JBCS

0:17, Mon Aug 26

Open Access/APCs

Forthcoming Papers - 2019

Articles published online ahead of print




Articles 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.


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.

J. Braz. Chem. Soc. 2019

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

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.


J. Braz. Chem. Soc. 2019

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

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.

J. Braz. Chem. Soc. 2019

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

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.


J. Braz. Chem. Soc. 2019

Structure and Absolute Configuration of Secondary Metabolites from Two Strains of Streptomyces chartreusis Associated with Attine Ants

Humberto E. Ortega ; João M. Batista Jr. ; Weilan G. P. Melo ; Gabriela T. de Paula; Mônica T. Pupo

Natural products produced by Streptomyces chartreusis strains associated to Brazilian fungus-growing ants. Absolute configurations of strepchazolin A (3) and strepchazolin B (4) were determined by vibrational circular dichroism (VCD) and ecological function of cyclooctasulfur (5) was established.

http://dx.doi.org/10.21577/0103-5053.20190194

Published online: August 15, 2019.


J. Braz. Chem. Soc. 2019

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

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.


J. Braz. Chem. Soc. 2019

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

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.


J. Braz. Chem. Soc. 2019

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

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.

J. Braz. Chem. Soc. 2019

Aromatic Polyketides and Macrolides from Microsphaeropsis arundinis

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

A novel aromatic polyketide isolated from Microsphaeropsis arundinis.

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

Published online: August 9, 2019.


J. Braz. Chem. Soc. 2019

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

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.


J. Braz. Chem. Soc. 2019

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

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.


J. Braz. Chem. Soc. 2019

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

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.


J. Braz. Chem. Soc. 2019

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 Ó. Pessoa; Kirley M. Canuto; Edy S. Brito; Ricardo E. Alves; Ronaldo F. Nascimento; Guilherme J. Zocolo

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.

J. Braz. Chem. Soc. 2019

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

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.


J. Braz. Chem. Soc. 2019

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

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.

J. Braz. Chem. Soc. 2019

Interplay between Near-Field Properties and Au Nanorod Cluster Structure: Extending Hot Spots for Surface-Enhanced Raman Scattering

Klester S. Souza; Erico Teixeira-Neto; Marcia L. A. Temperini; Diego P. dos Santos

Correlation between surface-enhanced Raman scattering (SERS) spectrum and gold nanorod cluster structure; end-to-end with side-by-side interactions may lead to strong enhancements.

http://dx.doi.org/10.21577/0103-5053.20190179

Published online: July 31, 2019.


J. Braz. Chem. Soc. 2019

A Highly Selective Colorimetric Sensor for Cysteine Detection

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

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.


J. Braz. Chem. Soc. 2019

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

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.


J. Braz. Chem. Soc. 2019

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 de C. da Silva ; David R. Rocha; Etel R. P. Gimba; Vitor F. Ferreira

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.


J. Braz. Chem. Soc. 2019

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

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.


J. Braz. Chem. Soc. 2019

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

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.

J. Braz. Chem. Soc. 2019

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 de C. A. Pereira; Paulo R. V. Ribeiro; Guilherme J. Zocolo; Edy S. de Brito; Otília D. L. Pessoa; Kirley M. Canuto

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.


J. Braz. Chem. Soc. 2019

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

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.


J. Braz. Chem. Soc. 2019

Cytotoxic Activity of Synthetic Chiral Amino Acid Derivatives

Pedro P. de Castro; Raoni P. Siqueira; Luiza Conforte; Chris H. J. Franco; Gustavo C. Bressan; Giovanni W. Amarante

Forty amino acids derivatives were assayed towards four different cancer lines and two normal strains. Three derivatives were found with mean half-maximal inhibitory concentration (IC50) at the low micromolar range. The N-alkyl diamine associated with an amino acid scaffold showed promising results.

http://dx.doi.org/10.21577/0103-5053.20190157

Published online: July 12, 2019.


