JBCS

5:54, Fri May 24

Open Access/APCs

Current Issue vol. 30, No. 6, 2019, p. 1115-1340

 

Gold-based catalysts are appealing candidates to substitute stoichiometric reagents in oxidation reactions. The major hurdle in their wide application is related to separation issues, which can be solved via the magnetic recovery potential of the cobalt ferrite (CoFe2O4). Aldehydes or esters are starting materials necessary for the fine chemistry industry, which are obtained by alcohol oxidation. The performance of the proposed material is increased by metal-support interactions that use the properties of the Sr(OH)2 material and Au nanoparticles. Focusing on sustainable approaches, the studies herein presented were able to oxidize the benzyl alcohol with a good balance between activity and selectivity, with a catalyst that was used five times without performance loss. Details are presented in the Article Gold Supported on Strontium Surface-Enriched CoFe2O4 Nanoparticles: a Strategy for the Selective Oxidation of Benzyl Alcohol by Laise N. S. Pereira, Carlos E. S. Ribeiro, Aryane Tofanello, Jean C. S. Costa, Carla V. R. de Moura, Marco A. S. Garcia and Edmilson M. de Moura on page 1317.


Cover Article
J. Braz. Chem. Soc. 2019, 30(6), 1317-1325

Gold Supported on Strontium Surface-Enriched CoFe2O4 Nanoparticles: a Strategy for the Selective Oxidation of Benzyl Alcohol

Laise N. S. Pereira; Carlos E. S. Ribeiro; Aryane Tofanello; Jean C. S. Costa; Carla V. R. de Moura ; Marco A. S. Garcia; Edmilson M. de Moura

How to cite this article

Gold-based catalysts are appealing candidates to substitute stoichiometric reagents in oxidation reactions. The major hurdle in their wide application is related to separation issues, which can be solved via the magnetic recovery potential of the cobalt ferrite (CoFe2O4). Aldehydes or esters are starting materials necessary for the fine chemistry industry, which are obtained by alcohol oxidation. The performance of the proposed material is increased by metal-support interactions that use the properties of the Sr(OH)2 material and Au nanoparticles. Focusing on sustainable approaches, the studies herein presented were able to oxidize the benzyl alcohol with a good balance between activity and selectivity, with a catalyst that was used five times without performance loss. Details are presented in the Article Gold Supported on Strontium Surface-Enriched CoFe2O4 Nanoparticles: a Strategy for the Selective Oxidation of Benzyl Alcohol by Laise N. S. Pereira, Carlos E. S. Ribeiro, Aryane Tofanello, Jean C. S. Costa, Carla V. R. de Moura, Marco A. S. Garcia and Edmilson M. de Moura on page 1317.

http://dx.doi.org/10.21577/0103-5053.20190030

Published online: February 20, 2019

Review J. Braz. Chem. Soc. 2019, 30(6), 1115-1129

Perspectives and Applications of Natural Products as Civilian Defense Devices

Ananda S. Antonio ; Gabriel D. Fonseca; Álvaro J. B. Mendes; Larissa S. M. Wiedemann; Valdir F. Veiga-Junior

How to cite this article

 

Capsaicin, piperine, gingerol and other pungent natural compounds are technologically developed bioproducts for civilian's self-defense proposes.

http://dx.doi.org/10.21577/0103-5053.20190028

Published online: February 19, 2019

Articles J. Braz. Chem. Soc. 2019, 30(6), 1130-1137

Determination of L-Ascorbic Acid in Milk by Ultra-High-Performance Liquid Chromatography Coupled to Tandem Mass Spectrometry Analysis

Caroline D. Zappielo ; Antonio E. Nicácio; Luciana P. Manin; Liane Maldaner; Jesuí V. Visentainer

How to cite this article

 

This study presented the development of a fast and accurate method for determination of L-ascorbic acid (L-AA) in different milk samples (raw and processed). In the sample preparation, a low toxicity organic solvent was used in the degreasing and deproteinization step, avoiding L-AA oxidation.

http://dx.doi.org/10.21577/0103-5053.20190008

Published online: January 11, 2019

J. Braz. Chem. Soc. 2019, 30(6), 1138-1149

A Complete and Unambiguous 1H and 13C NMR Signals Assignment of para-Naphthoquinones, ortho- and para-Furanonaphthoquinones

Tatiane F. Borgati ; José D. de Souza Filho; Alaíde B. de Oliveira

How to cite this article

 

