Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230015
Luis Guilherme Rodrigues Miranda, Karla Pereira Rainha, Pedro Henrique Pereira da Cunha, Hudson Costa Oliveira, Gilberto Fonseca Barroso, P. Filgueiras, Eustáquio Vinicius Ribeiro de Castro
{"title":"Use of Remote Sensing and Chemometrics as Tools to Estimate Parameters of Water Quality in Intermittent Lakes of the Lower Doce River","authors":"Luis Guilherme Rodrigues Miranda, Karla Pereira Rainha, Pedro Henrique Pereira da Cunha, Hudson Costa Oliveira, Gilberto Fonseca Barroso, P. Filgueiras, Eustáquio Vinicius Ribeiro de Castro","doi":"10.21577/1984-6835.20230015","DOIUrl":"https://doi.org/10.21577/1984-6835.20230015","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85215062","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: 10.21577/1984-6835.20230044
Thalisia C. dos Santos, Johanna M. C. Obando, Roberto C. C. Martins, Marina A. Alves, Roberto C. Villaça, Levi P. Machado, Maria Cândida de G. Gasparoto, Diana N. Cavalcanti
The brown macroalgae Dictyota menstrualis constitutes an organism with a rich and diverse metabolism in terms of the chemistry of natural products. It is known to mainly produce diterpenes, in addition to sterols, vitamins and polysaccharides with antiviral, anti-inflammatory, anticoagulant and antioxidant properties. Despite its vast metabolic arsenal, most studies are directed to the identification of already known diterpenes, opening the field of investigation for new approaches and discoveries. Knowing this, this work aims to chemically characterize the macroalgae D. menstrualis through the technique of Ultra Efficiency Liquid Chromatography associated with High-Resolution Mass Spectrometry (UPLC-HRMS) and perform a biological screening of potential antioxidants and antifungals through bioautography. For this, specimens of D. menstrualis were collected in the São Pedro São Paulo Archipelago (PE, Brazil) and attended to ingestion with dichloromethane and fractionation by column chromatography with silica gel. The extract and fractions were then analyzed by UPLC-HRMS with ElectroSpray Ionization (ESI) in positive mode. In addition, bioautography assays were performed to evaluate the antioxidant potential with DPPH and the antifungal potential against the Cladosporium sphaerospermum . The UPLC-HRMS analyzes allowed identifying diterpenes, sterols, faty acids, glycerolipids, derivatives of photosynthetic pigments and carotenoids. Bioautography assays suggested antifungal and antioxidant potential of the organic extract and fractions. Thus, the results suggest that D. menstrualis has pharmacological potential to be explored and that studies on its chemical composition using modern techniques such as UPLC-HRMS can lead to the discovery of new structures and reinforcement of the knowledge of the chemistry of this algae.
{"title":"Chemical Profile by UPLC-HRMS and Antifungal and Antioxidant Activity of Marine Macroalgae Dictyota menstrualis","authors":"Thalisia C. dos Santos, Johanna M. C. Obando, Roberto C. C. Martins, Marina A. Alves, Roberto C. Villaça, Levi P. Machado, Maria Cândida de G. Gasparoto, Diana N. Cavalcanti","doi":"10.21577/1984-6835.20230044","DOIUrl":"https://doi.org/10.21577/1984-6835.20230044","url":null,"abstract":"The brown macroalgae Dictyota menstrualis constitutes an organism with a rich and diverse metabolism in terms of the chemistry of natural products. It is known to mainly produce diterpenes, in addition to sterols, vitamins and polysaccharides with antiviral, anti-inflammatory, anticoagulant and antioxidant properties. Despite its vast metabolic arsenal, most studies are directed to the identification of already known diterpenes, opening the field of investigation for new approaches and discoveries. Knowing this, this work aims to chemically characterize the macroalgae D. menstrualis through the technique of Ultra Efficiency Liquid Chromatography associated with High-Resolution Mass Spectrometry (UPLC-HRMS) and perform a biological screening of potential antioxidants and antifungals through bioautography. For this, specimens of D. menstrualis were collected in the São Pedro São Paulo Archipelago (PE, Brazil) and attended to ingestion with dichloromethane and fractionation by column chromatography with silica gel. The extract and fractions were then analyzed by UPLC-HRMS with ElectroSpray Ionization (ESI) in positive mode. In addition, bioautography assays were performed to evaluate the antioxidant potential with DPPH and the antifungal potential against the Cladosporium sphaerospermum . The UPLC-HRMS analyzes allowed identifying diterpenes, sterols, faty acids, glycerolipids, derivatives of photosynthetic pigments and carotenoids. Bioautography assays suggested antifungal and antioxidant potential of the organic extract and fractions. Thus, the results suggest that D. menstrualis has pharmacological potential to be explored and that studies on its chemical composition using modern techniques such as UPLC-HRMS can lead to the discovery of new structures and reinforcement of the knowledge of the chemistry of this algae.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"62 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":"135501997","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: 10.21577/1984-6835.20230036
