Navegando por Assunto "Dilapiol"

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Acesso aberto (Open Access)
Ação antimicrobiana do óleo essencial de Piper Aduncum e dilapiol em infecções de pele
(Universidade Federal do Pará, 2015-06-25) FERREIRA, Roseane Guimarães; MAIA, José Guilherme Soares; http://lattes.cnpq.br/1034534634988402
Piper aduncum L. is a plant with several biological properties such as antimicrobial activity, which is mainly associated with the action of its essential oil rich in dilapiolle. In recent years, the occurrence of skin infections caused by bacteria and fungi increased considered shape. Thus, this study aimed to evaluate the antimicrobial activity of essential oil of P. aduncum (OEPA) and dilapiolle, its major constituent, against pathogenic skin micro-organisms and their attachments. The antimicrobial activity was performed using the microdilution method and Forming Units count Cologne (UFC) for determining the Minimum Inhibitory Concentration (MIC), the Bactericidal Concentration Minimum (CBM) and Minimum Fungicidal Concentration (CFM). These plant compounds were tested against the filamentous fungi dermatophytes (FFD) and not dermatophyte (FFND), gram-positive bacteria and yeast. The results showed Trichophyton mentagrophytes front (ATCC and clinical isolate), MIC values of 500μg.mL-1 for OEPA and dilapiolle and CFM 1500 and 1000 µg.mL-1 , respectively. For clinical isolates of Trichophyton rubrum and Epidermophyton floccosum the MIC values of 500μg.mL-1 and CFM 1500μg.mL-1 , were similar for the two compounds as well as Microsporum canis and Microsporum gypseum with MIC values of 250μg.mL-1 and CFM 500μg.mL-1 . The Aspergillus fumigatus ATCC FFND showed an MIC of 3.9μg.mL-1 and 7.8 μg.mL-1 and the clinical isolate strain MIC of 3.9μg.mL-1 and CFM 15.6 μg.mL-1 for both. However showed no activity against Candida albicans and the yeast bacteria Staphylococcus aureus in the concentrations used.
Acesso aberto (Open Access)
Atividade antimicrobiana do óleo essencial de Piper aduncum L. e seu componente, dilapiol, frente a Staphylococcus spp. multirresistentes
(Universidade Federal do Pará, 2012-08-31) BRAZÃO, Maria Angélica Bolini; MONTEIRO, Marta Chagas; http://lattes.cnpq.br/6710783324317390
The essential oil of Piper aduncum (EPO) and its main component, the dilapiol (76.5%), were evaluated for antibacterial activity against different strains of Staphylococcus spp. ATCC and multiresistant. For testing the antibacterial activity of EPO and dilapiol were determined Minimum Inhibitory Concentration (MIC) and minimum bactericidal concentration (MBC), the technique of microdilution and by counting Colony Forming Units (CFU) using concentrations of 250, 500 , 750 and 1000 μg/ml of EPO and concentrations of 100 and 1000 μg/ml dilapiol. The bacterial inoculum used was adjusted to 1x104 range from 0.5 Mc Farland. As a negative control inoculum was used along with Tween 20, solubilising the essential oil and dilapiol, and as positive control we used the chloramphenicol 0.05 mg/mL. These compounds were tested against strains of S. aureus ATCC 25923, S. epidermidis ATCC 12228, MRSA hospital, and S.epidermidis, S. lentus multiresistant nosocomial. The results showed that the EPO showed the MIC 90% of 500 μg/mL and MBC of 1000 μg/mL against S. aureus ATCC 25923, whose concentration of 500 μg/mL was able to inhibit 60% of bacterial growth. The strain MRSA, the EPO showed a small inhibition (10%) at a concentration of 750 μg/mL, being obtained in the MIC90% 1000 μg/mL. In S. epidermidis ATCC 12228, the OEPA showed antimicrobial activity with MIC90% at 500 μg/mL and MBC at 750 μg/mL. For the strain S. epidermidis multiresistant, the PEO was able to inhibit only 35% growth of this strain at a concentration of 750 μg/mL, but the value obtained in the MIC90% 1000 mg/mL. As for dilapiol, the compound showed antimicrobial activity against a strain of S. aureus ATCC 25923 at a concentration of 1000 μg/mL, 100% growth inhibiting (CBM). On the other hand, had no antimicrobial effect on MRSA strain nor S. lentus multiresistant. Furthermore, the dilapiol inhibited only 20% of the growth of S. epidermidis ATCC 12228 and S. epidermidis multiresistant concentration of 1000 μg/mL. Thus, the data show a moderate antibacterial activity of the essential oil, and the dilapiol showed weak in vitro antimicrobial activity.
Acesso aberto (Open Access)
Destilação fracionada do óleo essencial de P. aduncum L. rico em dilapiol
(Universidade Federal do Pará, 2011-09-30) MARTINS, Gisele Luciana Domont; FARIA, Lênio José Guerreiro de; http://lattes.cnpq.br/7428609361678173
The species Piper aduncum L. is a shrubby plant, popularly known in the Amazon as monkey-pepper (spiked pepper). An essential oil, rich in dillapiol, can be extracted from this plant, which is of great economic interest for its insecticidal and pesticide action in agriculture. This biopesticide is an alternative to replace synthetic insecticides as it is from natural origin and does not cause damage to the environment and human health. In this paper the physical properties of the essential oil of spiked pepper were analyzed. The oil was obtained by steam distillation which showed mean values of refractive index of 1.516 and specific mass 1.08 g/cm³. The fractional distillation of the essential oil was studied, in order to concentrate the compound of interest, thus, adding greater economic value and enabling its use in the production of new products. In this process a high purity compound is obtained. The assessment was performed using a mathematical model to evaluate the concentration of dillapiol at the bottom of the distillation flask by regression analysis as a function of operating time which set the experimental data very well. The analysis of the results suggests that the process of fractional distillation can be used to separate the useful constituents from the essential oils. This is only possible because the essential oils are constituted of several volatile organic compounds with different boiling points and steam pressures, making the separation viable. The highest content of dillapiol obtained experimentally by the method of fractional distillation was 95 %, operating under vacuum conditions (40 mmHg) and mean temperature of the column of 122 ºC, and the average yield obtained was 41 % (v/v).