Pub Date : 2023-02-01DOI: 10.21577/0100-4042.20170968
Mariane Tegner, Fernanda Guterres, Isabela Ott, Lidiane da Motta, Deise Schmitz, M. Perassolo, Rafael Linden, Marina Antunes
DETERMINATION OF PHOSPHATIDYLETANOL IN DRIED BLOOD SPOT BY UHPLC-MS/MS: EVALUATION OF ALCOHOL CONSUMPTION IN CHEMICAL DEPENDENTS. We developed and validated an UHPLC-MS/MS method for the quantification of phosphatidylethanol (PEth) in dried blood spots (DBS). Sample preparation was a liquid extraction and chromatographic separation was performed in an Acquity C8 column. The mobile phases were 4 mM ammonium acetate in water (A) and acetonitrile (B) at 24:76 (v/v). The total analytical run time was 6 minutes, with retention time of 3.36 min for PEth and 4.13 min for phosphatidylpropanol. The method was linear from 10 to 3000 ng mL-1, specific, with, precise and accurate. The analyte was stable in DBS stored from -20 to 45 °C for 21 days. Matrix effect was compensated with the internal standard (-5.21% to + 6.09%). The method was applied in the evaluation of alcohol consumption in DBS from 25 chemical dependents. The PEth concentrations ranged from 14.5 to 2380.8 ng mL-1, with significant correlation with the self-report alcohol consumption AUDIT scores (r=0.41).
{"title":"DETERMINAÇÃO DE FOSFATIDILETANOL EM MANCHAS DE SANGUE SECO EM PAPEL POR UHPLC-MS/MS: AVALIAÇÃO DO CONSUMO DE ÁLCOOL EM DEPENDENTES QUÍMICOS","authors":"Mariane Tegner, Fernanda Guterres, Isabela Ott, Lidiane da Motta, Deise Schmitz, M. Perassolo, Rafael Linden, Marina Antunes","doi":"10.21577/0100-4042.20170968","DOIUrl":"https://doi.org/10.21577/0100-4042.20170968","url":null,"abstract":"DETERMINATION OF PHOSPHATIDYLETANOL IN DRIED BLOOD SPOT BY UHPLC-MS/MS: EVALUATION OF ALCOHOL CONSUMPTION IN CHEMICAL DEPENDENTS. We developed and validated an UHPLC-MS/MS method for the quantification of phosphatidylethanol (PEth) in dried blood spots (DBS). Sample preparation was a liquid extraction and chromatographic separation was performed in an Acquity C8 column. The mobile phases were 4 mM ammonium acetate in water (A) and acetonitrile (B) at 24:76 (v/v). The total analytical run time was 6 minutes, with retention time of 3.36 min for PEth and 4.13 min for phosphatidylpropanol. The method was linear from 10 to 3000 ng mL-1, specific, with, precise and accurate. The analyte was stable in DBS stored from -20 to 45 °C for 21 days. Matrix effect was compensated with the internal standard (-5.21% to + 6.09%). The method was applied in the evaluation of alcohol consumption in DBS from 25 chemical dependents. The PEth concentrations ranged from 14.5 to 2380.8 ng mL-1, with significant correlation with the self-report alcohol consumption AUDIT scores (r=0.41).","PeriodicalId":49641,"journal":{"name":"Quimica Nova","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68268723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.21577/0100-4042.20170969
C. Fidelis, M. Cipreste, P. Gastelois, W. Macedo, E. D. de Sousa
Resistant infectious microorganisms are causing a worldwide emerging problem, called antimicrobial resistance. To avoid this outbreak, new antimicrobial technologies are necessary. Silver nanoparticles (AgNPs) are known for their antibacterial properties and several studies have focused on their synthesis, characterization, and biological assays. One possibility to synthesize AgNPs is through gamma radiation, known as radiolytic synthesis. This work focuses on the radiolytic synthesis of AgNPs capped into a mesoporous silica nanoparticle aiming at an antimicrobial application. The variants of the radiolytic synthesis, which may influence the AgNPs formation, were studied and statistically compared by Design of Experiments Factorial Design in Minitab Software. The Ag content is statically dependent on dose, volume, and pH, as well as on two parameters interaction: [Ag+]-pH and [Ag+]-volume-pH interaction. Transmission electron microscopy and nitrogen adsorption analyses indicated the presence of subnanometric AgNPS located inside the mesopores. Silver nanoagglomerates were also found by transmission electron microscopy, which could be formed by silver oxides, as shown in X-ray photoelectron spectroscopy. AgNPs reduce the specific surface area of the silica nanoparticle, while the matrix morphology remains. The nanocomposites presented preliminary biocompatibility observed in in vitro biological assay using fibroblasts, which support their application in biological systems as antimicrobial substitutes.
