Pub Date : 2022-01-01DOI: 10.21577/1984-6835.20220058
Igor Resendes Barbosa, A. Echevarria
Sydnones are among the most studied mesoionic compounds to date, especially for their unusual structure and utility to act as precursors in the synthesis of other important heterocycles though sydnone-alkyne and sydnone-alkene cycloaddition reactions. Also, many studies have been focused on the medicinal chemistry aspects of these compounds, revealing their wide range of biological activities. This article presents a brief discussion regarding the structure, reactivity, aromaticity, and synthesis of the heterocyclic sydnone ring (1,2,3-oxadiazolium ring). Also, different derivatives are presented, describing their anticancer activities and, in some cases, their possible mechanisms of action.
{"title":"A Brief Review of Sydnone Heterocyclic Ring Synthesis and Anti-Cancer Activity of its Derivatives","authors":"Igor Resendes Barbosa, A. Echevarria","doi":"10.21577/1984-6835.20220058","DOIUrl":"https://doi.org/10.21577/1984-6835.20220058","url":null,"abstract":"Sydnones are among the most studied mesoionic compounds to date, especially for their unusual structure and utility to act as precursors in the synthesis of other important heterocycles though sydnone-alkyne and sydnone-alkene cycloaddition reactions. Also, many studies have been focused on the medicinal chemistry aspects of these compounds, revealing their wide range of biological activities. This article presents a brief discussion regarding the structure, reactivity, aromaticity, and synthesis of the heterocyclic sydnone ring (1,2,3-oxadiazolium ring). Also, different derivatives are presented, describing their anticancer activities and, in some cases, their possible mechanisms of action.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84944591","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 : 2022-01-01DOI: 10.21577/1984-6835.20220096
Thaís Cristina de Oliveira Cândido, Rafaela Fernandes Ribeiro, Marden Pires Moura, Ana Paula de Carvalho Teixeira, Paula Sevenini Pinto
Sectors such as iron mining and the textile industry are of great importance to the economy, but their activities may be related to significant environmental problems, such as the generation of tailings and contaminants in the water, respectively. This work aimed the synthesis of carbon nanostructures by the CVD process, at 900 o C, using methane as carbon source, using two iron ore tailings for later application in the removal of dyes. The characterization of the materials indicated that the pure tailings had iron oxide phases that were transformed into α -Fe and γ -Fe after the CVD process. TG indicated 38.7 and 66.0% of carbon for RA CVD 900 and RL CVD 900, respectively, and Raman indicated the formation of graphitic and well-organized nanostructures. The adsorption results showed that all materials were able to adsorb methylene blue and carmine indigo dyes in aqueous solution, with removal rates of 85 and 53%, with RA CVD 900 being the best material for adsorption.
{"title":"Carbon Nanostructures from Tailings: Synthesis, Characterization and Application in Dye Adsorption","authors":"Thaís Cristina de Oliveira Cândido, Rafaela Fernandes Ribeiro, Marden Pires Moura, Ana Paula de Carvalho Teixeira, Paula Sevenini Pinto","doi":"10.21577/1984-6835.20220096","DOIUrl":"https://doi.org/10.21577/1984-6835.20220096","url":null,"abstract":"Sectors such as iron mining and the textile industry are of great importance to the economy, but their activities may be related to significant environmental problems, such as the generation of tailings and contaminants in the water, respectively. This work aimed the synthesis of carbon nanostructures by the CVD process, at 900 o C, using methane as carbon source, using two iron ore tailings for later application in the removal of dyes. The characterization of the materials indicated that the pure tailings had iron oxide phases that were transformed into α -Fe and γ -Fe after the CVD process. TG indicated 38.7 and 66.0% of carbon for RA CVD 900 and RL CVD 900, respectively, and Raman indicated the formation of graphitic and well-organized nanostructures. The adsorption results showed that all materials were able to adsorb methylene blue and carmine indigo dyes in aqueous solution, with removal rates of 85 and 53%, with RA CVD 900 being the best material for adsorption.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81902627","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 : 2022-01-01DOI: 10.21577/1984-6835.20220131
