JBCS

16:58, Mon Oct 23

Open Access/APCs

Current Issue vol. 28, No. 12, 2017, p. 2281-2513

 

Natural organic acids (NOAs) were efficient as green catalysts for the eco-friendly synthesis of xanthenones (up to 93% of yield) via one-pot reaction and under solvent-free conditions. Theoretical calculations to evaluate this reaction mechanism and regioselectivity as well as the potential anti-calcium blockers properties of xanthenones were described for the first time. Details are presented in the Article Natural Organic Acid as Green Catalyst for Xanthenones Synthesis: Methodology, Mechanism and Calcium Channel Blocking Activity by Bruna S. Terra, Aura M. B. Osorio, Aline de Oliveira, Rebeca P. M. Santos, Andressa P. Mouro, Natália F. de Araújo, Cameron C. da Silva, Felipe T. Martins, Luciene B. Vieira, Daniella Bonaventura, Heitor A. de Abreu, Antonio F. C. Alcântara and Ângelo de Fátima on page 2313.


Cover Article
J. Braz. Chem. Soc. 2017, 28(12), 2313-2325

Natural Organic Acid as Green Catalyst for Xanthenones Synthesis: Methodology, Mechanism and Calcium Channel Blocking Activity

Bruna S. Terra; Aura M. B. Osorio; Aline de Oliveira; Rebeca P. M. Santos; Andressa P. Mouro; Natália F. de Araújo; Cameron C. da Silva; Felipe T. Martins; Luciene B. Vieira; Daniella Bonaventura; Heitor A. de Abreu; Antonio F. C. Alcântara; Ângelo de Fátima

How to cite this article

Natural organic acids (NOAs) were efficient as green catalysts for the eco-friendly synthesis of xanthenones (up to 93% of yield) via one-pot reaction and under solvent-free conditions. Theoretical calculations to evaluate this reaction mechanism and regioselectivity as well as the potential anti-calcium blockers properties of xanthenones were described for the first time. Details are presented in the Article Natural Organic Acid as Green Catalyst for Xanthenones Synthesis: Methodology, Mechanism and Calcium Channel Blocking Activity by Bruna S. Terra, Aura M. B. Osorio, Aline de Oliveira, Rebeca P. M. Santos, Andressa P. Mouro, Natália F. de Araújo, Cameron C. da Silva, Felipe T. Martins, Luciene B. Vieira, Daniella Bonaventura, Heitor A. de Abreu, Antonio F. C. Alcântara and Ângelo de Fátima on page 2313.

http://dx.doi.org/10.21577/0103-5053.20170082

Published online: May 9, 2017

Articles J. Braz. Chem. Soc. 2017, 28(12), 2281-2290

Rare Earth-Indomethacinate Complexes with Heterocyclic Ligands: Synthesis and Photoluminescence Properties

João Batista M. Resende Filho; Paulo R. Santos; Juliana A. Vale; Wagner M. Faustino; Danyelle S. Farias; Hermi F. Brito; Maria C. F. C. Felinto; Ercules E. S. Teotonio

How to cite this article

 

Photophysical properties of the complexes were evaluated from luminescence data. It is proposed two intramolecular energy transfer mechanisms, which involve the participation of excited electronic states of the heterocyclic ligands as intermediate ones.

http://dx.doi.org/10.21577/0103-5053.20170079

Published online: May 3, 2017


J. Braz. Chem. Soc. 2017, 28(12), 2291-2300

Application of Response Surface Modeling and Chemometrics Methods for the Determination of Ofloxacin in Human Urine Using Dispersive Liquid-Liquid Microextraction Combined with Spectrofluorimetry

Farah Assadian; Ali Niazi

How to cite this article

 

Dispersive liquid-liquid microextraction (DLLME) and spectrofluorimeter coupled with chemometrics methods were applied for trace determination of ofloxacin in urine sample. Three-dimensional multivariate calibration was used for analysis of DLLME data.

