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21:55, sáb nov 2

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EDIÇÃO ATUAL vol. 45, No. 10, 2022



Artigo de Capa
Quim. Nova 2022, 45(10), 1265-1277

A química analítica aplicada aos estudos de pigmentos rupestres: uma revisão

Benedito B. Farias FilhoI,*; Maria Conceição S. M. LageII; Ana Luisa M. L. do NascimentoII; Iasmin Maria R. de S. VieiraII; Danyel Douglas M. de AlmeidaII; Wilkins O. de BarrosI

Approaches to analytical techniques employed for the study of rock art are discussed in this review.

http://dx.doi.org/10.21577/0100-4042.20170929

Publicado online: julho 26, 2022
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Total access: 1009

Artigo de Contra Capa
Quim. Nova 2022, 45(10), 1197-1204

Monitoramento da carga viral de SARS-CoV-2 em águas residuais na cidade de goiânia: epidemiologia baseada em esgoto e um sistema de alerta precoce para COVID-19

Geovana de Melo MendesI,#; Paulo Felipe Neves EstrelaI,#; Marcio Neres de Souza JuniorI; Núbia Natália de BritoI; Andréa Fernandes ArrudaI; Matheus Ribeiro AugustoII; Ieda Carolina Mantovani ClaroII; Adriana Feliciano Alves DuranII; Aline Diniz CabralII; Rodrigo de Freitas BuenoII; Gabriela Rodrigues Mendes DuarteI,*

The study aimed to monitor SARS-CoV-2 RNA in wastewater in Goiânia to estimate the viral prevalence in the population and anticipate clinical cases.

http://dx.doi.org/10.21577/0100-4042.20170933

Publicado online: agosto 19, 2022
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Total access: 866

Artigo Quim. Nova 2022, 45(10), 1183-1188

 

An alternative energy generation from charcoal produced from brazilian pine (Araucaria angustifolia (Bert.) O. Ktze) seed residues

Danielle Affonso SampaioI,*; Alfredo José dos Santos JuniorII; Ananias Francisco Dias JúniorII; Roberto Carlos Costa LelisI


Residues from the seeds of Brazilian pine (A. angustifolia) were submitted to the pyrolysis process. The charcoal obtained for seed residues had desirable energetic properties; such as higher fixed carbon and energy density, and its use is promising for bioenergy in the Atlantic Forest.

http://dx.doi.org/10.21577/0100-4042.20170924

Publicado online: julho 21, 2022
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Total access: 625

Quim. Nova 2022, 45(10), 1189-1196

 

Chemical profile and antioxidant activity of geopropolis from Melipona subnitida collected inside and outside the nest

Joselena Mendonça FerreiraI; Giuseppina NegriII,*; Maria Luiza Faria SalatinoII; Dejair MessageIII; Antonio SalatinoII


Chromatography profile of ethanolic extract from geopropolis of M. subnitida collected inside of the nest, at UV - 300. (-)-ESI-MS/MS spectra of 1-O-Coumaroyl-di-O-galloyl hexose and 1-O-Coumaroyl-2-O-galloyl hexose.

http://dx.doi.org/10.21577/0100-4042.20170928

Publicado online: julho 26, 2022
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Total access: 843

Quim. Nova 2022, 45(10), 1205-1213

 

Evaluation of sediment contamination by urban sewage in a stretch of Capibaribe river, Pernambuco, Brazil

Bruna Ramos de Souza GomesI; Rebeca dos Santos FrançaII; Alex Souza MoraesI; Giovana Anceski BataglionII; Jandyson Machado SantosI,*


The present study carried out a comprehensive characterization of sediments from the Capibaribe River using classical and sterol analyses in order to verify the level of environmental contamination.

http://dx.doi.org/10.21577/0100-4042.20170934

Publicado online: agosto 19, 2022
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Total access: 691

Quim. Nova 2022, 45(10), 1214-1222

 

Preparation and performance of magnetic zirconium-iron oxide nanoparticles loaded on palygorskite in the adsorption of phosphate from water

Xiaoshuang Song; Yanling Hao*; Qiqi Gao; Long Cheng


The adsorbent MZF/P was prepared by a facile method and it exhibited relatively efficient phosphate adsorption performance, was easy to regenerate and could be effectively reused.

http://dx.doi.org/10.21577/0100-4042.20170935

Publicado online: agosto 24, 2022
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Total access: 557

Quim. Nova 2022, 45(10), 1223-1229

 

Mitigación de la formación de acrilamida en papas fritas tipo chips mediante la adición de antioxidantes fenólicos de inca muña (Clinopodium bolivianum)

Marianella ZegarraI; Ana Aguilar-GalvezI; Rosana ChirinosI; Diego García-RíosII; Marienela CalsinIII; Romina PedreschiII; David CamposI,*


Phenolic antioxidants obtained from muña Inca leaves mitigate acrylamide formation in potato chips. The highest levels of mitigation (67.4%) were obtained with vacuum impregnation.

http://dx.doi.org/10.21577/0100-4042.20170937

Publicado online: agosto 19, 2022
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Total access: 737

Quim. Nova 2022, 45(10), 1230-1235

 

In silico prediction of inhibitory potential of a punicalagin β-anomer against SARS CoV-2 main protease (Mpro)

Norberto MonteiroI,*; Vitória MonteiroII; Lorena LimaII; Anna KarollineII; Richele MachadoII


