Lucas Souza PratesI; Silvio CunhaI,II,*
Stereoselective synthesis of α-aryl enaminones was developed by TfOH-promoted cascade reactions via 1,3-dipolar cycloaddition of alkyl azides with dibenzylidene ketones, aziridine formation, and 1,2-aryl migration. Starting materials are readily available and TfOH is easy to handle.
Mario Hurtado CotilloI,II; José M. López NietoII; Benjamín SolsonaIII; Rosario Sun KouIV; Gino PicassoI,*
An alumina supported NiNb metal oxide prepared from hydrothermal method was successfully applied for ethane oxidative dehydrogenation (ODH) to ethylene. The hydrothermal method led to the feasible formation of active sites over the NiNb sample, which presented the highest selectivity toward ethylene due to the special nature of surface oxygen with low reducible sites.
Le Thi Thanh TrucI; Nguyen Ngoc Huyen TranI; Nguyen Van ThoiI; Nguyen Van HueII; Nguyen Thi Hong AnhIII,*;
Tran Nguyen Minh AnI,*
Compounds 2 and 4 are novel via bromination. Compound 2 has inhibited well against Staphylococcus aureus and Bacillus cereus bacteria with minimal inhibitory concentration (MIC) values of 13.20 and 6.6 µM, respectively, and 2 inhibited stronger than parent compound 1.
Edvando S. TelesI; Lucas G. da CostaI,*; Waldomiro Borges NetoI; Ricardo R. SoaresII
Multivariate curve resolution is used to quantify the content of palm oil methyl biodiesel in diesel blends. This tool recovers the pure profiles of analytes in complex mixtures, managing to determine the concentration of the species of interest even in the presence of interferents.
Yan WangI,II; Qiong WuI; Van P. VuII; Beom S. ParkII; Shuo MaII; Heng Q. ZhangI,*
KBiO3 and BiOCl form the p-n heterojunction that makes the photo-induced electrons and holes efficiently separated and the recombination of electron-hole pairs hindered under visible light. Therefore, the photocatalytic effect can be greatly improved.
Qianjun LeI; Shengfei YuI,*; Wusheng LuoII
By using TiCl4 as the titanium source, we systematically determined the degree of hydrolysis of Ti4+ by adding triethanolamine (C6H15NO3) dropwise. By collecting solutions at different time points and performing UV spectroscopy analysis, we plotted the Ti4+ concentration over time. This study not only reveals the hydrolysis behavior of Ti4+ under different conditions, but also provides a theoretical basis and experimental method for the precise control of the hydrolysis process of Ti4+. Such research results have important guiding significance for the preparation and application of titanium-based materials.
Giovanna C. A. FerreiraI; Patricia D. SantosII; Marcela S. ZangirolamiII; Alisson L. FigueiredoII; Cleverton S. FernandesII; Geovane A. R. da SilvaII; Ernani A. BassoII; Oscar O. SantosI,II,*
Comparison of fatty acids and triacylglycerols in human, cow, and goat milk as a basis for supplementation in infant formulas.
Karla Mayara Arguelles SimõesI,II; Giullia Bertrand MarçanoII,III; Fernanda Arruda Nogueira Gomes SilvaIII; Luiz Carlos BertolinoII; Maira da Costa de Oliveira LimaIV; Lídia YokoyamaI
A new pelletization proposal allowed, from the solid state synthesis between the clay mineral palygorskite, lignin (paper pulp residue) and WAX®, the application of the composite in environmental remediation, removing 88.36% of PbII ions in 60 min and in batch system.
Kelly F. P. LaeberI,*; Leticia M. PratesII; Leonardo BaptistaIII; Maurício T. M. CruzI
The reinjection of CO2 into oil reservoirs as a mitigation project can influence asphaltene molecules. These structures can aggregate, precipitate, and cause several problems in the oil industry.
Renan Alves da Silva; Sergio Machado Corrêa*
Vehicles emit air pollutants, such as volatile organic compounds (VOC) and nitrogen oxides, which in the presence of sunlight, lead to the ozone formation. As ozone is the main product, it is a parameter used to control vehicular emission.
