Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230027
Ana Luiza G. Mendes, Gustavo R. Bitencourt, Gabrielle D. Iop, Sindy R. Krzyzaniak, Darliana M. Souza, Paola A. Mello
An investigation was carried out to evaluate the contribution of the activities and effects of a University Campus on the waters that are part of its natural environment, by focusing on the determination of halogens. This case study was undertaken on the Federal University of Santa Maria campus, Santa Maria city, where teaching and research activities occur, in addition to the main regional Hospital and University Residence inside the campus. Composite sampling was carried out over 12 h at five strategic points, from the stream’s entrance to the exit of the university campus. Chlorine, bromine, and iodine were determined by inductively coupled plasma mass spectrometry (ICP-MS) and fluoride, chloride, bromide, and iodide species were determined by ion chromatography (IC). Results revealed that among the activities developed on the university campus, those carried out at the hospital have the greatest impact on halogen concentrations. Nonetheless, a comparison of the analyte concentrations in the inlet and outlet streams, showed that they are generally similar or smaller to those in other streams except for iodine.
{"title":"Halogen (and Species) Determination in Surface Water by Inductively Coupled Plasma Mass Spectrometry and Ion Chromatography","authors":"Ana Luiza G. Mendes, Gustavo R. Bitencourt, Gabrielle D. Iop, Sindy R. Krzyzaniak, Darliana M. Souza, Paola A. Mello","doi":"10.21577/1984-6835.20230027","DOIUrl":"https://doi.org/10.21577/1984-6835.20230027","url":null,"abstract":"An investigation was carried out to evaluate the contribution of the activities and effects of a University Campus on the waters that are part of its natural environment, by focusing on the determination of halogens. This case study was undertaken on the Federal University of Santa Maria campus, Santa Maria city, where teaching and research activities occur, in addition to the main regional Hospital and University Residence inside the campus. Composite sampling was carried out over 12 h at five strategic points, from the stream’s entrance to the exit of the university campus. Chlorine, bromine, and iodine were determined by inductively coupled plasma mass spectrometry (ICP-MS) and fluoride, chloride, bromide, and iodide species were determined by ion chromatography (IC). Results revealed that among the activities developed on the university campus, those carried out at the hospital have the greatest impact on halogen concentrations. Nonetheless, a comparison of the analyte concentrations in the inlet and outlet streams, showed that they are generally similar or smaller to those in other streams except for iodine.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76353238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230030
Gabriel B. de Carvalho, Pedro E. Costa, Luis C. de Morais, D. Pasquini
{"title":"Preparation of Polymeric Membranes and Application as an Interdisciplinary Investigative Proposal for Teaching Chemistry","authors":"Gabriel B. de Carvalho, Pedro E. Costa, Luis C. de Morais, D. Pasquini","doi":"10.21577/1984-6835.20230030","DOIUrl":"https://doi.org/10.21577/1984-6835.20230030","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86747999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230057
Rômulo Faria Santos Canto, Itamar Luís Gonçalves, Mário Alf da Rosa, Vera Lucia Eifler-Lima
{"title":"Biginelli Reaction under Chemically Friendly and in Parallel Conditions: a Practical Class of Organic Synthesis for Medicinal Chemistry, Chemistry and Pharmacy Courses","authors":"Rômulo Faria Santos Canto, Itamar Luís Gonçalves, Mário Alf da Rosa, Vera Lucia Eifler-Lima","doi":"10.21577/1984-6835.20230057","DOIUrl":"https://doi.org/10.21577/1984-6835.20230057","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135508011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230034
Valdenir P. Morais, Cassia C. Fernandes, Carlos H. G. Martins, Antônio E. M. Crott, Mayker L. D. Miranda
Plants and their extracts have been used as natural antimicrobial agents in food products as a strategy to mitigate food contamination. Therefore, this study aimed to determine the chemical composition of hexane extracts from Piper aduncum leaves and inflorescences (HE-PL and HE-PI, respectively) and from Xylopia aromatica leaves (HE-XA) by gas chromatography-mass spectrometry (GC-MS) and gas chromatography-flame ionization detection (GC-FID). Antibacterial activities of HE-PL, HE-PI and HE-XA were evaluated in terms of their minimum inhibitory concentration (MIC = µg/mL) and minimum bactericidal concentration (MBC = µg/mL) values by the broth microdilution method in 96-well microplates. Major constituents found in HE-PL were germacrene B (33.1%), valencene (14.5%), β -cadinene (9.1%) and α -humulene (8.1%) while the ones found in HE-PI were sesquiterpenes caryophyllene oxide (20.5%), spathulenol (15.2%) and germacrene B (9.7%). Spathulenol (41.2%), α -copaene (16.6%) and β -phellandrene (7.9%) were the major constituents in HE-XA. Since the extracts under study exhibited excellent MIC and MBC values, they showed high bioactive potential against Bacillus cereus , Salmonella typhimurium , Escherichia coli , Brochothrix thermosphacta , Clostridium botulinum and Pseudomonas fluorescens . Besides, this study showed, for the first time, that both P. aduncum and X. aromatica have antimicrobial properties against these microorganisms, a fact that reveals their biotechnological potential in food preservation.
