16:46, Sat Dec 15

Open Access/APCs

Forthcoming Papers - 2018

Articles published online ahead of print

Short Report J. Braz. Chem. Soc. 2018

Flavonol Tri-O-glycoside and Other Chemical Constituents from Flowers of Aristolochia trulliformis

Juliana C. Holzbach; Walter A. Soares Filho; Camila L. Cunha; Isabele R. Nascimento

A new flavonol triglycoside was isolated from Aristolochia trulliformis flowers together with 15 known compounds.


Published online: December 14, 2018.

J. Braz. Chem. Soc. 2018

One-Pot Synthesis of NEMP, a VX Surrogate, and Reactivation of NEMP-Inhibited Electrophorus Eel Acetylcholinesterase by Current Antidotes

Samir F. A. Cavalcante ; Daniel A. S. Kitagawa; Rafael B. Rodrigues; Taynara C. Silva; Leandro B. Bernardo; Ana Beatriz A. Correa; Alessandro B. C. Simas

The structural similarity between venomous agent X (VX) and O-(4-nitrophenyl) O-ethyl methylphosphonate (NEMP) makes the latter a valuable tool for research on novel acetylcholinesterase reactivators.


Published online: December 14, 2018.

Articles J. Braz. Chem. Soc. 2018

Fluorescent Sensors Based on Cu-Doped Carbon Quantum Dots for the Detection of Rutin

Cheng-ya Wang; Shanzhai Shang; Xudong Zheng; Ping Lei; Jingmei Han; Linda Yuan; Zhiqiang Li; Ru Wang; Weimin Gong; Jianguo Tang; Yaling Yang

Schematic illustration of the sensitive fluorescence detection of rutin (RT) based on Cu-doped carbon quantum dots (Cu-CQDs).


Published online: December 14, 2018.

J. Braz. Chem. Soc. 2018

Application of LC-DAD Metabolic Fingerprinting in Combination with PCA for Evaluation of Seasonality and Extraction Method on the Chemical Composition of Accessions from Lippia alba (Mill.) N. E. Brown and Biological Activities

Raphael A. de Jesus; Vilma M. J. Prado; Vanderson S. Pinto; Valdenizia R. Silva; Luciano S. Santos; Paulo C. L. Nogueira; Sandro Navickiene; Edenir R. Pereira‑Filho ; Arie F. Blank; Daniel P. Bezerra ; Milena B. P. Soares; Claudia Seidl; Carmen L. Cardoso; Valéria R. S. Moraes

Fingerprinting chromatograms from Lippia alba (Mill.) N. E. Brown extracts and PC1 vs. PC2 scores graph.


Published online: December 13, 2018.

Short Report J. Braz. Chem. Soc. 2018

A Fast, Low-Cost, and Environmental Friendly Micro-Flow-Batch Analyzer for Photometric Determination of Sulfites in Beverages

Márcio R. S. Tavares; Stéfani I. E. Andrade ; Marcelo B. Lima; Inakã S. Barreto; Mário C. U. de Araújo; Luciano F. Almeida

A micro-flow-batch analyzer for sulfite determination in wines, whiskies, vodkas and beers.


Published online: December 13, 2018.

Articles J. Braz. Chem. Soc. 2018

Influence of Seasonality and Sunlight Effects on Rollinia mucosa Leaves Fingerprint

Sabrina Afonso; Fabiano B. Silva; Gustavo G. Marcheafave; Pedro H. Hatumura; Roy E. Bruns; Ieda S. Scarminio

Fingerprinting analytical techniques associated with chemometric analysis and mixture design enabled the chemical discrimination of the sun-exposed and self-shaded leaves of Rollinia mucosa in each of the four seasons.


Published online: December 13, 2018.

J. Braz. Chem. Soc. 2018

Facial Selectivity between Carbohydrates and Aromatic Amino Acids Explained by a Combination of NCI, NBO and EDA Techniques with NMR Spectroscopy

Thiago C. Rozada ; Ulisses Z. de Melo ; Rodrigo M. Pontes; Roberto Rittner; Ernani A. Basso

Analysis of the intermolecular interactions between carbohydrates and aromatic amino acids through 1H nuclear magnetic resonance (NMR) and density functional theory (DFT) calculations, employing non-covalent interactions (NCI), natural bond orbital (NBO), and energy decomposition analyses (EDA) methodologies, showed the importance of the dispersion component of the intermolecular interaction for the recognition of carbohydrates by aromatic amino acids and the electrostatic component for the differentiation between the faces of the monosaccharide.


Published online: December 11, 2018.

Short Report J. Braz. Chem. Soc. 2018

A Novel Thermal Infrared Enthalpimetric Method for Fast, High-Throughput Determination of the Content Uniformity of Captopril Tablets

Flavia M. Dalla Nora; Alessandra S. Oliveira; Bruna N. Lucas; Daniele F. Ferreira; Fabio A. Duarte; Adilson B. Costa; Fabiana E. B. Silva; Juliano S. Barin

Captopril tablets were dissolved in the wells of a microplate. The reaction between captopril and iodine solutions releases heat and the temperature of solutions rise. Infrared thermal imaging was used for simultaneous temperature monitoring of several wells and the temperature increase was directly related to the amount of captopril.