This is the first report distinguishing para-naphthoquinones, ortho- and para- furanonaphthoquinones by one and two-dimensional techniques of nuclear magnetic resonance (NMR).

http://dx.doi.org/10.21577/0103-5053.20190009

Published online: January 17, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1150-1160

Human Metabolism of the Anabolic Steroid Methasterone: Detection and Kinetic Excretion of New Phase I Urinary Metabolites and Investigation of Phase II Metabolism by GC-MS and UPLC-MS/MS

Wendell S. Magalhães ; Bruno C. Garrido; Gustavo A. Cavalcanti; Monica C. Padilha; Alessandro Casilli; Henrique M. G. Pereira; Francisco R. de Aquino Neto

How to cite this article

 

The phase I and II metabolism of methasterone, a designer anabolic steroid prohibited for athletes and monitored by anti-doping laboratories, were studied by chromatographic techniques using human urine samples. One new metabolite is shown: 17β-hydroxy-2α,17α-dimethyl-5β-androstan-3-one, obtained from the epimerization at C5

http://dx.doi.org/10.21577/0103-5053.20190010

Published online: January 22, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1161-1177

DFT Study of the Interaction between the Ni2+ and Zn2+ Metal Cations and the 1,2-Dithiolene Ligands: Electronic, Geometric and Energetic Analysis

Glauber S. Melengate; Daniel G. S. Quattrociocchi; José M. Siqueira Júnior ; Stanislav R. Stoyanov; Leonardo M. Costa; Glaucio B. Ferreira

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The affinity between the Zn2+ and Ni2+ metal cations and 1,2-dithiolene ligands was quantified from the substitution energies and rationalized through energetic, electronic and geometric parameters.

http://dx.doi.org/10.21577/0103-5053.20190011

Published online: January 23, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1178-1188

Ferulate Anion Intercalated into Zn/Al Layered Double Hydroxide: A Promising Intercalation Compound for Inhibition of Leishmania (L.) amazonensis

Robson Sousa; Bruno J. M. da Silva; Amarílis A. Dias; Carla C. F. Meneses; Beatriz A. Bentes; Edilene O. Silva; Cláudio M. R. Remédios; Waldeci P. Feio; Olivier Masson; Cláudio N. Alves; Mara M. S. P. Arruda; Jerônimo Lameira

How to cite this article

 

Synthesis, physicochemical characterization and leishmanicidal activity of the layered double hydroxide (LDH)-ferulate anion (FER-) intercalation compound, a potential drug delivery vehicle for potential treatment of cutaneous leishmaniasis without any side effect.

http://dx.doi.org/10.21577/0103-5053.20190012

Published online: January 24, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1189-1202

Streamlined Synthesis of 6-((1H-1,2,3-Triazol-4-yl)methyl)-1H-pyrrolo [3,4-d]pyridazin-1-one System via Sequential N-Alkylation, CuAAC, and [4 + 2] Cyclization Reactions

Helio G. Bonacorso ; Hernane T. Magalhães; Gean M. Dal Forno; Francieli M. Libero; Manfredo Hoerner; Clarissa P. Frizzo; Marcos A. P. Martins; Nilo Zanatta

How to cite this article

 

Useful synthesis of pyrrolo[3,4-d]pyridazin-1-ones by sequential N-alkylation, CuAAC and [4 + 2] cyclocondensation reactions.

http://dx.doi.org/10.21577/0103-5053.20190013

Published online: January 29, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1203-1210

A Deep Eutectic Solvent as an Extraction Solvent to Separate and Preconcentrate Parabens in Water Samples Using in situ Liquid-Liquid Microextraction

Dandan Ge ; Ying Wang; Qian Jiang; Enrui Dai

How to cite this article

 

In situ deep eutectic solvent liquid-liquid microextraction method was developed as a sample preparation method for the detection of parabens. The deep eutectic solvent, formed in situ by the DL-menthol and decanoic acid, was used as the microextraction solvent.

http://dx.doi.org/10.21577/0103-5053.20190014

Published online: January 30, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1211-1221

Assessment of a Fully Optimized DPX-Based Procedure for the Multiclass Determination of Pesticides in Drinking Water Using High-Performance Liquid Chromatography with Diode Array Detection

Gabriela Corazza; Josias Merib; Sângela N. do Carmo; Leila D. Mendes; Eduardo Carasek

How to cite this article

 

Disposable pipette extraction (DPX)-based procedure was fully optimized for determination of multiclass of pesticides in 20 drinking water samples by high-performance liquid chromatography coupled with diode array detection (HPLC-DAD).

