JBCS

21:26, Mon Mar 27

Open Access/APCs

vol. 28, No. 4, 2017, p. 521-693

 

Polymers play a key role in defining the size, morphology and, crystal structure of calcium carbonate particles synthesized by mixing solutions of inorganic salts. Whilst this is a much cheaper and sustainable method than CO2 gas diffusion, it leads to small, spherical, and homogeneous particles upon pinpoint choice of the polymer. Details are presented in the Article Synthesis of Submicrometer Calcium Carbonate Particles from Inorganic Salts Using Linear Polymers as Crystallization Modifiers by Sara E. Facchinetto, Tanize Bortolotto, Gabrielly E. Neumann, Jean C. B. Vieira, Bryan B. de Menezes, Cristiano Giacomelli and Vanessa Schmidt on page 547.


Cover Article
J. Braz. Chem. Soc. 2017, 28(4), 547-556

Synthesis of Submicrometer Calcium Carbonate Particles from Inorganic Salts Using Linear Polymers as Crystallization Modifiers

Sara E. Facchinetto; Tanize Bortolotto; Gabrielly E. Neumann; Jean C. B. Vieira; Bryan B. de Menezes; Cristiano Giacomelli; Vanessa Schmidt

How to cite this article

Polymers play a key role in defining the size, morphology and, crystal structure of calcium carbonate particles synthesized by mixing solutions of inorganic salts. Whilst this is a much cheaper and sustainable method than CO2 gas diffusion, it leads to small, spherical, and homogeneous particles upon pinpoint choice of the polymer. Details are presented in the Article Synthesis of Submicrometer Calcium Carbonate Particles from Inorganic Salts Using Linear Polymers as Crystallization Modifiers by Sara E. Facchinetto, Tanize Bortolotto, Gabrielly E. Neumann, Jean C. B. Vieira, Bryan B. de Menezes, Cristiano Giacomelli and Vanessa Schmidt on page 547.

http://dx.doi.org/10.5935/0103-5053.20160196

Published online: June 30, 2016

Articles J. Braz. Chem. Soc. 2017, 28(4), 521-528

MALDI Imaging Mass Spectrometry of Fresh Water Cyanobacteria: Spatial Distribution of Toxins and Other Metabolites

Beatriz B. Sandonato; Vanessa G. Santos; Milena F. Luizete; João L. Bronzel Jr.; Marcos N. Eberlin; Humberto M. S. Milagre

How to cite this article

 

Spatial distribution of toxins and other metabolites of fresh water cyanobacteria by matrix-assisted laser desorption ionization imaging mass spectrometry (MALDI-IMS).

http://dx.doi.org/10.5935/0103-5053.20160191

Published online: June 28, 2016

J. Braz. Chem. Soc. 2017, 28(4), 529-539

A Sensitive Voltammetric Determination of Anti-Parkinson Drug Pramipexole Using Titanium Dioxide Nanoparticles Modified Carbon Paste Electrode

Seyed Karim Hassaninejad-Darzi; Farshad Shajie

How to cite this article

 

A sensor based on titanium dioxide nanoparticles modified carbon paste electrode (TiO2NPs/CPE) was developed for electrocatalytic oxidation of pramipexole in pharmaceutical formulations and biological samples in the phosphate solution at pH 5.0.

http://dx.doi.org/10.5935/0103-5053.20160192

Published online: June 28, 2016

J. Braz. Chem. Soc. 2017, 28(4), 540-546

A Green Extraction of Trace Iodine in Table Salts, Vegetables, and Food Products Prior to Analysis by Inductively Coupled Plasma Optical Emission Spectrometry

Nunticha Limchoowong; Phitchan Sricharoen; Suchila Techawongstien; Supalak Kongsri; Saksit Chanthai

How to cite this article

 

Green and efficient ultrasound assisted extraction of iodine from food products was obtained. Deionized water was used as an extraction solvent under ultrasonic-assisted extraction (UAE) within 5 min. High recovery of all samples verified good extraction performance.

