JBCS

19:05, Sat Jan 18

Open Access/APCs

Forthcoming Papers - 2020

Articles published online ahead of print




Articles J. Braz. Chem. Soc. 2020

Elemental Composition of Particulate Matter in the Southeastern Brazilian Ceramic Pole by Synchrotron Radiation X-ray Fluorescence Technique (SR-XRF)

Thiago A. Dourado; Hendryk Gemeiner; Ana Carla F. Gomes; Eduardo Almeida; Adivania C. da Silva; Nayara Valadão; Amauri Antônio Menegário ; José Silvio Govone; Didier Gastmans

The figure illustrates the procedure for sampling of PM10 (particulate matter with diameters lower than 10 µm) and PM2.5 (particulate matter with diameters lower than 2.5 µm) in Rio Claro emphasizing the vicinity of the city to a big ceramic industry pole. Furthermore, the synchrotron radiation X-ray fluorescence technique is illustrated as the method for analyzing the elemental content of particulate matter (PM) together with graphics indicating the used statistical tests for the characterization and source apportionment of PM.

http://dx.doi.org/10.21577/0103-5053.20200006

Published online: January 16, 2020.
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J. Braz. Chem. Soc. 2020

Stability Indicating Method for Determination of Benznidazole and Its Degradation Products in Active Pharmaceutical Ingredient

Wilton H. Kawaguchi; Mariana M. Fachi; Leticia B. Cerqueira; Michel L. Campos; Alan G. Gonçalves; Angela C. L. B. Trindade; Iara J. M. Reason; Roberto Pontarolo

Chromatograms obtained for benznidazole after acid, alkaline, oxidative and photolytic condition.

http://dx.doi.org/10.21577/0103-5053.20200005

Published online: January 15, 2020.
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J. Braz. Chem. Soc. 2020

Determination of Copper and Cadmium in Petroleum Produced Formation Water by Electrothermal Atomic Absorption Spectrometry after Cloud Point Extraction

Valdinei S. Souza ; Leonardo S. G. Teixeira; Queila O. Santos; Ivaldo S. Gomes; Marcos A. Bezerra

Cloud point extraction procedure for Cu and Cd determination in petroleum produced-formation water samples using graphite furnace atomic absorption spectrometry (GF AAS).

http://dx.doi.org/10.21577/0103-5053.20200004

Published online: January 14, 2020.
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J. Braz. Chem. Soc. 2020

Synthesis, Antileishmanial Activity and Spin Labeling EPR Studies of Novel β-Carboline-Oxazoline and β-Carboline-Dihydrooxazine Derivatives

Paula Baréa ; Jéssica C. de Paula; Laís Alonso; Aline R. de Oliveira; Willian F. da Costa; Antonio Alonso; Celso V. Nakamura; Maria H. Sarragiotto

Novel β-carbolines with oxazoline and dihydrooxazine groups at C-3 showed significant activity against Leishmania amazonensis, causing strong stiffness in the parasite plasma membrane.

http://dx.doi.org/10.21577/0103-5053.20200003

Published online: January 10, 2020.
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J. Braz. Chem. Soc. 2020

Matrix Effects on the Degradation of Gemfibrozil, Hydrochlorothiazide, and Naproxen by Heterogeneous Photocatalysis

Cleiseano E. S. Paniagua; Eduardo O. Marson; Ivo A. Ricardo; Vinícius A. B. Paiva; Bárbara R. Gonçalves; Alam G. Trovó

The matrix components affected directly the operational conditions of heterogeneous photocatalysis, the rate constants and removal efficiency of the pharmaceuticals (gemfibrozil, hydrochlorothiazide and naproxen), and toxicity.

http://dx.doi.org/10.21577/0103-5053.20200002

Published online: January 9, 2020.
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J. Braz. Chem. Soc. 2020

Application of Mixture Design Using Diluted Acid for Extraction of Inorganic Components in Fruits of Casearia fasciculata and Determination by ICP OES: Evaluation by PCA and HCA

Ivana L. S. Romão; Franciele C. Novais; Rosivan S. Assis; Vinnícius H. C. da Silva; Raildo M. de Jesus; Cleber G. Novaes ; Ana M. P. dos Santos

A method of digestion with dilute nitric acid was optimized by mixture design for the extraction of elements in the seed, peel, and pulp of Casearia fasciculata. Chemometrics tools such as principal component analysis and hierarchical cluster analysis were efficient in the formation of groups, corresponding to the fruit parts.

http://dx.doi.org/10.21577/0103-5053.20200001

Published online: January 7, 2020.
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J. Braz. Chem. Soc. 2019

Determination and Risk Assessment of Formaldehyde and Acetaldehyde in the Ambient Air of Gas Stations in Salvador, Bahia, Brazil

Lícia P. S. Cruz ; Sâmeque R. Luz; Vânia P. Campos; Franciele O. Santana; Raiane S. Alves

Formaldehyde and acetaldehyde were determined in the ambient air of gas stations and human health risks for workers exposed to these compounds were estimated.

http://dx.doi.org/10.21577/0103-5053.20190278

Published online: December 20, 2019.
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J. Braz. Chem. Soc. 2019

Pyrolysis of the Caupi Bean Pod (Vigna unguiculata): Characterization of Biomass and Bio-Oil

Roberta M. Santos; Diego F. Bispo; Honnara S. Granja; Eliana M. Sussuchi ; André Luis D. Ramos; Lisiane S. Freitas

The bean pod (Vigna unguiculata) was submitted to pyrolysis, and its bio-oil chemical composition was evaluated.

http://dx.doi.org/10.21577/0103-5053.20190277

Published online: December 20, 2019.
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J. Braz. Chem. Soc. 2019

Effects of Soil and Vineyard Characteristics on Volatile, Phenolic Composition and Sensory Profile of Cabernet Sauvignon Wines of Campanha Gaúcha

Karine P. Nicolli; Aline C. T. Biasoto ; Celito C. Guerra; Henrique P. dos Santos; Luiz C. Correa ; Juliane E. Welke ;
Cláudia A. Zini

C1 Cabernet Sauvignon grapes provided the best sensory attributes among 5 vineyards located across Campanha Gaúcha and they were correlated to volatiles, as well as phenolic compounds using gas chromatography (GC) and GC × GC-MS (two-dimensional GC with mass spectrometry), GC-O-Osme (GC-olfactometry-Osme technique), DA (descriptive analysis), LC-DAD-FLD (liquid chromatography-diode array detector-fluorescence detector) and to favorable climate/soil characteristics.