Published online: December 11, 2018.

Review J. Braz. Chem. Soc. 2018

RM1 Semiempirical Model: Chemistry, Pharmaceutical Research, Molecular Biology and Materials Science

Nathalia B. D. Lima ; Gerd B. Rocha; Ricardo O. Freire; Alfredo M. Simas

This review on the RM1 model presents improvements to the methodology as well as a wide range of its applications to theoretical, organic, physical, analytical, and inorganic chemistry, along with their interfaces with medicine, biology, and materials science.


Published online: December 10, 2018.

Articles J. Braz. Chem. Soc. 2018

Identificaton of the Alarm and Sex Pheromones of the Leaf-Footed Bug, Leptoglossus zonatus (Heteroptera: Coreidae)

Katia M. Inoue; Diogo M. Vidal; Emir B. Saad; Camila B. C. Martins; Paulo H. G. Zarbin

Sex and alarm pheromones emitted by Leptoglossus zonatus adults and nymphs.


Published online: December 10, 2018.

J. Braz. Chem. Soc. 2018

Seasonal and Circadian Study of a Thymol/γ-Terpinene/p-Cymene Type Oil of Ocimum gratissimum L. and its Antioxidant and Antifungal Effects

Joaquim A. M. de Castro ; Odair S. Monteiro; Denise F. Coutinho; Antonia A. C. Rodrigues; Joyce K. R. da Silva; José G. S. Maia

Ocimum gratissimum oil showed significant variation in its thymol/γ-terpinene/p-cymene chemotype during the seasonal and circadian studies. Probable synergistic action of these constituents contributes to the antioxidant and antifungal potential of the plant.


Published online: December 5, 2018.

J. Braz. Chem. Soc. 2018

Phosphate Adsorption by Montmorillonites Modified with Lanthanum/Iron and a Laboratory Test using Water from the Jacarepaguá Lagoon (RJ, Brazil)

Laís F. de Castro ; Vitor S. Brandão; Luiz C. Bertolino; Weber F. L. de Souza; Viviane G. Teixeira

Montmorillonites were modified with La/Fe as potential phosphate adsorbents for eutrophic aquatic environments. Material characterization data were correlated with the study of kinetics and adsorption equilibrium, and applied to a test in the laboratory using water from the Jacarepaguá Lagoon.


Published online: December 5, 2018.

J. Braz. Chem. Soc. 2018

Using a Multivariate Approach to Compare Lipid Extraction Protocols from Microalgae Scenedesmus sp.

Daiane F. Dall'Oglio; Laísse C. de Sousa; Samuel A. A. de Sousa; Marco A. S. Garcia; Edymilaís S. Sousa; Sidney G. de Lima; Pelrry S. Costa; Abhishek Guldhe; Faizal Bux; Edmilson M. de Moura; Carla V. R. de Moura

We have proposed a multivariate approach for lipid extraction from microalgae Scenedesmus sp. A reduction in the number of experiments was achieved and proved to be effective.


Published online: December 3, 2018.

J. Braz. Chem. Soc. 2018

Ten Years-Snapshot of the Occurrence of Emerging Contaminants in Drinking, Surface and Ground Waters and Wastewaters from São Paulo State, Brazil

Cassiana C. Montagner ; Fernando F. Sodré ; Raphael D. Acayaba ; Cristiane Vidal ; Iolana Campestrini; Marco A. Locatelli; Igor C. Pescara; Anjaína F. Albuquerque ; Gisela A. Umbuzeiro; Wilson F. Jardim

Occurrence of emerging contaminants in sewage, surface and ground waters and drinking water in the state of São Paulo.


Published online: November 27, 2018.

J. Braz. Chem. Soc. 2018

Mixed Ternary Mononuclear Copper(II) Complexes Based on Valproic Acid with 1,10-Phenanthroline and 2,2'-Bipyridine Ligands: DNA Interaction and Cytotoxicity in V79 Cells

Claus T. Pich ; Paulo R. dos Santos; Tatiana V. O. Fortunato; Marilda Chiarello; Iuri M. de Oliveira; Bárbara Q. Soares; Nour E. Ghermani; Miriana Machado; Mariana Roesch-Ely; Françoise Dumas ; Hernan Terenzi; João A. P. Henriques ; Sidnei Moura

Use of copper(II) complexes based on valproic acid as a genotoxic agents: an approach for the development of a new class of anticancer molecules.


Published online: November 22, 2018.

J. Braz. Chem. Soc. 2018

Metal Contents and Pb Isotopes in the Surface Seawater of the Gulf of Prigi, Indonesia: Detection of Anthropogenic and Natural Sources

Anugrah Ricky Wijaya ; Bambang Semedi; Retno Ariadi Lusiana; Alrum Armid; Muntholib Muntholib

The level of metal contents of Ca, Fe, Mn, Cu, Pb and 207Pb / 206Pb vs. 208Pb / 206Pb in the Gulf of Prigi reflected by natural sources such as mineral sources from marine sediment.


Published online: November 22, 2018.