耐药的传染性微生物正在引起一个全球性的新问题，称为抗菌素耐药性。为避免这一疫情，有必要采用新的抗菌技术。银纳米粒子(AgNPs)以其抗菌特性而闻名，一些研究集中在它们的合成、表征和生物测定上。合成AgNPs的一种可能性是通过伽马辐射，即辐射分解合成。这项工作的重点是辐射分解合成AgNPs盖成介孔二氧化硅纳米颗粒，旨在抗菌应用。利用Minitab软件中的Design of Experiments析因设计(Factorial Design)对可能影响AgNPs形成的辐射分解合成变异进行了研究和统计比较。Ag含量静态依赖于剂量、体积和pH，以及两个参数相互作用:[Ag+]-pH和[Ag+]-体积-pH相互作用。透射电镜和氮吸附分析表明，亚纳米AgNPS存在于介孔内。透射电镜还发现了银纳米团块，如x射线光电子能谱所示，银纳米团块可能是由氧化银形成的。AgNPs降低了二氧化硅纳米颗粒的比表面积，而基体形态保持不变。在体外成纤维细胞生物实验中观察到纳米复合材料具有初步的生物相容性，支持其作为抗菌替代品在生物系统中的应用。
{"title":"MESOPOROUS SILICA DECORATED WITH SILVER NANOPARTICLES – AN INVESTIGATION OF THE RADIOLYTIC SYNTHESIS PARAMETERS THROUGH FACTORIAL EXPERIMENTS","authors":"C. Fidelis, M. Cipreste, P. Gastelois, W. Macedo, E. D. de Sousa","doi":"10.21577/0100-4042.20170969","DOIUrl":"https://doi.org/10.21577/0100-4042.20170969","url":null,"abstract":"Resistant infectious microorganisms are causing a worldwide emerging problem, called antimicrobial resistance. To avoid this outbreak, new antimicrobial technologies are necessary. Silver nanoparticles (AgNPs) are known for their antibacterial properties and several studies have focused on their synthesis, characterization, and biological assays. One possibility to synthesize AgNPs is through gamma radiation, known as radiolytic synthesis. This work focuses on the radiolytic synthesis of AgNPs capped into a mesoporous silica nanoparticle aiming at an antimicrobial application. The variants of the radiolytic synthesis, which may influence the AgNPs formation, were studied and statistically compared by Design of Experiments Factorial Design in Minitab Software. The Ag content is statically dependent on dose, volume, and pH, as well as on two parameters interaction: [Ag+]-pH and [Ag+]-volume-pH interaction. Transmission electron microscopy and nitrogen adsorption analyses indicated the presence of subnanometric AgNPS located inside the mesopores. Silver nanoagglomerates were also found by transmission electron microscopy, which could be formed by silver oxides, as shown in X-ray photoelectron spectroscopy. AgNPs reduce the specific surface area of the silica nanoparticle, while the matrix morphology remains. The nanocomposites presented preliminary biocompatibility observed in in vitro biological assay using fibroblasts, which support their application in biological systems as antimicrobial substitutes.","PeriodicalId":49641,"journal":{"name":"Quimica Nova","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68268798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.21577/0100-4042.20230002
A. Pavão, G. Paiva, C. Bastos
Ignis fatuus, a luminous phenomenon witnessed over the centuries by observers around the world, is no longer seen in modern times, suggesting that it is extinct. An explanation for this disappearance can be found in the description of ignis fatuus as a cool flame of methane. Unlike a conventional flame, which generates large amounts of heat, ignis fatuus is a flame that glows without heat through a chemiluminescence process. Its characteristic bluish color is due to the emission of excited formaldehyde, which is formed in the slow combustion of methane. It is generally accepted that the phenomenon is a spontaneous combustion of swamp gas in contact with the oxygen in air, but an analysis of the energies involved in the cool flame process indicates that the phenomenon is not spontaneous in nature. Experiments carried out in the 19th century show torches being used to ignite ignis fatuus. The abandonment of fire in favor of night lighting may hold the secret to this mystery of ignis fatuus’s extinction.
