JBCS

15:21, Tue Jan 21

Open Access/APCs

 

JBCS temporally without phone

 

Current Issue vol. 31, No. 2, 2020, p. 211-428

 

This figure illustrates the generation of charge carriers in semiconductor photocatalyst nanoparticles as a result of band gap excitation by sunlight. These charge carriers can then be employed to promote the water splitting reaction for the generation of H2. This transformation is of paramount importance to the solar-to-chemical energy conversion. We review herein the fundamentals of H2 generation from water splitting and representative classes of photocatalytic materials. Details are presented in the Review An Overview of the Photocatalytic H2 Evolution by Semiconductor-Based Materials for Nonspecialists by Ivo F. Teixeira, Jhon Quiroz, Mauricio S. Homsi and Pedro H. C. Camargo on page 211.


Cover Article
J. Braz. Chem. Soc. 2020, 31(2), 211-229

An Overview of the Photocatalytic H2 Evolution by Semiconductor-Based Materials for Nonspecialists

Ivo F. Teixeira ; Jhon Quiroz; Mauricio S. Homsi; Pedro H. C. Camargo

How to cite this article

This figure illustrates the generation of charge carriers in semiconductor photocatalyst nanoparticles as a result of band gap excitation by sunlight. These charge carriers can then be employed to promote the water splitting reaction for the generation of H2. This transformation is of paramount importance to the solar-to-chemical energy conversion. We review herein the fundamentals of H2 generation from water splitting and representative classes of photocatalytic materials. Details are presented in the Review An Overview of the Photocatalytic H2 Evolution by Semiconductor-Based Materials for Nonspecialists by Ivo F. Teixeira, Jhon Quiroz, Mauricio S. Homsi and Pedro H. C. Camargo on page 211.

http://dx.doi.org/10.21577/0103-5053.20190255

Published online: November 7, 2019
Share PDF

Review J. Braz. Chem. Soc. 2020, 31(2), 211-229

An Overview of the Photocatalytic H2 Evolution by Semiconductor-Based Materials for Nonspecialists

Ivo F. Teixeira ; Jhon Quiroz; Mauricio S. Homsi; Pedro H. C. Camargo

How to cite this article

 

We review semiconductor photocatalysts for the H2 evolution reaction that have displayed the best reported activities and quantum efficiencies.

http://dx.doi.org/10.21577/0103-5053.20190255

Published online: November 7, 2019
Share PDF

J. Braz. Chem. Soc. 2020, 31(2), 230-243

Recent Developments on the Elucidation of Colloidal Aspects of Asphaltenes and Their Relevance to Oilfield Problems

Lia B. S. Balestrin ; Watson Loh

How to cite this article

 

This review discusses colloidal aspects of crude oil asphaltenes and their impact on oil production issues.

http://dx.doi.org/10.21577/0103-5053.20190257

Published online: November 8, 2019
Share PDF

Articles J. Braz. Chem. Soc. 2020, 31(2), 244-264

An Acetal Acylation Methodology for Producing Diversity of Trihalomethyl- 1,3‑dielectrophiles and 1,2-Azole Derivatives

Valéria D. O. Bareño; Daiane S. Santos; Leandro M. Frigo; Debora L. de Mello; Juliana L. Malavolta; Rogerio F. Blanco; Lucas Pizzuti; Darlene C. Flores; Alex F. C. Flores

How to cite this article

 

The goal is to demonstrate the scope of the practical acetal acetylation methodology for synthesis of trihalomethyl substituted 1,3-dielectrophiles and their versatility in the preparation of 1,2-azoles.

http://dx.doi.org/10.21577/0103-5053.20190160

Published online: July 15, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 265-272

Development and Validation of a UPLC-ESI-MS Method for Quantitation of the Anti-Alzheimer Drug Galantamine and other Amaryllidaceae Alkaloids in Plants

José R. de Paiva; Ana S. Q. Souza; Rita C. A. Pereira; Paulo R. V. Ribeiro; Guilherme J. Zocolo; Edy S. de Brito; Otília D. L. Pessoa; Kirley M. Canuto

How to cite this article

 

Ultra-performance liquid chromatography coupled to mass spectrometry (UPLC-ESI-MS) method for quantitation of Amaryllidaceae alkaloids.