Un Hwa ChoeI,*; Jong Hyon ChoeII; Yong Jun KimI
By injecting ozone microbubbles, it can effectively remove Fe2+ in CO2-rich mineral water to prevent sediment from occurring during storage and increase shelf life.
Patricia A. de SouzaI,*; William Z. de MelloII
Bulk precipitation samples collected at two coastal urban sites (downtown Niterói and APA Guapimirim) in the Metropolitan Region of Rio de Janeiro and at two montane Atlantic Forest (at 400 and 1000 m altitude) areas within Serra dos Órgãos National Park (PARNASO) were investigated for inorganic ions.
Arthur Felipe Burg; Graciela Marini Hiedrich; Ana Barbosa Viana; Valderi Luiz Dressler
Chromium VI is a highly toxic species and must be controlled in organic fertilizers. A simple spectrophotometric method was developed and validated for its determination.
Luyu WangI,*; Jia SongII; Chunyang YuIII
The quartz crystal microbalance (QCM) gas sensor based on polyaniline nanofibers has ultra-sensitive moisture-resistant detection capability for benzene, toluene, ethylbenzene, and xylene (BTEX) vapors.
Elizabeth A. M. KajiyaI,*; Andre R. PimentaII; Valter S. FelixII; Nilton T. R. JuniorIII; Roberto da S. LiarthIII; Claudia R. F. de SouzaIII; Márcia BarbosaIV; Lucas C. MunizII; Robson B. dos SantosII; Leandro O. PereiraII; Elicardo A. S. GonçalvesI; Renato P. de FreitasII,*
This graphical abstract shows the ultraviolet-induced visible luminescence (UVL), infrared (IR) images and elemental maps Pb-L, Fe-K and Zn-K obtained in investigation of the painting "Costureiras", by Tarsila do Amaral, from 1950, oil on canvas, measuring 73.3 × 100.2 cm from MAC-USP Museum Collection.
Igor L. de PaulaI; Carolina N. CunhaII; Caroline B. A. PintoI; Júlia M. P. M. VitralI; Paola F. LazzariniI; Juliana de C. da CostaII; Guilherme M. TavaresIII; Ítalo T. PerroneII; Luiz Fernando C. de OliveiraI; Rodrigo StephaniI,*
This study sought to develop an HPLC (high performance liquid chromatography) methodology to quantify the two main protein fractions of whey protein concentrates (WPC) in liquid and powdered form before and after microparticulation and at various protein concentrations. Additionally, we calculated the denaturation percentage of each protein fraction.
Klauber Viana CardosoI; Darlan Coutinho dos SantosII; Jorge Mauricio DavidI,*
Chalcones, triterpenes, sitostenone, and very-long fatty acids were isolated from bioactive extracts of Bowdichia virgilioides’ roots.
Maria C. da S. SauthierI, II,*; Walter N. L. dos SantosI, III; Jamile da C. CaldasI; Isaac M. de J. SilvaI; José J. C. L. de Souza JúniorI;
Lourdes C. de Souza NetaI; Luiz A. F. RibeiroI
High performance liquid chromatography-diode array detector (HPLC-DAD) and spectrophotometric methods were applied to determine bioactive phenolic compounds in Schinus terebinthifolia Raddi fruits. Antioxidant and antimicrobial activity were assessed. Metals were also determined by flame atomic absorption spectrometry (FAAS).
Livia Deris PradoI,II; Isabella Costa Ramos de CastroI; Karen Medeiros GonçalvesI; Thamyrys Barreto ArgentaIII; Leandro TassoIII; Helvécio Vinícius Antunes RochaI,II,*
It was demonstrated a process improvement in the wet milling of efavirenz, increasing the concentration of solids in the suspension, and incorporating the powder into dispersible tablets.
Vitoria B. Messias; Regina M. Takeuchi; André L. Santos*
High concentrations of ammonia in natural waters indicate pollution and environmental degradation. In this study, we propose a simple, rapid, and cost-effective voltammetric method for quantifying NH3 in water samples using a non-modified Pt electrode.