{"title":"THE EXTINCTION OF THE IGNIS FATUUS","authors":"A. Pavão, G. Paiva, C. Bastos","doi":"10.21577/0100-4042.20230002","DOIUrl":"https://doi.org/10.21577/0100-4042.20230002","url":null,"abstract":"Ignis fatuus, a luminous phenomenon witnessed over the centuries by observers around the world, is no longer seen in modern times, suggesting that it is extinct. An explanation for this disappearance can be found in the description of ignis fatuus as a cool flame of methane. Unlike a conventional flame, which generates large amounts of heat, ignis fatuus is a flame that glows without heat through a chemiluminescence process. Its characteristic bluish color is due to the emission of excited formaldehyde, which is formed in the slow combustion of methane. It is generally accepted that the phenomenon is a spontaneous combustion of swamp gas in contact with the oxygen in air, but an analysis of the energies involved in the cool flame process indicates that the phenomenon is not spontaneous in nature. Experiments carried out in the 19th century show torches being used to ignite ignis fatuus. The abandonment of fire in favor of night lighting may hold the secret to this mystery of ignis fatuus’s extinction.","PeriodicalId":49641,"journal":{"name":"Quimica Nova","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68269057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.21577/0100-4042.20170967
Isabela Sasabuchi, Kamille Krieger, R. Nunes, A. Ferreira, G. Xavier, Alessandro Urzedo, W. Carvalho, Pedro Fadini
SUSTAINABILITY IN PHOSPHORUS USE: A BIBLIOGRAPHIC REVIEW FOCUSING ON THE CURRENT SITUATION IN THE STATE OF SÃO PAULO, BRAZIL. Phosphorus is a non-renewable element essential for the existence of life and also for food security. This resource has the property of limiting plant growth, becoming a fundamental part of agricultural production. On the other hand, when this element is present in high concentrations in aquatic environments, it can start a phenomenon called eutrophication, which causes a series of changes in biological succession processes and strongly negative impacts on species’ biodiversity and wealth. In this context, this work aimed, from an extensive bibliographical review, to gather strategic and essential information related to phosphorus sustainability, provoking a reflection regarding scenarios that involve this indispensable nutrient, focusing on the current situation of the State of São Paulo, Brazil, an important case study, both for the Brazilian and international scenario, by a gathering of data on the current situation of two of the main watersheds in the corresponding region. Relevant technologies used for phosphorus removal in eutrophicated environments are also addressed. Finally, the possibility of reusing the nutrients present in eutrophicated water bodies as an alternative source of phosphate fertilizer for agriculture is demonstrated.
