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Revista Virtual de Química最新文献

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Catalytic Hydrogenation Reactions of Lignocellulosic Biomass-derived Compounds as a Strategy to Obtain Value-added Products 木质纤维素生物质化合物的催化加氢反应是获得高附加值产品的一种策略
Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230016
Daniel G. S. Quattrociocchi, Thiago de M. Lima
{"title":"Catalytic Hydrogenation Reactions of Lignocellulosic Biomass-derived Compounds as a Strategy to Obtain Value-added Products","authors":"Daniel G. S. Quattrociocchi, Thiago de M. Lima","doi":"10.21577/1984-6835.20230016","DOIUrl":"https://doi.org/10.21577/1984-6835.20230016","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":"75734113","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}
引用次数: 0
Solar Light as the Energy Source for the Generation of Clean and Renewable Fuel: A View on the Photoelectrocatalytic Water Splitting 太阳能作为清洁和可再生燃料的能源——光电催化水分解的观点
Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230043
Luis Eduardo C. S. Machado, Igor M. Brito, João Victor S. B. Mello, Mauricio A. Melo
{"title":"Solar Light as the Energy Source for the Generation of Clean and Renewable Fuel: A View on the Photoelectrocatalytic Water Splitting","authors":"Luis Eduardo C. S. Machado, Igor M. Brito, João Victor S. B. Mello, Mauricio A. Melo","doi":"10.21577/1984-6835.20230043","DOIUrl":"https://doi.org/10.21577/1984-6835.20230043","url":null,"abstract":".","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72883364","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}
引用次数: 0
“Chemistry among Us“, by João Martins Teixeira: A Short Analysis and Transcription of a Pioneer Text on the History of Chemistry (Teaching) in Brazil 《化学在我们中间》，作者jo<e:1>奥·马丁斯·特谢拉:对巴西化学史(教学)先驱文本的简短分析和转录
Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230035
Fabiola R. O. do Nascimento, Jaqueline P. Rosado, Rafael C. Mori
{"title":"“Chemistry among Us“, by João Martins Teixeira: A Short Analysis and Transcription of a Pioneer Text on the History of Chemistry (Teaching) in Brazil","authors":"Fabiola R. O. do Nascimento, Jaqueline P. Rosado, Rafael C. Mori","doi":"10.21577/1984-6835.20230035","DOIUrl":"https://doi.org/10.21577/1984-6835.20230035","url":null,"abstract":"meta-historiographical","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":"90371799","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}
引用次数: 0
Novel Tritepene Saponins from Mandacaru (Cereus jamacaru) 猕猴桃新三萜皂苷
Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230018
Analu F. de S. Brito, Thalisson A. de Souza, Laiane C. O. Pereira, César A. G. Dantas, Yuri M. do Nascimento, Maria de F. Agra, Alecksandra V. de Lacerda, R. Braz-Filho, Marcelo S. da Silva, Josean F. Tavares, Lucas S. Abreu
{"title":"Novel Tritepene Saponins from Mandacaru (Cereus jamacaru)","authors":"Analu F. de S. Brito, Thalisson A. de Souza, Laiane C. O. Pereira, César A. G. Dantas, Yuri M. do Nascimento, Maria de F. Agra, Alecksandra V. de Lacerda, R. Braz-Filho, Marcelo S. da Silva, Josean F. Tavares, Lucas S. Abreu","doi":"10.21577/1984-6835.20230018","DOIUrl":"https://doi.org/10.21577/1984-6835.20230018","url":null,"abstract":"Mandacaru ( Cereus jamacaru ) is a Cactaceae species widely used as food and for medicinal purposes in Brazilian’s northeastern region. Nevertheless, only a few alkaloids were identified from this plant. Hence, the knowledge regarding their chemical diversity remains scarce. In view of the importance of mandacaru for Brazilian semiarid region this work aimed to reinvestigate the chemical composition of C. jamacaru applying modern phytochemical tools. To achieve this main goal, the extract of the cladodes was obtained and chromatographed over Sephadex LH-20. After that, the main fractions were analyzed by High Pressure Liquid Chromatograph (HPLC) and Mass Spectrometry (MS). These analyses combined allowed the detection of two saponins, jamacarusides A and B, which were isolated and fully characterized based on 1D and 2D Nuclear Magnetic Resonance (NMR) and high resolution mass spectrometry (HRMS) data, as well as their fragmentation patterns obtained from HPLC-ESI-MS/MS. In summary, this work contributed to extend the current knowledge about the chemical composition of Cereus jamacaru and cactaceae family.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81964178","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}
