JBCS



21:40, seg fev 17

Acesso Aberto/TP



vol. 43, No. 7, 2020



Artigo de Capa
Quim. Nova 2020, 43(7), 928-950

Synergisms between metal and photoredox catalysis: deconvoluting complex systems

Alessandra A. G. Fernandes; Igor D. Jurberg*

Reactivity principles and representative examples are presented and explained in the field of metal catalysis merged with photoredox catalysis. In this context, powerful cross-coupling strategies arise.

http://dx.doi.org/10.21577/0100-4042.20170534

Publicado online: abril 22, 2020
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Total access: 1950

Artigo Quim. Nova 2020, 43(7), 837-843

 

Electrical noises reduction in nanopores experiments based on consensus filter

Bingyong YanI; Haixu CuiI,*; Jiale ZhouII; Huifeng WangI


Construct a 16-channel network of current signals generated by nanopore sequencing to perform consensus filter to reduce electrical noises from the original signal.

http://dx.doi.org/10.21577/0100-4042.20170560

Publicado online: junho 4, 2020
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Quim. Nova 2020, 43(7), 844-850

 

Limonene quantification by gas chromatography with mass spectrometry (GC-MS) and its effects on hydrogen and volatile fatty acids production in anaerobic reactors

Franciele Pereira CamargoI,*; Arnaldo SartiII,III; Alberto Camilo AlécioII,III; Carolina Aparecida SabatiniI; Maria Angela Tallarico AdornoI; Iolanda Cristina Silveira DuarteIV; Maria Bernadete Amâncio VarescheI


After batch assays with increasing concentrations of limonene (without limonene addition to 2000 mg L-1), an inhibition effect was observed at H2 and HAc production at high concentrations of limonene. The developed method allowed the determination of limonene in anaerobic reactors.

http://dx.doi.org/10.21577/0100-4042.20170557

Publicado online: maio 29, 2020
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Total access: 1373

Quim. Nova 2020, 43(7), 851-855

 

Characterization of interaction between buddleoside and bovine serum albumin

Shan Sun; Zhe Yuan; Yuanqi Lu*


The different analytical techniques mutually confirmed the strong binding force between buddleoside and bovine serum albumin, which can provide a theoretical basis for the subsequent pharmacokinetic studies of buddleoside.

http://dx.doi.org/10.21577/0100-4042.20170568

Publicado online: junho 12, 2020
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Total access: 697

Quim. Nova 2020, 43(7), 856-862

 

Theoretical understanding of morphological distribution of hydrogen in amorphous calcium silicate hydrate

Chongsong ZhouI,*; Lilin LuII


A new C-S-H model originated from random stacking of atoms was used to understand the coordination state of hydrogen in C-S-H and the chemical structure formula of C-S-H.

http://dx.doi.org/10.21577/0100-4042.20170569

Publicado online: junho 12, 2020
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Total access: 1081

Quim. Nova 2020, 43(7), 863-869

 

Regressão multivariada por OPLS e PLS dos espectros de RMN de 1H de misturas diesel/biodiesel de mafurra para estimativa do teor de biodiesel

Ademar D. V. MáquinaI,II*; Baltazar V. SitoeI,II; Maria T. C. FerreiraI; Douglas Q. SantosIII; Waldomiro Borges NetoI


Samples of diesel mixed with mafurra biodiesel, spectra of the samples, multivariate calibration by PLS, orthogonal correction to develop the OPLS model.

http://dx.doi.org/10.21577/0100-4042.20170559

Publicado online: maio 29, 2020
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Total access: 979

Quim. Nova 2020, 43(7), 870-877

 

Impactos dos BTEX em áreas urbanas da cidade do Rio de Janeiro

Josie Batista Bastos CarvalhoI*; Júlio Domingos Nunes FortesI; Sergio Machado CorrêaII; Eduardo Monteiro MartinsI


BTEX found in the urban areas of the city of Rio de Janeiro, originating from vehicular and evaporative emissions.