http://dx.doi.org/10.21577/0103-5053.20170080

Published online: May 4, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2301-2312

Synthesis, Characterization and Enhanced Photocatalytic Activity of Iron Oxide/Carbon Nanotube/Ag-doped TiO2 Nanocomposites

José O. Marques Neto; Carlos R. Bellato; Carlos H. F. de Souza; Renê C. da Silva; Pablo A. Rocha

How to cite this article

 

The 10-Fe/MWCNT/TiO2-Ag-9 catalyst presents higher activity under longer wavelength light than pure TiO2. With good stability after 10 cycles, the catalyst has promising potential for practical applications.

http://dx.doi.org/10.21577/0103-5053.20170081

Published online: May 5, 2017


J. Braz. Chem. Soc. 2017, 28(12), 2313-2325

Natural Organic Acid as Green Catalyst for Xanthenones Synthesis: Methodology, Mechanism and Calcium Channel Blocking Activity

Bruna S. Terra; Aura M. B. Osorio; Aline de Oliveira; Rebeca P. M. Santos; Andressa P. Mouro; Natália F. de Araújo; Cameron C. da Silva; Felipe T. Martins; Luciene B. Vieira; Daniella Bonaventura; Heitor A. de Abreu; Antonio F. C. Alcântara; Ângelo de Fátima

How to cite this article

 

The eco-friendly synthesis of a series of xanthenones (up to 93% of yield) using natural organic acids as catalysts is reported.

http://dx.doi.org/10.21577/0103-5053.20170082

Published online: May 9, 2017


J. Braz. Chem. Soc. 2017, 28(12), 2326-2333

Application of Factorial Design for Optimization of the Synthesis of Lactulose Obtained from Whey Permeate

Fernanda C. Zimmer; Aloisio H. P. Souza; Ana F. C. Silveira; Maristela R. Santos; Makoto Matsushita; Nilson E. Souza; Angela C. Rodrigues

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Response surface for the concentration of lactulose according to the type of isomerization and reaction time.

http://dx.doi.org/10.21577/0103-5053.20170083

Published online: May 10, 2017


J. Braz. Chem. Soc. 2017, 28(12), 2334-2340

New 9-Aminoacridine Derivative: Synthesis, Study and Potential Application as pH Indicator in Organic Solvents

Pedro H. F. Stroppa; Nícolas Glanzmann; Lucas M. Duarte; Renata T. Sato; Marcone A. L. de Oliveira; Adilson D. da Silva

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Optimized TNA structures in ethanol: their HOMO/LUMO molecular orbitals and different colors according to the mediums.

http://dx.doi.org/10.21577/0103-5053.20170084

Published online: May 15, 2017


J. Braz. Chem. Soc. 2017, 28(12), 2341-2347

Exploiting Cork as Biosorbent Extraction Phase for Solid-Phase Microextraction to Determine 3-(4-Methylbenzylidene)camphor and 2-Ethylhexyl 4-(Dimethylamino)benzoate in River Water by Gas Chromatography-Mass Spectrometry

Ana C. Silva; Adriana N. Dias; Eduardo Carasek

How to cite this article

 

This study is related to the use of cork as a material of natural origin, renewable and biodegradable for the determination of two classes of UV filters in water samples. The results showed good extraction efficiency, as well as satisfactory analytical performance.

http://dx.doi.org/10.21577/0103-5053.20170085

Published online: May 17, 2017


J. Braz. Chem. Soc. 2017, 28(12), 2348-2356

Separation and Identification of Functional Groups of Molecules Responsible for Fluorescence of Biodiesel Using FTIR Spectroscopy and Principal Component Analysis

Humbervânia R. G. da Silva; Cristina M. Quintella; Marilena Meira

How to cite this article

 

Infrared spectroscopy coupled with principal component analysis allowed discriminating the fractions and identifying the functional groups of compounds present in the sample.

