5935/0103-5053.20140288

Published online: December 9, 2014

J. Braz. Chem. Soc. 2015, 26(2), 373-380

Colloidal Dispersion Stability: Kinetic Modeling of Agglomeration and Aggregation

Guilherme K. Gonzatti; Paulo A. Netz; Luana A. Fiel; Adriana R. Pohlmann

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Mechanism for coalescence of colloidal particles occurs in a two-step mechanism: a rapid reversible agglomeration and a slow irreversible aggregation.

http://dx.doi.org/10.5935/0103-5053.20140290

Published online: December 12, 2014

J. Braz. Chem. Soc. 2015, 26(2), 381-388

Thiazolidin-4-ones from 3-(Aminomethyl)pyridine, Arenealdehydes and Mercaptoacetic Acid: Synthesis and Radical Scavenger Activity

Adriana M. Neves; Auri R. Duval; Gabriele A. Berwaldt; Daniela P. Gouvêa; Natália P. Flores; Pâmela G. da Silva; Francieli M. Stefanello; Wilson Cunico

How to cite this article

 

The synthesis and radical scavenger activity of 2-aryl-3-(pyridin-3-ylmethyl)thiazolidin-4-ones were reported.

http://dx.doi.org/10.5935/0103-5053.20140291

Published online: December 12, 2014


Short Report J. Braz. Chem. Soc. 2015, 26(2), 389-392

Potential Insecticidal Activity of Steroidal C-17 Pyrazolinyl Derivatives

Ning-Juan Fan; Shao-Peng Wei; Jin-Ming Gao; Jiang-Jiang Tang

How to cite this article

 

Eight steroids-based pyrazolinyl derivatives were synthetized by several steps and the compound where Ar = ph exerted marked insecticidal activity, comparable to that of the natural product insecticide celangulatin V.

http://dx.doi.org/10.5935/0103-5053.20140248

Published online: October 28, 2014

J. Braz. Chem. Soc. 2015, 26(2), 393-395

Correlation Between the Composition and Flash Point of Diesel-Biodiesel Blends

Rodrigo A. de Mattos; Flávio A. Bastos; Matthieu Tubino

How to cite this article

 

There is a clear correlation between the biodiesel quantity in a diesel-biodiesel blend and its flash point. This means that the experimental determination of a flash point temperature also provides information regarding the biodiesel content of diesel-biodiesel blends.

http://dx.doi.org/10.5935/0103-5053.20140262

Published online: November 11, 2014

J. Braz. Chem. Soc. 2015, 26(2), 396-402

Synthesis, Molecular Structure of Diethyl Phenylenebis(Methylene)Dicarbamates and FTIR Spectroscopy Molecular Recognition Study with Benzenediols

Marlene M. Saucedo-Balderas; Rogelio A. Delgado-Alfaro; Francisco J. Martínez-Martínez; David Ortegón-Reyna; Margarita Bernabé-Pineda; Oscar Zúñiga-Lemus; Juan S. González-González

How to cite this article

 

Mechanochemical complexation of phenylenebis(methylene)dicarbamates and benzenediols confirmed by Fourier transform infrared spectroscopy.

http://dx.doi.org/10.5935/0103-5053.20140289

Published online: December 9, 2014

Online version ISSN 1678-4790 Printed version ISSN 0103-5053
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