Syeda Abida EjazI,*; Aisha A. AlsfoukII; Tahira ShamimIII; Laila SumreenIV; Hafiz Kashif MahmoodI; Chen LiIV
7-Chloro-1-ethyl-6-fluoro-3-(5-oxo-4-phenyl-4,5-dihydro-1H-1,2,4-triazol-3-yl)quinolin-4(1H)-one (11e) as a potential multi-targeting agent against cholinestaeses (AChE and BChE) and monoamine oxidases (MAO-A and MAO-B) for the treatment of Alzheimer’s disease.
Lara Beatriz Pereira de LimaI; Shirlene Kelly Santos CarmoII,*; José Mariano da Silva NetoII,; Stefani da Silva de MeloI; Flávio Luiz Honorato da SilvaIII
The pineapple peel biomass was subjected to chemical pretreatment experiments of organosolv delignification, and acid pretreatment with sulfuric acid (H2SO4) and hydrochloric acid (HCl), to enable the hydrolysis of hemicellulose and cellulose and obtain the fermentable sugars.
Marta S. D. FreitasI; Rodrigo M. BatistaII; Andressa R. C. CostaI,*; Ozelito P. de Amarante JuniorI,II,; Teresa C. R. S. FrancoIII; Gilberto FillmannII; Natilene M. BritoI
Silicone rubbers were tested as passive samplers to determine the presence of third-generation antifouling biocides, commonly used as reinforcing agents in underwater paints. The chromatographic conditions provided an efficient separation and quantification of the analytes.
Yuli Marcela Henao-HoyosI,II,*; Marco Antonio Márquez-GodoyII; José G. CarriazoI
Synthesis of Fe-TiO2 from natural ilmenite and its application in the photodecomposition of aqueous cyanide (FeTiO3).
Shunjie LiI,*; Jian ChenII
Compound 1•+, which is the largest reported monoradical cation of thiophene-modified pyrene, has broad application prospects in the fields of semiconductors and optoelectronic materials.
Alfredo de Jesús-González; Norma Aurea Rangel-Vázquez*
Analysis of the adsorption process of different pesticides using functionalized single-walled carbon nanotubes (SWCNT) using the AMBER/PM3 hybrid method and Monte Carlo simulation.
Yongshun LiangI,II; Chaojie LeiI,II; Lang XuI,II; Ya LiI,II; Ting YangI,II; Junming GuoI,II; Mingwu XiangI,II; Wei BaiI,II,*
Expired amoxicillin and penicillin V potassium tablets form a protective film on the surface of the lowcarbon steel, reducing the direct contact between the steel and the corrosion solution, thus alleviating the corrosion of the steel.
Neuton T. Vasconcelos JuniorI,*; Paulo P. AraújoII; Kelson C. F. FaialI; Bruno S. CarneiroI
Interpretation of physical-chemical and chemical shallow groundwater quality for human consumption, using statistical techniques.
Wendel C. de SousaI; Josemar G. Oliveira FilhoI; Alana K. PereiraII; Samara S. da SilvaIII; Giulia KassabIV; Marcela ChristofoliI; Cassia C. F. AlvesI; Andreia P. MatosV; Moacir Rossi ForimII; Cristiane de M. CazalVI,*
Volatile organic compounds extracted of Protium ovatum were collected in five different vegetation physiognomies of the Brazilian Cerrado and analyzed by GC-MS (gas chromatography coupled to mass spectrometry). Posteriorly, these were tested against Staphylococcus aureus, Escherichia coli, and Candida albicans. Chemometric tools were used.
Fernando Luiz LavoieI,*; Marcelo KobelnikI; Clever Aparecido ValentinI; Érica Fernanda da Silva TirelliII; Maria de Lurdes LopesIII; Jefferson Lins da SilvaI
In exposed geomembrane applications, polyethylene (PE) is in contact with ultraviolet (UV) radiation, and the degradation is led by photo-oxidation with several free radical reactions.
Thifanny T. P. da SilvaI; Ademar D. V. MáquinaI,II,*; Anízia F. F. DuransI; Lucas G. da CostaI; Frederico G. PintoIII;
Timothy J. GarrettIV; Waldomiro Borges NetoI
PSI-MS spectra of urine samples from control individuals and patients with prostate cancer used in multivariate calibration with orthogonal correction to develop the OPLS-DA model.