Luceli Roloff, Maria G. T. C. Ribeiro, Fauze J. Anaissi
{"title":"Analysis of substances involved in the synthesis of metallic complexes in the laboratory context of courses in chemistry in Brazil","authors":"Luceli Roloff, Maria G. T. C. Ribeiro, Fauze J. Anaissi","doi":"10.21577/1984-6835.20220131","DOIUrl":"https://doi.org/10.21577/1984-6835.20220131","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83237709","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 : 2022-01-01DOI: 10.21577/1984-6835.20220045
Gabriel Mustafá Misirli, Beatriz Ferreira de Carvalho Patricio, Shirley de Mello Pereira Abrantes
Recent studies with silver nanoparticles (AgNPs), a broad spectrum bactericidal and virucidal agent, place them as a promising ingredient in fighting the spread of multiresistant bacteria, viruses and neglected diseases, as well as other biological uses. In this review, we show the difference between the mechanisms of the AgNPs and silver ions (Ag + ) in the chemical, biological and toxicological level, as well as the augmented influence of the bactericidal activity in the facets {111}. To better understand the efficacy of the AgNPs as an antimicrobial agent, the mechanism of action of the AgNPs was analyzed in bacteria and viruses. Furthermore, we described intrinsic and extrinsic factors that directly affect the physical-chemical stability of AgNPs and are essential for their biological use, in future clinical studies and in the development of new products containing AgNPs.
{"title":"Silver Nanoparticles for Antibacterial Use: Extrinsic and Intrinsic Factors to Increase Stability","authors":"Gabriel Mustafá Misirli, Beatriz Ferreira de Carvalho Patricio, Shirley de Mello Pereira Abrantes","doi":"10.21577/1984-6835.20220045","DOIUrl":"https://doi.org/10.21577/1984-6835.20220045","url":null,"abstract":"Recent studies with silver nanoparticles (AgNPs), a broad spectrum bactericidal and virucidal agent, place them as a promising ingredient in fighting the spread of multiresistant bacteria, viruses and neglected diseases, as well as other biological uses. In this review, we show the difference between the mechanisms of the AgNPs and silver ions (Ag + ) in the chemical, biological and toxicological level, as well as the augmented influence of the bactericidal activity in the facets {111}. To better understand the efficacy of the AgNPs as an antimicrobial agent, the mechanism of action of the AgNPs was analyzed in bacteria and viruses. Furthermore, we described intrinsic and extrinsic factors that directly affect the physical-chemical stability of AgNPs and are essential for their biological use, in future clinical studies and in the development of new products containing AgNPs.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83339733","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 : 2022-01-01DOI: 10.21577/1984-6835.20220127
Daniel Ananias, José G. Rocha Jr, Rosane N. Castro, Inês R. W. Z. de Oliveira
{"title":"Electrochemical Biosensors Based on Peroxidase: A Review","authors":"Daniel Ananias, José G. Rocha Jr, Rosane N. Castro, Inês R. W. Z. de Oliveira","doi":"10.21577/1984-6835.20220127","DOIUrl":"https://doi.org/10.21577/1984-6835.20220127","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77762915","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 : 2022-01-01DOI: 10.21577/1984-6835.20220016
Yslaine A. de Almeida, Iara de F. Gimenez
In recent years, scientific research on new materials has gradually increased, most of which being part of our daily lives. Among these materials, we can focus on conductive polymers such as polypyrrole (PPy), which has a variety of properties, such as electrical conductivity, good chemical stability and excellent biocompatibility. This combination of properties for applications in the form of hydrogels enables a wide area of applications. Some of these hydrogels can be exemplified in this brief review containing explanatory topics to guide the proposed study. We evidenced that in the last 25 years, not only have scientific articles increased in research databases, but also requests for patent deposits.