http://dx.doi.org/10.21577/0103-5053.20190276

Published online: December 19, 2019.
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J. Braz. Chem. Soc. 2019

Simultaneous Transfer of Na+, K+, and Fe2+ Ions During Salting of Precooked Mushroom
(Agaricus bisporus): Mathematical Modeling, Optimization and Experimental Validation

Mirian S. P. Bordin; Hágata Cremasco; Diego Galvan ; Marco A. J. Clemente; Evandro Bona ; Ana Carolina G. Mantovani; Dionisio Borsato

The mass transfer during champignon mushroom salting was modeled by the finite element method (FEM).

http://dx.doi.org/10.21577/0103-5053.20190275

Published online: December 19, 2019.
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J. Braz. Chem. Soc. 2019

Evaluation of Carbon Nanotubes/Polyaniline Thin Films for Development of Electrochemical Sensors

Fabio S. Lisboa ; Eduardo G. C. Neiva ; Marcio F. Bergamini ; Luiz H. Marcolino Junior ; Aldo J. G. Zarbin

Carbon nanotubes/polyaniline thin films as electrochemical sensor have improved sensitivity and limits of detection when compared to neat materials films.

http://dx.doi.org/10.21577/0103-5053.20190274

Published online: December 18, 2019.
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J. Braz. Chem. Soc. 2019

Theoretical and Experimental Investigations on Inclusion Complex β-Cyclodextrin and Sulcatone: A Cardiovascular Activity Evaluation

Ivan S. Silva; Eduardo L. Feitosa; Márcio E. P. Santos; Raiane M. Silva; Márcio S. Rocha; Francisco I. da Silva; Francisco C. A. Lima; Ana Maria S. Costa; Péricles B. Alves; Samuel A. A. de Sousa; Aldeídia P. Oliveira; Sidney G. de Lima

Sulcatone inclusion complex/β-cyclodextrin (β-CD): physicochemical characterization, theoretical study and evaluation of vasorelaxant activity.

http://dx.doi.org/10.21577/0103-5053.20190273

Published online: December 12, 2019.
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J. Braz. Chem. Soc. 2019

Determination of Methanol in Gasoline and Ethanol Fuels by High-Performance Liquid Chromatography

Gabriella P. Dias; Rafael C. dos Santos; Renato C. Carvalho; Cristiane G. de Souza; Amanda P. F. dos Santos; Débora F. de Andrade; Luiz A. d'Avila

Simple and fast methodology for detection and quantification of adulterant methanol in gasoline and ethanol fuel.

http://dx.doi.org/10.21577/0103-5053.20190272

Published online: December 12, 2019.
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J. Braz. Chem. Soc. 2019

3-Aminofurostane Alkaloids from Solanum paniculatum ("Jurubeba Verdadeira") Roots

Tania M. S. Silva; Telma M. G. Silva; Maria F. Agra; Celso A. Camara

Novel aminofurostane alkaloids were identified from Solanum paniculatum roots.

http://dx.doi.org/10.21577/0103-5053.20190269

Published online: December 10, 2019.
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J. Braz. Chem. Soc. 2019

Assessment of Atmospheric PM10 Pollution Levels and Chemical Composition in Urban Areas near the 2016 Olympic Game Arenas

Elizanne P. S. Justo; Maria Fernanda C. Quijano; Karmel Beringui; Tatiana D. Saint'Pierre; Adriana Gioda

This work describes the sampling and chemical analysis scheme of collected particulate matter (PM) and the study site picture.

http://dx.doi.org/10.21577/0103-5053.20190270

Published online: December 6, 2019.
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J. Braz. Chem. Soc. 2019

Variability of the Volatile Organic Compounds of Achillea millefolium L. According to the Collection Time, Type of Polyethylene Packaging and Storage Period

Aurilene A. Vasconcelos; Elenilson G. Alves Filho; Tigressa H. S. Rodrigues; Adriely F. Vieira; Renato Innecco; Gisele S. Silva; Guilherme J. Zocolo

The metabolic profile of Achillea millefolium essential oil by chemometric analysis on gas chromatography-mass spectrometry (GC-MS) data in six different collection times and five storage periods, employing three different polyethylene packages, viz. white, silver and black.

http://dx.doi.org/10.21577/0103-5053.20190268

Published online: December 3, 2019.
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J. Braz. Chem. Soc. 2019

Regenerated Cellulose Membrane from Peanut Shell for Biodiesel Purification

Ana Maria S. Reis; Andressa T. Vieira; Allyson L. R. Santos; Marcos V. Ferreira; Antônio C. F. Batista; Rosana M. N. Assunção; Guimes Rodrigues Filho; Elaine A. M. Ribeiro; Anizio M. Faria

Preparation of regenerated cellulose membrane from peanut shell for purification of biodiesel.

http://dx.doi.org/10.21577/0103-5053.20190267

Published online: December 2, 2019.
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J. Braz. Chem. Soc. 2019

Synthesis, Characterization and in vitro, in vivo and in silico Anti-Inflammatory Studies of the Novel Hybrid Based on Ibuprofen and 3-Hydroxy-Copalic Acid Isolated from Copaiba Oil (Copaifera multijuga)

Fábio C. de Souza; Larissa F. Brito; Marcos T. Silva; Michelle A. Sugimoto; Ana Cristina S. Pinto; Patrícia D. O. de Almeida; Rodrigo O. S. Souza; Renyer A. Costa; Fernanda Guilhon-Simplicio ; Almir G. Wanderley; Kelson M. T. de Oliveira; Lirlândia P. Sousa; Valdir F. da Veiga-Junior ; Emerson S. Lima

Pleurisy inhibition and gastroprotective in vivo effects, in vitro cytotoxicity, inhibition of tumor necrosis factor (TNF) and in silico assays (docking with enzyme cyclooxygenase (COX)) were performed to the novel hybrid of ibuprofen and 3-hydroxy-copalic acid isolated from copaiba oil.

http://dx.doi.org/10.21577/0103-5053.20190266

Published online: November 26, 2019.
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J. Braz. Chem. Soc. 2019

Combretastatin A-4: The Antitubulin Agent that Inspired the Design and Synthesis of Styrene and Spiroisatin Hybrids as Promising Cytotoxic, Antifungal and Antiviral Compounds