J. Braz. Chem. Soc. 2018

Inorganic and Organic Acids in the Atmosphere of the Urban Area of the City of Salvador, Brazil

Lícia P. S. Cruz ; Elisvan R. Mota; Vânia P. Campos; Franciele O. Santana; Sâmeque R. Luz; Daniela F. Santos

Organic and inorganic acids were measured in the air of Salvador City and correlations were identified between these acids, criteria air pollutants and meteorological parameters.


Published online: November 22, 2018.

J. Braz. Chem. Soc. 2018

The Role of L-Proline and Co-Catalysts in the Enantioselectivity of OXA‑Michael‑Henry Reactions

Lucas F. do Carmo; Simone C. Silva; Matheus V. Machado; Paloma S. Prata ; Alberto Wisniewski Júnior; Diogo M. Vidal; José Augusto F. P. Villar

In this work, it was carried out a study of the OXA-Michael-Henry reactions between salicylaldehyde and β-nitrostyrenes, catalyzed by L-proline. The corresponding (R)-3-nitro-2-phenyl-2H-chromenes were obtained in 25-55% enantiomeric excess (ee) (20 mol% L-proline) and 50-70% ee (stoichiometric amount) employing Ti(OiPr)4 as Lewis acid.


Published online: November 16, 2018.

J. Braz. Chem. Soc. 2018

Zinc Ferrite Nanoparticles via Coprecipitation Modified Method: Glycerol as Structure Directing and Stabilizing Agent

Edilan S. Lima; Luelc S. Costa; Gabrielle R. L. M. Sampaio; Edipo S. Oliveira; Erandir B. Silva; Hélio O. Nascimento; Ronaldo F. Nascimento ; Karine O. Moura; Moisés Bastos-Neto; Adonay R. Loiola ; José M. Sasaki

Glycerol proved to be efficient towards the synthesis of well crystalline zinc ferrite nanoparticles, with highlighted characteristics.


Published online: November 13, 2018.

J. Braz. Chem. Soc. 2018

Application of a Novel Ion-Imprinted Polymer to the Separation of Traces of CdII Ions in Natural Water: Optimization by Box-Behnken Design

Caio S. A. Felix; Jeferson A. Barreto; Cleber G. Novaes ; Fábio A. C. Amorim; Valfredo A. Lemos; Heloysa M. C. Andrade; Erik G. P. da Silva

A novel method for selective extraction of cadmium ions in water samples was performed using ion-imprinted polymer. Box-Behnken design was used in the optimization of the principal variables of pre-concentration.


Published online: November 13, 2018.

J. Braz. Chem. Soc. 2018

Investigation on Ruthenium(II) Bipyridine/AgIII Complexes Chemiluminescence System and Its Application for Sensitive Norfloxacin and Ofloxacin Detection

Jinjin Liu; Ling Ma; Tangjuan Zhao; Kaijie Yang; Hongmei Shi; Weijun Kang; Li Ma

A novel and sensitive flow-injection chemiluminescence (FI-CL) method was developed for the detection of norfloxacin (NFLX) and ofloxacin (OFLX) in commercial drug, milk and human urine samples based on AgIII-ruthenium(II) bipyridine in acidic solution.


Published online: November 9, 2018.

J. Braz. Chem. Soc. 2018

Study on Experimental Leishmanicidal Activity and in silico of Cytochalasin B

André O. Feitosa; Fábio J. N. Ferreira ; Heliton P. C. Brigido; Mirian L. C. Bastos; Josiwander M. Carvalho; Agnaldo S. Carneiro; Maria F. Dolabela; Patrícia S. B. Marinho; Andrey M. R. Marinho

It was observed the stability of cytochalasin B in the site of the protein trypanothione reductase (TryR) by computational study. TryR is an important target in the study of leishmanicidal activity, since its inactivation can kill or stop the growth of the protozoan.


Published online: November 9, 2018.

J. Braz. Chem. Soc. 2018

A Novel Colorimetric Immunoassay of Ultrasensitive Alpha-Fetoprotein Sensing in Magnetic Bead-Based Mimic Enzyme-Chromogenic Substrate System

Dan Su; Qiang Zeng; Bingwei Feng; Pengfei Xu; Baixi Shan; Yonggui Song

Top figure shows the H2O2-stimulated colorimetric assay for monitoring of glucose oxidase (GOx) activity and the bottom figure displays the mimic enzyme-chromogenic substrate-based colorimetric immunoassay (MECI) by coupling with the hemin/4-aminoatipyrine/phenol system.


Published online: November 8, 2018.

J. Braz. Chem. Soc. 2018

Comparative Study on Catalytic Dehydration of Glycerol with Alcohols

Guangxin Jia ; Wenlin Ma; Beibei He; Yifan Sun; Laishuan Liu

A comparative study of the dehydration of glycerol with alcohols over ion exchange resin Amberlyst-35 was performed. The effect of catalyst amounts, reaction temperature, time, and the molar ratio of alcohols to glycerol were also studied.


Published online: November 7, 2018.

J. Braz. Chem. Soc. 2018

New Composites CP@AC Based on Lanthanide Succinates

Guilherme C. Santos; Carlos A. F. de Oliveira; Fausthon F. da Silva ; Severino Alves Jr.

This work explores the synthesis and characterization of seven new composites based on lanthanide-succinates coordination polymers and activated carbon.