http://dx.doi.org/10.5935/0103-5053.20160193

Published online: June 28, 2016

J. Braz. Chem. Soc. 2017, 28(4), 547-556

Synthesis of Submicrometer Calcium Carbonate Particles from Inorganic Salts Using Linear Polymers as Crystallization Modifiers

Sara E. Facchinetto; Tanize Bortolotto; Gabrielly E. Neumann; Jean C. B. Vieira; Bryan B. de Menezes; Cristiano Giacomelli; Vanessa Schmidt

How to cite this article

 

Instead of the typical crystallization of CaCO3 into large calcite crystals, very small uniform spherical particles were formed upon addition of polymers.

http://dx.doi.org/10.5935/0103-5053.20160196

Published online: June 30, 2016

J. Braz. Chem. Soc. 2017, 28(4), 557-566

Anodic Oxidation of Sulfide to Sulfate: Effect of the Current Density on the Process Kinetics

Paulo C. Caliari; Maria J. Pacheco; Lurdes F. Ciríaco; Ana M. C. Lopes

How to cite this article

 

S2- was oxidized to SO42- at a boron-doped diamond (BDD) anode. The oxidation occurs with the formation of other intermediate sulfur species, mainly at low applied current intensity.

http://dx.doi.org/10.5935/0103-5053.20160197

Published online: June 30, 2016

J. Braz. Chem. Soc. 2017, 28(4), 567-574

Computational Study of Electronic Effects from β-Substituents on the Tautomerism of Naphthazarin Derivatives

Fábio S. Grasel; Gabriel O. Castanho; Luiz A. M. Fontoura; Paulo A. Netz

How to cite this article

 

In this work, computational calculation methods were applied to study the interconversion between tautomers of several naphthazarin and 5-amino-8-hydroxy-1,4-naphthoquinone β-substituted derivatives bearing electron-donor or electron-withdrawing groups.

http://dx.doi.org/10.5935/0103-5053.20160198

Published online: July 1, 2016


J. Braz. Chem. Soc. 2017, 28(4), 575-581

Central Composite Design to Optimizate the Derivatization Procedure for Analysis of Biogenic Amines by HPLC-UV

Ángela K. Argotty Salazar; Juan J. Lozada Castro

How to cite this article

 

A methodology for biogenic amines derivatization was optimized by experimental design. The optimal conditions were: 15 μL of derivatizing reagent, 20 °C of temperature and 40 min of reaction.

http://dx.doi.org/10.5935/0103-5053.20160200

Published online: July 4, 2016

J. Braz. Chem. Soc. 2017, 28(4), 582-588

Non-Synergistic UV-A Photocatalytic Degradation of Estrogens by Nano-TiO2 Supported on Activated Carbon

Suzamar M. C. Rosa; Arlene B. S. Nossol; Edson Nossol; Aldo J. G. Zarbin; Patricio G. Peralta-Zamora

How to cite this article

 

Synergy effect in the photocatalytic degradation of organic substrates by TiO2/activated carbon nanocomposites.

http://dx.doi.org/10.5935/0103-5053.20160201

Published online: July 5, 2016


J. Braz. Chem. Soc. 2017, 28(4), 589-597

Effect of Sulfamic Acid on 1,3-Dipolar Cycloaddition Reaction: Mechanistic Studies and Synthesis of 4-Aryl-NH-1,2,3-triazoles from Nitroolefins

Pankaj Sharma; Niggula P. Kumar; Kishna R. Senwar; Oscar Forero-Doria; Fabiane M. Nachtigall; Leonardo S. Santos; Nagula Shankaraiah

How to cite this article

 

A facile and new metal-free 1,3-dipolar cycloaddition reaction for the synthesis of 4-aryl-NH-1,2,3-triazoles from nitroolefins and NaN3 employing NH2SO3H has been developed. The key intermediates associated with this transformation have been characterized by on line monitoring of the reaction by using ESI-MS/MS.

http://dx.doi.org/10.21577/0103-5053.20160203

Published online: July 8, 2016


J. Braz. Chem. Soc. 2017, 28(4), 598-602

Warmingiins A and B, Two New Dimeric Naphthoquinone Derivatives from Sinningia warmingii (Gesneriaceae)