Yaneth M. Brand ; Vladimir V. Kouznetsov ; Carlos E. Puerto ; Vicky C. R. Linares ; Verónica T. Castaño; Liliana Betancur-Galvis

A series of combretastatin A-4 hybrids were designed, synthesized and evaluated in order to explore new cytotoxic, antifungal and antiviral agents.

http://dx.doi.org/10.21577/0103-5053.20190265

Published online: November 26, 2019.
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J. Braz. Chem. Soc. 2019

Chitosan and Agaricus brasiliensis Polysaccharides Films: A Preliminary Study

Maria L. C. Gonzaga; Matheus S. Campelo; Katarina B. Saraiva; Alan Q. S. Santos; Luzia K. A. M. Leal; Nágila M. P. S. Ricardo; Sandra A. Soares; Maria Elenir N. P. Ribeiro

Polysaccharide films of Agaricus brasiliensis mushroom for wound care.

http://dx.doi.org/10.21577/0103-5053.20190264

Published online: November 25, 2019.
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J. Braz. Chem. Soc. 2019

Specific Disulfide Bond Formation Directed by Peptide Nucleic Acids

Lin Cai; Wen Hou

Peptides were linked to the pair of complementary peptide nucleic acid (PNAs) by native chemical ligation, respectively, and base pairing drove the two peptides into close proximity for interchain disulfide bond formation.

http://dx.doi.org/10.21577/0103-5053.20190263

Published online: November 22, 2019.
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J. Braz. Chem. Soc. 2019

Zn2Al Layered Double Hydroxides Intercalated with Nitrate and p-Aminobenzoate as Ultraviolet Protective Agents in Low-Density Polyethylene Nanocomposites and Natural Insulating Oils

Neffer A. G. Gómez; Gabriel M. Silva; Helena M. Wilhelm; Fernando Wypych

Zn2Al layered double hydroxides were used as ultraviolet oxidation protectors in low density polyethylene and natural insulating oils.

http://dx.doi.org/10.21577/0103-5053.20190262

Published online: November 21, 2019.
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J. Braz. Chem. Soc. 2019

An Alternative Spectrophotometric Determination of Carbaryl Insecticide Residues in Water Samples Using the Cerium-Catalyzed Belousov-Zhabotinsky Oscillating Reaction

Titikan Somboon ; Yanawath Santaladchaiyakit; Sira Sansuk; Supalax Srijaranai

Spectrophotometric determination of carbaryl using the cerium-catalyzed Belousov-Zhabotinsky reaction.

http://dx.doi.org/10.21577/0103-5053.20190261

Published online: November 19, 2019.
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J. Braz. Chem. Soc. 2019

Synthesis, in silico Study and Antimicrobial Evaluation of New Diesters Derived from Phthaloylglycine

Rafael F. de Oliveira ; Helivaldo D. S. Souza; Francinara S. Alves; Abraão P. de Sousa; Priscila S. V. de Lima; Min-Fu N. Huang; Laísa V. Cordeiro; Hermes Diniz Neto ; Edeltrudes O. Lima; Emmely O. Trindade; José M. Barbosa-Filho ; Petrônio F. de Athayde‑Filho

New diesters compounds derived from phthaloylglycine and their use in medicinal chemistry are still unpublished. Due to the increase in antimicrobial resistance, new categories of substances with potential biological activity against pathogenic microorganisms have been increasingly studied.

http://dx.doi.org/10.21577/0103-5053.20190260

Published online: November 19, 2019.
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J. Braz. Chem. Soc. 2019

Chemically-Activated Biochar from Ricinus communis L. Cake and Their Potential Applications for the Voltammetric Assessment of Some Relevant Environmental Pollutants

Cristiane Kalinke; Paulo R. de Oliveira; Antonio S. Mangrich ; Luiz H. Marcolino‑Junior; Márcio F. Bergamini

Castor bean activated biochar was characterized and used for electrodes construction for voltammetric application.

http://dx.doi.org/10.21577/0103-5053.20190259

Published online: November 19, 2019.
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J. Braz. Chem. Soc. 2019

In silico Risk Assessment Studies of New Psychoactive Substances Derived from Amphetamines and Cathinones

Eduardo B. de Melo ; João P. A. Martins ; Caio H. P. Rodrigues ; Aline T. Bruni

This paper aims to create a program using Java programming language for-log of half maximal inhibitory concentration (pIC50) prediction of amphetamines and cathinones using the fundamentals of quantitative structure-activity relationship (QSAR).

http://dx.doi.org/10.21577/0103-5053.20190258

Published online: November 13, 2019.
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J. Braz. Chem. Soc. 2019

Methodology Development and Validation of Amphotericin B Stability by HPLC‑DAD

Marciela B. Montenegro; Stefânia P. de Souza; Raquel A. C. Leão; Helvécio V. A. Rocha; Claudia M. de Rezende; Rodrigo O. M. A. de Souza

This is amphotericin B (AMB), an antibiotic highly unstable. For this reason, the objective of this work is the development of an indicative method of stability for AMB.

http://dx.doi.org/10.21577/0103-5053.20190256

Published online: November 7, 2019.
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Short Report J. Braz. Chem. Soc. 2019

Easy Epoxidation of Monoterpenes from Common Starting Materials

John H. Bermudez; Giovanni Rojas ; Ricardo B. Benitez; Jaime M. Franco

Epoxidation of monoterpenes by the in situ production of a peroxyacid without the use of catalyst at room temperature produced up to 75% pure epoxide.

http://dx.doi.org/10.21577/0103-5053.20190253

Published online: October 30, 2019.
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Articles J. Braz. Chem. Soc. 2019

Simple GFAAS Method for Determination of Pb, As, and Cd in Cannabidiol Extracts Used for Therapeutic Purposes

Patricia A. Nascimento; Juliana Schultz; Mario H. Gonzalez; Andrea Oliveira

There is increasing permitted use worldwide of cannabidiol (CBD) extracts for medical purposes, such as the treatment of epilepsy and other chronic diseases. It is therefore necessary to be able to determine the inorganic chemical compositions of these formulations.

http://dx.doi.org/10.21577/0103-5053.20190252

Published online: October 29, 2019.
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J. Braz. Chem. Soc. 2019

Assessment of Reaction Parameters in the Polymeric Carbon Nitride Thermal Synthesis and the Influence in Photocatalytic Hydrogen Production