{"title":"SUSTENTABILIDADE NO USO DE FÓSFORO: UMA REVISÃO BIBLIOGRÁFICA COM FOCO NA SITUAÇÃO ATUAL DO ESTADO DE SÃO PAULO, BRASIL","authors":"Isabela Sasabuchi, Kamille Krieger, R. Nunes, A. Ferreira, G. Xavier, Alessandro Urzedo, W. Carvalho, Pedro Fadini","doi":"10.21577/0100-4042.20170967","DOIUrl":"https://doi.org/10.21577/0100-4042.20170967","url":null,"abstract":"SUSTAINABILITY IN PHOSPHORUS USE: A BIBLIOGRAPHIC REVIEW FOCUSING ON THE CURRENT SITUATION IN THE STATE OF SÃO PAULO, BRAZIL. Phosphorus is a non-renewable element essential for the existence of life and also for food security. This resource has the property of limiting plant growth, becoming a fundamental part of agricultural production. On the other hand, when this element is present in high concentrations in aquatic environments, it can start a phenomenon called eutrophication, which causes a series of changes in biological succession processes and strongly negative impacts on species’ biodiversity and wealth. In this context, this work aimed, from an extensive bibliographical review, to gather strategic and essential information related to phosphorus sustainability, provoking a reflection regarding scenarios that involve this indispensable nutrient, focusing on the current situation of the State of São Paulo, Brazil, an important case study, both for the Brazilian and international scenario, by a gathering of data on the current situation of two of the main watersheds in the corresponding region. Relevant technologies used for phosphorus removal in eutrophicated environments are also addressed. Finally, the possibility of reusing the nutrients present in eutrophicated water bodies as an alternative source of phosphate fertilizer for agriculture is demonstrated.","PeriodicalId":49641,"journal":{"name":"Quimica Nova","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68269162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.21577/0100-4042.20170951
Yan-Li Gao, Yufei Wang, Huijin Liu, Xiaoli Song, Yali Wang, Ting Su, Shiqing Bi
The reaction of metal hexafluoroacetylacetonato [MII(hfac)2, M = Cu, Mn] with the stable nitronyl nitroxide 2−(3−isobutyl−pyrazole)−4,4,5,5−tetramethylimidazoline−1−oxyl−3−oxide (L), resulted in one dimensional zig−zag chain systems [{Cu(hfac)2}2L2]n and [CuMn(hfac)4L2]n. The main feature inherent in the nature of [{Cu(hfac)2}2L2]n single crystals is their ability to undergo reversible structural rearrangements with temperature variation, accompanied by anomalies of magnetism. The value of cmT shown strongly antiferromagnetic at low temperature and becomes ferromagnetic when the temperature increases. And the heteronuclear complex [CuMn(hfac)4L2]n shows antiferromagnetic interactions between manganese and nitronyl nitroxide.
{"title":"SYNTHESIS, CRYSTAL STRUCTURES AND MAGNETIC PROPERTIES OF COORDINATION COMPOUNDS WITH NITRONYL NITROXIDE RADICALS AND [M(HFAC)2] (M = CUII AND MNII)","authors":"Yan-Li Gao, Yufei Wang, Huijin Liu, Xiaoli Song, Yali Wang, Ting Su, Shiqing Bi","doi":"10.21577/0100-4042.20170951","DOIUrl":"https://doi.org/10.21577/0100-4042.20170951","url":null,"abstract":"The reaction of metal hexafluoroacetylacetonato [MII(hfac)2, M = Cu, Mn] with the stable nitronyl nitroxide 2−(3−isobutyl−pyrazole)−4,4,5,5−tetramethylimidazoline−1−oxyl−3−oxide (L), resulted in one dimensional zig−zag chain systems [{Cu(hfac)2}2L2]n and [CuMn(hfac)4L2]n. The main feature inherent in the nature of [{Cu(hfac)2}2L2]n single crystals is their ability to undergo reversible structural rearrangements with temperature variation, accompanied by anomalies of magnetism. The value of cmT shown strongly antiferromagnetic at low temperature and becomes ferromagnetic when the temperature increases. And the heteronuclear complex [CuMn(hfac)4L2]n shows antiferromagnetic interactions between manganese and nitronyl nitroxide.","PeriodicalId":49641,"journal":{"name":"Quimica Nova","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68268233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.21577/0100-4042.20170964
N. Lima, B. Rosa, Tais Poletti, B. Moreira, Amanda Leitzke, K. Mariotti, N. Carreño, Cláudio Pereira
