Pub Date : 2023-01-01DOI: 10.21577/1984-6835.20230037
Rafael B. W. Evaristo, Romulo C. Dutra, Paulo A. Z. Suarez, Grace F. Ghesti
{"title":"Materials from Cellulose: Origin, Synthesis and Applications","authors":"Rafael B. W. Evaristo, Romulo C. Dutra, Paulo A. Z. Suarez, Grace F. Ghesti","doi":"10.21577/1984-6835.20230037","DOIUrl":"https://doi.org/10.21577/1984-6835.20230037","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82808152","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: 10.21577/1984-6835.20230020
Isabelle H. Castro, Fabrício A. A. Oliveira, Carla C. Perez, Marcelle L. F. Bispo
{"title":"Carvacrol and its Semi-synthetic Derivatives as Potential Antibacterial Agents","authors":"Isabelle H. Castro, Fabrício A. A. Oliveira, Carla C. Perez, Marcelle L. F. Bispo","doi":"10.21577/1984-6835.20230020","DOIUrl":"https://doi.org/10.21577/1984-6835.20230020","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82425896","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: 10.21577/1984-6835.20230033
Tainara C. de Assis, Maria L. F. de Azevedo, Adriana de A. S. Felix, Fernanda A. N. G. da Silva, Fernanda V. M. Pontes, Adão B. da Luz B. da Luz, Carla N. Barbato, Aline M. dos S. Teixeira
Brazil has an enormous agricultural potential, but crop yields can be hampered by the lack of some nutrients in soil. Potassium is one of the main macronutrients needed for plant development. The low content of potassium available in soil makes it necessary to apply fertilizers, mainly imported. In order to promote the development of the sector, phlogoptite rock was studied, from Pindobaçu region, Bahia, which contains 8.26% of K 2 O in its chemical composition. Two structural modification methods were applied. The first was the samples calcination with 10% w/w of CaO at different temperatures. The second involved mechanochemical activation by 10% of CaO for 30, 60 and 90 min followed by calcination at different temperatures. In both cases, the samples were submitted to extraction tests with citric acid 0.1 mol.L -1 . At the end of the tests, it was observed an increase in the nutrient solubility, going from 0.450 g.L -1 in the unprocessed rock to 4.14 g.L -1 in the sample calcined at 1,200 °C after addition of 10% w/w of CaO and to 25.1 g.L -1 in the sample subjected to mechanochemical activation for 90 minutes with 10% w/w of CaO, calcined at 1,000 °C.
{"title":"Analysis of Structural Modifications of Phlogoptite from Bahia/Brazil as an Alternative Source of Potassium in Agriculture","authors":"Tainara C. de Assis, Maria L. F. de Azevedo, Adriana de A. S. Felix, Fernanda A. N. G. da Silva, Fernanda V. M. Pontes, Adão B. da Luz B. da Luz, Carla N. Barbato, Aline M. dos S. Teixeira","doi":"10.21577/1984-6835.20230033","DOIUrl":"https://doi.org/10.21577/1984-6835.20230033","url":null,"abstract":"Brazil has an enormous agricultural potential, but crop yields can be hampered by the lack of some nutrients in soil. Potassium is one of the main macronutrients needed for plant development. The low content of potassium available in soil makes it necessary to apply fertilizers, mainly imported. In order to promote the development of the sector, phlogoptite rock was studied, from Pindobaçu region, Bahia, which contains 8.26% of K 2 O in its chemical composition. Two structural modification methods were applied. The first was the samples calcination with 10% w/w of CaO at different temperatures. The second involved mechanochemical activation by 10% of CaO for 30, 60 and 90 min followed by calcination at different temperatures. In both cases, the samples were submitted to extraction tests with citric acid 0.1 mol.L -1 . At the end of the tests, it was observed an increase in the nutrient solubility, going from 0.450 g.L -1 in the unprocessed rock to 4.14 g.L -1 in the sample calcined at 1,200 °C after addition of 10% w/w of CaO and to 25.1 g.L -1 in the sample subjected to mechanochemical activation for 90 minutes with 10% w/w of CaO, calcined at 1,000 °C.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82162100","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: 10.21577/1984-6835.20230028
Lucas Franco Wrege, R. Marangoni
This article characterizes and evaluates the use of primary sludge from the paper industry as a filler in poly(lactic acid) polymer. To improve the matrix/filler interaction, chemical treatments were carried out in the primary sludge, using alkaline sodium hydroxide solution, nitric acid solution and citric pectin. The composites were made with 1, 3 and 5% (wt/wt%). The composites were characterized by thermogravimetry (TGA) and differential scanning calorimetry (DSC), X-ray diffraction (XRD), vibrational infrared spectroscopic analysis (FTIR), scanning electron microscopy (SEM) and mechanical tensile and flexure tests. Thermal analyzes indicate a reduction of up to 8.35% in the decomposition temperature of the composite. FTIR analysis indicated that there was no molecular interaction between polymer and filler. The morphological analyzes using SEM, demonstrated a better interfacial adhesion of the filler with the polymer in the sludge treated with pectin. The mechanical tensile tests showed an improvement in the maximum tensile stress of up to 1.77% and 5.48% in the modulus of elasticity. The maximum flexural strength had an increase of up to 5.76% in relation to the unloaded PLA and the flexural modulus had an increase of up to 10.42%.