Dalila S. Monteiro; Marcus Vinicius S. Silva; Luciana A. Silva

Thiourea thermally treated for longer time with intermediary heating rate gave rise to the most active photocatalyst for hydrogen production, S-doped polymeric carbon nitride (PCN).

http://dx.doi.org/10.21577/0103-5053.20190251

Published online: October 29, 2019.
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Short Report J. Braz. Chem. Soc. 2019

Influence of the Capping Agent PVP of the Outer Layer of Pd Nanocubes Surface on the Catalytic Hydrogenation of Unsaturated C−C Bonds

Suelen C. Buratto; Eloah Latocheski; Daniela C. de Oliveira; Josiel B. Domingos

The number of washing cycles in the removal of capping agent polyvinylpyrrolidone (PVP) excess present in the outer layers of palladium nanocubes, in the post-synthesis purification step, is shown to strongly affect the catalytic activity on the hydrogenation reaction of unsaturated C−C bonds.

http://dx.doi.org/10.21577/0103-5053.20190250

Published online: October 29, 2019.
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Articles J. Braz. Chem. Soc. 2019

Crystal Structure and 1H NMR Experimental and Theoretical Study of Conformers of 5-Methyl-1-(4'-methylphenylsulfonylamino)-1H-[1,2,3]-triazole-4-carboxylic Acid Ethyl Ester and 5-Methyl-1-(phenylsulfonylamino)-1H-[1,2,3]-triazole-4-carboxylic Acid Ethyl Ester

Maria C. R. Freitas ; Vinicius R. Campos; Jackson A. L. C. Resende; Marcos M. P. da Silva; Vitor F. Ferreira; Anna Claudia Cunha; José W. M. Carneiro; Mateus R. Lage; Leonardo A. de Souza; Haroldo C. Silva; Wagner B. de Almeida

Experimental and density functional theory (DFT) simulated evidences of conformational change of 1,2,3-triazole from solid form to CDCl3 solution.

http://dx.doi.org/10.21577/0103-5053.20190249


J. Braz. Chem. Soc. 2019

Isolation, in vitro and in silico Evaluation of Phenylethanoid Glycoside from Arrabidaea brachypoda as Lipoxygenase Inhibitor

Camila S. Bertanha; Valéria M. M. Gimenez; Ricardo A. Furtado; Denise C. Tavares; Wilson R. Cunha; Márcio L. Andrade e Silva ; Ana H. Januario ; Alexandre Borges; Daniel F. Kawano; Renato L. T. Parreira ; Patrícia M. Pauletti

Obtention of conandroside as a promising lipoxygenase inhibitor in an in vitro assay and molecular docking analysis.

http://dx.doi.org/10.21577/0103-5053.20190248

Published online: October 22, 2019.
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J. Braz. Chem. Soc. 2019

Structural and Functional Stabilization of Sericin from Bombyx mori Cocoons in a Biopolysaccharide Film: Bioorigami for Skin Regeneration

Victor M. Balcão; Liliam K. Harada; Ludmilla R. Jorge; José M. Oliveira Jr.; Matthieu Tubino; Marta M. D. C. Vila

Sericin extracted from Bombyx mori cocoons was used for the development of a film for use in human skin.

http://dx.doi.org/10.21577/0103-5053.20190247

Published online: October 21, 2019.
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J. Braz. Chem. Soc. 2019

Synthesis of Glycerol-Derived 4-Alkyl-Substituted 1,2,3-Triazoles and Evaluation of Their Fungicidal, Phytotoxic, and Antiproliferative Activities

Adilson V. Costa ; Luiza C. Moreira; Roberta T. Pinto; Thammyres A. Alves; Vitor V. Schwan; Vagner T. de Queiroz; Milene M. Praça-Fontes ; Róbson Ricardo Teixeira ; Pedro A. B. Morais; Waldir C. de Jesus Júnior

Nine 1,2,3-triazole derivatives were synthesized and had their fungicidal, phytotoxic and antiproliferative activities evaluated.

http://dx.doi.org/10.21577/0103-5053.20190246

Published online: October 16, 2019.
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J. Braz. Chem. Soc. 2019

Insecticidal and Acaricidal Activity of Essential Oils Rich in (E)-Nerolidol from Melaleuca leucadendra Occurring in the State of Pernambuco (Brazil) and Effects on Two Important Agricultural Pests

Milena M. C. da Silva; Claudio A. G. da Camara; Marcilio M. de Moraes; João P. R. de Melo; Rodrigo B. dos Santos; Roberta C. S. Neves

Essential oils rich in (E)-nerolidol were identified in different parts of M. leucadendra from Pernambuco, Brazil. Essential oils presented high toxicity against adults and eggs of T. urticae and P. xylostella

http://dx.doi.org/10.21577/0103-5053.20190245

Published online: October 15, 2019.
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J. Braz. Chem. Soc. 2019

Optimization of Alkaline, Acidic, Ionic Liquid and Oxidative Pretreatments for Coconut Waste Conversion into Fermentable Sugars

Magale K. D. Rambo ; Polyana M. de Melo ; Márcia M. C. Ferreira; Michele C. D. Rambo; Daniel A. Bertuol; Victor L. Mota

Four different pretreatments were optimized and tested in coconut waste, to evaluate its potential as source of fermentable sugars.

http://dx.doi.org/10.21577/0103-5053.20190254

Published online: October 31, 2019.
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J. Braz. Chem. Soc. 2019

Chitosan-Sodium Alginate Polyelectrolyte Complex Coating Pluronic® F127 Nanoparticles Loaded with Citronella Essential Oil

Mariele P. Sanches; Idejan P. Gross; Rodrigo H. Saatkamp; Alexandre L. Parize; Valdir Soldi

The present study reports the high encapsulation efficiency and the in vitro release study of citronella essential oil in Pluronic® F127 nanoparticles coated with chitosan-sodium alginate polyelectrolyte complex.

http://dx.doi.org/10.21577/0103-5053.20190244

Published online: October 14, 2019.
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J. Braz. Chem. Soc. 2019

Study of Thermoplastic Extrusion and Its Impact on the Chemical and Nutritional Characteristics in Two Sorghum Genotypes SC 319 and BRS 332

Flávia A. Campelo; Gilberto S. Henriques; Maria Lucia F. Simeone ; Valéria A. V. Queiroz; Mauro R. Silva; Rodinei Augusti ; Júlio O. F. Melo ; Inayara C. A. Lacerda; Raquel L. B. Araújo