Published online: November 6, 2018.

J. Braz. Chem. Soc. 2018

Development and Validation of UHPLC-MS/MS for Simultaneous Determination of Scutellarin and Salicylic Acid in Rat Plasma: Application to Herb-Drug Pharmacokinetic Interaction Study

Guoliang Dai ; Jiandong Chen; Weidong Zhang; Yongtao Bai; Wen Jing; Ronghua Pan; Wenzheng Ju

This work showed that apparent herb-drug pharmacokinetic interaction existed between aspirin and dengzhanxixin injection, and the combination of aspirin and dengzhanxixin injection noticeably altered the absorption, distribution and disposition of salicylic acid.


Published online: November 6, 2018.

J. Braz. Chem. Soc. 2018

Integrative Analysis Based on HPLC-DAD-MS/MS and NMR of Bertholletia excelsa Bark Biomass Residues: Determination of Ellagic Acid Derivatives

Felipe M. A. da Silva ; Anna Carolina S. Hanna; Abraão A. de Souza; Francinaldo A. da Silva Filho; Olinda M. F. Canhoto; Alvicler Magalhães; Paulo J. C. Benevides; Mariangela B. M. de Azevedo; Antonio C. Siani; Adrian M. Pohlit; Afonso D. L. de Souza; Hector H. F. Koolen

The combination of nuclear magnetic resonance (NMR) and mass spectrometry (MS) to directly analyze crude extracts of Bertholletia excelsa bark residues indicated this biomass as a source of health-promoting compounds. Therefore, a potential raw material for food, pharmaceutical and chemical industries is described herein.


Published online: November 1, 2018.

J. Braz. Chem. Soc. 2018

Optimization of Atmospheric Pressure Photoionization for the Crude Oil Analysis Using Ultra-High Resolution Mass Spectrometry

Jandyson M. Santos ; Marcos A. Pudenzi; Alberto Wisniewski Jr.; Márcia C. Breitkreitz; Marcos N. Eberlin

Design of experiments was successfully applied to optimize atmospheric pressure photoionization (APPI)(±) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) parameters for crude oil and its saturate, aromatic, resin and asphaltene (SARA) fractions analyses.


Published online: October 31, 2018.

J. Braz. Chem. Soc. 2018

Photochemical Synthesis of Gold Nanoparticles by Irradiation of Gold Chloride with the 2nd Harmonic of a Nd:YAG Laser

Henrique F. P. Barbosa; Miguel G. Neumann; Carla C. S. Cavalheiro

Irradiation of a HAuCl4 solution with the 532-nm emission of a pulsated Nd-YAG laser results in the production of pristine gold nanoparticles.


Published online: October 26, 2018.

J. Braz. Chem. Soc. 2018

New Approach for the Stereoselective Synthesis of (+)-epi-Cytoxazone

Izabel L. Miranda; Suélen K. Sartori; Marisa A. N. Diaz; Gaspar Diaz-Muñoz

The stereoselective total synthesis of (+)-epi-cytoxazone was performed satisfactorily in 8 steps, in 17% overall yield, via a novel route from 2,3-O-(3-pentylidene)-(R)-glyceraldehyde. The bulky group alkene-ketal allowed intramolecular control of the target molecule's asymmetric centers in the dihydroxylation step.


Published online: October 25, 2018.

J. Braz. Chem. Soc. 2018

Combination of Multi-Energy Calibration (MEC) and Laser-Induced Breakdown Spectroscopy (LIBS) for Dietary Supplements Analysis and Determination of Ca, Mg and K

Amanda S. Augusto; Jeyne P. Castro; Marco A. Sperança; Edenir R. Pereira‑Filho

Ablation process by laser-induced breakdown spectroscopy (LIBS) on dietary supplement surface and multi-energy calibration method (MEC).


Published online: October 22, 2018.

J. Braz. Chem. Soc. 2018

Zika Virus Activity of the Leaf and Branch Extracts of Tontelea micrantha and Its Hexane Extracts Phytochemical Study

Fernanda L. Ferreira; Marcela S. Hauck; Lucienir P. Duarte; José C. de Magalhães; Louise S. M. da Silva; Lúcia P. S. Pimenta; Julio C. D. Lopes; Maria O. Mercadante‑Simões; Sidney A. Vieira Filho

The new friedelan-1,3,21-trione, nine known friedelanes, gutta-percha, squalene and a mixture of long-chain fatty acids were reported for the first time from Tontelea micrantha and also its genus. Its extracts inhibited Zika virus (ZIKV) multiplication at different stages, presenting a high virucidal effect.


Published online: October 18, 2018.

J. Braz. Chem. Soc. 2018

Black Carbon Associated to PM1.0 and PM2.5: Mass Variation due to Combustion of Biodiesel/Diesel Blends (B5, B6, B7 and B8)

Carlos R. da Silva Junior; Bruno R. L. Lemos; Jurandir P. Pinto; Ismael R. Amador; Maria Cristina Solci

Before and after fine particulate matter on filter samples inside a bus station.


Published online: October 17, 2018.

