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ARTIGOS RECENTES


Artigo

REMEDIATION OF TANNERY AND ELECTROPLATING WASTEWATERS: ADSORPTION OF HEAVY METALS BY Chlorella sorokiniana AND Heterochlorella luteoviridis

Allan Morcelli; Gabriel Luiz Vencato; Rosane Rech; Nilson Romeu Marcílio

The figure depicts a factory with the words “tannery/electroplating industry” above it is shown with an arrow coming out of it, representing copper, chromium, iron and zinc ions going into a shake flask with green liquid where microalgae are illustrated being cultivated.

http://dx.doi.org/10.21577/0100-4042.20250189

Publicado online: agosto 1, 2025
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Total access: 33

Comparative study of the chemical composition of amapa latex from Parahancornia Amapa and Brosimum parinarioides BY HPLC-UV-DAD

Rita Cynara de Oliveira SallesI,II,*; Sergio Massayoshi NunomuraII; Norberto Peporine LopesIII;
Rita de Cássia Saraiva NunomuraI,*

Amapa latex is a traditional medicine in the Amazon and is commercialized from two plant species Parahancornia amapa and Brosimum parinarioides. We report the isolation of the main compounds from both species and compared the chromatographic profiles by high-performance liquid chromatography (HPLC).

http://dx.doi.org/10.21577/0100-4042.20250187

Publicado online: julho 29, 2025
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Total access: 59

Detecção de flavonoides com propriedades tripanocida e antioxidante nas folhas de Senna multijuga (Fabaceae)

Cássia G. MagalhãesI,II,*; Ana Letícia P. dos SantosII; Marcelino S. do RosárioII; Elton KazmierczakI; André V. BassaniI;
Christiana A. PessoaI; Jorge IarmulIII; Iriane EgerIII; Vanderlan S. BolzaniII

A diagram linking the molecular networking of extracts from Senna multijuga obtained from Global Natural Product Social Molecular Networking (GNPS) platform and the antioxidant and tripanocidal potential of this species is presented in this Graphical Abstract.

http://dx.doi.org/10.21577/0100-4042.20250186

Publicado online: julho 29, 2025
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Total access: 63

Chemical and biological investigation of Cattleya nobilior Rchb. F. (Orchidaceae): targeting on phenanthrene and stilbenoid derivatives

Caroline de Moura CostaI,#; Katyuce Souza FariasI,#; Izadora BonfimI,#; Heron F. V. TorquatoII; Samara Requena NocchiI;
Laís Azevedo RodriguesI; Júlio Mentha AlmeidaIII; Flávio Macedo AlvesIV; Alda Maria Teixeira FerreiraIII; Helori Vanni DomingosV;
Edgar J. Paredes-GameroII; Leticia V. Costa-LotufoV; Carlos Alexandre CarolloI; Denise Brentan SilvaI,*

The graphical abstract depicts the solvent extraction of Cattleya nobilior to evaluate cytotoxic and anti-Trypanosoma cruzi activities. Metabolomics analysis linked chemical composition to bioactivity, revealing promising pharmacological potential.

http://dx.doi.org/10.21577/0100-4042.20250185

Publicado online: julho 29, 2025
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Total access: 67

In silico and in vitro activity of friedelin N-derivatives against promastigote forms of Leishmania amazonensis

Mauro Lúcio Gonçalves de OliveiraI; Lucienir Pains DuarteI; Grácia Divina de FátimaI; Silvia Ribeiro de SouzaII;
Misléia Rodrigues de Aguiar GomesII; Sidney Augusto Vieira-FilhoI,III; Vera Lucia de AlmeidaI,IV; Júlio César Dias LopesI,*

This study investigates N-derivatives of friedelan-3-one from Maytenus gonoclada, employing the NEQUIM Active-IT bioactivity prediction tool and experimentally validating their in vitro activity against Leishmania amazonensis, thereby revealing potential therapeutic applications.

http://dx.doi.org/10.21577/0100-4042.20250184

Publicado online: julho 22, 2025
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Total access: 121

Metabolic diversity of zoantharians collected at brazilian oceanic islands

Bianca Del B. SahmI,II,#; Ana C. ZanattaII,#; Francisco da Chagas L. PintoIII; Otília D. L. PessoaIII; Diego V. WilkeIV; Paula C. JimenezV; Norberto P. LopesII; Tito M. C. LotufoVI; Letícia V. Costa-LotufoI,*

The metabolic fingerprinting of Palythoa caribaeorum, Palythoa variabilis and Zoanthus spp. collected at different Brazilian oceanic islands showed core species-specific metabolites similar to those of continental zoantharians, and a dynamic fraction of an environment-driven chemodiversity.