Evaluation of the effect of extrusion on the discrimination of Sorghum bicolor by paper spray mass spectrometry.

http://dx.doi.org/10.21577/0103-5053.20190243

Published online: October 14, 2019.
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J. Braz. Chem. Soc. 2019

Metabolomics-Based Discovery of Biomarkers with Cytotoxic Potential in Extracts of Myracrodruon urundeuva

Caio B. Castro; Licia R. Luz; Jhonyson A. C. Guedes ; Diogo D. Porto; Maria Francilene S. Silva; Gisele S. Silva; Paulo R. V. Ribeiro; Kirley M. Canuto ; Edy S. Brito ; Dávila S. Zampieri; Claúdia Ó. Pessoa; Guilherme J. Zocolo

Chemical identification and determination of the biomarkers associated with the cytotoxic potential of extracts.

http://dx.doi.org/10.21577/0103-5053.20190242

Published online: October 10, 2019.
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J. Braz. Chem. Soc. 2019

Ab initio Study of 17α-Ethinylestradiol and Estrone Molecules Interacting with Single Wall Carbon Nanotube

Shuanne M. Castro; Herisson C. Ribeiro; Adriana B. Araújo; Silvete Guerini

Band structure and local density of states (LDOS), around the Fermi level, for (8.0) single wall carbon nanotube (SWCNT) plus ethinylestradiol molecule and estrone molecule, in most stable configurations.

http://dx.doi.org/10.21577/0103-5053.20190241

Published online: October 10, 2019.
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J. Braz. Chem. Soc. 2019

Residue-Based CaO Heterogeneous Catalysts from Crab and Mollusk Shells for FAME Production Via Transesterification

Claudia Cristina Cardoso ; Alexsandro S. Cavalcanti; Ricardo O. Silva; Severino Alves Junior; Fabiana P. de Sousa; Vânya Marcia D. Pasa; Santiago Arias; Jose G. A. Pacheco

Different species of fishery residues present excellent catalytic activities in the synthesis of biodiesel and can represent a technological-socio-environmental solution for the coastal community of the Northeastern of Brazil.

http://dx.doi.org/10.21577/0103-5053.20190240

Published online: October 8, 2019.
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J. Braz. Chem. Soc. 2019

Ultrasound-Promoted Synthesis, Structural Characterization and in vitro Antimicrobial Activity of New
5-Aryl-3-(2-hydroxyphenyl)-4,5-dihydro-1H-pyrazole-1-carboximidamides

Danilo Y. de Albuquerque; Andressa C. Damim; Eliandro Faoro; Gleison A. Casagrande; Davi F. Back; Sidnei Moura; Claudio M. P. de Pereira; Kelly M. P. de Oliveira; Lucas Pizzuti

Thirteen new amidino pyrazolines were synthesized under ultrasound in 15-83% yield. Some examples showed promising antibacterial activity.

http://dx.doi.org/10.21577/0103-5053.20190239

Published online: October 8, 2019.
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J. Braz. Chem. Soc. 2019

Fast and Ecological Liquid-Liquid Separation Method for Preparing Quinones Enriched Extract from Nigella sativa Oil

Klara Urbanova; Pavel Kloucek; Jaroslav Havlik; Irena Valterova; Ladislav Kokoska

A fast, inexpensive, and ecological method for preparation of extract with high content of Nigella sativa quinones.

http://dx.doi.org/10.21577/0103-5053.20190238

Published online: October 8, 2019.
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J. Braz. Chem. Soc. 2019

The Comparative Investigation of Corrosion and Passivation for X65 Carbon Steel in pH 1 to 5 HNO3 Solutions without and with 0.01 mol L-1 NaNO2

Rongjiao Deng; Pei Zhang; Xiaoying Zhao; Guanyu Cai; Hui Liu; Jinping Xiong ; Yong Zhou

With the addition of 0.01 mol L-1 NaNO2 in pH 1 to 5 HNO3 solutions, the electrochemical behavior of X65 carbon steel transferred from the activation in the solutions free of NaNO2 to the passivation in the solutions containing NaNO2.

http://dx.doi.org/10.21577/0103-5053.20190237

Published online: October 7, 2019.
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J. Braz. Chem. Soc. 2019

Metabolization of Insecticidal Amides from Leaves of Piper tuberculatum by Heraclydes hectorides and Naupactus bipes

Clécio S. Ramos ; Marcílio W. F. Silva; Marcilio M. Moraes; Argus V. Almeida; Sérgio A. Vanin; Massuo J. Kato

The amides from leaves of Piper tuberculatum are hydrolyzed by the weevil N. bipes and by caterpillars of H. hectorides but not bygeneralist grasshoppers.

http://dx.doi.org/10.21577/0103-5053.20190236

Published online: October 7, 2019.
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J. Braz. Chem. Soc. 2019

Chemometric Optimization of the Methodology for Determination of Molybdenum in Soils and Plants by Square Wave Adsorptive Stripping Voltammetry

José Ricardo de Carvalho; Efraim Lázaro Reis ; César Reis; Odilaine Inácio C. Damasceno; Antônio Augusto Neves ; Alexsandro Antônio Matias

A voltammetric method was developed based on the adsorption of the complex of molybdenum(VI) with 8-hydroxyquinoline, using square wave cathodic stripping voltammetry. The concentration of the support electrolyte, frequency, amplitude and deposition time were optimized by factorial design in relation to the reduction of molybdenum(VI) current. The results obtained for the determination of MoVI in soils and leaves of vegetables show good agreement.

http://dx.doi.org/10.21577/0103-5053.20190235

Published online: October 3, 2019.
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J. Braz. Chem. Soc. 2019

New Allyldithiocarbimates: Synthesis, Structure and Antifungal Activity against Phakopsora pachyrhizi and Hemileia vastatrix

Antonio E. C. Vidigal; Mayura M. M. Rubinger; Lucas F. da Silva; Laércio Zambolim; Arthur B. D. Pereira; Silvana Guilardi; Rafael A. C. Souza; Javier Ellena

New tetraphenylphosphonium (Z)-allyldithiocarbimates synthesized inhibit the germination of phytopathogenic fungi.

http://dx.doi.org/10.21577/0103-5053.20190234

Published online: October 3, 2019.
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J. Braz. Chem. Soc. 2019

Near-Infrared Luminescence from Visible-Light-Sensitized Ruthenium(II)‑Neodymium(III) Heterobimetallic Bridged Complexes Containing Alkoxy(silyl) Functional Groups