Vanessa Winiewski; Maria Helena Verdan; Marcos A. Ribeiro; Alvaro J. Hernandez-Tasco; Marcos J. Salvador; Maria Elida A. Stefanello

How to cite this article

 

Two new dimeric naphthoquinone derivatives, warmingiins A and B, were isolated from the tubers of Sinningia warmingii.

http://dx.doi.org/10.21577/0103-5053.20160204

Published online: July 8, 2016


J. Braz. Chem. Soc. 2017, 28(4), 603-614

Distribution and Sources of Aliphatic and Polycyclic Aromatic Hydrocarbons in Surface Sediments of Itajaí-Açu Estuarine System in Brazil

Morgana Frena; Giovana A. Bataglion; Sara S. Sandini; Katia N. Kuroshima; Marcos N. Eberlin; Luiz A. S. Madureira

How to cite this article

 

Aliphatic and polycyclic aromatic hydrocarbons were assessed in surface sediment samples of Itajaí-Açu estuarine system, in order to determine the depositional organic matter source.

http://dx.doi.org/10.21577/0103-5053.20160205

Published online: July 13, 2016


J. Braz. Chem. Soc. 2017, 28(4), 615-621

Simultaneous Determination of Antimalarial Agents by LC-MS/MS and Its Application to Evaluation of Fixed-Dose Tablets

Breno M. Marson; Raquel O. Vilhena; Flavia L. D. Pontes; Mário S. Piantavini; Roberto Pontarolo

How to cite this article

 

Quality control methods to detect poor-quality medicines and counterfeit antimalarials are essential. This study presents a rapid and reliable LC-MS/MS method, successfully applied for evaluating the quality of the antimalarials artesunate and mefloquine.

http://dx.doi.org/10.21577/0103-5053.20160206

Published online: July 13, 2016

J. Braz. Chem. Soc. 2017, 28(4), 622-628

Production, Purification and Physicochemical Properties of an Exo‑Polygalacturonase from Aspergillus niger SW06

Yu-ping Ma; Hui Hao; Zhi-fei Chen; Zhi-wei Zhao; Shun-hui Chen; Si-wen Sun; Chun-ping Xu

How to cite this article

 

SDS-PAGE of standard proteins (left column), exo-PG (middle column) and purified PG (right column) from DEAE-Sepharose FF chromatography. After purification, SDS-PAGE analysis of the purified exo-polygalacturonase from Aspergillus niger SW06 showed a single band with a molecular mass of 66.2 kDa.

http://dx.doi.org/10.21577/0103-5053.20160210

Published online: July 14, 2016

J. Braz. Chem. Soc. 2017, 28(4), 629-640

Identification of Glycoside Compounds from Tobacco by High Performance Liquid Chromatography/Electrospray Ionization Linear Ion-Trap Tandem Mass Spectrometry Coupled with Electrospray Ionization Orbitrap Mass Spectrometry

Chunxiao Jia; Yonghua Zhu; Jinjie Zhang; Jing Yang; Chunping Xu; Duobin Mao

How to cite this article

 

Twenty-two glycoside compounds have been separated from tobacco after ultrasonic assistant extraction and purified by Amberlite AB-8 column. The structures of the tobacco glycosides were reliably identified by high performance liquid chromatography electrospray ionization linear ion-trap tandem mass spectrometry (HPLC-ESI-LIT/MSn) coupled with electrospray ionization orbitrap mass spectrometry (ESI-Orbitrap-MS).

http://dx.doi.org/10.21577/0103-5053.20160211

Published online: July 18, 2016

J. Braz. Chem. Soc. 2017, 28(4), 641-648

Influence of Textural Properties and Surface Fractal Dimensions on the Cobalt Adsorption Behavior of Rice Hull Ash Prepared via Solid Combustion

Norma A. Sánchez-Flores; Francisco Granados-Correa; Silvia Bulbulian

How to cite this article

 

Surface fractal dimensions of rice hull ash samples prepared by solid-combustion with corresponding Co2+ adsorption.

