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Autores: A partir do fascículo 39/9 a revista Química Nova adotou a licença CC-BY. Mais informações a respeito dessa licença podem ser obtidas aqui.

Artigos no Prelo


Artigos

DETERMINAÇÃO DE POTÁSSIO EM ROCHAS SILICÁTICAS POR ESPECTROMETRIA DE EMISSÃO ATÔMICA COM CHAMA APÓS DISSOLUÇÃO ASSISTIDA POR ULTRASSOM

Daiane L. Baldez; Liziane O. Avila; Daiane P. Torres; Rosane Martinazzo; Carlos A. P. Silveira; Mariana A. Vieira

This paper presents a simple method for the determination of K in silicate rocks by flame atomic emission spectrometry.

http://dx.doi.org/10.21577/0100-4042.20170290

Publicado online: setembro 19, 2018
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PLACAS CERÂMICAS CONTENDO LODO DE ETA E CINZA DE CASCA DE ARROZ: CORRELAÇÃO DE SUAS PROPRIEDADES FÍSICO-QUÍMICAS COM SUA MICROESTRUTURA

Antônio R. Petterle; Gustavo G. Santiago; Wang Chong; Luciani Somensi; Sílvia M. Tamborim

The silica from rice husk ash and the sludge from a water treatment plant when inserted in kaolinite clay provide an increase on vitreous phases as mulite and cristobalite in ceramic plates generating a high mechanical and thermal resistance.

http://dx.doi.org/10.21577/0100-4042.20170288

Publicado online: setembro 18, 2018
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INFLUENCE OF LOW AND HIGH GLYCEROL CONCENTRATIONS ON WETTABILITY AND FLEXIBILITY OF CHITOSAN BIOFILMS

Erveton P. Pinto; Walter de S. Tavares; Robert S. Matos; Adriana M. Ferreira; Rodrigo P. Menezes; Marcelo Eduardo H. M. da Costa; Tiago M. de Souza; Irlon M. Ferreira; Franscisco Fábio O. de Sousa; Robert Ronald M. Zamora

Biofilms prepared by the casting technique (CH, CHG1 and CHG2); measurement of hardness and elastic modulus by linear regression of the contact angle to assess glycerol influence over the wettability and flexibility of biofilms.

http://dx.doi.org/10.21577/0100-4042.20170287

Publicado online: setembro 18, 2018
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SÍNTESE DE Nb2O5, Al2O3 E Nb2O5/Al2O3 VIA MÉTODO DE PECHINI COMO PRÉ-TRATAMENTO ALTERNATIVO PARA ESQUEMAS DE PINTURA DO AÇO CARBONO AISI 1005

Yuri H. P. Café; Elber V. Bendinelli; Cristina C. Amorim; Alberto P. Ordine; Eliane D'Elia; Emerson S. Ribeiro

Nb2O5 (NbPC), Al2O3 (AlPC) and Nb2O5/Al2O3 (NbAlPC) as alternative pretreatment for carbon steel AISI 1005 coating systems and subsequent analysis by Electrochemical Impedance.

http://dx.doi.org/10.21577/0100-4042.20170286

Publicado online: setembro 13, 2018
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POLYPHENOL AND TRITERPENOID CONSTITUENTS OF Eugenia florida DC. (MYRTACEAE) LEAVES AND THEIR ANTIOXIDANT AND CYTOTOXIC POTENTIAL

Priscila F. P. Santos; Luiz N. L. F. Gomes; José L. Mazzei; Ana Paula A. Fontão; André L. F. Sampaio; Antonio C. Siani; Ligia M. M. Valente

Twenty-nine compounds were revealed by GC-MS and UFLC-DAD-MS/MS in the leaves of Eugenia florida as well as their antioxidant and cytotoxic activities.

http://dx.doi.org/10.21577/0100-4042.20170284

Publicado online: setembro 11, 2018
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ESTUDO TEÓRICO DE POTENCIAIS AGENTES PARA O TRATAMENTO DA DOENÇA DE ALZHEIMER DERIVADOS DA 8-HIDROXIQUINOLINA COM SUBSTITUINTES DO TIPO N-ACIL-HIDRAZONA