Inhibitory effect of the punicalagin anomers against SARS-COV-2 main protease (Mpro).

http://dx.doi.org/10.21577/0100-4042.20170938

Publicado online: agosto 24, 2022
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Total access: 565

Quim. Nova 2022, 45(10), 1236-1244

 

Innovative gas chromatographic determination of formaldehyde by miniaturized extraction and on-fiber derivatization, via SPME and SPME arrow

Stefano DugheriI,*; Giovanni CappelliII; Jacopo CeccarelliII; Niccolò FanfaniIII; Lucia TrevisaniII; Donato SquillaciII; Elisabetta BucalettiII; Riccardo GoriIV; Nicola MucciII; Giulio ArcangeliII


This work proposes an innovative fully-automated application of headspace solid-phase microextraction (SPME) with on-fiber derivatization for the analysis of airborne FA emitted from liquid solutions or solid manufacts, in static mode, via gas chromatography-mass spectrometry.

http://dx.doi.org/10.21577/0100-4042.20170939

Publicado online: setembro 13, 2022
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Total access: 834

Quim. Nova 2022, 45(10), 1245-1250

 

Identifying olive oil fraud and adulteration using machine learning algorithms

Yasin YakarI,*; Kerim KaradağII


The adulteration of olive oils can be detected with machine learning algorithms.

http://dx.doi.org/10.21577/0100-4042.20170948

Publicado online: setembro 13, 2022
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Total access: 617

Revisão Quim. Nova 2022, 45(10), 1251-1264

 

Quimiometria III - revisitando a análise exploratória dos dados multivariados

Márcia Miguel Castro Ferreira*


Three methods for pattern recognition, used as exploratory data analysis, are revisited: PCA, Fisher's canonical variate analysis and ANOVA-PCA. The mathematical bases of the three methods are discussed as well as examples are presented.

http://dx.doi.org/10.21577/0100-4042.20170910

Publicado online: junho 1, 2022
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Total access: 1125

Nota Técnica Quim. Nova 2022, 45(10), 1278-1283

 

Determinação de etil-glicuronídeo e etil-sulfato em sangue por UPLC-MS/MS: aplicação clínica em vítimas de trauma

Isabela Ritter OttI; Mariane TegnerII; Fernando Engel GerbaseII,III; Octaviano Pereira Zago SagriloIII; Rafael LindenI,II; Marina Venzon AntunesI,II,*


We present a UPLC-MS/MS method for the quantification of the ethanol metabolites ethyl-glucuronide (EtG) and ethyl-sulfate (EtS) in blood samples. EtG and EtS blood levels from trauma patients with positive alcoholaemia were 0.25 to 14.11 µg ml-1 and 0.13 to 5.53 µg mL-1.

http://dx.doi.org/10.21577/0100-4042.20170926

Publicado online: julho 21, 2022
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Total access: 530

Quim. Nova 2022, 45(10), 1284-1288

 

Design, development, and implementation of 3D-printed polylactic acid centrifuge rotors for laboratory-scale applications

Luis F. Aiquipa MorenoI; Alexander G. Guillén VasquezI; Elizabeth C. PastranaI,II,*; Roxana Y. PastranaI,#


Low-cost 3D printed centrifuge.

http://dx.doi.org/10.21577/0100-4042.20170936

Publicado online: agosto 19, 2022
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Total access: 3433

Educação Quim. Nova 2022, 45(10), 1289-1295

 

Argumentación desde la enseñanza de las soluciones químicas

Edgar E. VargasI,*; Gina J. LeónII; Leonardo F. MartínezIII


The research highligths the importance of warking argumentative processes at different levels of academic training, with the purpose of developing structured arguments as proposes by Toulmin.

http://dx.doi.org/10.21577/0100-4042.20170940

Publicado online: setembro 13, 2022
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Total access: 546

Quim. Nova 2022, 45(10), 1296-1302

 

Identifying conceptions of the covalent bond: an analysis from a systematic review

Ricardo S. Baltieri; Marco A. Cebim; Amadeu M. Bego*


The Graphical Abstract shows different types of covalent bond representations and conceptions, since atoms that are happy to share the electrons, through electrons like dots and lines, and using a map of charge density.

http://dx.doi.org/10.21577/0100-4042.20170941

Publicado online: setembro 13, 2022
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Total access: 662

Quim. Nova 2022, 45(10), 1303-1314

 

Radiação térmica e a fórmula de Planck

Lucas Matheus Alves Gontijo; Clóves Gonçalves Rodrigues*


Energy density versus frequency for three temperature values. The dashed curve was obtained using the Rayleigh-Jeans equation for a temperature of 2000 K.

http://dx.doi.org/10.21577/0100-4042.20170942

Publicado online: setembro 13, 2022
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Total access: 595

Assuntos Gerais Quim. Nova 2022, 45(10), 1315-1321

 

Perfil cientométrico da quimiometria no Brasil

Germano Veras*; Vitor D. Alves; Hilthon A. Ramos; Mirelly Gomes; Lêda Figueiredo; Emilly V. S. Matias


Cientometry of the chemometrics in Brazil: scientific production, human resource development and maturity stage of the area.

http://dx.doi.org/10.21577/0100-4042.20170930

Publicado online: agosto 19, 2022
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Total access: 545

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