Rafael M. Sábio ; Silvia H. Santagneli; Marie Gressier; José M. A. Caiut; Wallance M. Pazin; Robson R. Silva; Sidney J. L. Ribeiro; Marie-Joëlle Menu

The successful fabrication of two silylated ruthenium(II)-neodymium(III) heterobimetallic complexes with excellent photophysical properties allow grafting onto any silicated matrix suggesting their application as new luminescent near infrared (NIR)-emitting biolabels.

http://dx.doi.org/10.21577/0103-5053.20190233

Published online: October 1, 2019.
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J. Braz. Chem. Soc. 2019

Spatial and Temporal Effects of Decommissioning a Zinc Smelter on the Sediment Quality of an Estuary System: Sepetiba Bay, Rio de Janeiro, Brazil

Rodrigo A. Gonçalves; Douglas F. Oliveira; Carlos Eduardo Rezende; Phelipe Almeida; Luiz D. de Lacerda; Bernardo A. P. da Gama; José Marcus Godoy

Environmental actions, related to the Ingá Mercantil legacy, led to a Zn reduction in surface sediments.

http://dx.doi.org/10.21577/0103-5053.20190232

Published online: September 27, 2019.
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J. Braz. Chem. Soc. 2019

Geochemical Investigation of Tar Balls Collected in a Brazilian Beach Using Biomarkers, Ni/V, δ13C Ratios and Ultra-High Resolution FT‑ICR Mass Spectrometry

Bárbara D. Lima; Laercio L. Martins; Lívia C. Santos; Eliane S. de Souza; Marcos A. Pudenzi; Heliara L. Nascimento; Marcos N. Eberlin; Georgiana F. da Cruz

Geochemical investigation of tar balls collected in two distinct years (2012 and 2014) in a Brazilian beach using several analytical techniques suggesting that the area is subjected to frequent spill from the same source.

http://dx.doi.org/10.21577/0103-5053.20190231

Published online: September 26, 2019.
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J. Braz. Chem. Soc. 2019

A Protocol for Fish Lipid Analysis Using Nuclear Magnetic Resonance Spectroscopy

Natalia Cristina Mor; Banny S. B. Correia; Adalberto Luis Val; Ljubica Tasic

An easy-to-follow methodology for fish lipids analysis by nuclear magnetic resonance (NMR) spectroscopy is presented. Biological sample collection, sample preparation, lipid extraction, NMR spectroscopy analysis, statistical data analysis and the care needed in each step execution are explained in detail.

http://dx.doi.org/10.21577/0103-5053.20190230

Published online: September 26, 2019.
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J. Braz. Chem. Soc. 2019

Potential Slow Release Fertilizers Based on K2MgSiO4 Obtained from Serpentinite

Fabiane C. Ballotin; Wedisson O. Santos; Edson M. Mattiello; Ottávio Carmignano; Ana Paula C. Teixeira; Rochel M. Lago

K2MgSiO4 was produced by impregnation of serpentinite rock with KOH and thermal treatment. New materials released K in a slow rate than KCl, showing potential as slow release K-fertilizers.

http://dx.doi.org/10.21577/0103-5053.20190229

Published online: September 25, 2019.
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J. Braz. Chem. Soc. 2019

Upconversion 3D Printed Composite with Multifunctional Applications for Tissue Engineering and Photodynamic Therapy

Karina Nigoghossian ; Sybele Saska; Livia M. Christovam; Fernanda Coelho; Cesar Augusto G. Beatrice; Alessandra A. Lucas; Paulo I. Neto; Jorge Vicente L. da Silva; Agnieszka Tercjak ; Maurício S. Baptista; Luiz Henrique Catalani; Raquel M. Scarel-Caminaga; Ticiana S. O. Capote; Sidney José L. Ribeiro

Erythrosine photosensitizer (PS)-containing polycaprolactone (PCL)/upconversion nanoparticles (UCNPs)-apatite composite for biomedical applications in the therapy-stimulated bone repair and photodynamic therapy (PDT).

http://dx.doi.org/10.21577/0103-5053.20190228

Published online: September 23, 2019.
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J. Braz. Chem. Soc. 2019

A Selective Gas Chromatography-Selected Ion Monitoring Mass Spectrometry (GC‑MS/SIM) Method to Determine Polychlorinated Biphenyls in Fuller's Earth

Melina Espanhol-Soares ; Milady R. A. Silva; Rossano Gimenes; Flávio S. Silva

A methodology was developed for improved separation and detection of polychlorinated biphenyls (PCBs) in Fuller's earth, in a relatively short time, with high chromatographic resolution and selectivity. A total of 83 PCBs could be identified using a single chromatography method.

http://dx.doi.org/10.21577/0103-5053.20190227

Published online: September 23, 2019.
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J. Braz. Chem. Soc. 2019

TD-DFT Analysis of the Dissymmetry Factor in Camphor

Iran da L. Sousa; Gabriel Heerdt; Valdecir F. Ximenes; Aguinaldo R. de Souza; Nelson H. Morgon

Camphor is a chiral bicyclic ketone that exhibits an exceptionally high anisotropic dissymmetry factor (g-factor). It was observed accordance between the calculated value, at time-dependent density functional theory (TD-DFT) level of theory, and the experimental result, −0.09 and −0.05, respectively. This process is associated with n → π* (highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO)) electronic transition.

http://dx.doi.org/10.21577/0103-5053.20190226

Published online: September 20, 2019.
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J. Braz. Chem. Soc. 2019

Brazil Nut Oil Extraction Using Subcritical n-Propane: Advantages and Chemical Composition

Ana B. Zanqui ; Cláudia M. da Silva; Jéssica B. Ressutte; Damila R. de Morais; Jandyson M. Santos; Marcos N. Eberlin; Lúcio Cardozo-Filho; Jesuí V. Visentainer; Sandra T. M. Gomes; Makoto Matsushita

Brazil nut samples were subjected to subcritical n-propane extraction using a 23 factorial design and the chemical composition of the oil was determined and compared to the oils obtained by conventional extraction methods.

http://dx.doi.org/10.21577/0103-5053.20190225

Published online: September 20, 2019.
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J. Braz. Chem. Soc. 2019

Unexpected Rearrangement and Aromatization on Dehydration Reaction of the Bioactive Diterpenequinone 7α-Hydroxyroyleanone