Luiz Gonzaga de França Lopes
{"title":"46th Annual Meeting of the Brazilian Chemical Society. Chemistry: Linking sciences a neutralizing inequalities (100 years of acid-base theories)","authors":"Luiz Gonzaga de França Lopes","doi":"10.21577/1984-6835.20230036","DOIUrl":"https://doi.org/10.21577/1984-6835.20230036","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"66 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91234804","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: 10.21577/1984-6835.20230001
Marcela Cristina de Moraes, Carolina Guimarães de Souza Lima
{"title":"Synthetic Pesticides: Heroes or Villains in the Search for a Hunger-Free Future?","authors":"Marcela Cristina de Moraes, Carolina Guimarães de Souza Lima","doi":"10.21577/1984-6835.20230001","DOIUrl":"https://doi.org/10.21577/1984-6835.20230001","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"615 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76261662","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: 10.21577/1984-6835.20230042
Danielle Cristina Silva Oliszeski, Lucas Augusto Aguiar das Neves, Everson do Prado Banczek, Gideã Taques Tractz, Paulo Rogério Pinto Rodrigues
Corrosion is a spontaneous process that affects the metallic surface, causing environmental and financial damages due to the early replacement of parts. One way to protect metals from corrosion is by applying corrosion inhibitors that act through adsorption on the metal surface, blocking/reducing corrosive processes. Conventional corrosion inhibitors are toxic to the environment and human life, so natural products are tested in order to replace toxic inhibitors. In this work, the aqueous extract of Goji Berry (GB) was tested as a corrosion inhibitor of carbon steel ABNT1020 in H 2 SO 4 0,5 mol L -1 medium. The gravimetric tests showed that the efficiency of the extract diluted at 75% V/V is 98%. The electrochemical results corroborate the data from the gravimetric test, since for the same extract dilution, higher values of resistance to charge transfer and lower values of current density were observed, which proves that the Goji Berry can be used as a corrosion inhibitor of carbon steel in these conditions, as it is reducing corrosive processes.
腐蚀是一种影响金属表面的自发过程，由于零件的过早更换，会造成环境和经济损失。保护金属免受腐蚀的一种方法是使用缓蚀剂，通过在金属表面吸附，阻止/减少腐蚀过程。常规的缓蚀剂对环境和人的生命都是有毒的，因此，为了替代有毒的缓蚀剂，对天然产物进行了测试。本文研究了枸杞水提物(GB)在h2so4,5 mol L -1介质中作为碳钢ABNT1020的缓蚀剂。重量试验表明，75% V/V稀释提取液的萃取效率为98%。电化学结果证实了重量测试的数据，因为在相同的萃取物稀释度下，观察到更高的电荷转移电阻值和更低的电流密度值，这证明了枸杞在这些条件下可以作为碳钢的缓蚀剂，因为它可以减少腐蚀过程。
{"title":"Goji Berry Extract As Inhibitor of ABNT 1020 Carbon Steel Corrosion in H2SO4","authors":"Danielle Cristina Silva Oliszeski, Lucas Augusto Aguiar das Neves, Everson do Prado Banczek, Gideã Taques Tractz, Paulo Rogério Pinto Rodrigues","doi":"10.21577/1984-6835.20230042","DOIUrl":"https://doi.org/10.21577/1984-6835.20230042","url":null,"abstract":"Corrosion is a spontaneous process that affects the metallic surface, causing environmental and financial damages due to the early replacement of parts. One way to protect metals from corrosion is by applying corrosion inhibitors that act through adsorption on the metal surface, blocking/reducing corrosive processes. Conventional corrosion inhibitors are toxic to the environment and human life, so natural products are tested in order to replace toxic inhibitors. In this work, the aqueous extract of Goji Berry (GB) was tested as a corrosion inhibitor of carbon steel ABNT1020 in H 2 SO 4 0,5 mol L -1 medium. The gravimetric tests showed that the efficiency of the extract diluted at 75% V/V is 98%. The electrochemical results corroborate the data from the gravimetric test, since for the same extract dilution, higher values of resistance to charge transfer and lower values of current density were observed, which proves that the Goji Berry can be used as a corrosion inhibitor of carbon steel in these conditions, as it is reducing corrosive processes.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"25 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91501010","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: 10.21577/1984-6835.20230051
