JBCS



14:18, seg mai 25

Edição Atual vol. 38, No. 4, 2015, p. 459-603



Artigo de Capa
Quim. Nova 2015, 38(4), 538-552

CURCUMINA, O PÓ DOURADO DO AÇAFRÃO-DA-TERRA: INTROSPECÇÕES SOBRE QUÍMICA E ATIVIDADES BIOLÓGICAS

Vitor Sueth-Santiago; Gustavo Peron Mendes-Silva; Débora Decoté-Ricardo; Marco Edilson Freire de Lima

Curcumin, isolated from the dried rhizomes of Curcuma longa (Zingiberaceae), is a golden colored derivative present in turmeric. Since its structural elucidation, several studies have been published on the biological activities exhibited by curcumin, particularly its chemotherapeutic properties.

http://dx.doi.org/10.5935/0100-4042.20150035

Publicado online: março 5, 2015
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Artigos Quim. Nova 2015, 38(4), 459-465

 

SYNGAS PRODUCTION FROM CO2-REFORMING OF CH4 OVER SOL-GEL SYNTHESIZED Ni-Co/Al2O3-MgO-ZrO2 NANOCATALYST: EFFECT OF ZrO2 PRECURSOR ON CATALYST PROPERTIES AND PERFORMANCE

Seyed Mehdi Sajjadi; Mohammad Haghighi; Farhad Rahmani


Effect of ZrO2 precursor on product yield at different temperatures.

http://dx.doi.org/10.5935/0100-4042.20150034

Publicado online: março 5, 2015
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Quim. Nova 2015, 38(4), 466-470

 

APPLICATION OF SULFONIC ACID FUNCTIONALIZED NANOPOROUS SILICA (SBA-Pr-SO3H) FOR THE PREPARATION OF 4,6-DIARYLPYRIMIDIN-2(1H)-ONES

Ghodsi Mohammadi Ziarani; Masoumeh Azizi; Parvin Hajiabbasi; Alireza Badiei


The Biginelli-type reaction between various aldehydes, acetophenones and urea in the presence of sulfonic acid functionalized silica (SBA-Pr-SO3H) under solvent-free conditions produced 4,6-diarylpyrimidin-2(1H)-ones derivatives at good yields.

http://dx.doi.org/10.5935/0100-4042.20150033

Publicado online: março 5, 2015
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Quim. Nova 2015, 38(4), 471-477

 

AVALIAÇÃO DAS NORMAS DE ENSAIO APLICADAS NA QUANTIFICAÇÃO DE PCBs EM ÓLEO ISOLANTE

Kassia dos Santos; Heloisa N. da Motta; Erick Amaral Campos; Joseane V. Gulmine; Marilda Munaro


This work identified the inefficiency in the analytical methods presented in standards ABNT NBR 13882 and IEC 61619 in the insulating oil analysis, and highlights potential failures that generated discrepancies on quantification of polychlorinated biphenyls (PCBs).

http://dx.doi.org/10.5935/0100-4042.20150032

Publicado online: março 5, 2015
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Quim. Nova 2015, 38(4), 478-482

 

ISOLATION AND CHARACTERIZATION OF NANOFIBRILLATED CELLULOSE FROM OAT HULLS

Giovanni B. Paschoal; Carmen M. O. Muller; Gizilene M. Carvalho; Cesar A. Tischer; Suzana Mali


Raw oat hulls were bleached with peracetic acid and then submitted to acid hydrolysis resulting in nanofibrillated cellulose, which showed an aspect of interconnected webs of tiny nanofibers with diameters of 70-100 nm and lengths of several micrometers.

http://dx.doi.org/10.5935/0100-4042.20150029

Publicado online: março 5, 2015
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Quim. Nova 2015, 38(4), 483-487

 

Zingiber officinale (GENGIBRE) COMO FONTE ENZIMÁTICA NA REDUÇÃO DE COMPOSTOS CARBONÍLICOS

Leonardo A. Alves; Luciana M. Bertini; Ayla Márcia C. Bizerra; Marcos Carlos de Mattos; Francisco José Q. Monte; Telma L. G. Lemos


Several vegetables were evaluated as biocatalysts for the reduction of ketones. Z. officinale presented the best results with the formation of an alcohol configuration.

http://dx.doi.org/10.5935/0100-4042.20150028

Publicado online: março 5, 2015
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Quim. Nova 2015, 38(4), 488-492

 

PARÂMETROS TERMODINÂMICOS DA CASCA DE LARANJA DESIDRATADA

Carolina M. Santos; Leandro Cardoso de Morais


The thermodynamic parameters obtained by thermogravimetry in inert and oxidizing atmosphere of dry orange peel were analyzed and compared in order to generate data for the discussion of potential applications of this material as a biofuel.

http://dx.doi.org/10.5935/0100-4042.20150026

Publicado online: março 5, 2015
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Quim. Nova 2015, 38(4), 493-497

