Artigos Científicos - FAQUI/ICEN

URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/2437

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Acesso aberto (Open Access)
Antioxidant capacity and larvicidal activity of essential oil and extracts from Lippia grandis
(2011-02) DAMASCENO, Evelyn Ivana Trindade; SILVA, Joyce Kelly do Rosário da; ANDRADE, Eloisa Helena de Aguiar; SOUSA, Pergentino José da Cunha; MAIA, José Guilherme Soares
The leaves and thin branches of Lippia grandis Schauer, Verbenaceae, are used for flavoring of food in the Brazilian Amazon, as substitute for oregano. In this study the constituents of the essential oil were identified and the antioxidant capacity and larvicidal activity of the oil and methanol extract and its sub-fractions were evaluated. A sensory evaluation was determined in view of absence of toxicity. The oil showed a yield of 2.1% and its main constituents were thymol (45.8%), p-cymene (14.3%), γ-terpinene (10.5%), carvacrol (9.9%) and thymol methyl ether (4.8%), totalizing 85%. The DPPH radical scavenging activity showed values for the EC50 between 9.0 and 130.5 µg mL-1 and the TEAC/ABTS values varied from 131.1 to 336.0 mg TE/g, indicating significant antioxidant activity for the plant. The total phenolic content ranged from 223.0 to 761.4 mg GAE/g, contributing to the antioxidant activity observed. The crude extracts inhibited the bleaching of β-carotene and the oil showed the greatest inhibition (42.5%). The oil (LgO, 7.6±2.4 µg mL-1) showed strong larvicidal activity against the brine shrimp bioassay. The sensory evaluation was highly satisfactory in comparison to oregano. The results are very promising for the use of L. grandis in seasoning and antioxidant products.
Acesso aberto (Open Access)
Seasonal variation in the essential oil of Pilocarpus microphyllus Stapf.
(2003-03) TAVEIRA, Francisca Socorro Nascimento; ANDRADE, Eloisa Helena de Aguiar; LIMA, Waterloo Napoleão de; MAIA, José Guilherme Soares
The essential oils of the leaves and fine stems of Pilocarpus microphyllus, collected on iron mineralized soil of the Serra de Carajás, Southeast of Pará State, Brazil, during the rainy and dry seasons, were obtained by hydrodistillation and analyzed by GC-MS. The main identified compounds were 2-tridecanone, b-caryophyllene, 2-pentadecanone, caryophyllene oxide and germacrene D. Their percentage contents varied with the season, the greater values having been detected mainly in the rainy season. For 2-tridecanone and b-caryophyllene the higher values were observed in the fine stem oils for the former, and in the leaf oils for the latter. For 2-pentadecanone, caryophyllene oxide and germacrene D they were also in the leaf oils. In general, the leaf oils were very distinguishable from those of fine stem oils, even in the same specimen.

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Navegando Artigos Científicos - FAQUI/ICEN por Autor "ANDRADE, Eloisa Helena de Aguiar"