http://dx.doi.org/10.21577/0103-5053.20190016

Published online: February 4, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1222-1228

Electrochemiluminescence Detection of Silver Ion Based on Trigeminal Structure of DNA

Zhejian Li ; Xuemei Fan; Baoyue Cao; Fei Yuan; Fengying Chen; Shumin Wang

How to cite this article

 

A novel electrochemiluminescence sensor for highly sensitive detection of Ag+ is developed based on the sensitive "turn-on" three-way junction of deoxyribonucleic acid (DNA).

http://dx.doi.org/10.21577/0103-5053.20190017

Published online: February 5, 2019

J. Braz. Chem. Soc. 2019, 30(6), 1229-1240

Determination of Phenolic Compounds in Red Sweet Pepper (Capsicum annuum L.) Using a Modified QuEChERS Method and UHPLC-MS/MS Analysis and Its Relation to Antioxidant Activity

Carina A. Rodrigues ; Antonio E. Nicácio; Isabel C. S. F. Jardim; Jesuí V. Visentainer; Liane Maldaner

How to cite this article

 

A fast, easy and efficient analytical method based on a modified quick, easy, cheap, effective, rugged and safe (QuEChERS) method and ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) analysis was developed and validated for the determination of phenolic compounds in red sweet pepper.

http://dx.doi.org/10.21577/0103-5053.20190018

Published online: February 5, 2019

J. Braz. Chem. Soc. 2019, 30(6), 1241-1251

Model Molecules for Evaluating Asphaltene Precipitation Onset of Crude Oils

Rita C. P. Nunes; Michel R. T. Valle; William R. D. Reis; Thiago M. Aversa; Sofia D. Filipakis; Elizabete F. Lucas

How to cite this article

 

The asphaltenes precipitation onset point of crude oil samples that do not have well-defined curves can be ascertained by adding a solution of toluene containing an additive.

http://dx.doi.org/10.21577/0103-5053.20190019

Published online: February 5, 2019

J. Braz. Chem. Soc. 2019, 30(6), 1252-1265

Reduction of Aqueous Ag+ Steered by Electrochemical Plasma: Connecting the Bulk pH Variation with the Reaction Pathways for Hydrated Electrons

Ingrid A. Gonçalves; Jairo Barauna; Fernando J. Cunha-Filho; Osvaldo Chiavone-Filho; Jussier O. Vitoriano; Clodomiro Alves Júnior; Andressa Mota-Lima

How to cite this article

 

The fast acidification promoted by a discharge in nitrogen-based gas phase interferes in the nanoparticles (NP) formation; hydrated electrons induced by an electrochemical discharge are competitively consumed through scavenger reaction (silver reduction) and through the second-order recombination reaction; fact that could only be perceived for discharge in the helium because NP formation and basification are simultaneously observed.

http://dx.doi.org/10.21577/0103-5053.20190020

Published online: February 6, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1266-1275

Synthesis of Hydrotalcite-Supported CdTe Semiconductor Nanocrystals for Electrochemical Detection of Ciprofloxacin

Sanny W. M. M. Carvalho; Tiago B. S. Santana; Charlene R. S. Matos; Luiz P. Costa; Eliana M. Sussuchi; Iara F. Gimenez

How to cite this article

 

Stable CdTe nanocrystals were prepared in a single step route onto the surface of layered double hydroxide as modifier to carbon paste electrodes.

http://dx.doi.org/10.21577/0103-5053.20190021

Published online: February 7, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1276-1283

NMR-Based Metabolomic Screening for Metabolites Associated with Resistance to Meloidogyne javanica in Annona muricata Roots

Alan R. T. Machado; Felipe S. Medeiros; José D. de Souza Filho; Marcelo M. Sena; Willian C. Terra; Lúcia P. S. Pimenta

How to cite this article

 

Induced and pre-formed mechanism defense of Annona muricata against Meloidogyne javanica were detected by nuclear magnetic resonance (NMR)-based metabolomic analysis.

http://dx.doi.org/10.21577/0103-5053.20190022

Published online: February 7, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1284-1292

Simultaneous Determination of 2,3,7,8-TCDD and 2,3,7,8-TCDF in Water Samples by LLE-LTP and HPLC-DAD

Lázaro C. Sicupira; João P. F. Tiago; Gevany P. de Pinho; Flaviano O. Silvério

How to cite this article

 