 

RAPID AND SENSITIVE DETERMINATION OF PALLADIUM USING HOMOGENEOUS LIQUID-LIQUID MICROEXTRACTION VIA FLOTATION ASSISTANCE FOLLOWED BY GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY

Mohammad Rezaee; Reyhaneh Shadaniyan; Majid Haji Hosseini; Faezeh Khalilian


A method for the determination of trace amounts of palladium was developed using homogeneous liquid-liquid microextraction via flotation assistance followed by graphite furnace atomic absorption spectrometry.

http://dx.doi.org/10.5935/0100-4042.20150036

Publicado online: março 23, 2015
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Quim. Nova 2015, 38(4), 498-505

 

ANÁLISE COMPARATIVA DO CONTEÚDO EM ESTEROIDES LIVRES DE DIFERENTES ÓLEOS, GORDURAS E BIODIESEIS POR CROMATOGRAFIA GASOSA

Kelly da S. Bezerra; Nelson R. Antoniosi Filho


The content from the unsaponifiable fraction of different fats and oils used as feedstock for biodiesel production was determined. The separation and identification of free steroid present in these samples was performed by gas chromatography.

http://dx.doi.org/10.5935/0100-4042.20150037

Publicado online: março 23, 2015
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Quim. Nova 2015, 38(4), 506-509

 

METHANE DRY REFORMING OVER Ni SUPPORTED ON PINE SAWDUST ACTIVATED CARBON: EFFECTS OF SUPPORT SURFACE PROPERTIES AND METAL LOADING

Rafael García; Gabriela Soto; Néstor Escalona; Catherine Sepúlveda; María José Orellana; Natalia Morales; Ljubisa R. Radovic; Robison Buitrago-Sierra; Francisco Rodriguez-Reinoso; Antonio Sepúlveda-Escribano


The lower diversity and concentration of oxygenated surface functional groups in the PSAC-He support led to higher methane conversion on Ni pine sawdust activated carbon catalyst, due to their high Ni dispersion.

http://dx.doi.org/10.5935/0100-4042.20150058

Publicado online: abril 14, 2015
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Quim. Nova 2015, 38(4), 510-517

 

PREDICTING THE BOILING POINT OF PCDD/Fs BY THE QSPR METHOD BASED ON THE MOLECULAR DISTANCE-EDGE VECTOR INDEX

Long Jiao; Xiaofei Wang; Shan Bing; Zhiwei Xue; Hua Li


A QSPR study on the boiling point of PCDD/Fs based on the molecular distanceedge vector index was conducted. The boiling point of each PCDD/F congener was predicted by the established QSPR model.

http://dx.doi.org/10.5935/0100-4042.20150025

Publicado online: março 5, 2015
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Quim. Nova 2015, 38(4), 518-525

 

TUNGSTOPHOSPHORIC ACID HETEROGENIZED ONTO NH4ZSM5 AS AN EFFICIENT AND RECYCLABLE CATALYST FOR THE PHOTOCATALYTIC DEGRADATION OF DYES

Candelaria Leal Marchena; Silvina Gomez; Clara Saux; Liliana B. Pierella; Luis R. Pizzio


TPA immobilized over NH4ZSM5 zeolites were prepared by wet impregnation. Eg values of NH4ZSM5TPA samples were similar to those reported for TiO2 and irradiated NH4ZSM5TPA samples efficiently degraded methyl orange solutions.

http://dx.doi.org/10.5935/0100-4042.20150024

Publicado online: março 5, 2015
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Quim. Nova 2015, 38(4), 526-532

 

APROVEITAMENTO DE RESÍDUO DE BIODIESEL PARA PREPARAÇÃO DE CARVÕES ÁCIDOS COM ELEVADA ATIVIDADE CATALÍTICA NA REAÇÃO DE ETERIFICAÇÃO DO GLICEROL

Michelle Mantovani; Erik Moda Aguiar; Wagner Alves Carvalho; Dalmo Mandelli; Maraisa Gonçalves


Preparation of acid carbon from glycerin waste and its utilization as a catalyst for the production of oxygenated products from the etherification reaction.

http://dx.doi.org/10.5935/0100-4042.20150023

Publicado online: março 5, 2015
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Quim. Nova 2015, 38(4), 533-537

 

ADAPTAÇÃO DA METODOLOGIA DE ANÁLISE DE METEMOGLOBINA COMO BIOMARCADOR DE EFEITO DA EXPOSIÇÃO AO AGROTÓXICO DIFLUBENZURON

Cristiane Barata-Silva; Tatyane P. dos Santos; Adherlene V. Gouvêa; Ariane L. Larentis; Josino C. Moreira; Paula N. Sarcinelli


This work aimed to adapt the analysis of methemoglobin recommended by Evelyn - Malloy (visible spectrophotometry), in order to facilitate its application in the field, or to analysis in clinical laboratory, of existing sites of diflubenzuron application.