J. Braz. Chem. Soc. 2019

Resorcinolic Lipids from Yucatecan Propolis

Mercedes G. Herrera-López; Evelyn I. Rubio-Hernández; Pascal Richomme; Andreas Schinkovitz; Luz M. Calvo-Irabién; Luis M. Peña Rodríguez

Argentation chromatography purification of a Yucatecan propolis extract with antioxidant activity allowed the identification of six resorcinolic lipids.

http://dx.doi.org/10.21577/0103-5053.20190156

Published online: July 11, 2019.


J. Braz. Chem. Soc. 2019

Microwave Assisted Ultra-Fast Method to Synthesize Carbonate-Phosphates, Na3MCO3PO4 (M = Mn, Fe, Co, Ni) - Relevant Materials Applied in Sodium-Ion Batteries

Demétrio A. S. Costa; Lorena A. C. Costa; João O. Mendes; Wagner N. Mussel; José D. Ardisson; Luciano A. Montoro

It is described herein an ultra-fast hydrothermal microwave assisted method for obtaining a series of sodium-carbonate-phosphate compounds, Na3MCO3PO4 (M = Mn, Fe, Co or Ni) upon 5 min thermal processing, and with relevant application as cathode material in Na-ion batteries.

http://dx.doi.org/10.21577/0103-5053.20190154

Published online: July 11, 2019.


J. Braz. Chem. Soc. 2019

Well Defined Rich Electronic Structure: Facile Approach for Nido-Carborane Fused Azaspirodecaniums in Water Solution

Zhixiang Lv; Zhou Wang; Fuyan Xiao; Guofan Jin

Facile approach for nido-carborane fused azaspirodecaniums in water solution.

http://dx.doi.org/10.21577/0103-5053.20190152

Published online: July 3, 2019.


J. Braz. Chem. Soc. 2019

Selective Inner-Filter on the Fluorescence Response of Chlorophyll and Pheophytin Molecules Extracted from Caesalpinia echinata Leaves

Jefferson M. S. Lopes; Sanclayton G. C. Moreira; Newton M. Barbosa Neto

Stepwise extraction of molecules from Brazil-wood by methanol implies in the selective inner-filter on chlorophyll a fluorescence.

http://dx.doi.org/10.21577/0103-5053.20190150

Published online: July 2, 2019.


J. Braz. Chem. Soc. 2019

Solvothermal Synthesis of Cerium-Doped Titania Nanostructured Materials Modified with Acetylacetone for Solar-Driven Photocatalysis

Bruno A. T. Menezes; Daniel E. B. Moreira; Hugo A. Oliveira; Lippy F. Marques; Juliana F. Lima

Cerium addition reduces the bandgap energy of new nanostructured TiO2:Cex% photocatalysts from ca. 3.0 to 1.45 eV. Mild photocatalysis conditions can be efficiently applied to degrade dyes.

http://dx.doi.org/10.21577/0103-5053.20190148

Published online: June 28, 2019.


J. Braz. Chem. Soc. 2019

Dextrorotatory Chromomycins from the Marine Streptomyces sp. Associated to Palythoa caribaeorum

Francisco C. L. Pinto ; Edilberto R. Silveira ; Ana Caroline L. Vasconcelos; Katharine G. D. Florêncio; Francisca A. S. Oliveira; Bianca B. Sahm; Letícia V. Costa-Lotufo ; Anelize Bauermeister; Norberto P. Lopes; Diego V. Wilke ; Otília D. L. Pessoa

This paper describes the isolation and structure elucidation of four dextrorotatory chromomycins from a cytotoxic extract produced by a Streptomyces bacteria strain recovered from the zoanthid P. caribaeorum, collected at Pedra Rachada Beach, located on the west coast of Ceará State.

http://dx.doi.org/10.21577/0103-5053.20190144

Published online: June 25, 2019.


J. Braz. Chem. Soc. 2019

A New Tetraglycosylated Flavonoid from Leaves of Platycyamus regnellii Benth. Isolated by High-Speed Countercurrent Chromatography

Carla M. Leal; Ricardo M. Borges; Rosineide C. Simas; Fernanda N. Costa; Gilda G. Leitão

A new tetraglycosylated flavonoid was isolated from the butanol extract of leaves of Platycyamus regnellii using high-speed countercurrent chromatography (HSCCC).

http://dx.doi.org/10.21577/0103-5053.20190143

Published online: June 21, 2019.