http://dx.doi.org/10.21577/0100-4042.20250178

Publicado online: julho 22, 2025
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Total access: 199

Chemical composition and measuring the distribution of haemanthidine by MALDI-TOF MS imaging from Crinum scabrum leaves

Jennifer B. PardoI; Amanda E. FeuI; Faviola A. VigamonteII; Warley de S. BorgesI,*

Extraction, isolation and detection of haemanthidine in the Crinum scabrum leaves.

http://dx.doi.org/10.21577/0100-4042.20250183

Publicado online: julho 21, 2025
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Total access: 113

Diterpenoids from the roots of Annona vepretorum Mart. (Annonaceae)

Ana L. M. SouzaI; Jéssica F. AuzierII; Lívia M. DutraI; Victoria L. A. SantosIII; Emmanoel V. CostaII; Jackson R. G. S. AlmeidaI,*

Five substances belonging to the terpenoid class were isolated from the roots of Annona vepretorum Mart. The five substances are characterized by the presence of the kaurene and kaurane diterpenes skeleton. The compound 17-nor-kaur-16-one (2) is being reported for the first time in the Annonaceae family.

http://dx.doi.org/10.21577/0100-4042.20250182

Publicado online: julho 21, 2025
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Total access: 116

Análise quimiossistemática da família myristicaceae: a via mista (acetato/chiquimato)

Raquel M. de S. N. SampaioI,*; Adriana L. de SousaII; Rodrigo B. B. FeitozaI; Rodrigo R. de OliveiraI; Maria Raquel G. VegaI

The genera of the Myristicaceae family that have special mixed pathway metabolites are Horsfieldia, Iryanthera, Knema, Myristica, Pycnanthus and Virola.

http://dx.doi.org/10.21577/0100-4042.20250181

Publicado online: julho 21, 2025
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Total access: 125

Bolhômetro digital: construção de instrumento de medida de vazão gasosa baseado em transmitância de luz em faixas de 15-150 mL min-1

Igor R. NevesI,*; André J. R. SimõesII; Leandro R. TeixeiraII; Juliane G. C. GomesII; Soraia T. BrandãoI; Iuri M. PepeII

The image shows schemes of an analog bubble-flowmeter and present warnings about its challenges (long analysis time, ergonomic risk) and shows its replacement with a digital bubble-flowmeter thereby eliminating the challenges.

http://dx.doi.org/10.21577/0100-4042.20250180

Publicado online: julho 18, 2025
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Total access: 83

Abordagens DFT para espectros de absorção UV-VIS: explorando semelhanças e diferenças em compostos orgânico e de coordenação

Vania Martins Ramos; Bruno Campana Severino; Ana Paula de Lima Batista*

Different density functional theory (DFT) / time-dependent DFT (TD-DFT) protocols for ultraviolet-visible (UV-Vis) spectra were assessed, optimizing functionals, basis sets, and solvation models for reliable geometric and spectral analysis of organic and inorganic compounds.

http://dx.doi.org/10.21577/0100-4042.20250179

Publicado online: julho 18, 2025
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Total access: 121

Kinetic study of 1020 carbon steel corrosion in hydrochloric and nitric acid media

Fernando C. OliveiraI; Almir Silva NetoI; Lucas Brites FaresII; Tiago Almeida SilvaII; Renata Maria Seara MartinsI,*

The kinetic study of 1020 carbon steel corrosion revealed zero-order kinetics for the HCl system and first-order kinetics for the HNO3 system.

http://dx.doi.org/10.21577/0100-4042.20250177

Publicado online: julho 17, 2025
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Total access: 152

Microencapsulated powders of agraz (Vaccinium meridionale Swartz) fruit as a carrier for metabolites with in vitro antihypertensive activity

Andrés Mauricio AmayaI; María Carolina OtáloraII; Coralia OsorioI,*

The angiotensin converting enzyme-I (ACE-I) inhibition of Vaccinium meridionale Swartz fractions and microencapsulates was evaluated, finding that anthocyanins are responsible for this activity.

http://dx.doi.org/10.21577/0100-4042.20250175

Publicado online: julho 14, 2025
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Total access: 99

Otimização de extração de compostos fenólicos das folhas de Lippia alba (Mill.) N. E. Brown por ultrassom e comparação com técnicas convencionais

Raphael A. de JesusI; Julio M. A. OliveiraI; José M. da SilvaI; Wenes R. da SilvaI; Alberto Wisniewski JrI; José C. F. S. FilhoII; Arie F. BlankII; Daniel A. de SouzaIII; Elma R. S. A. WarthaIII; Paulo C. L. NogueiraI; Valéria R. S. MoraesI,*

Optimization of extraction of phenolic compounds from Lippia alba (Mill.) N. E. Brown leaves by ultrasound and comparison with conventional techniques.