Ursula Paôla Rudolph de MatosI,II; Luana Dezingrini LopesI; Ana Paula ScheerenI; Juliana Maria Forain Miolo SchneiderIII;
Adailton João BortoluzziIV; Helio Gauze BonacorsoV; Itamar Luís GonçalvesVI,*; Aloir Antonio MerloI,*
Mole fraction of 6 and 9 determined through the intersection of the graphs obtained by solving the Schröeder-van Laar equation for the formulation of the binary mixture UR10. Background image is the nematic texture of sample UR10 by polarized optical microscopy.
Paula M. VeigaI; Ayres G. DiasII; Cláudia de O. VelosoI; Cristiane A. HenriquesI,*
HBeta, USY, and HZSM-5 zeolites produce solketal from glycerol and 2,2-DMP with higher yield under mild conditions.
Camilo Aurélio Brandão CrisóstomoI; Fernanda Barbosa DamacenoI; Luele Ribeiro de Sousa BarbosaI; Jânio Santos AlmeidaI; Walker Vinicius Ferreira do Carmo BatistaI; Andréa Renata MalaguttiII; João Paulo de MesquitaIII; Juliana Arriel TorresIV;
Gustavo Duran IgaIV; Caue Ribeiro de OliveiraIV; Roberto Ananias RibeiroV; Henrique A. J. L. MourãoI,VI,*
In this paper, we describe the hydrothermal synthesis of Nb2O5 and their application in photodegradation of dyes (methylene blue (MB) and indigo carmine (IC)) and photoesterification of free fatty acids (FFA) which are present in waste cooking oil (WCO).
Laís D. S. M. K. MeloI; Cláudio T. CarvalhoI; Pedro Enrique Sánchez JiménezII,III; Thiago SequinelI; Antonio PerejónII,III;
Luis Allan Pérez MaquedaII; Tiago A. D. ColmanI,*
The synthesis of the coordination complex between aceclofenac and lanthanum or gadolinium ions results in stable compounds with potential medical and catalytic applications. Thermoanalytical characterization reveals information about the structure and thermal stability, while thermokinetic analysis investigates reaction rates, decomposition, and phase transitions, contributing to an overall understanding of the thermal behavior of the complex.
Micaelly S. OliveiraI; Otemberg S. ChavesII; Yanna C. F. TelesIII; Diégina A. FernandesIV; Camila Macaúbas-SilvaI;
Wallace A. M. QueirozII; Jéssica B. LimaV; Maristela R. R. M. MazzottiV; Edeltrudes O. LimaI,II; Givanildo L. FernandesVI;
Adilva S. ConceiçãoV; Maria de Fátima Vanderlei de SouzaI,II,*
A phytochemical study from aerial parts of Pavonia glazioviana Gurke led to identify fifteen compounds, with emphasis on the polymethoxylated flavonoids that showed antimicrobial activity.
Adrianne B. FerreiraI,* Rosane M. AguiarII; Hugo N. BrandãoIII; Rauldenis A. F. SantosIV; Humberto F. de FreitasIII,V; Catharine TelesV; Joice N. ReisV; Jessica L. de SouzaIII; Clayton Q. AlvesI
Amburana acreana Ducke leaves afforded coumarin, p-hydroxybenzoic, vanillic acids, campesterol 3-β-D-glucoside and amburoside B.
Jhessica Cavalcante de Souza GolveiaI; Elaine Sousa NunesI; Thiago Souza BulhõesI; Jerônimo Raimundo de Oliveira NetoII; Luiz Carlos da CunhaII; Luiza Cintra CamposIII; Mariângela Fontes SantiagoI; Fernando SchimidtIV,*
Bisphenol A (BPA) is challenging to remove in conventional wastewater treatment. In this study, with the laccase enzyme from Pleurotus ostreatus induced by acai berry and pineapple residues, BPA was effectively degraded within 4 hours.