{"title":"Primary Sludge from Paper Processing as Filler in Poly(lactic acid) Composite: Physical, Thermal and Mechanical Properties","authors":"Lucas Franco Wrege, R. Marangoni","doi":"10.21577/1984-6835.20230028","DOIUrl":"https://doi.org/10.21577/1984-6835.20230028","url":null,"abstract":"This article characterizes and evaluates the use of primary sludge from the paper industry as a filler in poly(lactic acid) polymer. To improve the matrix/filler interaction, chemical treatments were carried out in the primary sludge, using alkaline sodium hydroxide solution, nitric acid solution and citric pectin. The composites were made with 1, 3 and 5% (wt/wt%). The composites were characterized by thermogravimetry (TGA) and differential scanning calorimetry (DSC), X-ray diffraction (XRD), vibrational infrared spectroscopic analysis (FTIR), scanning electron microscopy (SEM) and mechanical tensile and flexure tests. Thermal analyzes indicate a reduction of up to 8.35% in the decomposition temperature of the composite. FTIR analysis indicated that there was no molecular interaction between polymer and filler. The morphological analyzes using SEM, demonstrated a better interfacial adhesion of the filler with the polymer in the sludge treated with pectin. The mechanical tensile tests showed an improvement in the maximum tensile stress of up to 1.77% and 5.48% in the modulus of elasticity. The maximum flexural strength had an increase of up to 5.76% in relation to the unloaded PLA and the flexural modulus had an increase of up to 10.42%.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72725478","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: 10.21577/1984-6835.20230026
Stefania Mora Güezguán, Adalin Cezar Morais de Aguiar, Renata Pereira Lopes, A. F. Oliveira, A. D. da Silva
{"title":"Sorption and Desorption of Cyantraniliprole in Soils with Different Attributes","authors":"Stefania Mora Güezguán, Adalin Cezar Morais de Aguiar, Renata Pereira Lopes, A. F. Oliveira, A. D. da Silva","doi":"10.21577/1984-6835.20230026","DOIUrl":"https://doi.org/10.21577/1984-6835.20230026","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"166 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79517787","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: 10.21577/1984-6835.20230053
Emerson Leandro Silva, Maria L. D. C. Silveira, Angelo R.F. Pipi, Marina Piacenti Silva, Aroldo G. Magdalena
because of its direct effects on health and the environment. To help in mitigate this problem, in this
{"title":"Metal Removal Using Fe3O4-Chitosan Nanoparticles for Environmental Applications","authors":"Emerson Leandro Silva, Maria L. D. C. Silveira, Angelo R.F. Pipi, Marina Piacenti Silva, Aroldo G. Magdalena","doi":"10.21577/1984-6835.20230053","DOIUrl":"https://doi.org/10.21577/1984-6835.20230053","url":null,"abstract":"because of its direct effects on health and the environment. To help in mitigate this problem, in this","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"113 10 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":"136257742","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: 10.21577/1984-6835.20230054
Maria Cristina Marcucci, Adriana Melo, Mara Junqueira Carneiro, Paulo Cesar Pires Rosa
Propolis is a resin produced by bees from buds and exudates of plant sources. Its use is increasing exponentially, especially after reports of its use as an adjuvant in the therapy against COVID-19. In this scenery, many products can be found on the market, which do not have the minimum quality characteristics established by government agencies
{"title":"Investigation of Quality of Propolis Acquired in Minas Gerais","authors":"Maria Cristina Marcucci, Adriana Melo, Mara Junqueira Carneiro, Paulo Cesar Pires Rosa","doi":"10.21577/1984-6835.20230054","DOIUrl":"https://doi.org/10.21577/1984-6835.20230054","url":null,"abstract":"Propolis is a resin produced by bees from buds and exudates of plant sources. Its use is increasing exponentially, especially after reports of its use as an adjuvant in the therapy against COVID-19. In this scenery, many products can be found on the market, which do not have the minimum quality characteristics established by government agencies","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"2012 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":"136304942","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: 10.21577/1984-6835.20230014
Julia Rosa Menezes, Maria Eduarda Candido Thedy, Mylena Mendes Gularte, Juliano Braun Azeredo
{"title":"Recent Advances in the Application of Green Solvents Derived from Natural Sources in Organic Synthesis","authors":"Julia Rosa Menezes, Maria Eduarda Candido Thedy, Mylena Mendes Gularte, Juliano Braun Azeredo","doi":"10.21577/1984-6835.20230014","DOIUrl":"https://doi.org/10.21577/1984-6835.20230014","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91117604","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: 10.21577/1984-6835.20230019
Natália Felix Alves, Dayane Castro Ribeiro, H. Mannochio-Russo, Suzana Aparecida Silva Queiroz, G. Zocolo, V. da Silva Bolzani, M. Valli
{"title":"Advanced Glycation End Products Inhibitors from Talisia esculenta","authors":"Natália Felix Alves, Dayane Castro Ribeiro, H. Mannochio-Russo, Suzana Aparecida Silva Queiroz, G. Zocolo, V. da Silva Bolzani, M. Valli","doi":"10.21577/1984-6835.20230019","DOIUrl":"https://doi.org/10.21577/1984-6835.20230019","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74734899","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: 10.21577/1984-6835.20230023
Vanessa Nascimento, H. Mannochio-Russo, A. Pilon, Aldo Sena de Oliveira
{"title":"The Science Developed by Young Researchers in Brazil – Part 1","authors":"Vanessa Nascimento, H. Mannochio-Russo, A. Pilon, Aldo Sena de Oliveira","doi":"10.21577/1984-6835.20230023","DOIUrl":"https://doi.org/10.21577/1984-6835.20230023","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":"83120277","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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