http://dx.doi.org/10.21577/0100-4042.20250173

Publicado online: julho 7, 2025
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Total access: 218

Solvente eutético profundo para extração de cobre em amostras de chás e determinação por GF AAS

Eduardo da Silva Macedo; Caroline Gonçalves; Fabiana Luvizon Germer; Eduardo Sidinei Chaves*

Deep eutectic solvent for extraction of copper from tea samples.

http://dx.doi.org/10.21577/0100-4042.20250172

Publicado online: julho 7, 2025
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Total access: 153

Tannic acid supported by magnetite nanoparticles for the removal of CdII and PbII from water

Camilo Eduardo García Henao; Guillermo Salamanca Grosso; Anderson Guarnizo Franco*

Magnetite nanoparticles-supported tannic acid capturing CdII and PbII from water.

http://dx.doi.org/10.21577/0100-4042.20250171

Publicado online: julho 7, 2025
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Total access: 142

Comparison between methodologies for the calculation of kinetic triplet for the pyrolysis of heterogeneous biomass (sunflower seed husks)

Arthur T. F. A. AraújoI; Nádia G. SousaII; Cássia R. CardosoIII; Daniel A. CerqueiraIV,*

The work presents a comparison of methodologies for the kinetic modelling of heterogeneous biomass pyrolysis, and shows a precise representation, with low deviations between theoretical and experimental curves.

http://dx.doi.org/10.21577/0100-4042.20250170

Publicado online: julho 4, 2025
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Total access: 130

Raman spectroscopy: a study of the vibrational spectra of hydroxybenzoic acid isomers

Shaoliang ShiI,#; Shan TuII,III,#,*; Wentao ZhangII,*; Song YangII; Hao DuII; Yuanpeng LiIII; Junhui HuIII; Huapeng XiaoIII

This graphical summary illustrates the molecular structures of the three chiral molecules: ortho-hydroxybenzoic acid (O-HA), meta-hydroxybenzoic acid (M-HA), and para-hydroxybenzoic acid (P-HA). The left side shows the Raman spectral signals, while the middle compares experimental and theoretical Raman spectra, highlighting the recognition process. Finally, the right side presents their vibrational modes.

http://dx.doi.org/10.21577/0100-4042.20250169

Publicado online: julho 3, 2025
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Total access: 117

Exploring the antioxidant activity of Eugenia uniflora L. extracts: a comparative approach by different techniques

Vinicius Monteiro Schaffka; Cássia Gonçalves Magalhães*; Romaiana Picada Pereira

The graphical abstract shows a diagram linking Eugenia uniflora L. leaf extracts, antioxidant activity, and analytical techniques (total phenolic content (TPC), total flavonoid content (TFC), gas chromatography-mass spectrometry (GC-MS), and ultra-performance liquid chromatography-mass spectrometry (UPLC-MS)) used in this study as well as the molecular structures of the compounds found in this species.

http://dx.doi.org/10.21577/0100-4042.20250168

Publicado online: julho 1, 2025
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Total access: 204

Obtenção de um plástico biodegradável à base de fécula de araruta (Maranta arundinacea) e casca de ovo

Rosanny C. da SilvaI,*; Cleylton B. LopesII; Fred A. R. NogueiraI; Leonardo V. da SilvaI; Alessandra F. da SilvaI; Amanda V. S. OliveiraI; Elisangela O. da SilvaI; Italo G. dos S. SilvaI; Jose C. dos S. SilvaI; Julia E. de C. SilvaI; Julie A. dos S. QuintelaI; Larissy A. da S. RibeiroII; Maria C. P. D da C. GomesII; Marilian G. dos S. BernardoI; Walleska J. de A. MarquesI

Calcium carbonate derived from eggshells was added to arrowroot film, resulting in a polymer composite capable of preserving food.

http://dx.doi.org/10.21577/0100-4042.20250166

Publicado online: junho 26, 2025
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Total access: 200

Bixa orellana lipids as a source of geranylgeraniol: extraction techniques and characterization

Miguel A. Martinez Gutierrez; Igor F. P. da Silva; Henrique F. Goulart; Antônio E. G. Santana*

Obtaining oil from urucum seeds by ultrasound-assisted extraction, Soxhlet, and steam distillation methods, characterization, and quantification.

http://dx.doi.org/10.21577/0100-4042.20250165

Publicado online: junho 25, 2025
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Total access: 222

A new prenylated guaiane from the brown seaweed Dictyota mertensii

Neilyane de Paula FernandesI; Fábio do Nascimento ÁvilaI; Késya Amanda D. RochaI; Pedro B. de Mâcedo CarneiroII; Greyce L. SasaharaIII; Flavia A. SantosIV; Edilberto R. SilveiraI; Otília Deusdenia L. PessoaI,*