The image represents liquid-liquid extraction with low-temperature partition (LLE-LTP) methodology combined with high-performance liquid chromatography coupled a diode array detector (HPLC-DAD) used in the present study.

http://dx.doi.org/10.21577/0103-5053.20190024

Published online: February 7, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1293-1301

A Procedure for Assessment of the Reducing Capacity of Plants-Derived Beverages Based on the Formation of the FeII/2,2'-Bipyridine Complex

Rafaela L. Sacchi; Waila E. L. Santana; Cecilia V. Nunez; Horacio D. Moya

How to cite this article

 

In the present study the reduction reaction of FeIII to FeII in aqueous solution containing 2,2'-bipyridine (pH 4.6; acetate buffer) was used as an alternative spectrophotometric method to measure the total reducing capacity of teas and herbs. The method suggested here is fast, simple, reliable and easy to perform.

http://dx.doi.org/10.21577/0103-5053.20190025

Published online: February 12, 2019

J. Braz. Chem. Soc. 2019, 30(6), 1302-1308

Semiconductor Nanocrystals-Reduced Graphene Composites for the Electrochemical Detection of Carbendazim

Paula C. A. Santana; Jéssica B. S. Lima; Tiago B. S. Santana; Luís F. S. Santos; Charlene R. S. Matos; Luiz P. da Costa; Iara F. Gimenez ; Eliana M. Sussuchi

How to cite this article

 

A new nanocomposite based on ZnCdTe semiconductor nanocrystals synthesized in situ on reduced graphene oxide (rGO) was obtained. The modified electrodes were prepared and successfully applied for the determination of carbendazim in orange juice samples.

http://dx.doi.org/10.21577/0103-5053.20190026

Published online: February 12, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1309-1316

Automatized Separation of Fractions from Petroleum Based on Spectrophotometric Signal Derivative Using Open-Source Hardware for the Determination of Ni and V Linked to Porphyrins

Daniel M. Silva; Álvaro J. Pereira; Tatiana D. Saint'Pierre; Pierre M. Esteves ; Anderson A. Rocha ; Rainério Escalfoni Jr.; Christiane Duyck

How to cite this article

 

Open-source device based on Arduino for separation of porphyrins fractions from crude oil is presented and successfully tested.

http://dx.doi.org/10.21577/0103-5053.20190029

Published online: February 20, 2019




J. Braz. Chem. Soc. 2019, 30(6), 1317-1325

Gold Supported on Strontium Surface-Enriched CoFe2O4 Nanoparticles: a Strategy for the Selective Oxidation of Benzyl Alcohol

Laise N. S. Pereira; Carlos E. S. Ribeiro; Aryane Tofanello; Jean C. S. Costa; Carla V. R. de Moura ; Marco A. S. Garcia; Edmilson M. de Moura

How to cite this article

 

This paper deals with the interaction between Sr(OH)2 and CoFe2O4 and their role in the oxidation reaction of benzyl alcohol with gold nanoparticles.

http://dx.doi.org/10.21577/0103-5053.20190030

Published online: February 20, 2019


J. Braz. Chem. Soc. 2019, 30(6), 1326-1333

Determination of Short Chain Fatty Acids in Mice Feces by Capillary Electrophoresis

Letícia A. Marques; Cinthia B. B. Cazarin; Juliano Bicas; Mário R. Maróstica Junior; Emanuel Carrilho; Stanislau Bogusz Junior

How to cite this article

 

Short-chain fatty acids (SCFA) are enteric end-products essential to health. Quantification of SCFA in a small amount of mice feces sample is a big challenge. We developed, validated and applied a method based on capillary electrophoretic with indirect ultraviolet detection for determination of SCFA in mouse feces to evaluate the effect of the consumption of aqueous extract of jabuticaba on mice with induced colitis.

http://dx.doi.org/10.21577/0103-5053.20190031

Published online: February 21, 2019


Short Report J. Braz. Chem. Soc. 2019, 30(6), 1334-1340

Synthesis and Antileishmanial Activity of Some Functionalized Peptoids

Daniel Previdi; Stephanie Rodrigues; Mike G. Coelho; Ana Carolina B. B. Candido; Lizandra G. Magalhães; Paulo M. Donate

How to cite this article

 

This paper describes the microwave-assisted synthesis of thirteen functionalized peptoids and evaluates their in vitro antileishmanial activity against Leishmania (Leishmania) amazonensis promastigotes.

http://dx.doi.org/10.21577/0103-5053.20190023

Published online: February 7, 2019

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