http://dx.doi.org/10.21577/0103-5053.20190162

Published online: July 16, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 273-279

Sustainability of Biorefinery Processes Based on Baru Biomass Waste

Magale K. D. Rambo ; Michele C. D. Rambo; Polyana M. Melo; Nayra Morgana L. de Oliveira; Yara K. S. Nemet; Elisandra Scapin; Guenther C. C. Viana; Daniel A. Bertuol

How to cite this article

 

Brazilian Cerrado biomass waste was evaluated as potential raw-material for biofuel and bioproduct production in biorefineries.

http://dx.doi.org/10.21577/0103-5053.20190169

Published online: July 23, 2019
Share PDF

J. Braz. Chem. Soc. 2020, 31(2), 280-287

Synthesis and Evaluation of Fenofibric Acid Ester Derivatives: Studies of Different Formulation with Their Bioavailability and Absorption Conditions

Zhixiang Lv; Zhou Wang; Fuyan Xiao; Guofan Jin

How to cite this article

 

A series of fenofibric acid ester pro-drugs were synthesized. The oral administration (20 mg kg-1) of JF-2 showed a relative bioavailability of approximately 272.8% compared to fenofibrate.

http://dx.doi.org/10.21577/0103-5053.20190170

Published online: July 23, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 288-297

A New Strategy for the Synthesis of Nonsymmetrical 3,3'-(Aryl/alkyl-methylene) bis-2-hydroxy-1,4-naphthoquinones and Their Cytotoxic Effects in PC3 Prostate Cancer Cells

Ruan Carlos B. Ribeiro; Paula Priscilla de Freitas; Caroline S. Moreira; Leonardo G. C. de Moraes; Matheus G. de Moraes; Fernando C. da Silva ; David R. Rocha; Etel R. P. Gimba; Vitor F. Ferreira

How to cite this article

 

A novel method for the synthesis of nonsymmetrical 3,3'-(aryl/alkyl-methylene)bis-2-hydroxy-1,4-naphthoquinones was developed by using the Mannich adduct of naphthoquinone and the reaction with another moiety of 2-hydroxy-1,4-naphthoquinone.

http://dx.doi.org/10.21577/0103-5053.20190172

Published online: July 24, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 298-304

Quantification of Glyphosate and AMPA by HPLC-ICP-MS/MS and HPLC-DAD: A Comparative Study

Emanuella M. Pimenta; Fabio F. da Silva; Érica S. Barbosa; Ane P. Cacique; Douglas L. Cassimiro; Gevany P. de Pinho; Flaviano O. Silvério

How to cite this article

 

The image represents the parameters in which high performance liquid chromatography using inductively coupled plasma with triple quadrupole mass spectrometer (HPLC-ICP-MS/MS) was superior to high performance liquid chromatography with diode array detector (HPLC-DAD) in determining glyphosate and aminomethylphosphonic acid (AMPA).

http://dx.doi.org/10.21577/0103-5053.20190175

Published online: July 29, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 305-312

A Highly Selective Colorimetric Sensor for Cysteine Detection

Mengjiao Peng ; Hui Wang; Gregory L. Gibson; Hua Shang; Jianmin Yang; Yan Chen; Yin Lu

How to cite this article

 

Cysteine (Cys) can release CuII ion from the non-fluorescent a-CuII complex. Then hydrolytic cleavage of Schiff base (E)-2-(6-(diethylamino)-2-((2-hydroxyphenylimino)methyl)-3-oxo-3H-xanthen-9-yl)benzoic acid (a) produces a pink fluorescent compound 2-(6-(diethylamino)-2-formyl-3-oxo-3H-xanthen-9-yl)benzoic acid (2). Thus, Cys residues act as a “switch” in an off-on fluorescence system.

http://dx.doi.org/10.21577/0103-5053.20190177

Published online: July 30, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 313-319

Mathematical Modeling of the Transesterification Reaction by Finite Elements: Optimization of Kinetic Parameters Using the Simplex Sequential Method

Diego Galvan; Letícia Thaís Chendynski; Ana Carolina G. Mantovani; Marintho B. Quadri; Mário Killner; Hágata Cremasco; Dionisio Borsato

How to cite this article

 

The transesterification reaction of soybean oil was modeled considering the 3 steps of the direct and reverse reactions following a second order general kinetics by the finite element method.