CLASSIC HYDRAZONES AS FINGERMARK DEVELOPERS: AN EXPERIMENTAL ORGANIC CHEMISTRY PROPOSAL. Fingermark dusting powders are an important tool of forensic practitioners, being a first-choice process for most crime scene investigators. The development of new products is of utmost importance for forensic science. Hydrazones comprise compounds derived from ketones or aldehydes in reaction with hydrazines. These reactions are widely studied in organic chemistry because of the versatility of these compounds in organic synthesis. The study of these reactions leads to the understanding of the nucleophilicity of hydrazines, as well as the electrophilicity of aldehydes and ketones. The present work presents one proposal of experimental organic chemistry, aiming at a new application of this classic class of organic substances in forensic chemistry, specifically as a developer of latent fingermarks due to the variations of the color of the compounds, with spectra ranging in a range from 250 to 500 nm. These compounds were identified by Infrared Spectroscopy, Ultraviolet-Visible Spectroscopy and Mass Spectrometry. The development on glass surfaces demonstrated the potential application of these compounds in everyday life situations.
{"title":"AS CLÁSSICAS HIDRAZONAS COMO REVELADORES DE IMPRESSÕES DIGITAIS: UMA PROPOSTA DE QUÍMICA ORGÂNICA EXPERIMENTAL","authors":"N. Lima, B. Rosa, Tais Poletti, B. Moreira, Amanda Leitzke, K. Mariotti, N. Carreño, Cláudio Pereira","doi":"10.21577/0100-4042.20170964","DOIUrl":"https://doi.org/10.21577/0100-4042.20170964","url":null,"abstract":"CLASSIC HYDRAZONES AS FINGERMARK DEVELOPERS: AN EXPERIMENTAL ORGANIC CHEMISTRY PROPOSAL. Fingermark dusting powders are an important tool of forensic practitioners, being a first-choice process for most crime scene investigators. The development of new products is of utmost importance for forensic science. Hydrazones comprise compounds derived from ketones or aldehydes in reaction with hydrazines. These reactions are widely studied in organic chemistry because of the versatility of these compounds in organic synthesis. The study of these reactions leads to the understanding of the nucleophilicity of hydrazines, as well as the electrophilicity of aldehydes and ketones. The present work presents one proposal of experimental organic chemistry, aiming at a new application of this classic class of organic substances in forensic chemistry, specifically as a developer of latent fingermarks due to the variations of the color of the compounds, with spectra ranging in a range from 250 to 500 nm. These compounds were identified by Infrared Spectroscopy, Ultraviolet-Visible Spectroscopy and Mass Spectrometry. The development on glass surfaces demonstrated the potential application of these compounds in everyday life situations.","PeriodicalId":49641,"journal":{"name":"Quimica Nova","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68268997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/0100-4042.20230076
L. Magalhães, R. Alves, L. Cunha, Leonardo Rocha, M. Schiavon
ELABORATION OF A PLAYFUL METHOD FOR CHEMISTRY TEACHING: A GAME BASED ON DYE-SENSITIZED SOLAR CELLS. Considering the current environmental problems associated with the growing world demand for energy arising from development and population growth, the need to diversify energy matrices, such as the implementation of solar energy, is highlighted. Thus, it is important to discuss this topic in the school environment, because when they are introduced from childhood to high school, the probability of this orientation being effective is much greater. In this context, educational games have attracted attention as a teaching tool, combining a fun atmosphere with the improvement of learning. This work aimed the production and application of a game in board format representing a dye-sensitized solar cell (CSSC) as a didactic resource in approaching the content of energy conversion. The game allowed an easy visualization of how the energy conversion process is performed by a CSSC. It was presented during the scientific dissemination event “Café com Ciência”, promoted by the Federal University of São João del-Rei, with good results both in gameplay aspects and in helping to understand the theme. The feedback obtained indicates that the game can be a useful tool for students and educators, reaching all its didactic potential and facilitating learning in the face of complex concepts.
