Revista Virtual de Química最新文献

Halogen (and Species) Determination in Surface Water by Inductively Coupled Plasma Mass Spectrometry and Ion Chromatography 电感耦合等离子体质谱法和离子色谱法测定地表水中的卤素(及其种类)

Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230027

Ana Luiza G. Mendes, Gustavo R. Bitencourt, Gabrielle D. Iop, Sindy R. Krzyzaniak, Darliana M. Souza, Paola A. Mello

{"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}

引用次数: 0

Preparation of Polymeric Membranes and Application as an Interdisciplinary Investigative Proposal for Teaching Chemistry 高分子膜的制备及其在化学教学中的应用

Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230030

Gabriel B. de Carvalho, Pedro E. Costa, Luis C. de Morais, D. Pasquini

引用次数: 0

Biginelli Reaction under Chemically Friendly and in Parallel Conditions: a Practical Class of Organic Synthesis for Medicinal Chemistry, Chemistry and Pharmacy Courses 化学友好和平行条件下的比奇内利反应:药物化学、化学和药学课程有机合成实践课

Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230057

Rômulo Faria Santos Canto, Itamar Luís Gonçalves, Mário Alf da Rosa, Vera Lucia Eifler-Lima

引用次数: 0

Bioactive Hexane Extracts from Piper aduncum and Xylopia aromatica Against Bacterial Strains which Cause Food Poisoning 对引起食物中毒的细菌菌株具有生物活性的夹竹桃和木香己烷提取物

Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230034

Valdenir P. Morais, Cassia C. Fernandes, Carlos H. G. Martins, Antônio E. M. Crott, Mayker L. D. Miranda

{"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}

引用次数: 0

The Approach to Aromatherapy and Essential Oils Extraction as a Generating Theme for Teaching Organic Chemistry 芳香疗法与精油萃取作为有机化学教学生成主题的探讨

Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230032

Adriana da Veiga Torres, Jhully Rangel de Oliveira Gonçalves, Rafael Pinheiro Caetano Damasceno, Juliana Baptista Simões

{"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}

引用次数: 0

Can the Responsible use of Artificial Intelligence Assist in the Resurgence of Brazilian Scientific Production? 负责任地使用人工智能能否帮助巴西科学生产的复苏?

Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230046

Ricardo Soares

引用次数: 0

Effectiveness of Bacillus sp. SMIA-2 Cellulases as an Additive in Detergent Formulations 芽孢杆菌sp. SMIA-2纤维素酶作为洗涤剂配方添加剂的有效性

Revista Virtual de Química Pub Date : 2023-01-01 DOI: 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

引用次数: 0

Strategies for the Synthesis of Monohalogenated Analogues of Juglone: Unlocking the Potential of Regiospecific Synthesis Methodologies 核桃酮单卤化类似物的合成策略:释放区域特异性合成方法的潜力

Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230045

Leonardo G. C. de Moraes, David R. da Rocha

引用次数: 0

Storage of Piper umbellatum L. Leaves Interferes with the Quality of the Essential Oil 伞形花椒叶贮存对其精油质量的影响

Revista Virtual de Química Pub Date : 2023-01-01 DOI: 10.21577/1984-6835.20230052

Rosilene A. de Oliveira, Ana Carolline S. Gonçalves, Daniel de C. Lima, Fernando F. de Oliveira

引用次数: 0

Surface Modification of NiTi Shape Memory Alloys with Chitosan-Based Coatings: A Brief Literature Review. 壳聚糖基涂层改性NiTi形状记忆合金的研究进展。

Revista Virtual de Química Pub Date : 2023-01-01 DOI: 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

引用次数: 0