Short Report J. Braz. Chem. Soc. 2018

Gene Deletion Leads to Improved Valinomycin Production by Streptomyces sp. CBMAI 2042

Bruno S. Paulo; Renata Sigrist; Célio F. A. Angolini; Marcos N. Eberlin; Luciana G. de Oliveira

A non-ribosomal peptide synthetase (NRPS) gene knockout experiment resulted in 10.5-fold valinomycin overproduction. These results reveal a modification on substrate efflux of competing biosynthetic recruiters.


Published online: October 15, 2018.

Articles J. Braz. Chem. Soc. 2018

Use of FTIR-ATR Spectroscopy Combined with Multivariate Analysis as a Screening Tool to Identify Adulterants in Raw Milk

Daniele G. Conceição; Ben-Hur R. F. Gonçalves; Fernanda F. da Hora; Amanda S. Faleiro; Leandro S. Santos; Sibelli P. B. Ferrão

Study of the use of Fourier transform infrared spectroscopy combined with multivariate analysis to identify adulterations in raw milk and in samples from producers.


Published online: October 15, 2018.

J. Braz. Chem. Soc. 2018

Reduction Potential of RuIII-Based Complexes with Potential Antitumor Activity and Thermodynamics of their Hydrolysis Reactions and Interactions with Possible Biological Targets: a Theoretical Investigation

Eufrásia S. Pereira; Marcelo A. Chagas; Willian R. Rocha

Density functional theory (DFT) calculations were performed to investigate competitive process in solution involving the anticancer trans-tetrachloro(dimethylsulfoxide)imidazole ruthenate(III) (NAMI-A) and trans-[tetrachlorobis(1H-indazole)ruthenate(III)] (KP1019) complexes.


Published online: October 11, 2018.

J. Braz. Chem. Soc. 2018

Deracemization of sec-Alcohols through Sequential Application of C. albicans and Ketoreductases

Fábio D. Nasário; Paulo J. S. Moran; José Augusto R. Rodrigues

A biocatalytic cascade process was developed using the yeast Candida albicans CCT 0776 and a commercially available ketoreductase to promote deracemization of (±)-1-arylethanols, in high substrate concentration (above 100 mmol L-1), to prepare the (R)-alcohols (90-99%), with a high enantiomeric excess (83-99%) after 2-19 h.


Published online: October 11, 2018.

J. Braz. Chem. Soc. 2018

Methyl Esters Production by Heterogeneous Catalyst Mixtures of CaO/Nb2O5 with Simulation of Analysis of Environmental Impacts

Diana C. Cubides-Román; André F. Constantino; Geraldo F. David; Lucas F. Martins; Reginaldo B. dos Santos; Wanderson Romão; Alvaro Cunha Neto; Valdemar Lacerda Jr.

Biodiesel production catalyzed by a mixture of CaO and Nb2O5, statistical analysis and simplified process simulation to study environmental impacts.


Published online: October 10, 2018.

J. Braz. Chem. Soc. 2018

Synthesis of Nerol Derivatives Containing a 1,2,3-Triazole Moiety and Evaluation of Their Activities against Cancer Cell Lines

Róbson R. Teixeira; Adalberto M. da Silva; Raoni P. Siqueira; Victor Hugo S. Gonçalves; Higor S. Pereira; Rafaela S. Ferreira; Adilson V. Costa; Eduardo B. de Melo; Fávero R. Paula; Márcia M. C. Ferreira; Gustavo C. Bressan

Twenty two triazolic derivatives were synthesized and had their cytotoxicity evaluated. 3D quantitative structure-activity relationship (QSAR) models were built for a better understanding of the biological activity results.


Published online: October 10, 2018.

J. Braz. Chem. Soc. 2018

Studies Toward the Synthesis of Caramboxin Analogues

Ronaldo E. Oliveira Filho; Vanessa M. Higa; Álvaro T. Omori

The Vilsmeier-Haack formylation of aromatic compounds is the key step in the synthesis of caramboxin analogues.


Published online: October 9, 2018.

J. Braz. Chem. Soc. 2018

Assessment of Novel C-4 Methylated Tetraketide by HPLC-SPE-TT in Saccharicola sp., an Endophytic Fungus in Eugenia jambolana Lam.

Maiara S. Borges; Carolina R. Biasetto; Vanessa M. Chapla; Samad N. Ebrahimi; Mayra F. Costa; Vanderlan S. Bolzani; Angela R. Araujo

A new compound methyl (6S,7S,2E,4E)-6,7-dihydroxy-4,6-dimethyl octanoate and four known compounds isolated from Saccharicola sp.


Published online: October 9, 2018.

J. Braz. Chem. Soc. 2018

Dispersive Solid Phase Extraction Headspace Sampling in Gas Chromatography-Mass Spectrometric Analysis of Volatiles: Application to Separation of Polycyclic Aromatic Hydrocarbons

Zahra Ramezani; Fatemeh Kardani; Nadereh Rahbar; Ahmad Babapoor; Fariba Bahrami

Dispersive solid phase extraction combined with headspace sampling was introduced and applied to separation and pre-concentration of polycyclic aromatic hydrocarbons (PAHs).


Published online: October 8, 2018.