{"title":"ELABORAÇÃO DE UM MÉTODO LÚDICO PARA O ENSINO DE QUÍMICA: UM JOGO BASEADO EM CÉLULAS SOLARES SENSIBILIZADAS POR CORANTE","authors":"L. Magalhães, R. Alves, L. Cunha, Leonardo Rocha, M. Schiavon","doi":"10.21577/0100-4042.20230076","DOIUrl":"https://doi.org/10.21577/0100-4042.20230076","url":null,"abstract":"ELABORATION OF A PLAYFUL METHOD FOR CHEMISTRY TEACHING: A GAME BASED ON DYE-SENSITIZED SOLAR CELLS. Considering the current environmental problems associated with the growing world demand for energy arising from development and population growth, the need to diversify energy matrices, such as the implementation of solar energy, is highlighted. Thus, it is important to discuss this topic in the school environment, because when they are introduced from childhood to high school, the probability of this orientation being effective is much greater. In this context, educational games have attracted attention as a teaching tool, combining a fun atmosphere with the improvement of learning. This work aimed the production and application of a game in board format representing a dye-sensitized solar cell (CSSC) as a didactic resource in approaching the content of energy conversion. The game allowed an easy visualization of how the energy conversion process is performed by a CSSC. It was presented during the scientific dissemination event “Café com Ciência”, promoted by the Federal University of São João del-Rei, with good results both in gameplay aspects and in helping to understand the theme. The feedback obtained indicates that the game can be a useful tool for students and educators, reaching all its didactic potential and facilitating learning in the face of complex concepts.","PeriodicalId":49641,"journal":{"name":"Quimica Nova","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68273034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/0100-4042.20230072
Aline Ponzoni, André Slaviero, C. Passos, C. Sirtori
THEMATIC UNITS: POSSIBILITIES FOR THE DEVELOPMENT OF THE PRINCIPLES OF CRITICAL ENVIRONMENTAL EDUCATION. This work qualitatively analyzes the productions resulting from an extension course, developed with 24 teachers in initial and continuing training. This course was constituted by the (re)construction of knowledge related to Environmental Education (EE), in its critical aspect, to promote the debate on socio-environmental problems, allied to the theme of perfluorinated compounds, as a way of inserting these discussions in basic education, through the construction of teaching materials in the format of Thematic Units (TU). Thus, the objective of this study is to analyze the four TU produced by the course participants, in order to classify such productions supported by indicators and parameters of critical environmental education. Thus, it was possible to observe that most productions significantly contemplated these indicators, demonstrating that the activities and discussions developed enabled teachers to build a critical view of socio-environmental issues and perceptions of the possibility of developing them in the school environment.
{"title":"https://s3.sa-east-1.amazonaws.com/static.sites.sbq.org.br/quimicanova.sbq.org.br/pdf/ED2023-0003.pdf","authors":"Aline Ponzoni, André Slaviero, C. Passos, C. Sirtori","doi":"10.21577/0100-4042.20230072","DOIUrl":"https://doi.org/10.21577/0100-4042.20230072","url":null,"abstract":"THEMATIC UNITS: POSSIBILITIES FOR THE DEVELOPMENT OF THE PRINCIPLES OF CRITICAL ENVIRONMENTAL EDUCATION. This work qualitatively analyzes the productions resulting from an extension course, developed with 24 teachers in initial and continuing training. This course was constituted by the (re)construction of knowledge related to Environmental Education (EE), in its critical aspect, to promote the debate on socio-environmental problems, allied to the theme of perfluorinated compounds, as a way of inserting these discussions in basic education, through the construction of teaching materials in the format of Thematic Units (TU). Thus, the objective of this study is to analyze the four TU produced by the course participants, in order to classify such productions supported by indicators and parameters of critical environmental education. Thus, it was possible to observe that most productions significantly contemplated these indicators, demonstrating that the activities and discussions developed enabled teachers to build a critical view of socio-environmental issues and perceptions of the possibility of developing them in the school environment.","PeriodicalId":49641,"journal":{"name":"Quimica Nova","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68273191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/0100-4042.20230081
Jorge de Candido, R. Loguércio
WILL THERE BE SPACE FOR THE HUMAN IN THE AGE OF IN SILICO CHEMISTRY? The mobilization of this article/essay is to problematize the impact that new technologies (Artificial Intelligence and Automation) have on the subjects of science, especially in the field of chemistry. In a theoretical analysis, we discuss the potential that smart technologies emerge in our daily lives, in our studies, in our professional activities and in the construction of scientific knowledge itself. In a first analysis, there are three inflections that need to be considered when such technologies fold subjects, spaces, society and that is most innate to human beings: thinking and the construction of knowledge. Thus, the movements that chemistry and its subjects have – and will have – in this emerging (4th) Industrial Revolution are problematized.