Talis U. da Silva; Leonardo Viana de Freitas; Nicolás A. Rey; Sérgio de Paula Machado

Formation shceme of Zn(II) complexes with 8-HQ derivatives with substituents N-acyl-hidrazone type substituents and two chloros

http://dx.doi.org/10.21577/0100-4042.20170283

Publicado online: setembro 4, 2018
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HIDRÓLISE ENZIMÁTICA, FERMENTAÇÃO E PRODUÇÃO DE BIOCOMBUSTÍVEIS ATRAVÉS DA COROA DE Ananas comosus

Jumelice dos S. Silva; Valéria R. dos S. Malta; Martha S. R. dos Santos-Rocha; Renata M. R. G. Almeida; Márcia A. Gomes; Cecília D. Vicente; Kledson L. Barbosa

Ananas comosus crown was applied for water-based pretreatment at moderate temperatures and enzymatic hydrolysis and fermentation experiments for ethanol and briquettes production.

http://dx.doi.org/10.21577/0100-4042.20170281

Publicado online: agosto 29, 2018
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INFLUÊNCIA DA RIGIDEZ DO MEIO NA CINÉTICA DO FOTOCROMISMO DE DITIZONATOS METÁLICOS

Cristiane Lázara de Barros; Newton Martins Barbosa Neto; Antonio Otavio T. Patrocinio

Spectral changes due to the isomerization of mercury dithizonate(II) in PMMA at 298 K.

http://dx.doi.org/10.21577/0100-4042.20170280

Publicado online: agosto 27, 2018
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IMOBILIZAÇÃO DE PEROXIDASE DE RAIZ FORTE EM BAGAÇO DE CANA-DE-AÇÚCAR

Monna Lisa B. Queiroz; Kennedy C. da Conceição; Micael Nunes Melo; Osmar Calderón Sánchez; Heiddy M. Alvarez; Cleide M. F. Soares; Alini T. Fricks

Immobilization of HRP on sugarcane bagasse by physical adsorption (ADS) and covalent bond (LC) on activated support by 2.5% (v/v) glutaraldehyde (GA).

http://dx.doi.org/10.21577/0100-4042.20170279

Publicado online: agosto 22, 2018
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INFLUÊNCIA DA NANOEMULSÃO DE ÓLEO ESSENCIAL DE LIMÃO EM FILMES À BASE DE GELATINA

Juliana C. Nunes; Pamela Thais S. Melo; Fauze A. Aouada; Marcia R. de Moura

Filmogenic solution was obtained by stirring the lemon essential oil on the Turrax stirrer and adding gelatin powder in the nanoemulsion to form the films.

http://dx.doi.org/10.21577/0100-4042.20170277

Publicado online: agosto 21, 2018
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ARSENIC AND TRACE METALS IN WATER AND SEDIMENT OF THE VELHAS RIVER, SOUTHEASTERN IRON QUADRANGLE REGION, MINAS GERAIS, BRAZIL

Danilo de C. Silva; Carlos R. Bellato; José de O. Marques Neto; Maurício P. F. Fontes

The Velhas River contains high amounts of arsenic and metals in water and sediment samples. BCR method was used to investigate its bioavailability in the sediment. All sediments samples presented As and metals associated with easily mobilized fractions.

http://dx.doi.org/10.21577/0100-4042.20170275

Publicado online: agosto 21, 2018
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COMPOSIÇÃO QUÍMICA E ATIVIDADE ANTINOCICEPTIVA EM MODELO ANIMAL DO ÓLEO ESSENCIAL DE Myrcia rostrata DC. (MYRTACEAE)

Aline do Nascimento Silva; Horácio Freitas Bomfim; Acsa Oliveira Magalhães; Marilene Lopes da Rocha; Angélica Maria Lucchese

Antinociceptive potential of the essential oil obtained from fresh Myrcia rostrata DC. leaves evidenced by the reduction in the number of abdominal writhes induced by acetic acid in mice.