J. Braz. Chem. Soc. 2018

Insights on Structuration of Peroxotungstic Acid in Aqueous Media

Julia C. O. Pazinato; Marcos A. Villetti; Omar Mertins; Emerson R. Silva; Irene T. S. Garcia

The intensity of pyrene fluorescence bands increases with increasing sodium dodecyl sulfate (SDS) concentration, overriding the suppressive effect of peroxotungstic acid (PTA). The image at left shows small angle X-ray scattering curve for PTA/NaCl/SDS/ethanol/water and the resulting fractal structured films.


Published online: October 2, 2018.

J. Braz. Chem. Soc. 2018

Cr3+ Doped Al2O3 Obtained by Non-Hydrolytic Sol-Gel Methodology

José M. A. Caiut; Nolwen Floch; Younès Messaddeq; Omar J. de Lima; Lucas A. Rocha; Katia J. Ciuffi; Eduardo J. Nassar; Geraldo R. Friedermann; Sidney J. L. Ribeiro

The non-hydrolytic sol-gel route is a single methodology to obtain different host for applications as light emission. The ruby and other semi-precious stones can be obtained by sol-gel methodology. The luminescence spectra indicated the octahedral symmetry of the chromium(III) ion replacing aluminum(III) ion in the alumina matrix.


Published online: October 2, 2018.

J. Braz. Chem. Soc. 2018

Human Hair as Adsorbent of Palladium(II) in Solution: A Precursor of Well-Dispersed Size-Controlled Pd Nanoparticles

Fernanda G. Mendonça; Thaís G. Silva; Gustavo M. do Nascimento; Humberto O. Stumpf; Raquel V. Mambrini; Walace D. do Pim

Human hair was used as an efficient adsorbent for palladium(II) in solution and, after a mild thermal treatment, well-dispersed Pd nanoparticles were obtained.


Published online: October 1, 2018.

J. Braz. Chem. Soc. 2018

Water-Soluble Benzazole Dyes Fluorescent by ESIPT: Structural Characterization, Photophysical Properties and Its Application as a Probe for Direct Staining of Helminths

Hélio L. Barros; Sandra M. T. Marques; Valter Stefani

Photophysical properties of water-soluble benzazole dyes fluorescent by excited state intramolecular proton transfer mechanism (ESIPT) and their applications in cell imaging.


Published online: September 28, 2018.

J. Braz. Chem. Soc. 2018

New Synthesis Method for a Core-Shell Composite Based on α-Bi2O3@PPy and its Electrochemical Behavior as Supercapacitor Electrode

Fárlon F. S. Xavier; Carlos G. O. Bruziquesi; Wélique S. Fagundes; Elaine Y. Matsubara; José M. Rosolen; Adilson C. Silva; Sheila C. Canobre; Fábio A. Amaral

New α-Bi2O3@PPy core-shell hybrid composite based on polypyrrole (PPy) electropolymerized with ordered α-Bi2O3, which intensified the electrochemical properties, making it promising for supercapacitor application.


Published online: September 27, 2018.

J. Braz. Chem. Soc. 2018

Carbon in Physical Fractions and Organic Matter Chemical Composition of an Acrisol after Amazon Forest Burning and Conversion into Pasture

Otávio A. Leal; Deborah P. Dick; Falberni S. Costa; Heike Knicker; João A. de Carvalho Júnior; José C. Santos

Soil carbon stocks and organic matter composition (assessed by 13C NMR spectroscopy) in an Acrisol under native Amazon Forest and natural regeneration or pasture cultivation after native Amazon Forest slash-and-burn, which emitted 74 Mg ha-1 of carbon to the atmosphere.


Published online: September 26, 2018.

J. Braz. Chem. Soc. 2018

New Antiproliferative Polyunsaturated Epoxy-Heneicosane Derivatives Isolated from the Brown Alga Lobophora variegata

Fábio N. Ávila; Francisco C. L. Pinto; Pedro B. M. Carneiro; Kayanny Q. Ferreira; Diego V. Wilke; Nádia A. P. Nogueira; Edilberto R. Silveira; Otília Deusdênia L. Pessoa

Two new polyunsaturated 3,4-epoxy-heneicosane derivatives named as epoxy-lobophorene A and B were isolated from the brown alga Lobophora variegata and presented a moderate antiproliferative effect against tumor cell lines.


Published online: September 24, 2018.

J. Braz. Chem. Soc. 2018

Green Chemistry Method Based on PARAFAC EEM Data Modeling for Benzo[a]pyrene Quantitation in Distilled Spirit

Amanda C. Silva; Licarion Pinto; Adriano A. Gomes; Mario C. U. Araujo

Procedure of benzo[a]pyrene (BaP) quantification in cachaças using PARAFAC to overcome the interferences.


Published online: September 24, 2018.

J. Braz. Chem. Soc. 2018

Floral Scent and Nectar Sugar Composition of Temnadenia odorifera (Apocynoideae, Apocynaceae)

Rafael F. Silva; Natália A. B. Tinoco; Anna Tsukui; Cristiana Koschnitzke; Inara C. Silva-Batista; Claudia M. Rezende; Humberto R. Bizzo

Analysis of the chemical composition of the attractants and floral resources available in T. odorifera provided a broader understanding of the mechanisms responsible for plant-insect interactions.


Published online: September 24, 2018.