http://dx.doi.org/10.21577/0103-5053.20170088

Published online: May 18, 2017


J. Braz. Chem. Soc. 2017, 28(12), 2357-2364

Determination of Selenium in Bovine Semen by ICP-MS Using Formic Acid for Sample Preparation

Silmara R. Bianchi; Clarice D. B. Amaral; Caroline S. Silva; Ana Rita A. Nogueira

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A simple and fast procedure for Se determination in bovine semen by ICP-MS after sample solubilization with diluted formic acid.

http://dx.doi.org/10.21577/0103-5053.20170089

Published online: May 23, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2365-2374

Combination of Propylene Glycol Alginate and Lauric Acid on Water Retention and Mechanical Properties of Soy Protein Isolate-Based Films

Yi Liu; Hongyang Pan; Tougen Liao; Baokun Zhu; Zhiyu Li; Jiacan Wu; Yuandong Li; Jibao Cai; Mingfeng Wang

How to cite this article

 

Higher water retention ability and a single glass transition temperature (Tg) were found in ternary co-dried blending films when propylene glycol alginate (PGA) was added by a co-drying process. A single Tg indicates the compatibility of soy protein isolate (SPI), PGA and lauric acid (La). Differential scanning calorimetry scans showed higher relative humidity (RH) and reduced Tg due to incorporation of La.

http://dx.doi.org/10.21577/0103-5053.20170090

Published online: May 23, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2375-2381

Effect of Endophytic Fungal Associations on the Chemical Profile of in vitro Vochysia divergens Seedlings

Bruna A. S. Parpinelli; Katia A. Siqueira; Luis C. Kellner Filho; Letícia P. Pimenta; Ricardo M. da Costa; Renato L. T. Parreira; Rodrigo C. S. Veneziani; Marcio L. Andrade e Silva; Wilson R. Cunha; Patrícia M. Pauletti; Marcos A. Soares; Ana H. Januario

How to cite this article

 

Chemical profile by HPLC-DAD of leaves extracts from V. divergens seedlings inoculated with endophytic fungi isolated from V. divergens roots on dry and wet seasons in the Pantanal.

http://dx.doi.org/10.21577/0103-5053.20170091

Published online: May 24, 2017


J. Braz. Chem. Soc. 2017, 28(12), 2382-2390

Spatial and Temporal Variations in Secondary Metabolites Content of the Brazilian Arnica Leaves (Lychnophora ericoides Mart., Asteraceae)

Leonardo Gobbo-Neto; Anelize Bauermeister; Humberto T. Sakamoto; Dayana R. Gouvea; João Luis C. Lopes; Norberto P. Lopes

How to cite this article

 

The spatial and temporal variations in the secondary metabolites from Lychnophora ericoides were investigated. Chlorogenic acids presented highest concentrations in the dry season, while flavonoids were higher in the rainy season. Lower concentrations were found for all metabolites in flowery branches and old leaves.

http://dx.doi.org/10.21577/0103-5053.20170092

Published online: May 25, 2017


J. Braz. Chem. Soc. 2017, 28(12), 2391-2401

New Alternative to Produce Colored Polymer Nanocomposites: Organophilic Ni/Al and Co/Al Layered Double Hydroxide as Fillers into Low-Density Polyethylene

Silvia Jaerger; Sonia F. Zawadzki; Andreas Leuteritz; Fernando Wypych

How to cite this article

 

Colored hydrophobic layered double hydroxides (LDH) with the formula M+20.25Al0.75(A)0.25.nH2O, where M+2 = Ni or Co and A = dodecylsulfate, laurate, palmitate and stearate were synthesized and used as fillers in low density polyethylene. The influence of the metal in the LDH layers and the intercalated specie in the nanocomposites properties were discussed.