The chemical investigation of the ethyl acetate extract from the brown seaweed Dictyota mertensii led to the isolation of prenylated guaiane and dolabellane diterpenes.

http://dx.doi.org/10.21577/0100-4042.20250164

Publicado online: junho 25, 2025
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Total access: 201

Amides isolated from the leaves of Piper tuberculatum Jacq. (Piperaceae) with acetylcholinesterase inhibition and larvicidal activity against Aedes aegypti

Brenda R. C. LeocadioI,II,*; Taynara S. ValeIII; Felipe M. A. da SilvaI,II; João V. C. O. SantosII; Sergio M. NunomuraIV; André C. de OliveiraV; Ingrity S. C. SáVI; Rosemary A. RoqueV; Ana Paula A. CastroI,II; Magno P. MunizIV; Rita C. S. NunomuraI,II,III*

cis-Piplartine, piplartine and 4,5-dihydropiperlongumine isolated from leaves of Piper tuberculatum were active against Aedes aegypti larvae and have acetylcholinesterase (AChE) inhibitory activity.

http://dx.doi.org/10.21577/0100-4042.20250162

Publicado online: junho 17, 2025
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Total access: 228

LC-MS/MS based dereplication of isoquinoline-derived alkaloids from the trunk bark of Unonopsis rufescens (Baill.) R.E.Fr. (Annonaceae)

Lucas Antônio F. de AlmeidaI,II; Felipe Moura A. da SilvaI,II,*; Bruna Ribeiro de LimaII,III; Aline Bastos B. de SousaII; Francinaldo A. da Silva FilhoII; Brenda R. C. LeocadioI,II; Ana Paula A. CastroI,II; Rebeca dos S. FrançaI,II; Hector H. F. KoolenIV; Afonso D. L. de SouzaI,II,III; Maria Lúcia B. PinheiroII,III,*

Pallidine and other isoquinoline-derived alkaloids were tentatively identified in the trunk bark of U. rufescens through liquid chromatography coupled to tandem mass spectrometry analysis (LC-MS/MS) and fragmentation pattern analysis.

http://dx.doi.org/10.21577/0100-4042.20250159

Publicado online: junho 17, 2025
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Total access: 208

Peltogynoids from Peltogyne catingae ducke and their antifungal potential against Sporothrix spp.

Davi S. OliveiraI; Priscila B. A. de SouzaI; Luiz Henrique K. Queiroz-JuniorII; Denise O. ScoarisIII; Luana P. da SilvaIII; Claudete C. do NascimentoIV; Maria da Paz LimaIV,*

The modified flavonoids known as peltogynoids extracted from the wood residues of Peltogyne catingae Ducke ("roxinho") presented antifungal properties against Sporothrix schenckii and S. brasiliensis that cause feline sporotrichosis.

http://dx.doi.org/10.21577/0100-4042.20250158

Publicado online: junho 16, 2025
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Total access: 263

Efficient extraction of 2'-Fucosyllactose from human milk: parameter optimization with surface response

Elienae da Silva Gomes; Eloize Silva Alves; Patricia Daniele Silva Santos; Marcela de Souza Zangirolami; Oscar Oliveira Santos

Optimization of the extraction of the 2'-fucosyllactose from human milk, finding experimental conditions including optimizing solvent (water) and centrifugation time for safe and rapid extraction.

http://dx.doi.org/10.21577/0100-4042.20250157

Publicado online: junho 16, 2025
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Total access: 165

Clarificación de vinazas provenientes de la industria de la "raicilla", mediante el uso de hidrogeles

Maribel Arrizón FregozoI; Nestor García RamírezI; Jorge Alberto Cortes OrtegaII; Juan Carlos Sánchez DíazI,*

Scheme of the process of copper ion absorption, transformation into copper hydroxide entrapped in the hydrogel and the absorption of furfural, one of the organic compounds present in vinasse.

http://dx.doi.org/10.21577/0100-4042.20250156

Publicado online: junho 13, 2025
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Total access: 211

Synthesis of the TiO2/g-C3N4 photocatalyst and its photocatalytic performance for selective oxidation of alcohols

Shuangyan MengI; Bin LiuI; Minglin XieI; Chaoxin YunI; Jin QiangI; Kaizhou HeI; Zhiwang YangII; Xiangqian WangI,*

A composite photocatalyst, xTCN, was synthesized using a simple one-step hydrothermal method, with H2O2 as the oxidant. This approach effectively reduced the bandgap energy and minimized the recombination of photogenerated carriers. The bandgap structure of g-C3N4 was modified by the incorporation of an O atom, improving the separation efficiency of the photogenerated electrons and holes.