Gilda G. Leitao ; Aline G. L. Pinheiro; Victor L. D. Rezende; Raphael S. F. Silva; Leonardo R. Paula; Deivid C. Soares; Elvira M. Saraiva

7α-Hydroxyroyleanone gave an unexpected product on dehydration reaction. A naphtoquinone was formed as major product along with 6,7-dehydroroyleanone and a complex mixture of compounds. The reaction products were purified by high-speed countercurrent chromatography and tested for their anti-Leishmania activity.

http://dx.doi.org/10.21577/0103-5053.20190223

Published online: September 17, 2019.
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J. Braz. Chem. Soc. 2019

Synthesis, Characterization and Photocatalytic Activity of Au/SiO2@TiO2 Core-Shell Microspheres

Chengli Yao ; Jinmiao Zhu

Au@SiO2/TiO2 core-shell structure particles were fabricated by ethanol reflux. The particles showed excellent photocatalysis activity for the degradation of methyl orange.

http://dx.doi.org/10.21577/0103-5053.20190222

Published online: September 17, 2019.
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J. Braz. Chem. Soc. 2019

Study of the Effect of Inhibitors Solutions on the Chemical Composition of Waxes by Rheology Tests and High Resolution Mass Spectrometry

Lindamara M. Souza; Samantha R. C. Silva; Paulo R. Filgueiras; Francine D. dos Santos; Géssica A. Vasconcelos;
Valdemar Lacerda Jr. ; Boniek G. Vaz; Wanderson Romao

Four oils were treated with five inhibitors solutions and evaluated by rheology. These oils were fractionated by the SAP method (saturated, aromatic and polar) and the saturated fraction was analyzed by high resolution mass spectrometry (atmospheric pressure chemical ionization using a positive ionization mode (APCI(+)) Orbitrap) and two-dimensional gas chromatography coupled to quadrupole mass spectrometry (GC x GC-qMS).

http://dx.doi.org/10.21577/0103-5053.20190221

Published online: September 17, 2019.
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J. Braz. Chem. Soc. 2019

Optimization of New Sample Preparation Technique for the Determination of Methadone and Codeine in Plasma Sample by GC-FID

Lazgin A. Jamil

In this work, the suitability of continuous sample drop flow microextraction gas chromatography-flame ionization detector (CSDF-ME-GC-FID) is studied on the extraction and evaluation of methadone and codeine in plasma sample. This method is simple, fast and consuming low amount of organic solvent. CSDF-ME is performed without hand intervention.

http://dx.doi.org/10.21577/0103-5053.20190220

Published online: September 16, 2019.
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J. Braz. Chem. Soc. 2019

Biosorption Potential of the Aspergillus sp. and Insights into Secondary Metabolism in the Presence of Copper and Lead

Maurício Augusto P. M. S. Alves; Sebastiao C. Silva; Simone Y. S. Silva; Joao B. Pereira Junior ; Patrícia S. B. Marinho; Kelly das Graças F. Dantas; Silvio Alex P. da Mota; Jessica Cristina Amaral; Maria Fátima das Graças F. da Silva ; Marilene N. Oliveira

Potential for biosorption and evaluation of secondary metabolism profile of Aspergillus sp. in potato dextrose (PD) medium enriched with CuSO4.5H2O and Pb(NO3)2.

http://dx.doi.org/10.21577/0103-5053.20190219

Published online: September 11, 2019.
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J. Braz. Chem. Soc. 2019

Synthesis of a Ce-Based MOF-76 with High Yield: A Study of Reaction Parameters Based on a Factorial Design

Patricia F. Santos ; Priscilla P. Luz

Pioneer work based on a factorial design to optimize the Ce3+-based metal-organic framework (MOF)-76 synthesis.

http://dx.doi.org/10.21577/0103-5053.20190218

Published online: September 9, 2019.
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J. Braz. Chem. Soc. 2019

Synthesis of New Phenolic-Schiff Base and Its Application as Antioxidant in Soybean Biodiesel and Corrosion Inhibitor in AISI 1020 Carbon Steel

Lucas F. Martins; Diana C. Cubides-Román; Vivian C. da Silveira; Glória M. F. V. Aquije; Wanderson Romao; Reginaldo B. dos Santos; Alvaro Cunha Neto; Valdemar Lacerda Jr.

Synthesis and application of a new phenolic-Schiff base as antioxidant for biodiesel and corrosion inhibitor for carbon steel.

http://dx.doi.org/10.21577/0103-5053.20190217

Published online: September 9, 2019.
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J. Braz. Chem. Soc. 2019

Evaluation of α- and β-Endosulfan Residues in Teas and Yerba Mate Infusions by Bar Adsorptive Microextraction and Large Volume Injection-Gas Chromatography Mass Spectrometry

Anaí L. dos Santos; Laiza C. Krause; Jaderson K. Schneider; José M. F. Nogueira; Elina B. Caramao

A bar adsorptive microextraction (BAµE) method followed by large volume injection-gas chromatography coupled to mass spectrometry (LVI-GC-MS) analysis was developed to analyze endosulfan isomers in teas and yerba mate infusions. The method provided selectivity for these pesticides. Limits of detections (LOD), limits of quantification (LOQ) and recoveries were comparable to reported techniques. LOQs were lower than the maximum residue levels (MRLs) established for endosulfan.

http://dx.doi.org/10.21577/0103-5053.20190216

Published online: September 4, 2019.
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J. Braz. Chem. Soc. 2019

Ruthenium(II)-mercapto Complexes with Anticancer Activity Interact with Topoisomerase IB

Monize M. da Silva; Mariana S. de Camargo; Silvia Castelli; Rone A. de Grandis; Eduardo E. Castellano; Victor M. Deflon; Marcia R. Cominetti; Alessandro Desideri; Alzir A. Batista

Complexes with formula: [Ru(L-L)2(dppb)]PF6, L-L = mercapto-ligands, dppb = 1,4-bis(diphenylphosphino)butane, were synthesized. In vitro cell culture experiments showed cytotoxic activity of the complexes against breast, lung, prostate and liver tumor cells.

http://dx.doi.org/10.21577/0103-5053.20190214

Published online: September 3, 2019.
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J. Braz. Chem. Soc. 2019

The Updated Brazilian National Air Quality Standards: A Critical Review

Bruno Siciliano; Guilherme Dantas; Cleyton M. da Silva; Graciela Arbilla

Do Brazilian national air quality standards (NAQS) meet the main goal of protecting public health?