J. Braz. Chem. Soc. 2019

Multi-Element Evaluation in Black Pepper (Piper nigrum L.) According to the Processing

Maiara Krause; Luiza V. Vieira; Tiago P. Cunha; Geisamanda P. Brandão; Paulo Roberto Filgueiras; Maria Tereza W. D. Carneiro

Influence of black pepper processing on trace element levels.

http://dx.doi.org/10.21577/0103-5053.20190141

Published online: June 19, 2019.


J. Braz. Chem. Soc. 2019

Concomitant Production of Hydrogen, Sodium Acetate, and Polymerized Species from Non-Catalytic Ethanol Dehydrogenation

Bárbara B. Cazula ; Eduardo C. Meurer; Alan M. Fortes; Angelica P. Tonin; Lázaro J. Gasparrini; Carlos I. Yamamoto; Helton J. Alves

A detailed study of the production of hydrogen, sodium acetate and high added-value liquid products from the ethanol dehydrogenation reaction.

http://dx.doi.org/10.21577/0103-5053.20190139

Published online: June 18, 2019.

J. Braz. Chem. Soc. 2019

Strontium Oxide Decorated Iron Oxide Activated Carbon Nanocomposite: A New Adsorbent for Removal of Nitrate from Well Water

Mohammad K. M. Nodeh; Gholamreza N. Bidhendi; Mohammad A. Gabris; Behrouz Akbari-adergani; Hamid R. Nodeh; Aliakbar Masoudi; Syed Shahabuddin

Magnetized activated carbon by iron oxide and modified by positively charged strontium based nanoparticles (FeAC@Sr) introduced an efficient adsorbent for the removal of negatively charged nitrate ions from underground water.

http://dx.doi.org/10.21577/0103-5053.20190138

Published online: June 17, 2019.

J. Braz. Chem. Soc. 2019

Magnetic Solid-Phase Microextraction for Lead Detection in Aqueous Samples Using Magnetite Nanoparticles

Carolina A. S. Silva; Raphael L. S. e Silva; Alberthmeiry T. de Figueiredo; Vanessa N. Alves

A microextraction and preconcentration methodology using magnetite nanoparticles for lead determination in aqueous samples.

http://dx.doi.org/10.21577/0103-5053.20190134

Published online: June 7, 2019.

J. Braz. Chem. Soc. 2019

Performance of Avocado Seed Activated Carbon as Adsorbent for Highly Sensitive Determination of Cd Using a Flow Injection System Online Coupled to TS-FF-AAS

Marianne V. F. Kudo; Leandro L. G. de Oliveira; Fabio A. C. Suquila; Fernanda G. de Almeida; Mariana G. Segatelli; Éder C. Lima; Silvio L. P. Dias; César R. T. Tarley

Avocado seed activated carbon as adsorbent for online Pb2+ preconcentration and thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) determination.

http://dx.doi.org/10.21577/0103-5053.20190132

Published online: June 7, 2019.

J. Braz. Chem. Soc. 2019

Acid-Catalyzed Z-E Isomerization of γ-Alkylidenebutenolides: An Experimental and DFT Study

Jodieh O. S. Varejão; Luiz C. A. Barbosa; Eduardo V. V. Varejão; Aline H. Souza; Mateus R. Lage; José W. M. Carneiro

Acid-catalyzed Z-E isomerization of γ-alkylidenebutenolide observed from experiments and studied using DFT.

http://dx.doi.org/10.21577/0103-5053.20190131

Published online: June 7, 2019.


Short Report J. Braz. Chem. Soc. 2019

TiO2 Decorated Sand Grains for Photodegradation of Pollutants: Methylene Blue and Ciprofloxacin Study

Jorge A. S. Lacerda; Allan M. Macedo; Rodolfo I. Teixeira; Grazieli Simões; Emerson S. Ribeiro ; Josué S. B. Forero; Rodrigo J. Corrêa

Methylene blue (MB) photooxidation over TiO2 decorated sand grains.

http://dx.doi.org/10.21577/0103-5053.20190129

Published online: June 6, 2019.