{"title":"Bioactive Hexane Extracts from Piper aduncum and Xylopia aromatica Against Bacterial Strains which Cause Food Poisoning","authors":"Valdenir P. Morais, Cassia C. Fernandes, Carlos H. G. Martins, Antônio E. M. Crott, Mayker L. D. Miranda","doi":"10.21577/1984-6835.20230034","DOIUrl":"https://doi.org/10.21577/1984-6835.20230034","url":null,"abstract":"Plants and their extracts have been used as natural antimicrobial agents in food products as a strategy to mitigate food contamination. Therefore, this study aimed to determine the chemical composition of hexane extracts from Piper aduncum leaves and inflorescences (HE-PL and HE-PI, respectively) and from Xylopia aromatica leaves (HE-XA) by gas chromatography-mass spectrometry (GC-MS) and gas chromatography-flame ionization detection (GC-FID). Antibacterial activities of HE-PL, HE-PI and HE-XA were evaluated in terms of their minimum inhibitory concentration (MIC = µg/mL) and minimum bactericidal concentration (MBC = µg/mL) values by the broth microdilution method in 96-well microplates. Major constituents found in HE-PL were germacrene B (33.1%), valencene (14.5%), β -cadinene (9.1%) and α -humulene (8.1%) while the ones found in HE-PI were sesquiterpenes caryophyllene oxide (20.5%), spathulenol (15.2%) and germacrene B (9.7%). Spathulenol (41.2%), α -copaene (16.6%) and β -phellandrene (7.9%) were the major constituents in HE-XA. Since the extracts under study exhibited excellent MIC and MBC values, they showed high bioactive potential against Bacillus cereus , Salmonella typhimurium , Escherichia coli , Brochothrix thermosphacta , Clostridium botulinum and Pseudomonas fluorescens . Besides, this study showed, for the first time, that both P. aduncum and X. aromatica have antimicrobial properties against these microorganisms, a fact that reveals their biotechnological potential in food preservation.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88657138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230032
Adriana da Veiga Torres, Jhully Rangel de Oliveira Gonçalves, Rafael Pinheiro Caetano Damasceno, Juliana Baptista Simões
Teaching Chemistry involves knowledge that helps to explain natural phenomena. Despite this, it faces adversities both to be taught and to be learned. Therefore, this work proposes the theme of aromatherapy in an essential oil extraction workshop as a methodology for contextualizing the teaching of Organic Chemistry. The workshops took place during the 9th Academic Week of the IFFluminense Campus Itaperuna, lasting 15-20 minutes, for 180 students. The workshop was structured in the approach of the Three Pedagogical Moments and used extraction techniques by steam drag, hydrodistillation and by Soxhlet using cloves, cinnamon sticks and peppermint as plant material. 3D-printed molecules of the major compounds of the oils were also used to visualize the structures. The results were evaluated through pre- and post-workshop questionnaires. Through the questionnaires, questions relevant to the reality of Brazilian education can be observed, and that after the workshop 80% of the students said they felt motivated to study Organic Chemistry, in addition to the 10.6% increase in correct answers in the question: “Do you know which is the element considered the ‘building block’ of life?”.
{"title":"The Approach to Aromatherapy and Essential Oils Extraction as a Generating Theme for Teaching Organic Chemistry","authors":"Adriana da Veiga Torres, Jhully Rangel de Oliveira Gonçalves, Rafael Pinheiro Caetano Damasceno, Juliana Baptista Simões","doi":"10.21577/1984-6835.20230032","DOIUrl":"https://doi.org/10.21577/1984-6835.20230032","url":null,"abstract":"Teaching Chemistry involves knowledge that helps to explain natural phenomena. Despite this, it faces adversities both to be taught and to be learned. Therefore, this work proposes the theme of aromatherapy in an essential oil extraction workshop as a methodology for contextualizing the teaching of Organic Chemistry. The workshops took place during the 9th Academic Week of the IFFluminense Campus Itaperuna, lasting 15-20 minutes, for 180 students. The workshop was structured in the approach of the Three Pedagogical Moments and used extraction techniques by steam drag, hydrodistillation and by Soxhlet using cloves, cinnamon sticks and peppermint as plant material. 3D-printed molecules of the major compounds of the oils were also used to visualize the structures. The results were evaluated through pre- and post-workshop questionnaires. Through the questionnaires, questions relevant to the reality of Brazilian education can be observed, and that after the workshop 80% of the students said they felt motivated to study Organic Chemistry, in addition to the 10.6% increase in correct answers in the question: “Do you know which is the element considered the ‘building block’ of life?”.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79594740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230046
Ricardo Soares
{"title":"Can the Responsible use of Artificial Intelligence Assist in the Resurgence of Brazilian Scientific Production?","authors":"Ricardo Soares","doi":"10.21577/1984-6835.20230046","DOIUrl":"https://doi.org/10.21577/1984-6835.20230046","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"136 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76738788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230041
