JBCS



2:55, qua jan 16








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

DESTILAÇÃO ATMOSFÉRICA DO BIODIESEL DERIVADO DO ÓLEO DE MACAÚBA OU DO PALMISTE PARA OBTENÇÃO DA FRAÇÃO DE ÉSTERES LEVES PARA USO COMO COMBUSTÍVEL DE AVIAÇÃO

Luiz Vitor Leonardi Harter; Douglas Queiroz Santos; José Domingos Fabris

The point to carry out the distillation cut is between fraction 05 and 06, because in fraction 06 the content of C12 decreases and that of C18 increases. Thus, the distillate would be between 50 and 60% of the total biodiesel used in distillation.

http://dx.doi.org/10.21577/0100-4042.20170320

Publicado online: dezembro 20, 2018
PDF

ISOLATION OF ANTIFUNGAL QUINOID DERIVATIVES FROM LEAVES OF Pentacalia desiderabilis (Vell.) Cuatre. (Asteraceae) USING IONIC LIQUID IN THE MICROWAVE ASSISTED EXTRACTION

Kaio de S. Gomes; Cinthia I. Tamayose; Marcelo José P. Ferreira; Cynthia Murakami; Maria Claudia M. Young; Guilherme M. Antar; Fernanda F. Camilo; Patricia Sartorelli; João Henrique G. Lago

Leaves of Pentacalia desiderabilis (Asteraceae) were extracted using BMImBr and H2O in a MAE system. Partition with CH2Cl2 and fractionation of organic phase afforded four related quinoids (1 - 4). Compounds 1 - 3 displayed activity against Cladosporium sp.

http://dx.doi.org/10.21577/0100-4042.20170319

Publicado online: dezembro 20, 2018
PDF Informação suplementar

MOLECULE DESIGN AND PROPERTIES OF CYCLIC ENERGETIC MATERIALS BASED ON NITROGUANIDINE AND 1,1-DIAMINO-2,2-DINITROETHENE

Xiao Menghui; Jin Xinghui; Zhou Jianhua; Hu Bingcheng

A series of nitroguanidine and 1,1-diamino-2,2-dinitroethene based cyclic energetic materials were designed and their electronic structures, detonation properties and thermal stabilities were fully investigate by density functional theory (DFT).

http://dx.doi.org/10.21577/0100-4042.20170317

Publicado online: dezembro 17, 2018
PDF

UM ESTUDO CINÉTICO SOBRE A INFLUÊNCIA DE MEDIADORES FENÓLICOS NA DESCOLORAÇÃO DE DIFERENTES CORANTES POR SISTEMAS FENTON

Cássia Sidney Santana; Camila Cristina Vieira Velloso; André Aguiar

The presence of the phenolic mediator, 3,4-dihydroxyphenylacetic acid, increased the reaction rate to the phenol red decolorization by a Fenton system.

http://dx.doi.org/10.21577/0100-4042.20170316

Publicado online: dezembro 6, 2018
PDF

PRÉ-CONCENTRAÇÃO BASEADA NA COPRECIPITAÇÃO USANDO CROMATO DE PRATA COMO CARREADOR PARA DETERMINAÇÃO DE COBRE POR FAAS

Ivero P. Sá; Luana N. Santos; Erik G. P. da Silva; Daniel de C. Lima; Fábio Alan C. Amorim

• Multivariate optimization of analytical methods.
• Silver chromate as coprecipitant copper separation and preconcentration.
• Determination of copper in water samples by FAAS.

http://dx.doi.org/10.21577/0100-4042.20170314

Publicado online: novembro 29, 2018
PDF

SYNTHESIS, ELECTRONIC AND SPECTRAL PROPERTIES OF NEW 1,3,4-THIADIAZOLE COMPOUNDS AND THE SPECTRAL ANALYSIS OF THEIR CONFORMERS USING DENSITY FUNCTIONAL THEORY

Muhammet Serdar Çavuş; Tuğba Çelik

Analysis of the correlation between electronic and spectral data of the conformers of new 1,3,4-thiadiazole compounds.

http://dx.doi.org/10.21577/0100-4042.20170315

Publicado online: novembro 29, 2018
PDF Informação suplementar

COMPOSIÇÃO QUÍMICA E ATIVIDADE ANTILEISHMANIA DE Tocoyena hispidula

Elcilene A. de Sousa; Amauri Porto A. Rosa; Rodolfo Ritchelle L. dos Santos; Ingredy L. dos Santos; Valéria C. de Sousa; Fernando Aécio de A. Carvalho; Gerardo M. Vieira Júnior; Mariana H. Chaves