引用次数: 0
The Science Developed by Young Researchers in Brazil – Part 2 巴西年轻研究人员开发的科学-第2部分
Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230056
Vanessa Nascimento, Helena Mannochio-Russo, Alan Cesar Pilon, Aldo Sena de Oliveira
{"title":"The Science Developed by Young Researchers in Brazil – Part 2","authors":"Vanessa Nascimento, Helena Mannochio-Russo, Alan Cesar Pilon, Aldo Sena de Oliveira","doi":"10.21577/1984-6835.20230056","DOIUrl":"https://doi.org/10.21577/1984-6835.20230056","url":null,"abstract":"","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"27 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":"135312415","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}
引用次数: 0
Synthesis and Characterization of Fluorinated Derivatives of Chalcona Chalcona氟化衍生物的合成与表征
Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230040
Milena Araújo Agra, Jaqueline Evangelista de Queiroz, Plínio Lázaro Faleiro Naves, Gilberto Lúcio Benedito de Aquino
{"title":"Synthesis and Characterization of Fluorinated Derivatives of Chalcona","authors":"Milena Araújo Agra, Jaqueline Evangelista de Queiroz, Plínio Lázaro Faleiro Naves, Gilberto Lúcio Benedito de Aquino","doi":"10.21577/1984-6835.20230040","DOIUrl":"https://doi.org/10.21577/1984-6835.20230040","url":null,"abstract":"Chalcones are natural compounds formed by an α , β -unsaturated carbonyl system that joins two aromatic rings forming the central core of many biologically important compounds. They are the biogenetic precursors of flavonoids and isoflavonoids found abundantly in plants. The chalcone class is of great interest not only from a biosynthetic perspective","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"176 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":"136137195","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}
引用次数: 0
Pseudopotential Scalar Relativistic CCSD(T) and DFT Study of Spectroscopic Constants, Polarity and Dipole Moment in Diatomic Compounds Fr2 and FrX (X=F, Cl, Br, I or At) 双原子化合物Fr2和FrX (X=F, Cl, Br, I或At)光谱常数、极性和偶极矩的伪势标量相对论CCSD(T)和DFT研究
Revista Virtual de Química Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220046
Heracles P. Wanzeler, Luiz G. M. de Macedo
{"title":"Pseudopotential Scalar Relativistic CCSD(T) and DFT Study of Spectroscopic Constants, Polarity and Dipole Moment in Diatomic Compounds Fr2 and FrX (X=F, Cl, Br, I or At)","authors":"Heracles P. Wanzeler, Luiz G. M. de Macedo","doi":"10.21577/1984-6835.20220046","DOIUrl":"https://doi.org/10.21577/1984-6835.20220046","url":null,"abstract":"This is an open-access article distributed under the terms of the Creative Commons Attribution License. Rev. Virtual Quim., 2022, no prelo, 1-6 ©2021 Sociedade Brasileira de Química aUniversidade do Estado do Pará, Campus II, Tv. Perebebuí 2623, Marco, CEP 66087-662, Belém-PA, Brasil. bUniversidade Federal de São João del Rei, Campus Centro Oeste dona Lindu CCO, Rua Sebastião Gonçalves Coelho, 400 Chanadour, CEP 35501-296, Divinópolis-MG, Brasil","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73551548","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}
引用次数: 0
Films and Edible Coatings in the Development of Biodegradable Packaging: Sustainable and Eco‑friendly Alternatives 生物可降解包装发展中的薄膜和食用涂层:可持续和生态友好的替代品
Revista Virtual de Química Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220084