{"title":"Recent Advances in Polypyrrole Hydrogels: A Brief Review","authors":"Yslaine A. de Almeida, Iara de F. Gimenez","doi":"10.21577/1984-6835.20220016","DOIUrl":"https://doi.org/10.21577/1984-6835.20220016","url":null,"abstract":"In recent years, scientific research on new materials has gradually increased, most of which being part of our daily lives. Among these materials, we can focus on conductive polymers such as polypyrrole (PPy), which has a variety of properties, such as electrical conductivity, good chemical stability and excellent biocompatibility. This combination of properties for applications in the form of hydrogels enables a wide area of applications. Some of these hydrogels can be exemplified in this brief review containing explanatory topics to guide the proposed study. We evidenced that in the last 25 years, not only have scientific articles increased in research databases, but also requests for patent deposits.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77741922","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 : 2022-01-01DOI: 10.21577/1984-6835.20230005
Jeferson B. Eilert, Flávia Carvalho Malta de Mello, E. Batista, J. Nicolini, K. Nicolini
{"title":"Obtaining Mathematical Models Combined with Infrared Spectroscopy Data and the Use of Artemia salina as a Biological Indicator to Predict the Toxicity of the Biochars","authors":"Jeferson B. Eilert, Flávia Carvalho Malta de Mello, E. Batista, J. Nicolini, K. Nicolini","doi":"10.21577/1984-6835.20230005","DOIUrl":"https://doi.org/10.21577/1984-6835.20230005","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90794123","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 : 2022-01-01DOI: 10.21577/1984-6835.20220071
Liliane O. Mota, Iara F. Gimenez
biopolymer attention by researchers in several different fields. Hydroxyl groups on cellulose chains can be chemically modified in order to improve physico-chemical properties enabling applications in different areas such as biomaterials for implants, removal of chemical components from water and hydrogels for the delivery of drugs and fertilizers. In this context, chemical crosslinkers may also bring advantages to cellulose-based materials and derivatives improving their thermal stability, surface area and swelling degree of hydrogels. Among many chemical crosslinkers, epichlorohydrin has been used in recent years to prepare materials based on cellulose and other biopolymers. Thus, here we aim to review recent works reporting cellulose-based materials crosslinked with epichlorohydrin in a comparative approach with other common agents such as glutaraldehyde and citric acid, their advantages and disadvantages as well as future prospects.
{"title":"Cellulose-Based Materials Crosslinked with Epichlorohydrin: A Mini Review","authors":"Liliane O. Mota, Iara F. Gimenez","doi":"10.21577/1984-6835.20220071","DOIUrl":"https://doi.org/10.21577/1984-6835.20220071","url":null,"abstract":"biopolymer attention by researchers in several different fields. Hydroxyl groups on cellulose chains can be chemically modified in order to improve physico-chemical properties enabling applications in different areas such as biomaterials for implants, removal of chemical components from water and hydrogels for the delivery of drugs and fertilizers. In this context, chemical crosslinkers may also bring advantages to cellulose-based materials and derivatives improving their thermal stability, surface area and swelling degree of hydrogels. Among many chemical crosslinkers, epichlorohydrin has been used in recent years to prepare materials based on cellulose and other biopolymers. Thus, here we aim to review recent works reporting cellulose-based materials crosslinked with epichlorohydrin in a comparative approach with other common agents such as glutaraldehyde and citric acid, their advantages and disadvantages as well as future prospects.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79046716","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 : 2022-01-01DOI: 10.21577/1984-6835.20230003
Lucas de O. Pires, Rosane N. Castro
{"title":"Isolation and Quantification of the Main Prenylated Compounds from Brazilian Green Propolis with Antioxidant Properties","authors":"Lucas de O. Pires, Rosane N. Castro","doi":"10.21577/1984-6835.20230003","DOIUrl":"https://doi.org/10.21577/1984-6835.20230003","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"99 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77091062","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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