Articles J. Braz. Chem. Soc. 2019

Integrative Approach Based on Leaf Spray Mass Spectrometry, HPLC‑DAD‑MS/MS, and NMR for Comprehensive Characterization of Isoquinoline-Derived Alkaloids in Leaves of Onychopetalum amazonicum R. E. Fr.

Bruna R. de Lima; Felipe M. A. da Silva ; Elzalina R. Soares; Richardson A. de Almeida; Francinaldo A. da Silva-Filho; Andersson Barison; Emmanoel V. Costa; Hector H. F. Koolen ; Afonso D. L. de Souza; Maria Lúcia B. Pinheiro

The integrative approach based on mass spectrometry (MS) and nuclear magnetic resonance (NMR) techniques showed to be a useful strategy for comprehensive characterization of isoquinoline-derived alkaloids.

http://dx.doi.org/10.21577/0103-5053.20190125

Published online: June 5, 2019.


J. Braz. Chem. Soc. 2019

Synthesis, Characterization and Conformational Analysis of Two Novel 4(1H)‑Quinolinones

Lidiane J. Michelini ; Wesley F. Vaz; Luiz F. N. Naves; Caridad N. Pérez; Hamilton B. Napolitano

Differences noted on highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), molecular electrostatic potential (MEP) and supramolecular arrangement of two novel 4(1H) quinolinones are associated to substituents chlorine and nitro.

http://dx.doi.org/10.21577/0103-5053.20190124

Published online: June 5, 2019.


J. Braz. Chem. Soc. 2019

Investigating Surface Properties and Lithium Diffusion in Brookite-TiO2

Corinne Arrouvel ; Stephen Charles Parker

Highlighting the stability, the surface properties of brookite TiO2 versus its polymorphs and revisiting the observed morphologies for lithium batteries and catalysis.

http://dx.doi.org/10.21577/0103-5053.20190123

Published online: June 5, 2019.


J. Braz. Chem. Soc. 2019

New Proposal for Sugarcane Vinasse Treatment by Hydrothermal Carbonization: An Evaluation of Solid and Liquid Products

Laís G. Fregolente; Antonio J. R. de Castro; Altair B. Moreira; Odair P. Ferreira; Márcia C. Bisinoti

Applying hydrothermal carbonization as treatment process to vinasse a solid is generated, rich in nutrients, and a liquid phase cleaner than vinasse.

http://dx.doi.org/10.21577/0103-5053.20190122

Published online: June 3, 2019.


J. Braz. Chem. Soc. 2019

Direct Analysis of Human Hair Before and After Cosmetic Modification Using a Recent Data Fusion Method

Mônica C. Santos; Fabíola M. V. Pereira

Direct analysis of human hair can help to identify an individual. Fusion data improved chemical information for hair samples.

http://dx.doi.org/10.21577/0103-5053.20190121

Published online: May 31, 2019.


J. Braz. Chem. Soc. 2019

Determination of Catechol and Hydroquinone by Using Perilla frutescens Activated Carbon Modified Glassy Carbon Electrode

Meiqin Zheng ; Jingjing Zhu; Rongrong Fan; Yujie Wang; Zhaojun Lv; Yongming Han; Jun Peng; Xinyu Zheng; Ruiyu Lin

Hydroquinone (HQ) and catechol (CC) cannot be separated at the bare glassy carbon electrode (GCE). On the contrary, distinguishable redox peaks of HQ and CC can be observed at high specific surface area activated carbon prepared by Perilla frutescens (PFHSAAC)/GCE. So it is possible to determine HQ and CC by using PFHSAAC/GCE.

http://dx.doi.org/10.21577/0103-5053.20190120

Published online: May 30, 2019.

J. Braz. Chem. Soc. 2019

Use of Arduino in the Development of a New and Fast Automated Online Preconcentration System Based on Double-Knotted Reactor for the Mn Determination in Tea Samples by Flame Atomic Absorption Spectrometry

Jeferson A. Barreto; Valfredo A. Lemos; Djalma M. de Oliveira; Uillian Mozart F. M. Cerqueira; Lucília A. Meira; Marcos A. Bezerra

Arduino was used to develop an automated preconcentration system based on double-knotted reactor (KR) for Mn determination in tea leaves.

http://dx.doi.org/10.21577/0103-5053.20190118

Published online: May 28, 2019.

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