J. Braz. Chem. Soc. 2018

Evaluation of the Influence of Extraction Conditions on the Isolation and Identification of Volatile Compounds from Cagaita (Eugenia dysenterica) Using HS-SPME/GC-MS

Mauro R. Silva; Gustavo H. Bueno; Raquel L. B. Araújo; Inayara C. A. Lacerda; Lucas G. Freitas; Harriman A. Morais; Rodinei Augusti; Júlio O. F. Melo

Conditions optimization of extraction of volatile compounds from fruit of Eugenia dysenterica using different solid-phase microextraction (SPME) fibers.


Published online: September 21, 2018.

J. Braz. Chem. Soc. 2018

Recombination Study of Dye Sensitized Solar Cells with Natural Extracts

Gideã T. Tractz; Aline Viomar; Bianca V. Dias; Camila A. de Lima; Everson P. Banczek; Maico T. da Cunha; Sandra R. M. Antunes; Paulo R. P. Rodrigues

In this study, frequency domain techniques are used to examine electron transport and dye recombination in natural dye sensitized solar cells.


Published online: September 21, 2018.

J. Braz. Chem. Soc. 2018

Catalytic Cracking of Soybean Oil for Biofuel over γ-Al2O3/CaO Composite Catalyst

Zhi Zheng; Tong Lei; Jun Wang; Yi Wei; Xuejun Liu; Fengwen Yu; Jianbing Ji

Catalytic cracking of soybean oil for biofuel over γ-Al2O3/CaO composite catalysts was conducted in a fixed-bed reactor. The biofuel showed similar chemical composition and fuel properties (low acid value and high calorific value) with the petroleum-based fuel due to the acid-base characters of γ-Al2O3/CaO composite catalysts.


Published online: September 21, 2018.

J. Braz. Chem. Soc. 2018

Fast Triacylglycerol Screening and Semi-Quantitative Analysis of Fatty Acids in Commercial Oils by DIMS with 18-Crown-6 Ether/Trifluoracetic Acid Dopants

Angelica P. P. Tonin; Marcos A. S. Ribeiro; Camila B. Poliseli; Roberta da Silveira; Jesuí V. Visentainer; Valquíria M. Silva; Leomara F. Ribeiro; Rodrigo C. T. de Souza; Cláudio C. de Oliveira; Eduardo C. Meurer

Simple and rapid analysis of commercial oils by direct injection electrospray ionization mass spectrometry (DIMS) and identification of adulteration in olive oil.


Published online: September 20, 2018.

J. Braz. Chem. Soc. 2018

Biodiesel Synthesis: Influence of Alkaline Catalysts in Methanol-Oil Dispersion

José G. Rocha Jr.; Andreza D. M. Mendonça; Daniel A. R. de Campos; Renilson O. Mapele; Cristina M. Barra; Glauco F. Bauerfeldt; Matthieu Tubino

Methyl esters and alkaline catalysts are adsorbed on the surface of the methanol oil, favoring the dispersion of the methanol in the oil phase. The adsorption of potassium is greater than that of sodium.


Published online: September 18, 2018.

J. Braz. Chem. Soc. 2018

Antimicrobial Potential of Natural and Semi-Synthetic ent-Kaurane and ent-Pimarane Diterpenes against Clinically Isolated Gram-Positive Multidrug-Resistant Bacteria

Ana Carolina F. Soares; Priscilla M. Matos; Karime F. da Silva; Carlos H. G. Martins; Rodrigo C. S. Veneziani; Sérgio R. Ambrósio; Herbert J. Dias; Raquel A. dos Santos; Vladimir C. G. Heleno

Two natural diterpenes were evaluated against multi-drug resistant (MDR) Gram-positive bacteria and were converted into 28 semi-synthetic derivatives. Both natural compounds displayed interesting activity overall, but not so good against Staphylococcus aureus, a relevant multi-resistant pathogen. The activities of all derivatives were determined what revealed one with good overall activity and with a noteworthy activity against S. aureus. All other results could further clarify some structure-antimicrobial activity relationship questions about diterpenes.


Published online: September 18, 2018.

J. Braz. Chem. Soc. 2018

Potential Slow Release Fertilizers and Acid Soil Conditioners Obtained by One-Pot Mechanochemical Activation of Chrysotile:Cement Roofing Sheets with K2HPO4

Roger Borges; Fernando Wypych

Chrysotile:cement sheets were milled with K2HPO4 and the amorphous mixture, free of fibers, presents a potential fertilizer and soil conditioner behavior.


Published online: September 17, 2018.

J. Braz. Chem. Soc. 2018

Fast Determination of Iodine Number of Biodiesel Using Capillary Zone Electrophoresis with Multi- and Single-Point Calibration

Alysson V. F. Sako; Gustavo A. Micke

Strategy for fast determination of iodine number of biodiesel samples by capillary zone electrophoresis (CZE). Low sample amount (mg), reactant (µL), and organic solvent (µL) are required.


Published online: September 17, 2018.

J. Braz. Chem. Soc. 2018

Controlled Dehydration of Fe(OH)3 to Fe2O3: Developing Mesopores with Complexing Iron Species for the Adsorption of β-Lactam Antibiotics

Paula S. Pinto; Giovani D. Lanza; José D. Ardisson; Rochel M. Lago

The evolution of the iron hydroxide to produce mesopores containing [FeOx(OH)y] surface sites capable of complexing the amoxicillin molecules.