http://dx.doi.org/10.21577/0100-4042.20170274

Publicado online: agosto 21, 2018
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DISTRIBUIÇÃO DE ELEMENTOS TRAÇO EM TECIDOS DE Goniopsis cruentata (LATREILLE, 1803) CAPTURADOS NOS MANGUEZAIS DO SUL DA BAHIA - BRASIL E AVALIAÇÃO DO POTENCIAL DE RISCO NO CONSUMO

Luanna M. Carneiro; Danilo J. G. da Silva; Luan C. G. dos Reis; Daiane A. F. de Oliveira; Laís da C. Maciel; Karina S. Garcia; Sarah A. R. Soares; Antônio F. de S. Queiroz

The presence of selected metals in tissues of G. cruentata can represent a potential human health risk to the consumer.

http://dx.doi.org/10.21577/0100-4042.20170272

Publicado online: agosto 14, 2018
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EFEITOS DE NANOPARTÍCULAS COMERCIAIS DE ÓXIDO DE FERRO (Fe2O3): CITOTOXICIDADE, GENOTOXICIDADE E ESTRESSE OXIDATIVO

Tatiane Balbo Batista-Gallep; Tatiane Pasquoto-Stigliani; Mariana Guilger; Diogo Torres Rheder; Tais Germano-Costa; Natalia Bilesky-José; Leonardo Fernandes Fraceto; Cleoni dos Santos Carvalho; Renata de Lima

This study shows toxicity results of commercial iron oxide nanoparticles.

http://dx.doi.org/10.21577/0100-4042.20170271

Publicado online: agosto 14, 2018
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ESPECTROSCOPIA FOTOACÚSTICA PARA ANALISAR A FERTILIDADE DE SOLOS TRATADOS COM BIOCHAR E MICORRIZA

Ellen Conceição T. de Matos; Luciana A. Rodrigues; Pamella de A. Souza; Renato V. da Silva;

Soil substrates must exhibit physical and chemical properties in such way that a high capacity to supply the nutritional demand can be guaranteed, taking into account environmental standards.

http://dx.doi.org/10.21577/0100-4042.20170270

Publicado online: agosto 14, 2018
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MEASURING THE LIGHT CRUDE OIL (LCO) CONTENT IN STANDARD BIODIESEL/LCO BLENDS BY THERMAL ANALYSIS

Luis Díaz-Ballote; Norberto U. García-Cruz; Emanuel Hernández-Nuñez; Andrea Castillo-Atoche; Gerardo González-García; Geonel Rodriguez-Gattorno

Differential scanning calorimetry (DSC) was demonstrated to be a helpful tool to determine the light crude oil (LCO) fraction in biodiesel/LCO blends. DSC results were validated with nuclear magnetic resonance (NMR).

http://dx.doi.org/10.21577/0100-4042.20170268

Publicado online: julho 31, 2018
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RECOVERY OF LEAD AND NOBLE METALS AFTER PROCESSING PRINTED CIRCUIT BOARDS FROM CELL PHONES BY LEACHING WITH MIXTURES CONTAINING HYDROGEN FLUORIDE

Walner Costa Silva; Roger de Souza Corrêa; Pedro Rosário Gismonti; Júlio Carlos Afonso; Rubens Souza da Silva; Cláudio Augusto Vianna; José Luiz Mantovano

Hydrometallurgical process for printed circuit boards from cell phones using HF + oxidant mixtures under mild experimental conditions. Lead and noble metals were recovered from the insoluble matter.

http://dx.doi.org/10.21577/0100-4042.20170267

Publicado online: julho 31, 2018
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Revisão

MOFs (METAL-ORGANIC FRAMEWORKS): UMA FASCINANTE CLASSE DE MATERIAIS INORGÂNICOS POROSOS

Regina C. G. Frem; Guilherme Arroyos; Jader B. da Silva Flor; Renata C. Alves; Guilherme N. Lucena; Caroline M. da Silva; Mariana F. Coura

Metal-Organic Frameworks (MOFs) are a class of porous inorganic solids, in a borderline area between coordination chemistry and material science. Recent research progress in synthesis and potential environmental applications are discussed in this paper.

http://dx.doi.org/10.21577/0100-4042.20170285

Publicado online: setembro 11, 2018
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AVANÇOS QUÍMICOS NO PLANEJAMENTO E DESENVOLVIMENTO DE DERIVADOS DO PARACETAMOL