Ana Lúcia de Lima, Aline Domingos Gonçalves, Daniella Rodrigues Fernandes, Thiago Custódio dos Santos, Claudio J. A. Mota
{"title":"Chemistry and Circularity","authors":"Ana Lúcia de Lima, Aline Domingos Gonçalves, Daniella Rodrigues Fernandes, Thiago Custódio dos Santos, Claudio J. A. Mota","doi":"10.21577/1984-6835.20230051","DOIUrl":"https://doi.org/10.21577/1984-6835.20230051","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"72 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":"135956728","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: 10.21577/1984-6835.20230050
Debora H. Mafra, Italo R. Garcia, Giovana Vieira, Alessandro Guedes, Caio M. M. De Cordova
Rosmarinus officinalis is a widely studied plant, although its activity against bacteria of the Mollicutes class is lacking. We evaluated the antibacterial potential R. officinalis extracts and fractions against different Mycoplasma species. The most active fractions were the hexane and dichloromethane ones, with MIC of 15.62 µg mL -1 against M. capricolum and the hexane fraction with MIC of 15.62 µg mL -1 against M. pneumoniae . Subfractions were obtained by silica column chromatography, with MIC of 31.25 µg mL -1 against M. capricolum and 62.5 µg mL -1 against M. pneumoniae . Purified subfractions or the isolated compound betulinic acid did not show better activity.
{"title":"In vitro Antimollicute Properties of Rosmarinus officinalis Extract","authors":"Debora H. Mafra, Italo R. Garcia, Giovana Vieira, Alessandro Guedes, Caio M. M. De Cordova","doi":"10.21577/1984-6835.20230050","DOIUrl":"https://doi.org/10.21577/1984-6835.20230050","url":null,"abstract":"Rosmarinus officinalis is a widely studied plant, although its activity against bacteria of the Mollicutes class is lacking. We evaluated the antibacterial potential R. officinalis extracts and fractions against different Mycoplasma species. The most active fractions were the hexane and dichloromethane ones, with MIC of 15.62 µg mL -1 against M. capricolum and the hexane fraction with MIC of 15.62 µg mL -1 against M. pneumoniae . Subfractions were obtained by silica column chromatography, with MIC of 31.25 µg mL -1 against M. capricolum and 62.5 µg mL -1 against M. pneumoniae . Purified subfractions or the isolated compound betulinic acid did not show better activity.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"67 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":"136004365","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: 10.21577/1984-6835.20230055
Alex S. Castro, Valeria Reginatto, Adalgisa R. de Andrade
{"title":"Bioelectrochemical Systems: Microbial Electrolysis Cell for Hydrogen Production","authors":"Alex S. Castro, Valeria Reginatto, Adalgisa R. de Andrade","doi":"10.21577/1984-6835.20230055","DOIUrl":"https://doi.org/10.21577/1984-6835.20230055","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"147 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":"135212241","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: 10.21577/1984-6835.20230024
Maidelen Del Carmen Lozano Guerrero, Marina Duartes Fernandes de Souza Lima, Camila Acorone, Eliane Sloboda Rigobello, P. Valderrama, Yohandra Reyes Torres
{"title":"UV Spectroscopy and Digital Image to Estimate the Antioxidant Capacity and Proline Content of Honeys Produced by Native Bees","authors":"Maidelen Del Carmen Lozano Guerrero, Marina Duartes Fernandes de Souza Lima, Camila Acorone, Eliane Sloboda Rigobello, P. Valderrama, Yohandra Reyes Torres","doi":"10.21577/1984-6835.20230024","DOIUrl":"https://doi.org/10.21577/1984-6835.20230024","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78795011","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: 10.21577/1984-6835.20230021
João Guilherme de Moraes Pontes, Hellen Bertoletti Barbieri, Alan K. Pereira, Marina Ferreira Maximo, Aline Midori Kanashiro, Nelson Arno Wulf, Taicia Pacheco Fill
{"title":"Huanglongbing: What is Known So Far About the Greatest Threat to the World‘s Citrus Industry?","authors":"João Guilherme de Moraes Pontes, Hellen Bertoletti Barbieri, Alan K. Pereira, Marina Ferreira Maximo, Aline Midori Kanashiro, Nelson Arno Wulf, Taicia Pacheco Fill","doi":"10.21577/1984-6835.20230021","DOIUrl":"https://doi.org/10.21577/1984-6835.20230021","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88957203","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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