Navegando por Assunto "Hyptis crenata"

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Acesso aberto (Open Access)
Antioxidant capacity and biological activity of essential oil and methanol extract of Hyptis crenata Pohl ex Benth
(2009-03) REBELO, Monaliza Maia; SILVA, Joyce Kelly do Rosário da; ANDRADE, Eloisa Helena de Aguiar; MAIA, José Guilherme Soares
The essential oils of fresh and dried leaves and fine stems of Hyptis crenata furnished the following yields: 1.4% and 0.9%. The main volatile constituents were α-pinene (22.0%; 19.5%), 1,8-cineole (17.6%; 23.2%), β-pinene (17.0%; 13.8%), camphor (4.7%; 11.6%), limonene (5.4%; 4.4%) and γ-terpinene (3.5%; 2.4%), totalizing more than 70% in the oils. The DPPH radical scavenging activity (EC50, 16.7 + 0.4 µg/mL) of the methanol extract was comparable to BHT (19.8 ± 0.5 µg/mL) showing a significant antioxidant activity. The oils showed low activities. The amount of total phenolics (TP, 373.0 + 15.9 mg GAE/g) and trolox equivalent (TEAC, 226.8 + 0.5 mg TE/g) confirmed the antioxidant activity of the methanol extract that can be attributed to the presence of polar phenolic compounds. In the brine shrimp bioassay the lethal concentrations (LC50) for the oil and methanol extract were 6.7 + 0.2 µg/mL and 13.0 + 3.7 µg/mL, respectively, providing important evidence of their biological activities.
Acesso aberto (Open Access)
Avaliação da atividade antinociceptiva e antiinflamatória do óleo essencial de Hyptis crenata (Pohl) ex Benth
(Universidade Federal do Pará, 2008-11-07) BRAVIM, Luciana Silva; MAIA, José Guilherme Soares; http://lattes.cnpq.br/1034534634988402; SOUSA, Pergentino José da Cunha; http://lattes.cnpq.br/9909053957915090
Hyptis crenata (Pohl) ex Benth. is a herbaceous aromatic and medicinal plant, belongs to Lamiaceae, popularly known as salva-do-marajó, malva-do-marajó and hortelã-bravo. This plant is distributed since the mouth of Amazonas River, Marajó Island, Pantanal, and extending up to the states of Minas Gerais. Its essential oil is characterized by presence of monoterpenes and sesquiterpenes. The leaf tea is used as sudorific, tonic, stimulant, as well as to treat the eyes and throat inflammation, constipation and arthritis. Based in these information, we decided to evaluate the antinociceptive and anti-inflammatory activity of the oil (HcEO) of Hyptis crenata in mouse throught the following tests: abdominal constriction, hot plate, formalin, croton oil-induced ear edema, rat paw edema induced by dextran and carrageenan, carrageenan-induced peritonitis. The statistical method used in this study was ANOVA followed by multiple comparison (Student-Newman-Keuls test or Student t test). The essential oil was extracted by hydrodistillation, yield was 0,6% and their main components were monoterpenes (94,5%). The lethal dose (DL50) was 5000 mg/kg. In the abdominal constriction test, at doses of 250, 350 and 500 mg/kg, the HcEO inhibited the abdominal constrictions in 22,56%, 60,76% and 75,53%, respectively, in a dose-dependent manner when compared to the control group. The DE50 calculated was 364,22 mg/kg with a correlation coefficient of 0,9341. The oil not changed significantly the time of latency in the hot plate test. HcEO (364,22 mg/kg) caused an inhibition of the phase I in 26,42% and an inhibition of the phase II in 43,86% of the formalin test. Naloxone, an antagonist of opioid receptor, reverted the analgesic effect of EOHc. HcEO reduced croton oil-induced ear edema in 44,26%. In rat paw edema induced by dextran, HcEO produced inhibition at the dose of 364,22 mg/kg, but the rat paw edema induced by carrageenan this inhibition was not observed. In carrageenan-induced peritonitis, HcEo significantly decreased the leucocyte and neutrophil migration in 47,55% e 66,47%, respectively. Based on the results we are suggesting that the essential oil of H. crenata has an antinociceptive activity.It is probably as consequence of direct action on the nociceptive fiber, as well as the opioid system is involved in this effect. Further, our results suggest that anti-inflammatory activity of HcEO is probably of peripheral origin. It can be suggested, too, that the possible components responsible for these actions are the compounds monoterpenes presents in HcEO.