http://dx.doi.org/10.5935/0100-4042.20150038

Publicado online: março 23, 2015
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Revisão Quim. Nova 2015, 38(4), 553-560

 

COMUNICAÇÃO CIENTÍFICA NO ENSINO SUPERIOR DE QUÍMICA: UMA REVISÃO

Jane Raquel Silva de Oliveira; Salete Linhares Queiroz


The importance and value of teaching scientific communication skills in undergraduate chemistry courses.

http://dx.doi.org/10.5935/0100-4042.20150019

Publicado online: março 3, 2015
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Nota Técnica Quim. Nova 2015, 38(4), 563-569

 

DETERMINAÇÃO DO TEOR DE BIODIESEL EM DIESEL EMPREGANDO O ENSAIO COLORIMÉTRICO DO ÁCIDO HIDROXÂMICO

Roberta P. M. da Costa; Thaiane C. Khalil; Amanda P. F. dos Santos; Débora F. de Andrade; Luiz A. d'Avila


Color scale sample of biodiesel in diesel (B0 to B6), obtained by colorimetric assay for hydroxamic acid.

http://dx.doi.org/10.5935/0100-4042.20150039

Publicado online: março 23, 2015
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Quim. Nova 2015, 38(4), 570-574

 

EXTRAÇÃO ASSISTIDA POR ULTRASSOM PARA DETERMINAÇÃO COLORIMÉTRICA DE FERRO EM SOLO: UMA COMPARAÇÃO COM ESPECTROMETRIA DE MASSA COM PLASMA INDUTIVAMENTE ACOPLADO

Paula Cristiana de Freitas; Rui Miguel de Carvalho; Jessee Severo Azevedo Silva; Thiago Prado; Elis Regina Duarte; Vera L. A. Frescura; Eduardo S. Chaves


Ultrasound-assisted extraction and iron colorimetric determination in soils: A comparison with ICP-MS.

http://dx.doi.org/10.5935/0100-4042.20150021

Publicado online: março 3, 2015
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Quim. Nova 2015, 38(4), 575-579

 

CHEMOSTAT, UM SOFTWARE GRATUITO PARA ANÁLISE EXPLORATÓRIA DE DADOS MULTIVARIADOS

Gilson A. Helfer; Fernanda Bock; Luciano Marder; João C. Furtado; Adilson B. da Costa; Marco F. Ferrão


Chemostat: free exploratory multivariate data analysis software and web tool.

http://dx.doi.org/10.5935/0100-4042.20150063

Publicado online: abril 14, 2015
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Educação Quim. Nova 2015, 38(4), 580-587

 

ANÁLISE DA ABORDAGEM HISTÓRICA PARA A TABELA PERIÓDICA EM LIVROS DE QUÍMICA GERAL PARA O ENSINO SUPERIOR USADOS NO BRASIL NO SÉCULO XX

Helena S. A. Leite; Paulo A. Porto


In the twentieth century, the periodic table was presented in general chemistry textbooks in different ways: from more descriptive approaches to emphasis on attempts to explain the periodic table in terms of atomic orbitals.

http://dx.doi.org/10.5935/0100-4042.20150064

Publicado online: abril 14, 2015
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Quim. Nova 2015, 38(4), 588-594

 

BIOORGANIC CONCEPTS INVOLVED IN THE DETERMINATION OF GLUCOSE, CHOLESTEROL AND TRIGLYCERIDES IN PLASMA USING THE ENZYMATIC COLORIMETRIC METHOD

Fabrício G. Menezes; Ana C. O. Neves; Djalan F. de Lima; Sheeza D. Lourenço; Lilian C. da Silva; Kássio M. G. de Lima


A proposal based on biochemical analyses by the enzymatic colorimetric method was found to be highly motivating for undergraduates because of the multidisciplinary theoretical context involved and the possibility of experimental activity.

http://dx.doi.org/10.5935/0100-4042.20150040

Publicado online: março 23, 2015
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Quim. Nova 2015, 38(4), 595-598

 

INNOVATIVE USE OF A TABLET DEVICE TO DELIVER INSTRUCTION IN UNDERGRADUATE CHEMISTRY LECTURES

Gonzalo A. Jaña; Wilson Cardona; Verónica A. Jiménez


A tablet device was used to project digitally handwritten annotations to deliver instruction in undergraduate chemistry lectures.

http://dx.doi.org/10.5935/0100-4042.20150041

Publicado online: março 23, 2015
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Assuntos Gerais Quim. Nova 2015, 38(4), 599-603

 

THE ROLE OF NANOMATERIALS IN COSMETICS: NATIONAL AND INTERNATIONAL LEGISLATIVE ASPECTS

Adriana Melo; Marcela Seragiotto Amadeu; Marcelo Lancellotti; Luciana Maria de Hollanda; Daisy Machado


http://dx.doi.org/10.5935/0100-4042.20150042

Publicado online: março 23, 2015
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