http://dx.doi.org/10.21577/0100-4042.20250155

Publicado online: junho 13, 2025
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Total access: 148

1-Indanone derivatives: a novel one-pot approach to imides via beckmann-like rearrangement and theoretical insights into their interactions with ache enzyme

Thiago R. F. BastosI; Telma Leda G. de LemosI; Raimundo Braz FilhoII,III; Aluísio Marques da FonsecaIV;
Francisco J. Queiroz MonteI,*

Novel imides were synthesized from (E)-2,3-dihydro-1H-inden-1-one oxime via Beckmann-like rearrangement with nucleophilic catalysts. Molecular docking indicated that derivatives 5i, 5g, and 5h showed promising acetylcholinesterase inhibition compared to galantamine.

http://dx.doi.org/10.21577/0100-4042.20250154

Publicado online: junho 11, 2025
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Total access: 220

Antimicrobial activity of compounds isolated from mangrove-derived endophytic fungus Actinomucor elegan against Xanthomonas axonopodis pv. passiflorae

Kathia Raquel Murillo PadillaI; Rayanne Priscila Vieira da ConceiçãoI; Gisele da Costa RamosI; Luana Cardoso de OliveiraII,
José Edson de Sousa SiqueiraI; Mayra Suelen da Silva PinheiroIII; Patrícia Santana Barbosa MarinhoI,;
Andrey Moacir do Rosario MarinhoI,II,*

Tyrosol derivative compounds isolated from Actinomucor elegan fungus show good antimicrobial activity against  Xanthomonas bacteria which causes bacterial spots in passion fruit.

http://dx.doi.org/10.21577/0100-4042.20250153

Publicado online: junho 10, 2025
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Total access: 257

Glicosídeos esteroidais de Solanum jabrense Agra & M.Nee

Anauara Lima e SilvaI; Thiago A. M. BritoI; Maria de Fátima AgraII; Marcelo S. da SilvaI; Josean F. TavaresI,*

Saponins and glycosylated steroidal alkaloids were isolated from the hydroalcoholic extract of aerial parts of Solanum jabrense Agra & M.Nee, identified and characterized by nuclear magnetic resonance (NMR), infrared spectroscopy (IR), mass spectrometry (MS) and optical rotation.

http://dx.doi.org/10.21577/0100-4042.20250151

Publicado online: junho 10, 2025
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Total access: 224

Regioselective and chemoselective biocatalytic reduction of α,β,γ,δ-unsaturated ketones by marine-derived fungus Penicillium citrinum CBMAI 1186

Pedro H. DamadaI,*; Pedro H. O. SantiagoII; Javier EllenaII; André L. M. PortoI

The graphic shows Penicillium citrinum CBMAI 1186 reducing α,β-unsaturated ketones to γ,δ-unsaturated ketones at 32 ºC and 135 rpm. This demonstrates the regioselective and chemoselective efficiency of the strain, highlighting its potential as a biocatalyst.

http://dx.doi.org/10.21577/0100-4042.20250149

Publicado online: junho 3, 2025
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Total access: 258

Stereoselective oxidative coupling of methyl trans-ferulate to (±)-trans-dehydrodiferulate dimethyl ester by Trametes versicolor FC: an enantioselective green approach

Eliane O. SilvaI,*; Herbert J. DiasII,III; Anderson R. M. OliveiraIII; Antônio E. M. CrottiIII

Methyl trans-ferulate was converted into the dihydrobenzofuran neolignan trans-dehydroferulate dimethyl ester with good enantioselectivity using an advantageous approach based on Trametes versicolor FC.

http://dx.doi.org/10.21577/0100-4042.20250147

Publicado online: maio 30, 2025
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Total access: 280

Hirtinol A: a new limonoid from the seeds of Trichilia hirta Linneaus (Meliaceae)

Renata Rodrigues da Silva RobainaI,*; Gabriela DinisII; Lucas Silva AbreuII; Raimundo Braz-FilhoI,III; Ivo José Curcino VieiraI

The phytochemical study of Trichilia hirta Linneaus (Meliaceae) seeds resulted in the isolation and identification of a new limonoid named Hirtinol A, in addition to a mixture of 21α-melianone and 21β-melianone, and the glycoside schumaniofioside A.

http://dx.doi.org/10.21577/0100-4042.20250146

Publicado online: maio 21, 2025
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Total access: 291

Fenilpropanoides com ação anti-Trypanosoma cruzi isolados das folhas de Piper crassinervium (Piperaceae)

Nathalia F. QuintilianoI,II; Sávio R. SoaresII; Miriam UemiI; Guilherme M. AntarIII; Patricia SartorelliII; Andre G. TemponeIV;
João Henrique G. LagoI,*