Caio V. L. V. do Nascimento; Arthur L. S. de Araújo; Lidiane M. A. de Lima; Filipe C. P. de Sousa; Wagner E. Silva; André F. Lavorante; Mônica F. Belian*
This paper describes a synthesis, and characterization of an organofunctionalized silica (Sil-TMSDT) and its application as a solid phase in the preconcentration (SPE) of Pt4+ ions in aqueous media, using detection by flame atomic absorption spectrometry (FAAS).
Ana J. CecattoI; Anelise S. N. FormagioII; Cleide V. Buzanello-MartinsIII; Caroline FortunaI; Márcia R. P. CabralI; Willian F. da CostaI; Débora C. BaldoquiI; Maria H. SarragiottoI,*
This work deal with the phytochemical and dereplication studies, as well as antimicrobial and anticholinesterase evaluation of Palicourea tomentosa.
Rosaly Morales-GuevaraI,II; Dayán Páez-HernándezI; Manuel GacitúaIII,IV,V,*; Juan A. FuentesVI; Alexander CarreñoI,VII,*
Schiff bases (SB) are diverse organic compounds, holding potential in both chemistry and biology. We explored an amino benzoic acid SB that presents a stable intramolecular hydrogen bond by cyclic voltammetric profiles supported by computational protocol to estimate redox potentials.
Raysa Trindade da SilvaI; Wagner Arruda de JesusI; Mário Rodrigo dos Santos SoaresII; Ariane Isis BarrosI,*; Oscarlina Lúcia dos Santos WeberI
The application of liquid swine waste doses to a clayey Cerrado Oxisol improved its physical, chemical, and electrochemical attributes, leading to an increase in nutrient availability for plants and clay aggregation.
Jinlong GeI,II,*; Xiaoqi JinI,II; Liyuan ZhangI,II; Yuhong JiaoI,II; Qiuqin WangI,II; Yongkui WangI,II; Yan GaoI,II;
Jiaojiao GengI,II; Tianqi WangI,II
UiO-66-type Metal-Organic Frameworks (MOFs) were synthesized with functionalized organic linker. UiO-66-NH2 has the highest CO2 adsorption capacity.
Andrew M. TeixeiraI; Julia Maia Galvão de QueirozI; Bruno C. GarridoII; Antônio Jorge R. SilvaI,*; Anelize BauermeisterIII;
Ricardo M. BorgesI
A workflow for analytical procedures promoting quality control and quality assurance in untargeted metabolomics.
Paula Homem-de-MelloI,*; Ana Clara Gonzalez de SouzaI; Diêgo U. MeloI; Gabriel S. MolI; Jhonathan R. De SouzaI; Leonardo M. CarneiroI; Maíra G. NobregaI; Mateus ZanottoI; Raissa Lohanna G. Q. CorrêaI; Hueder P. M. de OliveiraI; Fernando H. BartoloniI; Yuri A. AotoII; Mauricio D. Coutinho-NetoI; Ednilsom OrestesI,III
Dyes of natural origin are an inspiration for the development of new molecules. Several computational methods can be used to deepen knowledge of these compounds' photophysical properties, from methods based on quantum mechanics to machine learning strategies.
Luiz Phelipe de Souza TomasoI; Joice Florenço BomfimII; Nakédia M. F. CarvalhoII; Jaqueline Dias SenraII;
Luiz Fernando Brum MaltaI,*
Layered double hydroxides are multifunctional agents as catalytic mediators in reaction processes of paramount importance.
Alana Deduck CicilinskiI,*; Vander de Freitas MeloII; Patricio Peralta-ZamoraI
The existence of mobile colloidal fractions favors the transport of pollutants through the soil, even when strongly sorbed.
Guilherme M. Martins*; Kleber T. de Oliveira*
This review provides an overview of recent advancements in organic electrosynthesis in Brazil. It highlights the principles, applications, and limitations of various electrosynthetic methodologies, aiming primarily to enhance the understanding of fundamental principles and stimulate research in this field.
Lucas Paradizo Roma*; Déborah Yara A. C. Santos
Wax lipids primarily consist of aliphatic acyclic compounds, which are often misidentified by Standard Digital Libraries. WaxAlly is a new software developed to assist in identifying the mass spectra of the main classes of wax lipids.