Phytochemical study of the CHCl3 fraction from EtOH extract of T. hispidula stem led to the isolation of six pure compounds and four mixtures, predominantly triterpenoids and steroids. The CHCl3 and EtOAc fractions were the most active against Leishmania major promastigotes.

http://dx.doi.org/10.21577/0100-4042.20170313

Publicado online: novembro 28, 2018
PDF Informação suplementar

POSTSYNTHESIS OF TITANIUM INCORPORATED WITH AMINO-FUNCTIONALIZATION UIO-66 FOR ENHANCING CO2 UPTAKE

Jinlong Ge; Zhong Wu; Qiuqin Wang; Shanshan Yang

Titanium cooperated with NH2-UiO-66 has been prepared via post synthesis modifications approach and perform enhanced CO2 uptake application due to their unprecedented capacity to store small molecules.

http://dx.doi.org/10.21577/0100-4042.20170312

Publicado online: novembro 28, 2018
PDF

SYNTHESIS AND NUCLEAR MAGNETIC RELAXATION PROPERTIES OF COMPOSITE IRON OXIDE NANOPARTICLES

Elisa M. N. de Oliveira; Maximiliano S. da Rocha; Ana Paula P. Froner; Nara R. S. Basso; Mara L. Zanini; Ricardo M. Papaléo

We describe a biocompatible nanoparticle system with a magnetic core coated with dextran. The coating was also crosslinked, grafted with amino groups and conjugated with a fluorophore, allowing magnetic resonance contrast action.

http://dx.doi.org/10.21577/0100-4042.20170309

Publicado online: novembro 14, 2018
PDF

FIGURES OF MERIT EVALUATION OF GC/MS METHOD FOR QUANTIFICATION OF 2-PHENOXYETHANOL FROM BALLPOINT PEN INK LINES AND DETERMINATION OF THE INFLUENCE OF SUPPORT PAPER ON SOLVENT EXTRACTION

Carina Maria Bello de Carvalho; Rafael Scorsatto Ortiz; Renata Pereira Limberger

The ballpoint pen ink ageing can be used to date questioned documents. One way to evaluate the ageing is the quantification of volatile components as 2-phenoxyethanol. This paper concerned about GC/MS method evaluation of merit figures and the influence of different kinds of paper sheets in the quantification of 2-phenoxyetanol, using Full Factorial Design.

http://dx.doi.org/10.21577/0100-4042.20170308

Publicado online: novembro 12, 2018
PDF

COMPOSIÇÃO QUÍMICA, ATIVIDADE ANTIRADICALAR E ANTIMICROBIANA DO PÓLEN APÍCOLA DE FABACEAE

Francisco R. L. Caldas; Francisco Augusto Filho; Heberty T. Facundo; Rodolfo F. Alves; Francisco de A. R. dos Santos; Girliane R. da Silva; Celso A. Camara; Tania M. S. Silva

The bees Apis mellifera visit species of Fabaceae. Pollen is acquired in hives and palynological analysis shows the botanical pollen types. The chemical constituents for the Fabaceae pollen bee were identified.

http://dx.doi.org/10.21577/0100-4042.20170305

Publicado online: novembro 7, 2018
PDF

CHEMICAL PROFILES OF ESSENTIAL OILS AND FATTY ACIDS FROM Erythrina velutina

Margareth G. Teixeira; Marcílio M. de Moraes; Claudio A. G. da Camara

Erythina velutina occurs with chromatic variations in its seeds and flowers on Fernando de Noronha Island. Chemical analysis revealed significant differences in the chemical profile of the essential oils between the red and orange flowers, whereas the fatty acid profile of the red and black seeds was similar.

http://dx.doi.org/10.21577/0100-4042.20170304

Publicado online: novembro 7, 2018
PDF Informação suplementar

DEVELOPMENT OF CLOUD POINT EXTRACTION-SCANOMETRY, FOR THE PRECONCENTRATION AND DETERMINATION OF COLORLESS SPECIES: APPLICATION FOR THE DETERMINATION OF PHENYLALANINE

Ardeshir Shokrollahi; Masuod Refahi

CPE-scanometry is applied for the determination of Phenylalanine amino acid. The extracted phase was diluted with alkali ethanol and transfered to a special cell. The cells containing the analyte solution were scanned with a scanner, then the color of each cell was analyzed, by software written in Visual Basic (VB 6), to obtain the red, green and blue values.

http://dx.doi.org/10.21577/0100-4042.20170303

Publicado online: novembro 7, 2018
PDF

EQUAÇÕES LINEARES E NÃO LINEARES PARA PREVER O COMPORTAMENTO DE PROPRIEDADES FÍSICO-QUÍMICAS DE COMBUSTÍVEL DE AVIAÇÃO MISTURADO COM BIOQUEROSENE DROP-IN ALTERNATIVO