http://dx.doi.org/10.21577/0103-5053.20170093

Published online: May 25, 2017


J. Braz. Chem. Soc. 2017, 28(12), 2402-2411

Influence of the Transport of Sea Spray on the Salinization of the Semiarid Region Waters (Bahia, Brazil)

Adriana M. Silva; Vânia P. Campos; Rafaela S. Domingues; Lícia P. S. Cruz; Franciele O. Santana

How to cite this article

 

The sea spray presence in the atmosphere of the Semiarid was investigated. The trajectories of air masses for each sampling period showed that the air mass that arrived in the region passed over the ocean. The sea spray amount which reaches the region is insufficient to salinize waters.

http://dx.doi.org/10.21577/0103-5053.20170094

Published online: May 26, 2017


J. Braz. Chem. Soc. 2017, 28(12), 2412-2420

ITO Obtained by Spray Pyrolysis and Coating on Glass Substrate

Beatriz M. de Campos; Gabriela S. Freiria; Katia J. Ciuffi; Emerson H. de Faria; Lucas A. Rocha; Eduardo J. Nassar; Milton S. F. de Lima

How to cite this article

 

Transparent thin films present optoelectronic or optical applications. Spray pyrolysis can yield spherical indium and tin oxide (ITO) micro- and nanoparticles. The sol-gel methodology affords conductive films.

http://dx.doi.org/10.21577/0103-5053.20170095

Published online: May 26, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2421-2428

Development of Manual Shaking and Ultrasound-Assisted Surfactant-Enhanced Emulsification Microextraction for Analysis of Organophosphorus Pesticides in Aqueous Samples

Ya-Bing Xiong; Yue Zhao; Zhong-Hua Yang

How to cite this article

 

Target analytes were extracted into extraction solvent from aqueous phase. Extraction, concentration, and purification were done in one step. After centrifugation, extraction solvent was sedimented at the bottom of the tube.

http://dx.doi.org/10.21577/0103-5053.20170096

Published online: May 26, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2429-2437

Evaluating the Potential of Biodiesel Production through Microalgae Farming in Photobioreactor and High Rate Ponds from Wastewater Treatment

David M. M. Pinho; Renato S. Oliveira; Vitor M. L. dos Santos; Welington F. Marques; Angelo C. Pinto; Michelle J. C. Rezende; Paulo A. Z. Suarez

How to cite this article

 

The article evaluates farming of Chlorella sp. in photobioreactor and sewage sludge as potential source of fatty material for biodiesel production.

This paper is part of the PubliSBQ Special Issue in honor of the late Prof Angelo da Cunha Pinto.

http://dx.doi.org/10.21577/0103-5053.20170097

Published online: May 30, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2438-2446

Simultaneous Determination of Nonylphenol and Nonylphenol Ethoxylates in Wastewater Samples from Biodegradation Process by High Performance Liquid Chromatography Method

Yuanhua Xie; Shiyu Ma; Chunli Yuan; Yahong Pan; Qiao Wang; Ye Xu; Tong Zhu; Youzhao Wang; Jin Han; Meiyan You

How to cite this article

 

Under the optimized high performance liquid chromatography (HPLC) conditions, the NP and 11 kinds of NPnEO were separated and determined successfully within 35 min.

http://dx.doi.org/10.21577/0103-5053.20170099

Published online: June 2, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2447-2454

Biodiesel Glycerides from the Soybean Ethylic Route Incomplete Conversion on the Diesel Engines Combustion Process

Renato Cataluña; Zeban Shah; Leidimara Pelisson; Nattan R. Caetano; Rosângela da Silva; Carla M. N. Azevedo

How to cite this article

 

Pressure differential in the filter element resulting from the retention of particulate matter (PM) as a function of the volume of sampled gas to diesel CN 50 and your formulation with 10MR, 20MR, 10ER and 20ER. Lower differential pressure according to the gas volume indicates lower retention of PM.

http://dx.doi.org/10.21577/0103-5053.20170100

Published online: June 5, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2455-2463