http://dx.doi.org/10.21577/0100-4042.20170562

Publicado online: junho 10, 2020
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Total access: 1439

Quim. Nova 2020, 43(7), 878-883

 

Caracterização e controle de qualidade de óleos de copaíba (Copaifera sp.) utilizando detecção de marcadores por fator de retenção relativa em HPTLC

Milena C. F. de LimaI; Samir F. de Almeida CavalcanteII; Larissa S. M. WiedemannI; Valdir F. da Veiga JuniorI,III*


Sesquiterpenes and diterpenic acids, biomarkers from Copaiba oils (Copaifera sp.), were detected by a fast and reliable method using retention factor (Rf) relative to linalool oxide at High Performance Thin Layer Chromatography (HPTLC).

http://dx.doi.org/10.21577/0100-4042.20170563

Publicado online: junho 10, 2020
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Total access: 1365

Quim. Nova 2020, 43(7), 884-890

 

Contribution of enzymatic method for analyzing sucrose and starch in traditional Chinese lime- and earth-based mortars

Kun ZhangI,*; Shiqiang FangII; Xin MaoIII; Bingjian ZhangII,IV


Chemical analyses, enzymatic analyses, FTIR and SEM were performed to identify sucrose and starch in both lab-prepared mortar specimens and historic mortar samples.

http://dx.doi.org/10.21577/0100-4042.20170561

Publicado online: junho 4, 2020
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Total access: 1136

Quim. Nova 2020, 43(7), 891-900

 

Determinação da autenticidade de amostras de azeite comerciais apreendidas no estado do Espírito Santo usando um espectrofotômetro portátil na região do NIR

Priscilla C. SantosI, Flavia TosatoII, Mirelly CesconettoI, Thayná CorrêaI, Francine D. SantosII, Valdemar Lacerda Jr.II, André A. PiresI, Araceli V. F. N. RibeiroI, Paulo R. FilgueirasII,# e Wanderson RomãoI,II,III*


This work used the portable NIR associated with chemometric tools (PCA and PLS) as well as physical-chemical analyzes, to determine the quality and authenticity of 60 commercial olive oil samples which were seized in different establishments in the state of Espírito Santo.

http://dx.doi.org/10.21577/0100-4042.20170550

Publicado online: maio 19, 2020
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Total access: 2673

Quim. Nova 2020, 43(7), 901-908

 

Synthesis and phytotoxic profile of a new tetraoxane designed from a commercial auxin

Isabel V. AntolínezI; Luiz C. A. BarbosaI,II*; Célia R. A. MalthaII; Gustavo A. M. M. PereiraIII; Antônio A. SilvaIII


By employing the Active compound Derivatization Method strategy, the commercial synthetic auxin 2-(naphtalen-1-yl)acetic acid (NAA) has been converted into a new tetraxone (5). In a pre-emergency bioassay, tetraoxane 5 was effective in inhibiting the growth of several weeds at 1.25 × 10-5 mol L-1.

http://dx.doi.org/10.21577/0100-4042.20170549

Publicado online: maio 19, 2020
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Total access: 1443

Quim. Nova 2020, 43(7), 909-913

 

Essential oil of Curcuma longa L. rhizomes chemical composition, yield variation and stability

Anabrisa Ferreira GuimarãesI; Ana Cláudia Andrade VinhasI; Angélica Ferraz GomesI*; Luiz Humberto SouzaII; Patrícia Baier KrepskyI


Oils of twelve samples of turmeric of different producers were analyzed. ar-Turmerone, α-turmerone and curlone were the main volatile compounds detected and a difference between the essential oil percentages after 6 months were also observed.

http://dx.doi.org/10.21577/0100-4042.20170547

Publicado online: maio 11, 2020
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Total access: 1443

Quim. Nova 2020, 43(7), 914-922

 

Processing of a metal concentrate from ground waste printed circuit boards in acidic media using hydrogen peroxide as oxidant

