DEFAR - Artigos publicados em periódicos
URI permanente para esta coleçãohttp://www.hml.repositorio.ufop.br/handle/123456789/531
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Item Seasonality study of essential oil from leaves of Cymbopogon densiflorus and nanoemulsion development with antioxidant activity.(2019) Seibert, Janaína Brandão; Rodrigues, Ivanildes Vasconcelos; Carneiro, Simone Pinto; Amparo, Tatiane Roquete; Lanza, Juliane Sousa; Frezard, Frederic Jean Georges; Souza, Gustavo Henrique Bianco de; Santos, Orlando David Henrique dosThe development of formulations that maintain the biological and physical chemistry properties of essential oils is an important choice when they are used as an active ingredient. This study aimed to characterize the essential oil from leaves of Cymbopogon densiflorus and evaluate the antioxidant activity of the oil, and to produce a nanoemulsion formulation containing it. The essential oil was obtained by hydrodistillation, and seasonality was analysed every 2 months by gas chromatography–mass spectrometry, showing that more than 90% of the composition was maintained for the whole period and that the major compounds were trans‐p‐menta‐2,8‐dien‐1‐ol, cis‐p‐menta‐2,8‐dien‐1‐ol, trans‐p‐menta‐1(7),8‐dien‐2‐ol, cis‐piperitol, and cis‐p‐menta‐1(7),8‐dien‐2‐ol. Stable nanoemulsions were prepared by phase inversion method encapsulating the essential oil. The antioxidant activity was evaluated by 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) free radical scavenging and 2,2′‐azino‐bis(3‐ethylbenzothiazoline‐6‐sulphonic acid (ABTS) methods. In the first test, free and nanoemulsified essential oil showed half‐maximal inhibitory concentration (IC50) values equivalent to 14.689 and 3.692 mg mL−1, respectively. In the second test, these values were 0.567 and 0.43 mg mL−1. The development of nanoemulsion‐based essential oil from leaves of C. densiflorus was viable, and the formulated oil was able to reproduce the antioxidant activity at a concentration four times lower than that of the pure essential oil.Item Antibacterial activity of extract and fractions from branches of Protium spruceanum and cytotoxicity on fibroblasts.(2017) Amparo, Tatiane Roquete; Rodrigues, Ivanildes Vasconcelos; Seibert, Janaína Brandão; Souza, Rafaella Hilda Zaniti; Oliveira, Amanda Ribeiro de; Cabral, Vivette Appolinário Rodrigues; Vieira, Paula Melo de Abreu; Brandão, Geraldo Célio; Okuma, Adriana Akemi; Vieira Filho, Sidney Augusto; Teixeira, Luiz Fernando de Medeiros; Souza, Gustavo Henrique Bianco deThe crude ethanol extract (CEE) and fractions from branches of Protium spruceanum were subjected to antibacterial and cytotoxicity assays. Compounds of the most active fraction were identified by GC-MS and LC-MS. CEE was active against 19 bacteria and the ethyl acetate fraction (EAF) showed the lowest minimum bactericidal concentration (MBC 0.3–80.0 mg/mL). Through time-kill assay was observed that EAF induced rapid bactericidal effect against Staphylococcus saprophyticus. The cytotoxicity tests against L929 fibroblasts showed great potential of EAF on the treatment of infections caused by five bacteria (MBC < IC50). The results provide in vitro scientific support to the possible application of branches of P. spruceanum as antimicrobial agent that may contribute for treatment of infections.Item Antiedematogenic and antinociceptive effects of leaves extracts from Protium spruceanum Benth.(2013) Rodrigues, Ivanildes Vasconcelos; Souza, Juliana Neves de Paula; Silva, Ana Cláudia G.; Chibli, Lucas Apolinário; Cabral, Vivette Appolinário Rodrigues; Vieira Filho, Sidney Augusto; Perazzo, Fábio Ferreira; Guimarães, Andrea Grabe; Souza, Gustavo Henrique Bianco deEthnopharmacological relevance: In traditional medicine, gums and oil-resins from Protium species have been used for many diseases, however, there are no reports of studies of Protium spruceanum’ leaves. Materials and methods: The antiedematogenic and antinociceptive effects of crude ethanol extract (EEB) from leaves of P. spruceanum and its fractions were evaluated in biological models. The fractions were obtained with hexane (FHEX) and methanol (FMEOH). Rat paw edema induced by carrageenan, writhing test, formalin test, hot plate test and the toxicity of EEB were performed. Results: Phytochemical analysis has shown the presence of a and b-amyrins as major constituents of FHEX. Promising results of anti-inflammatory and antinociceptive activity were found for EEB, FHEX and FMEOH. Also were observed the EEB at 6000 mg/kg showed no toxicity. Conclusions: One might suggest that the activities of FHEX are due to the presence of a and b-amyrins and contributes to the biological activities of EEB.Item Bioprospecção das atividades antioxidante e antimicrobiana de espécies vegetais medicinais coletadas em Ouro Preto-MG.(2013) Souza, Juliana Neves de Paula; Candotti, Julia Gesualdi; Amparo, Tatiane Roquete; Coelho, Fabiana Fioravante; Rodrigues, Ivanildes Vasconcelos; Santos, Orlando David Henrique dos; Medeiros, Luiz Fernando Teixeira de; Furtado, Niege Araçari Jacometti Cardoso; Sousa, Hildeberto Caldas de; Souza, Gustavo Henrique Bianco deO presente estudo foi realizado com os extratos etanólicos brutos de seis espécies vegetais (Bathysaaustralis, Piper corcovadensis, Siparuna brasiliensis, Picramnia sp., Piper richardiifolium, Eugenia cf. cerasiflora) de uso medicinal, coletadas na região de Ouro Preto-MG. Os extratos etanólicos foram avaliados frente à atividade antioxidante (método do DPPH) e antimicrobiana (Concentração Inibitória Mínima, CIM), bem como submetidos à dosagem de compostos fenólicos (reagente Folin-Ciocalteau) e flavonóides totais (Cloreto de Alumínio). Os resultados evidenciaram que o extrato de Siparuma brasiliensis apresentou maior atividade antioxidante (CE50 17,712 μg/mL) e o de Piper richardiifolium a melhor atividade antimicrobiana para Staphylococcus aureus (300 μg/mL) e Staphylococcus saprophyticus (200 μg/mL). Estes resultados sugerem que as atividades avaliadas estão diretamente relacionadas com a presença de compostos fenólicos, porém não necessariamente à presença de flavonoides.