Published online: September 13, 2018.

J. Braz. Chem. Soc. 2018

Influence of Electrooxidation of Ni Wire Electrodes on the Kinetics of Oxygen Evolution Reaction Studied in 0.1 mol dm-3 NaOH

Andrii Slis; Tomasz Mikolajczyk; Boguslaw Pierozynski

Oxygen evolution reaction (OER) on nickel wire with nickel oxyhydroxide layer.


Published online: September 13, 2018.

J. Braz. Chem. Soc. 2018

Antimicrobial, Anti-Inflammatory and Antioxidant Activities of Polyoxygenated Chalcones

Yesseny A. Vásquez-Martínez; Mauricio E. Osorio; Diego A. San Martín; Marcela A. Carvajal; Alejandra P. Vergara; Elizabeth Sanchez; Marcela Raimondi; Susana A. Zacchino; Carolina Mascayano; Claudia Torrent; Francisco Cabezas; Sophia Mejias; Margarita Montoya; Marcelo Cortez‑San Martín

Nine simple polyoxygenated chalcones were synthesized to evaluate their antimicrobial, anti-inflammatory and antioxidant activities.


Published online: September 13, 2018.

J. Braz. Chem. Soc. 2018

Maximal Information Coefficient and Support Vector Regression Based Nonlinear Feature Selection and QSAR Modeling on Toxicity of Alcohol Compounds to Tadpoles of Rana temporaria

Lifeng Wang; Pengwei Xing; Cong Wang; Xiaomao Zhou; Zhijun Dai; Lianyang Bai

Given a dataset, first, use maximum information coefficient (MIC-filter), support vector regression backward elimination (SVR-BE) and minimal redundancy maximal relevance (mRMR-MIC) to select features. Second, use the multiple linear regression (MLR), partial least square regression (PLS) and support vector regression (SVR) to build quantitative structure activity relationship (QSAR) models.


Published online: September 11, 2018.

J. Braz. Chem. Soc. 2018

2D, 3D and Hybrid QSAR Studies of Nostoclide Analogues as Inhibitors of the Photosystem II

Pedro O. M. de Carvalho; Márcia M. C. Ferreira

2D and 3D molecular descriptors were calculated, selected and used to build quantitative structure-activity relationship (QSAR) models to predict the herbicide activity of a set of nostoclide analogues (experimental data retrieved from the literature). The models were interpreted to understand the ligand-receptor interactions.


Published online: September 11, 2018.

J. Braz. Chem. Soc. 2018

Biomonitoring of Toxic Elements in Plants Collected Near Leather Tanning Industry

Alex R. H. De La Cruz; Lorreine D. S. C. Ferreira; Vinicius P. Andrade; Adriana Gioda

The leather industry has significant economic influence; however, it suffers from the negative impact due to environmental pollution caused by tannery wastes produced during leather processing.


Published online: September 4, 2018.

J. Braz. Chem. Soc. 2018

SPME Fiber Evaluation for Volatile Organic Compounds Extraction from Acerola

Yesenia M. García; José C. M. Rufini; Matheus P. Campos; Mayara N. S. Guedes; Rodinei Augusti; Júlio O. F. Melo

Extraction of volatile organic compounds from acerola fruits through the use of different solid phase microextraction (SPME) fibers.


Published online: September 4, 2018.

J. Braz. Chem. Soc. 2018

Physicochemical Characterizations and Antioxidant Property of Copaiba Oil Loaded into SNEDDS Systems

Denise P. Emerenciano; Bernardo B. D. Baracho; Melyssa L. de Medeiros; Hugo A. O. Rocha; Francisco H. Xavier Jr.; Valdir F. da Veiga Jr.; Maria Aparecida M. Maciel

Copaiba oil-resin loaded into self-nanoemulsion drug delivery systems (SNEDDS) were obtained in order to improve the solubility and bioavailability of this natural oil.


Published online: September 4, 2018.

J. Braz. Chem. Soc. 2018

High Uranium Concentrations in the Groundwater of the Rio de Janeiro State, Brazil, Mountainous Region

José M. Godoy; Paulo R. Ferreira; Elder M. de Souza; Larisse I. da Silva; Isabela C. S. Bittencourt; Felipe Fraifeld

Uranium concentrations higher than the Brazilian regulatory limits were observed in several groundwater wells in the mountainous region near Rio de Janeiro City. Clear water does not mean uncontaminated water.


Published online: September 3, 2018.

J. Braz. Chem. Soc. 2018

Encapsulating TiO2 into Polyvinyl Alcohol Coated Polyacrylonitrile Composite Beads for the Effective Removal of Methylene Blue

Zhenhua Han; Jiali Jin; Yuchao Wang; Zihui Zhang; Junjie Gu; Minrui Ou; Xiaoping Xu

Polyacrylonitrile (PAN)/polyvinyl alcohol (PVA)/TiO2 (PPT) beads structure and removal of methylene blue (MB) under visible light irradiation.


Published online: August 31, 2018.

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