Calvin Sampaio Moreira da SilvaI; Guido Tande Crespo ZebaI; Christiano Mota Rodrigues da RochaI; Pedro Rosário GismontiI; Júlio Carlos AfonsoI*; Rubens Souza da SilvaII; Cláudio Augusto ViannaII; José Luiz MantovanoII


Leaching of a metal concentrate from ground printed circuit boards using new acidic oxidant mixtures: recovery of precious and base metals.

http://dx.doi.org/10.21577/0100-4042.20170575

Publicado online: junho 23, 2020
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Total access: 1348

Quim. Nova 2020, 43(7), 923-927

 

A salting-out assisted liquid-liquid extraction for the determination of tebuconazole, carbofuran and imidacloprid in white and rosé wines

Fernando J. G. Dagli; Josiele A. M. Conrado; Luiz André J. Silva; Alex D. Batista*


A miniaturized salting-out assisted liquid-liquid extraction procedure for determination of pesticides in wine as an alternative to conventional QuEChERS method.

http://dx.doi.org/10.21577/0100-4042.20170571

Publicado online: junho 18, 2020
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Total access: 1272

Revisão Quim. Nova 2020, 43(7), 951-958

 

Perspectivas de mercado e desafios da produção do ácido itacônico a partir de biomassa

Gabrielle das V. FragaI; Alisson D. S. RuyI; Luiz A. M. PontesI,*; Leila M. A. CamposII; Leonardo S. G. TeixeiraIII


The use of renewable sources is the key to economic development focused on sustainability. Itaconic acid is considered one of the twelve platform molecules that can be obtained from biomass using biotechnological processes.

http://dx.doi.org/10.21577/0100-4042.20170573

Publicado online: junho 18, 2020
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Total access: 1273

Quim. Nova 2020, 43(7), 959-973

 

Evolução da legislação e das técnicas analíticas aplicadas a estudos de estabilidade de insumos e produtos farmacêuticos

Julia Facci; Luan F. Diniz; Naialy F. A. Reis; Christian Fernandes*


We provided a detailed review about the evolution of the legislation, analytical and characterization techniques applied to stability studies of active pharmaceutical ingredients, excipients and drug products, in Brazil and worldwide.

http://dx.doi.org/10.21577/0100-4042.20170565

Publicado online: junho 10, 2020
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Total access: 1391

Nota Técnica Quim. Nova 2020, 43(7), 974-976

 

A unified formula for hydrocarbons with applications to functional groups

Higo B. NogueiraI; Norberto de Kássio V. MonteiroII,*; Pedro de Lima-NetoII


Unified equation for the description of any hydrocarbon.

http://dx.doi.org/10.21577/0100-4042.20170555

Publicado online: maio 29, 2020
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Total access: 866

Educação Quim. Nova 2020, 43(7), 977-986

 

A formação de professores de Química, mudanças na regulamentação e os impactos na estrutura em cursos de Licenciatura em Química

Deborah Rean Carreiro Matazo dos Santos*; Lilian Patrícia Lima; Gildo Girotto Junior#


Different factors that can impact on the Chemistry teachers training courses at university.

http://dx.doi.org/10.21577/0100-4042.20170567

Publicado online: junho 10, 2020
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Total access: 1330

Quim. Nova 2020, 43(7), 987-997

 

Modelo semiótico de leitura de inscrições: aplicação na Educação em Química

Mikeas Silva de Lima; Salete Linhares Queiroz*


Potentialities and limitations of the Semiotic Model for Reading Inscriptions for chemistry education.

http://dx.doi.org/10.21577/0100-4042.20170572

Publicado online: junho 18, 2020
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Total access: 980

Assuntos Gerais Quim. Nova 2020, 43(7), 998-1009

 

Novas tecnologias para o tratamento da tuberculose: o que as patentes nos dizem

Paula Teixeira Pinto Ferreira NetoI; Vanessa da Gama OliveiraI; Fabrícia Pires PimentaII*


New technologies for treating tuberculosis identified using patents as a source of information.

http://dx.doi.org/10.21577/0100-4042.20170581

Publicado online: junho 30, 2020
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Total access: 1003

On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
Química Nova
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