http://dx.doi.org/10.21577/0103-5053.20160212

Published online: July 18, 2016

J. Braz. Chem. Soc. 2017, 28(4), 649-658

Nanocomposites Based on Cassava Starch and Chitosan-Modified Clay: Physico‑Mechanical Properties and Biodegradability in Simulated Compost Soil

Gustavo F. Perotti; Thitisilp Kijchavengkul; Rafael A. Auras; Vera R. L. Constantino

How to cite this article

 

Starch-based material comprising chitosan-modified clay showed a decrease of decomposition rate in composting test in comparison to pristine thermoplastic starch.

http://dx.doi.org/10.21577/0103-5053.20160213

Published online: July 19, 2016


J. Braz. Chem. Soc. 2017, 28(4), 659-668

Concentration Profiles of Regulated and Unregulated Pollutants Emitted from the Combustion of Soybean Biodiesel and Diesel/Biodiesel Blend Originating of a Diesel Cycle Engine

Beatriz S. Amaral; Luciana M. B. Ventura; Ariane S. Amaral; Francisco R. A. Neto; Adriana Gioda

How to cite this article

 

This figure shows the concentration profiles of emitted pollutants in biofuels and blends from a stationary engine.

http://dx.doi.org/10.21577/0103-5053.20160216

Published online: July 22, 2016


J. Braz. Chem. Soc. 2017, 28(4), 669-675

Modification of Vietnam Natural Rubber via Graft Copolymerization with Styrene

Tran Anh Dung; Nguyen Thi Nhan; Nghiem Thi Thuong; Phan Trung Nghia; Yoshimasa Yamamoto; Kenichiro Kosugi; Seiichi Kawahara; Tran Thi Thuy

How to cite this article

 

The graft copolymerization of styrene onto deproteinized natural rubber has been studied. The core-shell arrangement was obtained in styrene-deproteinized natural rubber copolymer. This structure resulted in the outstanding thermal and mechanical properties of graft copolymer.

http://dx.doi.org/10.21577/0103-5053.20160217

Published online: July 22, 2016

Short Report J. Braz. Chem. Soc. 2017, 28(4), 676-680

Influence of Water and Ultraviolet Irradiation on the Induction Period of the Oxidation of Biodiesel

Willian L. G. da Silva; Acacia A. Salomão; Marta M. D. C. Vila; Matthieu Tubino

How to cite this article

 

How light, water and oxygen can affect biodiesel during storage?

http://dx.doi.org/10.5935/0103-5053.20160202

Published online: July 7, 2016

J. Braz. Chem. Soc. 2017, 28(4), 681-688

New Strategies for Molecular Diversification of 2-[Aminoalkyl-(1H-1,2,3-triazol-1-yl)]-1,4-naphthoquinones Using Click Chemistry

Ronaldo N. de Oliveira; Mauro G. da Silva; Moara Targino da Silva; Valentina N. Melo; Wagner O. Valença; Josinete Angela da Paz; Celso A. Camara

How to cite this article

 

Click-chemistry protocol aims to access molecular diversity based on two strategies to obtain scaffolds of 2-amino-alkyl substituted natural and synthetic 1,4-naphthoquinones linked to the 1,2,3-triazole heterocyclic ring.

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

Published online: July 13, 2016


J. Braz. Chem. Soc. 2017, 28(4), 689-693

Smartphone for Point-of-Care Quantification of Protein by Bradford Assay

Camila L. de Camargo; Marcia B. R. Vicentini; Angelo L. Gobbi; Diego S. T. Martinez; Renato S. Lima

How to cite this article

 

The use of a negatoscope to illuminate the samples was a simple, low cost and effective output to suppress the interferences from external light.

http://dx.doi.org/10.21577/0103-5053.20160214

Published online: July 19, 2016

Online version ISSN 1678-4790 Printed version ISSN 0103-5053
Journal of the Brazilian Chemical Society
JBCS Editorial and Publishing Office
University of Campinas - UNICAMP
13083-970 Campinas-SP, Brazil

Tel/Fax: +55.19.3521.3151
Free access

GN1