Bioactive hexane extract from leaves of Piper crassinervium was subjected to a bioactivity-guided fractionation to afford five metabolites (1-5). Compound 5 is previously undescribed while compounds 1, 2 and 4 are being described for the first time in P. crassinervium. Compounds 1-5 were evaluated against trypomastigote forms of parasite Trypanosoma cruzi whereas their toxicity was evaluated against NCTC cells.

http://dx.doi.org/10.21577/0100-4042.20250145

Publicado online: maio 21, 2025
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Total access: 304

Sensor eletroquímico baseado em óxido de grafeno reduzido e estanato de zinco para determinação de prometazina

Andreza L. MoreiraI; Janevane S. de CastroI,II; Anderson V. ChavesI; Pierre B. A. FechineI; Pedro de Lima-NetoI,;
Francisco W. P. RibeiroIII; Paulo N. S. CascianoI; Adriana N. CorreiaI,*

Schematic diagram of the procedure used. It consists of a glassy carbon electrode modified with graphene oxide and zinc stannate and a potentiostat/galvanostat coupled to a computer and can be used for the analysis of promethazine hydrochloride.

http://dx.doi.org/10.21577/0100-4042.20250144

Publicado online: maio 20, 2025
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Total access: 264

Thermoplastic starch-ucuuba biocomposites: effect of buriti pulp oil on lignocellulosic fiber dispersion

Marcelo F. L. OliveiraI; Valdir F. Veiga-JuniorII; Marcia G. OliveiraI,; Fernanda Cristina F. BragaI,*

The study investigates thermoplastic starch (TPS) biocomposites with ucuuba fibers, focusing on the effect of buriti pulp oil. This oil improved the matrix, decreasing hydrophilicity and slightly increasing strength, while rheological and scanning electron microscopy (SEM) analyses confirmed better plasticization and enhanced thermal stability.

http://dx.doi.org/10.21577/0100-4042.20250142

Publicado online: maio 15, 2025
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Total access: 200

Chemical constituents from the leaves of Eriodictyon californicum (Hook. & Arn.) Torr. (Boraginaceae)

Brenda K. M. SousaI; Talita L. N. GonçalvesI; Lívia M. DutraI; Victória L. A. SantosII; Emmanoel Vilaça CostaIII;
Agnaldo R. M. ChavesIV, José M. PintoIV, Marcelo F. R. SilvaV; Yuri M. NascimentoV; Josean F. TavaresV; Marcelo S. SilvaV;
Jackson R. G. S. AlmeidaI,*

Seven compounds, belonging to the flavonoid, phenylpropanoid and chromone classes, were isolated from the leaves of Eriodictyon californicum. Among the isolated compounds, ethyl cinnamate (6) and 5-hydroxy-7-methoxychromone (7) are being reported for the first time in E. californicum and in the Boraginaceae family.

http://dx.doi.org/10.21577/0100-4042.20250140

Publicado online: maio 12, 2025
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Total access: 329

Chemical composition, antioxidant potential, and cholinesterase inhibitory activity of essential oils from three Thunbergia species growing wild in northeast Brazil

Alice M. S. de Almeida; Tchiara M. A. Tenório; Lucas V. B. Rodrigues; Carolina A. de Araujo; Claudio A. G. da Camara*;
Marcilio M. de Moraes

The analysis of essential oils from three Thunbergia species revealed differences in their chemical profiles, but all contained sesquiterpenes as the predominant compounds. The oil from T. erecta demonstrated the highest efficacy in the DPPH (2,2-diphenyl-1-picrylhydrazyl), ABTS (2,2-azino-bis-3-ethylbenzothiazoline-6-sulphonic acid), AChE (acetylcholinesterase), and BuChE (butyrylcholinesterase) assays.

http://dx.doi.org/10.21577/0100-4042.20250139

Publicado online: maio 9, 2025
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Total access: 333

Fragmentation of deprotonated plumeran indole alkaloids by electrospray ionization tandem mass spectrometry

Yan R. RoblesI; Ricardo VessecchiI; Ivo J. C. VieiraII; Raimundo Braz-FilhoII,III,#; Antonio E. M. CrottiI,*

The fragmentation of deprotonated aspidospermine, aspidocarpine, demethoxypalosine, and aspidolimine was investigated in this work using negative electrospray ionization tandem mass spectrometry.

http://dx.doi.org/10.21577/0100-4042.20250138

Publicado online: maio 9, 2025
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Total access: 258

A new alkaloid isolated from Tabernaemontana hystrix Steud. (Apocynaceae) and the antiproliferative potential of the root bark against human cervical cancer (HeLa)

Thalya S. R. NogueiraI,*; Thiago C. SardouII; Julio Cesar Thurler JúniorII; Gabriela DinisIII; Vinícius D'avila B. PascoalII;
Lucas S. AbreuIII; Raimundo Braz FilhoI,IV; Aislan C. R. F. PascoalII; Ivo José C. VieiraI