Rosivaldo S. Borges; Ana Carolina S. P. S. Jesus; Laice F. Cardoso; Clícia L. Neria; Roberto B. Morais; Valéria A. Barros; Albérico B. F. da Silva

Acetaminophen or paracetamol is a simplified chemical structure of aniline derivatives and it is used as analgesic agent. Several modifications in its structure particularly on electronic and solubility parameters were performed, seeking the development of safer derivatives.

http://dx.doi.org/10.21577/0100-4042.20170282

Publicado online: setembro 3, 2018
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RECENTES AVANÇOS EM REAÇÕES ORGÂNICAS CATALISADAS POR NÍQUEL

Danielle L. J. Pinheiro; Giovanni W. Amarante

This review covers some recent work by using Nickel catalysis. In this context, challenged organic transformations, synthetic applications and mechanism investigations are described.

http://dx.doi.org/10.21577/0100-4042.20170269

Publicado online: julho 31, 2018
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Nota Técnica

CONSTRUÇÃO DE UMA BOMBA PERISTÁLTICA E DE UM SISTEMA DE DETECÇÃO UTILIZANDO UM HARDWARE DE CÓDIGO FONTE ABERTO "ARDUINO" PARA ANÁLISE EM FLUXO

Fernanda S. C. Soares; Alan L. Vieira; Márcio S. Soares; Marcus V. Sant'Anna; Rejane Nascentes; Carla M. Bossu

Low-cost flow analysis system: the peristaltic pump and the photometer developed in this work allow the implementation of practical disciplines, such as molecular absorption spectrophotometry and flow analysis system in undergraduate chemistry courses.

http://dx.doi.org/10.21577/0100-4042.20170289

Publicado online: setembro 18, 2018
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STRAIGHTFORWARD, ECONOMICAL PROCEDURES FOR MICROSCALE ELLMAN'S TEST FOR CHOLINESTERASE INHIBITION AND REACTIVATION

Samir F. de A. Cavalcante; Daniel A. S. Kitagawa; Rafael B. Rodrigues; Monique Cardozo; Reuel L. de Paula; Ana Beatriz de A. Correa; Alessandro B. C. Simas

Based on spectrophotometry, Ellman's assay correlates activity of cholinesterases with Beer's Law. In absence of an organophosphorus inhibitor, formation of thiol chromophore leads to higher absorbance, which means high activity.

http://dx.doi.org/10.21577/0100-4042.20170278

Publicado online: agosto 22, 2018
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APLICAÇÃO DE PROGRAMA COMPUTACIONAL LIVRE EM PLANEJAMENTO DE EXPERIMENTOS: UM TUTORIAL

Fabíola Manhas Verbi Pereira; Edenir Rodrigues Pereira-Filho

Factorial design: use of free software and videos for better data interpretation.

http://dx.doi.org/10.21577/0100-4042.20170254

Publicado online: junho 28, 2018
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POTENCIAL EXPOSIÇÃO AO MERCÚRIO ATMOSFÉRICO NO AMBIENTE OCUPACIONAL DE COMÉRCIOS DE OURO DE PORTO VELHO, RONDÔNIA

Leidiane C. Lauthartte; Diego F. Gomes; Marília H. Mussy; Ígor B. B. de Holanda; Ronaldo Almeida; Wanderley R. Bastos

Alluvial gold mining dredge on the Madeira river. The gold extracted by the dredges is taken to the city of Porto Velho for commercialization, where the its smelting and Hg exposure occurs in the atmosphere of specialized stores.

http://dx.doi.org/10.21577/0100-4042.20170253

Publicado online: junho 28, 2018
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Educação

DETERMINAÇÃO DE CÁDMIO EM BIJUTERIAS ORIUNDAS DA CHINA

Ariane R. Pais; Larissa N. Dina; Evandro R. Alves; Hélen C. de Rezende; Luís A. da Silva; Valéria A. Alves

This study aimed to identify cadmium in low-cost jewelry from China. In the qualitative test, sulfide was used as precipitating agent. Quantification of Cd2+ was performed by atomic absorption spectrometry. The content of Cd was ~ 30% (w/w) in one of the investigated pieces.