Karinna Gomes Oliveira RodriguesI; Patrícia X. BalizaII; Douglas A. CastroI; Paulo Vitor Brandão LealII; Douglas Henrique PereiraI,III,*
Adsorption Kinetics Calculation (AKC) is a new free, easy-to-use software that uses non-linear equations to calculate adsorption kinetics parameters with precision, fast performance and a user-friendly interface.
Marcus L. Sousa; Isabela A. Duran; Giovana V. Teixeira; André L. B. Formiga*
The invention aims to improve the calibration of gas sensors not covered by a membrane using a system for mixing solutions with different gas concentrations.
Rafael P. Machado; Antônio C. Doriguetto*
Integrating the chemical, historical, physical, and mathematical concepts encompassed by crystallography in the determination of crystal structure through X-ray diffraction fosters a more comprehensive and effective grasp of this powerful interdisciplinary tool.
Caroline I. SilveiraI,II; Samuel A. PereiraI,II; Victoria B. V. de LeonI; Jeanifer T. CamachoI; Amanda F. LeitzkeI; Rogério A. FreitagI; Claudio M. P. de PereiraI; Bruno N. da RosaI,II,*
The acetylsalicylic acid produced in the experimental classes, which would typically be discarded, is recycled through purification and characterization for later use as a fingerprint developer.
Arlan de Assis GonsalvesI,II; Victória Laysna dos Anjos SantosIII; Sidney Silva SimplicioII; Délis Galvão GuimarãesIII; Cleônia Roberta Melo AraújoI,IV,*
Graphical summary of the theoretical aspects (one-pot synthesis) that will be explored in this work, which aims to contribute to the chemistry teaching in Brazilian higher education.
Mariana S. M. dos Santos; Tania D. M. Salgado*
Chemistry education focused on citizenship education, ethics in interpersonal relationships and mainly criticism of social and cultural inequalities.
Cleane C. Paz*; Luciana N. A. Ferreira
The construction of arguments by solving experimental problems with the help of the heuristic diagram.
Rebeca Fernanda de Souza e Silva; Natália Neves Macedo Deimling; Patrícia Valderrama*
How to interpret it? Perform a PCA (principal component analysis). And, how to interpret the PCA results?
Luclécia D. NunesI; Nyuara A. S. MesquitaII,*
The training of Chemistry teachers by higher education institution in the state of Goiás in relation to radioactivity presents gaps that reverberate in the teacher's performance in basic education.
Lucas A. L. Dias; Thiago M. Cardozo; Roberto B. Faria*
Comparative splitting of spectroscopic terms for a p2 electronic configuration following LS and jj spin-orbit coupling schemes.
Yasmim Rodrigues dos Santos; Rafaela Leal Pereira; Eduarda Rezende Barbosa; Ana Paula de Carvalho Teixeira;
Rochel Montero Lago*; Fabiano Gomes Ferreira de Paula*
In this article, we present a ChemTech acceleration program where the academic participants (researchers and students) develop entrepreneurial skills while taking their chemical technologies from universities to the market/industry.
Ana Rosa Kucinski Silva, lecturer in the Department of Chemistry at the University of São Paulo, was kidnapped and murdered in 1974 by the Brazilian military dictatorship (1964-1985). Very little is known about her academic activities. This work aims to contribute to fill this gap.
Thamires Luciana Braz Alves*; Ana Paula de Carvalho Teixeira; Breno Germano de Freitas Oliveira; Luísa Carolina Andrade Barbosa; Maria Paula Duarte de Oliveira; Rochel Montero Lago*
Escalab is a chemical technology and innovation lab at Universidade Federal de Minas Gerais (UFMG) structured to take technologies to the market and connect academy-industry focused on scale up, business modeling and startup creation.
Douglas C. Silva; Emilio Borges*
One of the most important equations in the history of chemistry. It represents the culmination of decades of conceptual and experimental evolution in the field of electrochemical systems and still today stands as one of the pillars of modern electrochemistry.
Rodrigo Régis C. SilvaI,II; Rita de Cássia MarquesIII; Carlos A. L. FilgueirasI,*
Alfred Schaeffer (center) in one of his classes for medical and pharmaceutical courses at the Faculty of Medicine of Belo Horizonte in the 1910s.
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