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Pub Date : 2023-01-01DOI: 10.21577/0100-4042.20230089
J. Francisquini, Ramon Altivo, C. Díaz, Juliana S. da Costa, Daniela Kharfan, R. Stephani, Í. Perrone
The variety of vegetables available for plant-based beverage production is associated with a lack of specific regulatory aspects and difficult standardization. The aim of this study was to characterize the physicochemical properties of plant-based beverages (five different sources, three different market brands for each vegetable). The parameters studied were pH, moisture content, acidity, soluble ionic calcium at initial pH and pH 4.3, soluble solids, heat coagulation time (HCT), density, conductivity, surface zeta potential, morphology, polydispersity index, particle size. When comparing the mean values of the results found in the present work with model emulsions and/or plant based beverages produced on a laboratory scale, it can be found that the mean values for pH, moisture, soluble solids, calcium, surface zeta potential, particle size, and polydispersity index were similar to the reported values in the literature, however, acidity, HCT, density, and conductivity were lower than those reported in the literature. The coconut plantbased beverage exhibited the most significant statistical difference as compared to other plant-based beverages, especially in terms of pH, conductivity, particle size, and polydispersity index. This study is a promising aid to regulatory agencies and industries for standardization of nutritional value, production, stability, storage and chemical attributes of these beverages.
{"title":"PHYSICOCHEMICAL ASPECTS OF INDUSTRIAL PLANT-BASED BEVERAGES","authors":"J. Francisquini, Ramon Altivo, C. Díaz, Juliana S. da Costa, Daniela Kharfan, R. Stephani, Í. Perrone","doi":"10.21577/0100-4042.20230089","DOIUrl":"https://doi.org/10.21577/0100-4042.20230089","url":null,"abstract":"The variety of vegetables available for plant-based beverage production is associated with a lack of specific regulatory aspects and difficult standardization. The aim of this study was to characterize the physicochemical properties of plant-based beverages (five different sources, three different market brands for each vegetable). The parameters studied were pH, moisture content, acidity, soluble ionic calcium at initial pH and pH 4.3, soluble solids, heat coagulation time (HCT), density, conductivity, surface zeta potential, morphology, polydispersity index, particle size. When comparing the mean values of the results found in the present work with model emulsions and/or plant based beverages produced on a laboratory scale, it can be found that the mean values for pH, moisture, soluble solids, calcium, surface zeta potential, particle size, and polydispersity index were similar to the reported values in the literature, however, acidity, HCT, density, and conductivity were lower than those reported in the literature. The coconut plantbased beverage exhibited the most significant statistical difference as compared to other plant-based beverages, especially in terms of pH, conductivity, particle size, and polydispersity index. This study is a promising aid to regulatory agencies and industries for standardization of nutritional value, production, stability, storage and chemical attributes of these beverages.","PeriodicalId":49641,"journal":{"name":"Quimica Nova","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68273639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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