http://dx.doi.org/10.21577/0103-5053.20190180

Published online: July 31, 2019
Share PDF

J. Braz. Chem. Soc. 2020, 31(2), 320-330

Preparation and Delayed Release Study on Pancreatin Encapsulated into Alginate, Carrageenan and Pectin Hydrogels

Fernanda M. P. Olímpio; Adriano A. Mendes; Marcello G. Trevisan ; Jerusa S. Garcia

How to cite this article

 

Three hydrogels were prepared and applied in pancreatin encapsulation. Alginate hydrogel presented better encapsulation efficiency and enzyme release representing as an alternative to replace the commercial formulation.

http://dx.doi.org/10.21577/0103-5053.20190184

Published online: August 6, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 331-340

GC-MS-Based Metabolomic Profiles Combined with Chemometric Tools and Cytotoxic Activities of Non-Polar Leaf Extracts of Spondias Mombin L. and Spondias Tuberosa Arr. Cam.

Jhonyson A. C. Guedes ; Elenilson G. Alves Filho ; Maria F. S. Silva; Tigressa H. S. Rodrigues; Christiane M. C. Ramires; Maria A. C. Lima; Gisele S. Silva; Cláudia O. Pessoa; Kirley M. Canuto; Edy S. Brito; Ricardo E. Alves; Ronaldo F. Nascimento; Guilherme J. Zocolo

How to cite this article

 

Analytical procedures, from the collection of samples to the correlation of chemical identification with biological activity.

http://dx.doi.org/10.21577/0103-5053.20190185

Published online: August 6, 2019
Share PDF

J. Braz. Chem. Soc. 2020, 31(2), 341-350

Characterizing the Chemical Composition of Lipophilic Extracts from Acacia mearnsii Wood

Gliciane R. A. Oliveira; Fábio S. Grasel ; Gevany P. de Pinho; Flaviano O. Silvério

How to cite this article

 

The constituents that can generate the pitch are in smaller quantities in the extracts of Acacia mearnsii wood in relation to the eucalyptus wood.

http://dx.doi.org/10.21577/0103-5053.20190186

Published online: August 7, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 351-356

Integrative Approach Based on Simplex-Centroid Design, ESI-MS and Chemometric Analysis for Comprehensive Characterization of Phenolic Compounds from Endopleura uchi Bark

Lílian M. Bastos ; Felipe M. A. da Silva ; Leonard R. S. de Souza; Ingrity S. C. Sá; Rochelly S. Mesquita; Afonso D. L. de Souza; Rita de Cássia S. Nunomura

How to cite this article

 

The integrative approach based on simplex-centroid design, electrospray ionization mass spectrometry (ESI-MS), and multivariate analysis provided an effective way to assess the phenolic composition of Endopleura uchi bark.

http://dx.doi.org/10.21577/0103-5053.20190187

Published online: August 7, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 357-363

Pumilacidins A-E from Sediment-Derived Bacterium Bacillus sp. 4040 and Their Antimicrobial Activity Evaluation

Josiane A. M. de Oliveira; David E. Williams; Raymond J. Andersen; Maria H. Sarragiotto; Debora C. Baldoqui

How to cite this article

 

A series of pumilacidins were isolated from the solid culture of the marine-derived bacterium Bacillus sp. 4040. The structures were determined using a combination of mass spectrometry, nuclear magnetic resonance (NMR) spectroscopy and comparison with reported data.

http://dx.doi.org/10.21577/0103-5053.20190188

Published online: August 9, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 364-369

Aromatic Polyketides and Macrolides from Microsphaeropsis arundinis

Weslei Bruno Botero; Marcelo R. de Amorim; Iracilda Z. Carlos; Marisa C. Polesi; Lourdes C. dos Santos

How to cite this article

 

A novel aromatic polyketide isolated from Microsphaeropsis arundinis.

http://dx.doi.org/10.21577/0103-5053.20190189

Published online: August 9, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 370-380

Evaluation of a Graphite-Polyurethane Composite Electrode Modified with Copper Nanoparticles as an Amperometric Flow Detector in a Wall-Jet System for the Determination of Cysteine

Isabela A. Mattioli; Letícia F. L. Schildt; Priscila Cervini; Thalita R. Saciloto; Éder T. G. Cavalheiro