http://dx.doi.org/10.21577/0103-5053.20190212

Published online: September 3, 2019.
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J. Braz. Chem. Soc. 2019

Kinetics of Lumefantrine Thermal Decomposition Employing Isoconversional Models and Artificial Neural Network

Maria B. F. Marques; Bárbara C. R. Araujo; Christian Fernandes; Maria I. Yoshida; Wagner N. Mussel ; Rita C. O. Sebastiao

Kinetics of lumefantrine thermal decomposition described by neural network and isoconversional method.

http://dx.doi.org/10.21577/0103-5053.20190211

Published online: September 3, 2019.
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J. Braz. Chem. Soc. 2019

Minutifloroside, a New Bis-Iridoid Glucoside with Antifungal and Antioxidant Activities and Other Constituents from Palicourea minutiflora

Vagner M. de Moura; Marcos A. S. Ribeiro; José G. S. Corrêa; Matheus A. Peixoto; Gredson K. Souza; Damila Morais; Patrícia S. Bonfim-Mendonça; Terezinha I. E. Svidzinski; Armando M. Pomini ; Eduardo C. Meurer; Silvana M. O. Santin

A new compound minutifloroside and three known compounds isolated from Palicourea minutiflora.

http://dx.doi.org/10.21577/0103-5053.20190209

Published online: September 2, 2019.
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J. Braz. Chem. Soc. 2019

Selective Entrapment of Pb2+ from Fresh Thunbergia laurifolia Leaves Extract and Thunbergia laurifolia Tea Extract

Soontorn Suvokhiaw; Anuwut Petdum; Natchawat Faichu; Witawas Handee; Nichanan Thepsuparungsikul; Pattanawit Swanglap; Narong Chimpalee; Nantanit Wanichacheva

Thunbergia laurifolia leaves extracts exhibited good ability to trap Pb2+ in aqueous solution.

http://dx.doi.org/10.21577/0103-5053.20190208

Published online: August 30, 2019.
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J. Braz. Chem. Soc. 2019

Screening of the Au:Pt Atomic Ratio Supported in SrCO3: Effects in the Performance of the Solvent-Free Oxidation of Benzyl Alcohol

Francisco S. C. L. Batista; Itaciara E. M. S. Melo; Laíse N. S. Pereira; Alexia G. P. Lima; Ali H. Bashal; Jean C. S. Costa; Janildo L. Magalhaes; Francisco C. A. Lima; Carla V. R. Moura; Marco A. S. Garcia; Edmilson M. Moura

Efficient and recyclable AuPt/SrCO3 catalyst for oxidation of benzyl alcohol that maintains its physical-chemical properties after catalytic runs.

http://dx.doi.org/10.21577/0103-5053.20190207

Published online: August 30, 2019.
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J. Braz. Chem. Soc. 2019

Identifying New Isatin Derivatives with GSK-3β Inhibition Capacity Through Molecular Docking and Bioassays

Karolinni B. Britto; Carla S. Francisco; Débora Ferreira; Bárbara J. P. Borges; Raphael Conti; Demetrius Profeti ;
Ligia R. Rodrigues ; Valdemar Lacerda Jr. ; Pedro A. B. Morais; Warley S. Borges

New isatin derivatives were synthesized and their GSK-3β inhibition abilities were determined.

http://dx.doi.org/10.21577/0103-5053.20190206

Published online: August 29, 2019.
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J. Braz. Chem. Soc. 2019

Application of a New Validated HPLC-PDA Method for Simultaneous Determination of Curcumin and Melatonin in Hyaluronic Acid-Coated Nanoemulsions

Edna S. Vieira; Elenara Lemos-Senna

A high-performance liquid chromatography (HPLC) method was developed and validated to simultaneously determine curcumin and melatonin in hyaluronic acid-coated nanoemulsions.

http://dx.doi.org/10.21577/0103-5053.20190205

Published online: August 28, 2019.
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J. Braz. Chem. Soc. 2019

New Detector Based on Composite of Carbon Nanotubes with Nanoparticles of Cobalt Oxide for Carbohydrates Analysis by HPLC with Reverse Pulsed Amperometric Detection

Acelino C. de Sá; Leonardo L. Paim; Nelson R. Stradiotto

The image represents the origin of bagasse of sugarcane, extraction of carbohydrates from bagasse and carbohydrates analysis using the glassy carbon electrode modified with multi-walled carbon nanotubes containing cobalt oxide nanoparticles (GCE/MWCNT/CoOOH) electrode coupled to high-performance liquid chromatography (HPLC) with reverse pulsed amperometric detection for the production of second generation ethanol.

http://dx.doi.org/10.21577/0103-5053.20190204

Published online: August 27, 2019.
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J. Braz. Chem. Soc. 2019

Determination, through Derivatization and GC-MS Analysis, of Omega-3 and Omega-6 Fatty Acids in Fish Oil Capsules Sold in Salvador, Bahia

Milena S. C. Brotas; Graziele A. Carvalho; Pedro A. P. Pereira

A gas chromatography-mass spectrometry (GC-MS) method was optimized to determine ω-3 and ω-6 fatty acids in supplements of fish oil; concentration values were compared to those informed by manufacturers.

http://dx.doi.org/10.21577/0103-5053.20190203

Published online: August 26, 2019.
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J. Braz. Chem. Soc. 2019

Chiral Amino and Imino-Alcohols Based on (R)-Limonene

Rodrigo S. Fuscaldo; Eduam O. Boeira; Rafael Stieler; Diogo S. Lüdtke; José R. Gregório

New chiral molecules were prepared with good yields starting from (R)-limonene, a cheap and abundant substrate.

http://dx.doi.org/10.21577/0103-5053.20190201

Published online: August 23, 2019.
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J. Braz. Chem. Soc. 2019

Chemically Reduced Graphene Oxide on Gold Electrodes from Recordable CDs: Characterization and Potential Sensing Applications

Francisco D. da Silva; Diego P. Rocha; Murilo N. T. Silva; Edson Nossol; Rodrigo A. A. Muñoz ; Felipe S. Semaan; Rafael M. Dornellas

Chemically reduced graphene oxide on Au gold electrodes obtained from recordable CDs as a novel, low-cost and sensitive sensing platform.

http://dx.doi.org/10.21577/0103-5053.20190200

Published online: August 21, 2019.
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Online version ISSN 1678-4790 Printed version ISSN 0103-5053
Journal of the Brazilian Chemical Society
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