Tabernaemontana hystrix (Apocynaceae) root bark showed antiproliferative potential against the HeLa cell line. Six alkaloids were isolated from EtOAc or BuOH fractions. Compounds 3 and 4 are being reported for the first time in the species, and compound 6 is new in the literature.

http://dx.doi.org/10.21577/0100-4042.20250137

Publicado online: maio 6, 2025
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Total access: 355

Caracterização, análise quimiométrica e ensaios preliminares de adsorção de corantes têxteis em celulose bacteriana: uma tecnologia para tratamento de efluentes com proposta para desenvolvimento de economia sustentável

Rafaela J. L. Gouveia-RamosI,*; Alex S. MoraesII; Arthur L. Silva de AraújoII; Larissa M. S. GomesII; Thaís J. M. P. SoutoII; Beatriz S. SantosI; Otávio P. Santos JúniorIII; Romildo M. HolandaI; Gledson Luiz Pontes de AlmeidaI

In the research, a bio adsorbent was produced as an alternative to textile wastewater treatment and could act as a tool for recycling dyes and saving water. This process would reduce the costs of dyeing fabrics by obtaining a new "ecological dye" for subsequent tanning.

http://dx.doi.org/10.21577/0100-4042.20250136

Publicado online: maio 6, 2025
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Total access: 308

Phytochemical study from the aerial parts of Pavonia malacophylla (Malvaceae) and evaluation of its antimicrobial potential

Janderson Barbosa Leite de AlbuquerqueI; Otemberg Souza ChavesI; Wallace Amorim Machado de QueirozI;
Bárbara Fernandes Araújo RodriguesII; Diégina Araújo FernandesIII; Fábio Correia SampaioIV; Maria de Fátima AgraV; Maria de Fátima Vanderlei de SouzaI,II,*

A phytochemical investigation of the aerial parts of Pavonia malacophylla resulted in the isolation and identification of eighteen compounds, revealing antimicrobial potential in its extract, fractions and isolated compounds.

http://dx.doi.org/10.21577/0100-4042.20250134

Publicado online: maio 5, 2025
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Total access: 283


Revisão

Organismos marinhos como fonte de novos fármacos: 15 anos e uma pandemia depois

Mateus F. BritoI; Thayssa S. F. FagundesII,III; Paula C. JimenezIV; Alessandra L. ValverdeI,*

A scientist is confused by the number of articles about marine organisms used as medicine and how they change over time. Talking to another scientist, they decide to write a review article to compile the data into a single document.

http://dx.doi.org/10.21577/0100-4042.20250167

Publicado online: julho 1, 2025
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Total access: 184

Constituintes químicos e atividades biológicas de Remijia DC. (Rubiaceae): uma revisão

Fábio G. de Souza; Gabriel S. Crispim; Luana da C. Moreira; Cecilia V. Nunez*

Main databases used to search for articles about Remijia, and some of their biological activities and chemical substances.

http://dx.doi.org/10.21577/0100-4042.20250120

Publicado online: abril 3, 2025
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Total access: 395


Nota Técnica

Collision-induced dissociation in ESI-MS/MS of caramboxin isolated from Averrhoa carambola: computational and mass spectrometry studies

Ricardo VessecchiI; Pâmela R. R. PereiraII; Leonardo Gobbo-NetoII; Norberto Garcia-CairascoIII; Norberto Peporine LopesII,*

Fragmentation from electrospray ionization tandem mass spectrometry (ESI-MS/MS) analysis of caramboxin, a natural toxin, was explored using computational chemistry.

http://dx.doi.org/10.21577/0100-4042.20250160

Publicado online: junho 17, 2025
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Total access: 188


Educação

A reação de substituição eletrofílica aromática e os efeitos dos grupos nitroso e flúor: correção de imprecisões em livros texto

Igor SandeI; Leonardo AntonelliI; Matheus Almeida Ramos de JesusI; Silvio CunhaI,II,*

The effects of nitroso and fluorine groups in electrophilic aromatic substitution lack consensus across literature and textbooks. Beneath this apparent inconsistency lies a deeper layer of inherent details governing their effects on reactivity, which we unveil in this study.

http://dx.doi.org/10.21577/0100-4042.20250188

Publicado online: julho 30, 2025
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Total access: 82

Dicromatometria em microescala: motivação para diminuir os impactos ambientais no ensino da química analítica

Gabriel N. F. NettoI; Flávia F. de C. MarquesI; Rafaella R. A. PeixotoII; Christiane B. DuyckI,*

The microtitration of iron in dietary suplements by dichromate is presented as a sustainable alternative method to classical dichrometry, with less exposure and minimizing the generation of toxic residues.