Evaluation of Distribution and Bioaccumulation of Arsenic by ICP-MS in Tilapia (Oreochromis niloticus) Cultivated in Different Environments

Luciano H. B. Oliveira; Nathália S. Ferreira; Andrea Oliveira; Ana Rita A. Nogueira; Mario H. Gonzalez

How to cite this article

 

The arsenic levels found in different tissues of fish (tilapia) is an indicator of environment pollution and the different organs of the fish can influence the arsenic distribution and its bioaccumulation.

http://dx.doi.org/10.21577/0103-5053.20170101

Published online: June 5, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2464-2472

Development and Validation of a Stability-Indicating Method for Perillyl Alcohol Incorporated in Poly(lactide-co-glycolide) Nanoparticles and Stress Degradation Studies

Breno M. Marson; Raquel O. Vilhena; Flavia L. D. Pontes; Najeh M. Khalil; Roberto Pontarolo

How to cite this article

 

This study presents degradation studies, development and validation of an analytical method applied for both determination of perillyl alcohol encapsulation efficiency and evaluating the presence of related degradation products in polymeric nanoparticles formulation.

http://dx.doi.org/10.21577/0103-5053.20170102

Published online: June 6, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2473-2489

Anti-Trypanosoma Activity and Synergistic Effects of Natural and Semi-Synthetic Triterpenes and Predominant Cell Death through Autophagy in Amastigote Forms

Gleison D. P. Bossolani; Tânia Ueda-Nakamura; Sueli O. Silva; Benedito P. Dias Filho; Tulio O. G. Costa; Raúl H. R. Quintanilla; Sabrina T. Martinez; Valdir F. Veiga-Junior; Angelo C. Pinto; Celso V. Nakamura

How to cite this article

 

Triterpenes showed promising activities and synergistic effects, which resulted in mitochondrial dysfunction and cell death by apoptosis, against amastigote forms of Trypanosoma cruzi.

This paper is part of the PubliSBQ Special Issue in honor of the late Prof Angelo da Cunha Pinto.

http://dx.doi.org/10.21577/0103-5053.20170103

Published online: June 6, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2490-2499

The Structure and Composition of Corrosion Product Film and its Relation to Corrosion Rate for Carbon Steels in CO2 Saturated Solutions at Different Temperatures

Yong Zhou; Pei Zhang; Yu Zuo; Dong Liu; Fuan Yan

How to cite this article

 

When carbon steels were exposed in CO2 saturated solutions at different temperatures, corrosion product film with different structure and composition formed on the surface of carbon steels and dominated the corrosion rate of carbon steels significantly.

http://dx.doi.org/10.21577/0103-5053.20170147

Published online: August 16, 2017

Short Report J. Braz. Chem. Soc. 2017, 28(12), 2500-2505

Colorimetric Determination of Ascorbic Acid Based on Its Interfering Effect in the Enzymatic Analysis of Glucose: An Approach Using Smartphone Image Analysis

Mayra S. Coutinho; Camilo L. M. Morais; Ana C. O. Neves; Fabrício G. Menezes; Kássio M. G. Lima

How to cite this article

 

A new method using smartphone image analysis for quantification of ascorbic acid (AA) in vitamin C tablets is described. The method is based on AA interfering effect in enzymatic colorimetric detection of glucose.

http://dx.doi.org/10.21577/0103-5053.20170086

Published online: May 17, 2017

J. Braz. Chem. Soc. 2017, 28(12), 2506-2513

A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper‑Based Colorimetric Sensors

Camilo L. M. Morais; Lilian C. da Silva; Nayara A. Pinheiro; Fabrício G. Menezes; Kássio M. G. Lima

How to cite this article

 

A low-cost video-based reflectometer device was developed to quantify Cu2+ using paper-based colorimetric sensors.

http://dx.doi.org/10.21577/0103-5053.20170087

Published online: May 17, 2017

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