How to cite this article

 

Cysteine (Cys) does not present voltammetric response at bare graphite-polyurethane composite electrode (GPUE) or even at non-treated GPUE containing electrodeposited copper nanoparticles (CuNP). When GPUE-CuNP is electrochemically pretreated in basic medium the Cys response can be observed based on its interaction with Cu oxides at electrode surface allowing analytical applications in an amperometric wall-jet procedure.

http://dx.doi.org/10.21577/0103-5053.20190191

Published online: August 12, 2019
Share PDF

J. Braz. Chem. Soc. 2020, 31(2), 381-393

Experimental and Theoretical Study of LiMn2O4 Synthesized by the Solution Combustion Method Using Corn Starch as Fuel

José M. Siqueira Jr ; Carolina T. Machado; Daniel S. G. Quattrociocchi; Francisco M. S. Garrido; Leonardo M. da Costa; Eduardo A. Ponzio; Glaucio B. Ferreira ; Jackson A. L. C. Resende

How to cite this article

 

LiMn2O4 was synthesized by the solution combustion method using corn starch as fuel with temperature below 700 °C. This synthesis is ecofriendly and has a lower cost than the standard methods. The influence of the Li+ cations amount on the MnO2 oxide structural and electronic properties was also evaluated by the density functional theory (DFT) method.

http://dx.doi.org/10.21577/0103-5053.20190192

Published online: August 14, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 394-401

Ethanol Content Determination in Medicine Syrups Using Headspace and Multidimensional Heart-Cut Gas Chromatography Coupled to Mass Spectrometry

Lilian R. Batista ; Nelson R. Antoniosi Filho

How to cite this article

 

Multidimensional gas chromatography method for ethanol monitoring in medicated syrups in order to question quality certificates from regulatory agencies.

http://dx.doi.org/10.21577/0103-5053.20190193

Published online: August 15, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 402-408

Structural Study of Phenolic Acids by Triple Quadrupole Mass Spectrometry with Electrospray Ionization in Negative Mode and H/D Isotopic Exchange

Nayane B. M. Sinosaki; Angélica P. P. Tonin; Marcos A. S. Ribeiro; Camila B. Poliseli; Sharise B. Roberto ; Roberta da Silveira; Jesuí V. Visentainer; Oscar O. Santos ; Eduardo C. Meurer

How to cite this article

 

Five phenolic acids were evaluated according to the fragmentation profile by collision-induced dissociation (CID) using triple quadrupole mass spectrometry by electrospray ionization in negative ionic mode (ESI(−)-MS/MS), combined with thermochemical data obtained by computational chemistry and hydrogen by deuterium (H/D) exchange.

http://dx.doi.org/10.21577/0103-5053.20190197

Published online: August 20, 2019
Share PDF   Supplementary Information 

J. Braz. Chem. Soc. 2020, 31(2), 409-420

PMMA-SiO2 Organic-Inorganic Hybrid Coating Application to Ti-6Al-4V Alloy Prepared through the Sol-Gel Method

Joseane A. Santana; Sandra R. Kunst; Cláudia T. Oliveira; Antonio A. Bastos; Mario G. S. Ferreira ; Victor H. V. Sarmento

How to cite this article

 

Hybrid coating application to Ti-6Al-4V alloy prepared through the sol-gel method.

http://dx.doi.org/10.21577/0103-5053.20190198

Published online: August 20, 2019
Share PDF

J. Braz. Chem. Soc. 2020, 31(2), 421-428

Thermal Infrared Enthalpimetry in Paper Microzone Plates for Green and High Throughput Determination of Wine Acidities

Daniele F. Ferreira; Bruna Tischer; Alexandre J. Cichoski; Cristiano R. Menezes; Roger Wagner; Adilson B. Costa; Juliano S. Barin

How to cite this article

 

Wine samples were added in the hydrophilic microzones of a paper device followed by addition of NaOH solution in stoichiometric excess. An infrared camera was used to record the analytical operations. The neutralization reaction releases heat, and the temperature of solutions rises, and it could be directly related to the wine acidity.

http://dx.doi.org/10.21577/0103-5053.20190199

Published online: August 20, 2019
Share PDF   Supplementary Information 

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

Tel/Fax: +55.19.3521.3151
Free access

GN1