Cassia Cristina Fernandes, Mayker Lazaro Dantas Miranda
{"title":"Films and Edible Coatings in the Development of Biodegradable Packaging: Sustainable and Eco‑friendly Alternatives","authors":"Cassia Cristina Fernandes, Mayker Lazaro Dantas Miranda","doi":"10.21577/1984-6835.20220084","DOIUrl":"https://doi.org/10.21577/1984-6835.20220084","url":null,"abstract":"can invest in them. Findings in the literature led to the discussion of the development of some types of films made from biopolymers, additives and natural bioactive compounds. Researchers bet on films and edible coatings not only because their physico-chemical characteristics are effective to protect food but also because their development is easy. Finally, another strength is that the raw material needed to develop them, such as starch, is highly available.","PeriodicalId":21315,"journal":{"name":"Revista Virtual de Química","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75193046","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}
引用次数: 0
Optoelectronic Nose: A Powerful Tool for the Discrimination of Volatile Mixtures 光电鼻:鉴别挥发性混合物的有力工具
Revista Virtual de Química Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220137
Bárbara Cristina Dias, João Flávio da Silveira Petruci
{"title":"Optoelectronic Nose: A Powerful Tool for the Discrimination of Volatile Mixtures","authors":"Bárbara Cristina Dias, João Flávio da Silveira Petruci","doi":"10.21577/1984-6835.20220137","DOIUrl":"https://doi.org/10.21577/1984-6835.20220137","url":null,"abstract":"","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":"75665400","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}
引用次数: 0
Determination of Ascorbic Acid in Long Life Juices by Cyclic Voltammetry Using External Standards and Standard Addition Methods: An Experimental Proposal for Teaching Analytical Instrumental Chemistry 外标法和标准加入法循环伏安法测定长寿命果汁中的抗坏血酸——分析仪器化学教学实验方案
Revista Virtual de Química Pub Date : 2022-01-01 DOI: 10.21577/1984-6835.20220048
Vinícius N. Silveira, Nayara Caroline M. Carvalho, Jéssica A. Oliveira, L. D. da Silva, Valéria A. Alves
{"title":"Determination of Ascorbic Acid in Long Life Juices by Cyclic Voltammetry Using External Standards and Standard Addition Methods: An Experimental Proposal for Teaching Analytical Instrumental Chemistry","authors":"Vinícius N. Silveira, Nayara Caroline M. Carvalho, Jéssica A. Oliveira, L. D. da Silva, Valéria A. Alves","doi":"10.21577/1984-6835.20220048","DOIUrl":"https://doi.org/10.21577/1984-6835.20220048","url":null,"abstract":"Ascorbic acid (vitamin C) is essential to our body and can be found in leafy vegetables, legumes and fruits, as well as in natural and industrialized juices. The concentration of vitamin C present in long life juices is normally informed by the manufacturer on the package label. The objective of this work was to use an electroanalytical technique, cyclic voltammetry, to determine the concentration of vitamin C in long-life juices. From the dilution of a 100 mmol L -1 stock solution of ascorbic acid, the calibration curves were prepared by the method of external standards or of standard addition. Cyclic voltammograms (CVs) were recorded from 0 to +1.0 V, with v = 50 mV s -1 . The solutions were prepared in the presence of KCl 0.34 mol L -1 as supporting electrolyte, including the samples. Measurements were taken in triplicate. It was found that vitamin C is present in all juice brands analyzed, and in some cases in a concentration very different from the value informed on the package label by the manufacturer. The present work showed the viability of using the CV technique for the determination of vitamin C in a food product, which is relevant for the teaching of electrochemistry.","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":"74626897","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}
引用次数: 0
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