E. Cruz, Simone Vilela Talma, João Batista Barbosa, Raphael Pires Bolzan, Silvia Menezes de Faria Pereira, Silvania Alves Ladeira, Meire Lelis Leal Martins
Enzymes with greater thermostability and alkaline stability have become the main choice as detergent additives. In this article, the compatibility of cellulases recovered from a thermophilic Bacillus sp. SMIA‑2 in the presence of the surfactants, oxidizing and bleaching agents was studied. In addition, the Central Composite Design (CCD) was adopted to determine the range of the best concentrations of a mixture of three components: Triton X‑100, Renex 95
具有较强热稳定性和碱性稳定性的酶已成为洗涤剂添加剂的主要选择。本文研究了从嗜热芽孢杆菌SMIA‑2中回收的纤维素酶在表面活性剂、氧化剂和漂白剂存在下的相容性。此外，采用中心复合设计(CCD)来确定三种成分混合物的最佳浓度范围:Triton X - 100, Renex 95
{"title":"Effectiveness of Bacillus sp. SMIA-2 Cellulases as an Additive in Detergent Formulations","authors":"E. Cruz, Simone Vilela Talma, João Batista Barbosa, Raphael Pires Bolzan, Silvia Menezes de Faria Pereira, Silvania Alves Ladeira, Meire Lelis Leal Martins","doi":"10.21577/1984-6835.20230041","DOIUrl":"https://doi.org/10.21577/1984-6835.20230041","url":null,"abstract":"Enzymes with greater thermostability and alkaline stability have become the main choice as detergent additives. In this article, the compatibility of cellulases recovered from a thermophilic Bacillus sp. SMIA‑2 in the presence of the surfactants, oxidizing and bleaching agents was studied. In addition, the Central Composite Design (CCD) was adopted to determine the range of the best concentrations of a mixture of three components: Triton X‑100, Renex 95","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80176616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230045
Leonardo G. C. de Moraes, David R. da Rocha
This review article presents an overview of the different methodologies developed for the synthesis of monohalogenated analogues of juglone ( 1 ), which is a versatile structural scaffold with a wide range of biological activities. The synthesis of these monohalogenated analogues is of great importance in organic synthesis, especially for the pharmaceutical and agrochemical industries, as they are key intermediates in the regiospecificity of synthetic routes for the production of analogues and derivatives of 1 . This review article presents the different regiospecific strategies used for the production of mono-chlorinated, mono-brominated and mono-iodinated analogues of 1 , in addition to highlighting their differences based on melting point and crystallographic studies. In short, this article provides a valuable reference for researchers in the area of organic synthesis who aim to develop innovative bioactive molecules.
{"title":"Strategies for the Synthesis of Monohalogenated Analogues of Juglone: Unlocking the Potential of Regiospecific Synthesis Methodologies","authors":"Leonardo G. C. de Moraes, David R. da Rocha","doi":"10.21577/1984-6835.20230045","DOIUrl":"https://doi.org/10.21577/1984-6835.20230045","url":null,"abstract":"This review article presents an overview of the different methodologies developed for the synthesis of monohalogenated analogues of juglone ( 1 ), which is a versatile structural scaffold with a wide range of biological activities. The synthesis of these monohalogenated analogues is of great importance in organic synthesis, especially for the pharmaceutical and agrochemical industries, as they are key intermediates in the regiospecificity of synthetic routes for the production of analogues and derivatives of 1 . This review article presents the different regiospecific strategies used for the production of mono-chlorinated, mono-brominated and mono-iodinated analogues of 1 , in addition to highlighting their differences based on melting point and crystallographic studies. In short, this article provides a valuable reference for researchers in the area of organic synthesis who aim to develop innovative bioactive molecules.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77741736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230052
Rosilene A. de Oliveira, Ana Carolline S. Gonçalves, Daniel de C. Lima, Fernando F. de Oliveira
During storage, medicinal plants can undergo undesirable chemical reactions that affect their quality and effectiveness. In this study
{"title":"Storage of Piper umbellatum L. Leaves Interferes with the Quality of the Essential Oil","authors":"Rosilene A. de Oliveira, Ana Carolline S. Gonçalves, Daniel de C. Lima, Fernando F. de Oliveira","doi":"10.21577/1984-6835.20230052","DOIUrl":"https://doi.org/10.21577/1984-6835.20230052","url":null,"abstract":"During storage, medicinal plants can undergo undesirable chemical reactions that affect their quality and effectiveness. In this study","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136203118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230061
José A. M. Oliveira, Josiane D. Costa, Arthur F. de Almeida, Ana R. N. Campos, Aureliano X. dos Santos, Renato A. C. de Santana
{"title":"Surface Modification of NiTi Shape Memory Alloys with Chitosan-Based Coatings: A Brief Literature Review.","authors":"José A. M. Oliveira, Josiane D. Costa, Arthur F. de Almeida, Ana R. N. Campos, Aureliano X. dos Santos, Renato A. C. de Santana","doi":"10.21577/1984-6835.20230061","DOIUrl":"https://doi.org/10.21577/1984-6835.20230061","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135704878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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