http://dx.doi.org/10.21577/0100-4042.20250176

Publicado online: julho 15, 2025
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Total access: 93

Promoting undergraduate students' scientific literacy through a science communication project

Melina MurgelI,*; Diorleno SantosII; Liliana MarzoratiI

Science Communication pieces created by undergraduate students were analyzed for the presence of the Structural Axes of Scientific Literacy. Results showed prevalence of chemical concepts and Science, Technology, Society, and Environment (STSE) discussions but indicated a need for further attention to Nature of Science.

http://dx.doi.org/10.21577/0100-4042.20250174

Publicado online: julho 10, 2025
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Total access: 139

Uma simulação de caso para investigação de vestígios: análise de adulterantes de cocaína em impressões digitais utilizando a técnica do pó e espectrometria de massas

Paula F. FilodaI,*; Tais PolettiI,II; Bruno N. da RosaI,II; Caroline I. SilveiraI,II; Alexandre M. MachadoIII; Jeanifer T. CamachoI; Samuel A. PereiraI,II; Clarissa M. M. dos SantosIV; Claudio M. P. PereiraI,II

Chemical concepts behind fingerprints addressed through a forensic situation, in order to arouse students' interest and curiosity during teaching.

http://dx.doi.org/10.21577/0100-4042.20250161

Publicado online: junho 17, 2025
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Total access: 137

Integração entre ensino, pesquisa e extensão: impactos do programa 1000 futuros cientistas na educação básica

Janaína P. Silva; Juliana A. S. Oliveira; Wladmir T. Silva; Natália R. S. Araujo; Rita C. O. Sebastião*

Integration between teaching, research and extension, pillars of the 1000 Future Scientists program, highlighting the importance of university extension in the articulation between academic knowledge and teaching through social practices.

http://dx.doi.org/10.21577/0100-4042.20250143

Publicado online: maio 20, 2025
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Total access: 195


Assuntos Gerais

Furtos de fontes de radiação e seus impactos: aplicação de conceitos de radioquímica/química nuclear e seus desdobramentos para a sociedade

Hector H. S. MedradoI,II,*; Rodrigo G. de Souza GoisI,III; Gildo R. S. FerreiraIV; Carlos Alberto de Carvalho FilhoII

Radioactive sources are widely used in modern society but are not widely known by the lay public. Unfortunately, these materials can be stolen and can cause serious problems to society. Assessing this kind of event is only possible if nuclear chemistry and radiochemistry concepts are recognized.

http://dx.doi.org/10.21577/0100-4042.20250150

Publicado online: junho 4, 2025
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Total access: 161

Perfil dos jovens doutores em química no Brasil: desafios, disparidades e perspectivas

Helena Mannochio-RussoI,*; Fábio G. DeloloII; Rayane C. F. SilvaII; Francisco L. F. da SilvaIII; Eduarda A. MoreiraIV; Vanessa NascimentoV; Rodolfo G. FiorotV; Irlon M. FerreiraVI; Juliana C. ThomasVII; Wilhan D. G. NunesI; Alan C. PilonVIII; Romeu C. Rocha-FilhoIX

Mapping the landscape of early-career researchers in chemistry across Brazil, highlighting demographic trends, research productivity, and challenges.

http://dx.doi.org/10.21577/0100-4042.20250148

Publicado online: maio 30, 2025
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Total access: 398

30 Anos das tabelas periódicas da SBQ: cursos passados e estado atual

Ana Paula de Lima BatistaI,#,*; Antonio Gustavo Sampaio de Oliveira-FilhoII,#,*; Romeu C. Rocha-FilhoI,#,*;
Yuri Alexandre AotoIII,IV,#,*

Overlay of the different formats (2025 versions) of the periodic table of the elements of the Brazilian Chemical Society: in the background, the front of the A4 format, overlaid in sequence by the poster format and the digital format.

http://dx.doi.org/10.21577/0100-4042.20250115

Publicado online: maio 30, 2025
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Total access: 384

Oswaldo Sala: cientista, educador e exemplo

Dalva L. A. de FariaI,II,*; Joel C. RubimIII; Marcia L. A. TemperiniI; Mauro C. C. RibeiroI; Paola CorioI; Paulo S. SantosI;
Rômulo A. AndoI; Yoshio KawanoI

Oswaldo Sala played a pioneering role in the introduction and development of vibrational spectroscopy in Brazil and Latin America. His trajectory is here detailed, from his hiring by USP (IAG 1949) to the consolidation of his research group at IQUSP, from 1969 onwards.

http://dx.doi.org/10.21577/0100-4042.20250141

Publicado online: maio 13, 2025
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Total access: 242

On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
Química Nova
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