Navegando por Assunto "Aromatic oil"

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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).
Acesso aberto (Open Access)
Otimização do processo de extração do óleo essencial de priprioca (Cyperus articulatus L.) por arraste com vapor
(Universidade Federal do Pará, 2009-05-29) CORUMBÁ, Lorena Gomes; FARIA, Lênio José Guerreiro de; http://lattes.cnpq.br/7428609361678173
It is analyzed the process of extraction of the essential oil of priprioca (Cyperus articulatus L.) rhizomes experimentally with water steam, in a prototype in bench scale. Through design of experiments and response surfaces methodology, they are considered the optimal conditions to maximize the response variables yield and mustakone concentration, majority component of the essential oil of priprioca, in function of operational entrance variables of the process. The independent variables and respective levels are: load or mass of priprioca rhizomes, in grams (64, 200, 400, 600, 736); granulometry of the rhizomes, in millimeters (0,61; 1,015; 1,6; 2,19; 2,58) and extraction time, in minutes (44, 60, 90, 120, 140). Using a central composite design, with aid of the application StatisticaR 7.0, mathematical models are proposed for the responses in function of the isolated independent variables and of their combinations. It is verified that the yield in essential oil and the mustakone tenors can be fitted appropriately for second order polynomials models. They are obtained larger yield simultaneously in oil and mustakone tenors, when the load of rhizomes varies from 105 to 400 grams for extraction times between 105 and 140 minutes.