http://dx.doi.org/10.21577/0100-4042.20170276

Publicado online: agosto 21, 2018
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BIOFUELS FROM COCONUT FAT AND SOYBEAN OIL: MICROWAVE-ASSISTED SYNTHESIS AND GAS CHROMATOGRAPHY/MASS SPECTROMETRY ANALYSIS

Amanda C. Pinheiro; André B. Gonçalves; Wilhelm J. Baader; Lydia F. Yamaguchi; Naved I. Malek; Erick L. Bastos; Omar A. El Seoud

Methods for biofuel analysis, a topic with relevant socio-economic impact were discussed and compared to help students to gain insight into transesterification mechanism, an important example of acyl-transfer reactions.

http://dx.doi.org/10.21577/0100-4042.20170273

Publicado online: agosto 21, 2018
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O TEMA CARBOIDRATOS ATRAVÉS DA METODOLOGIA DE ESTUDOS DE CASO: DESENVOLVIMENTO DE CONTEÚDOS CONCEITUAIS, PROCEDIMENTAIS E ATITUDINAIS

Kamila dos Passos; Leandra F. Campo; Daniele P. Daniel; Franciane S. C. de Lima; Camila G. Passos

The use of case resolution on the reduction of sugar content in processed natural juices for the training of future professionals of Chemistry.

http://dx.doi.org/10.21577/0100-4042.20170263

Publicado online: julho 23, 2018
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MICROWAVE-ASSISTED SYNTHESIS AND PKA DETERMINATION OF UMBELLIFERONE: AN EXPERIMENT FOR THE UNDERGRADUATE ORGANIC CHEMISTRY LABORATORY

Thiago M. Pereira; Daiana F. P. Franco; Felipe Vitório; Ronaldo C. Amaral; Aparecida C. Ponzonia; Arthur E. Kümmerle

Microwave-assisted synthesis of umbelliferone (7-OH-coumarin) carried out in a domestic microwave oven. Observation of its fluorescence and deprotonation in basic conditions under UV-365 nm lamp.

http://dx.doi.org/10.21577/0100-4042.20170262

Publicado online: julho 23, 2018
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IDENTIFICAÇÃO DE ADULTERAÇÃO EM ÓLEOS DE OLIVA: PROBLEMATIZANDO A INTRODUÇÃO À ESPECTROMETRIA DE MASSAS

Angélica Priscila Parussolo Tonin; Gabrielly Ribeiro Carneiro; Marcos Alessandro dos Santos Ribeiro; Jaime da Costa Cedran; Valquíria de Moraes Silva; Eduardo Cesar Meurer

Students using mass spectrometry to check if the oils were adulterated with soybean oil. An investigative approach to learning mass spectrometry and other fundamental concepts of chemistry.

http://dx.doi.org/10.21577/0100-4042.20170256

Publicado online: junho 28, 2018
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O ESPAÇO DA QUÍMICA NOS CENTROS E MUSEUS DE CIÊNCIAS BRASILEIROS

Ana C. da S. Steola; Ana C. Kasseboehmer

In this article we discuss the space of Chemistry in Brazilian science centers and museums through a documental survey conducted by telephone, mail and analyzing the websites of those places.

http://dx.doi.org/10.21577/0100-4042.20170248

Publicado online: junho 7, 2018
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AN APPROACH TO THE KINETICS AND THERMODYNAMICS OF ELEMENTARY CHEMICAL REACTIONS USING A STOCHASTIC MODEL

Francis Pereira Nascimento; Baraquízio Braga do Nascimento Junior; Luiz Augusto Martins Cardoso; Rodrigo Veiga Tenório de Albuquerque; Nemesio Matos Oliveira-Neto

Top Figure: Potential energy for A ⇆ B reaction. Bottom Left Figure: Transitions between states A and B. (i) Ehrenfest urn model (Urns A and B) randomly defines the collision between molecules; (ii) Monte Carlo method (PAB and PPBA: Metropolis Update) defines the transition probabilities. Bottom Right Figure: A tipical results for 102 samples.

http://dx.doi.org/10.21577/0100-4042.20170241

Publicado online: maio 22, 2018
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