Bruno K. V. Iha; Leila Ribeiro dos Santos; Lenilson Afonso dos Santos; Maria Esther Sbampato; José A. F. F. Rocco

The graph shown in the figure is inserted in the context of the article, the graph represents the path traveled by green aircraft that cares about the environment, driven by a drop-in biofuel. The aircraft is crossing a sea of biokerosene.

http://dx.doi.org/10.21577/0100-4042.20170302

Publicado online: outubro 31, 2018
PDF Informação suplementar

AVALIAÇÃO ESPACIAL E SAZONAL DAS CONCENTRAÇÕES DE PARTÍCULAS TOTAIS EM SUSPENSÃO E ELEMENTOS METÁLICOS ASSOCIADOS NO AR DE UMA CIDADE DO SUDESTE BRASILEIRO

Gabriel P. Machado; Renato I. S. Alves; Ana Paula M. S. Senhuk; Brisa M. Fregonesi; Guilherme S. Zagui; Martí Nadal; Jordi Sierra; Josep L. Domingo; Susana I. Segura-Muñoz

This study evaluated the concentrations of TSP and metals in the air of Ribeirão Preto city. Spatial differences were found between some metals, but seasonal differences were found between TSP and the most of the elements.

http://dx.doi.org/10.21577/0100-4042.20170297

Publicado online: outubro 17, 2018
PDF Informação suplementar

THEORETICAL STUDIES ON TRIACETONETRIPEROXIDE (TATP) DERIVATIVES TO IMPROVE THEIR PERFORMANCE

Zongcheng Miao; Faan Li; Yi Luan

Stability and detonation performance of derivatives of Triacetonetriperoxide were investigated. Results show that TATPNO2 is a candidate of novel high energy density materials.

http://dx.doi.org/10.21577/0100-4042.20170295

Publicado online: setembro 27, 2018
PDF Informação suplementar

DETERMINATION OF ANTIOXIDANT POTENTIAL AND QUANTITATION OF PHENOLIC COMPOUNDS BY HPLC IN ACCESSION OF Capsicum baccatum var. pendulum

Maria Lucy de Assis; Marco Antônio G. B. Gomes; Larissa L. da Cruz; Michel de S. Passos; Silvia M. F. Pereira; Mariana B. S. Arantes; Daniela B. Oliveira; Ivo J. C.Vieira

Compounds from the ethanolic extract of pepper fruit Capsicum baccatum var. pendulum identified by High-Performance Liquid Chromatography (HPLC).

http://dx.doi.org/10.21577/0100-4042.20170294

Publicado online: setembro 27, 2018
PDF Informação suplementar

Revisão

NANOTOXICOLOGIA DE NANOPARTÍCULAS DE PRATA: TOXICIDADE EM ANIMAIS E HUMANOS

Nelson Durán; Wallace R. Rolim; Marcela Durán; Wagner J. Fávaro; Amedea B. Seabra

This review presents a critical view of the toxic effects of silver nanoparticles (Ag NPs) on in vitro and in vivo biological models.

http://dx.doi.org/10.21577/0100-4042.20170318

Publicado online: dezembro 17, 2018
PDF

AVANÇOS RECENTES EM BIOSSÍNTESE COMBINATÓRIA DE POLICETÍDEOS: PERSPECTIVAS E DESAFIOS

Bruno S. Paulo; Renata Sigrist; Luciana G. de Oliveira

Prospects in genetic engineering of enzymes, modules and domains from polyketides megasynthases results in structural diversity on natural products.

http://dx.doi.org/10.21577/0100-4042.20170307

Publicado online: novembro 7, 2018
PDF

Nota Técnica

AVALIAÇÃO DE DIFERENTES MÉTODOS DE EXTRAÇÃO PARA A IDENTIFICAÇÃO DE RESÍDUOS DE MACROLÍDEOS EM ALIMENTOS INFANTIS INDUSTRIALIZADOS À BASE DE CARNE POR CROMATOGRAFIA A LÍQUIDO ACOPLADA À ESPECTROMETRIA DE MASSAS SEQUENCIAL (LC-MS/MS)

Jônatas V. Grutes; Rosana G. Ferreira; Mychelle A. Monteiro; Mararlene U. Pereira; Bernardete F. Spisso

This study compared eight simple methods for identification of macrolides residues in canned baby food and an effective extraction method was achieved, using QuEChERS procedure for sample preparation.

http://dx.doi.org/10.21577/0100-4042.20170306

Publicado online: novembro 7, 2018
PDF

ARTIFACTS IN THE ANALYSIS AND ASSESSMENT OF LOW-COST CONTAINERS FOR SAMPLING AND STORING GREENHOUSE GASES

Rafael C. Abruzzi; Beatriz Bonetti; Marçal J.R. Pires; Berenice. A. Dedavid; Arthur K. Bitencourt

Methanator-GC-FID analysis of low level of CO in presence of O2 need meticulous evaluation. Sample stability and container reusability indicated borosilicate flask with butyl rubber and PTFE/silicone septa sampler as more appropriate for storing GHG and CO samples.

http://dx.doi.org/10.21577/0100-4042.20170299

Publicado online: outubro 22, 2018
PDF Informação suplementar

METODOLOGIA PARA DETECÇÃO ELETROQUÍMICA QUALITATIVA DE COMPOSTOS ORGÂNICOS EM INTERFACES PETRÓLEO/ÁGUA

Roberval A. Silva; Rejane M. P. Silva; Keyla T. Santos; Tatiana S. Araujo; Alexandre C. Alcântara; Hugo B. Suffredini

Experimental scheme of the detection of petroleum using oil/water interfaces with an electrochemical approach.

http://dx.doi.org/10.21577/0100-4042.20170298

Publicado online: outubro 22, 2018
PDF

Educação

LA PERIODICIDAD DE LOS ELEMENTOS Y EL DESEMPEÑO DE LOS MATERIALES: UN COMPLEMENTO PARA LA COMPRENSIÓN DE LA TABLA PERIÓDICA

Virginia E. Noval; José G. Carriazo

The United Nations has proclaimed 2019 as the International Year of the Periodic Table of Chemical Elements. For that reason, it is considered pertinent to highlight the importance of the periodic system in the scientific and technological development of the chemistry.

http://dx.doi.org/10.21577/0100-4042.20170321

Publicado online: janeiro 14, 2019
PDF

VALIDAÇÃO DE MÉTODO ESPECTROFOTOMÉTRICO DE ANÁLISE PARA A QUANTIFICAÇÃO DE ÁCIDO ACETILSALICÍLICO EM FORMULAÇÕES FARMACÊUTICAS: UMA PROPOSTA DE AULA EXPERIMENTAL PARA ANÁLISE INSTRUMENTAL

Enock José A. Goes Junior; Jakson S. Roeder; Kaiky B. L. Oliveira; Mateus P. Ferreira; Jonatas G. da Silva

Validation of a simple, precise, accurate, rapid and low-cost UV spectrophotometric method for quantification of acetylsalicylic acid in pharmaceutical formulations for experimental activities on teaching laboratories.

http://dx.doi.org/10.21577/0100-4042.20170300

Publicado online: outubro 29, 2018
PDF Informação suplementar

Assuntos Gerais

ENTRE TIPOS E RADICAIS: A CONSTRUÇÃO DO CONCEITO DE VALÊNCIA

Helena S. Alvares Nogueira; Paulo Alves Porto

Theory of valence resulted from the amalgamation of earlier theories of radicals and types, and was connected with the development of several fundamental aspects of chemistry, such as structural theory, chemical bonding and the periodic table.

http://dx.doi.org/10.21577/0100-4042.20170311

Publicado online: novembro 28, 2018
PDF

O CONCEITO DE VALÊNCIA EM LIVROS DIDÁTICOS DE QUÍMICA GERAL ENTRE AS DÉCADAS DE 1890 E 1940

Helena S. Alvares Nogueira; Paulo Alves Porto

In the first decades of the 20th century, general chemistry textbooks presented the concept of valence in different ways, from classical approaches to the electronic model. Didactic models might include even an analogy with hooks holding atoms together.

http://dx.doi.org/10.21577/0100-4042.20170310

Publicado online: novembro 28, 2018
PDF

A BUSCA POR CHUMBO E PRATA EM MINAS GERAIS COMO ALTERNATIVA ÀS ESGOTADAS MINAS DE OURO E DIAMANTES NO SÉCULO XIX

Luciano E. Faria; Carlos A. L. Filgueiras

Silver bar (front and rear) obtained by the Baron of Eschwege in 1812 from the argentiferous galena (PbS) of the Rio Abaeté sertões - MG.

http://dx.doi.org/10.21577/0100-4042.20170301

Publicado online: outubro 31, 2018
PDF

On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
Química Nova
Publicações da Sociedade Brasileira de Química
Caixa Postal: 26037 05513-970 São Paulo - SP
Tel/Fax: +55.11.3032.2299/+55.11.3814.3602
Free access

GN1