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| Ferreira,Tatiana Felix; Coelho,Maria Alice Zarur; Rocha-Leão,Maria Helena Miguez da. |
| Yarrowia lipolytica is unique strictly aerobic yeast with the ability to efficiently degrade hydrophobic substrates such as n-alkenes, fatty acids, glycerol and oils. In the present work, a 2(4) full factorial design was used to investigate the influence of the independent variables of temperature, agitation, initial cell concentration and initial petroleum concentration on crude oil biodegradation. The results showed that all variables studied had significant effects on the biodegradation process. Temperature, agitation speed and initial cell concentration had positive effects, and initial petroleum concentration had a negative effect. Among the crude oil removal conditions studied, the best temperature and agitation conditions were 28ºC and 250 rpm,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Yarrowia lipolytica; Crude oil; Biodegradation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000500019 |
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| Freitas,Suely Pereira; Freitas-Silva,Otniel; Miranda,Iara Conceição de; Coelho,Maria Alice Zarur. |
| O objetivo deste trabalho foi utilizar o etanol comercial para extração e fracionamento simultâneos das frações lipídicas presentes na castanha-do-Brasil (Bertholletia excelsea H.B.K.). O óleo foi obtido a partir da castanha desidratada e moída. O processo foi conduzido na proporção 4:1 solvente/substrato (v.p-1) em banho termostatizado a 65 °C, sob agitação de 30 rpm. A mistura foi filtrada, resfriada a 10 °C e, a seguir, centrifugada para separação das fases: uma fase com consistência de gel (micela rica), contendo 75% de óleo e 25% de etanol, e a outra líquida, contendo 2,4% de óleo e 97,6% de etanol (micela pobre). Pelas características apresentadas, a micela rica tem potencial para ser utilizada no preparo de cremes vegetais como substituto parcial de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gorduras vegetais; Ácidos graxos; Solubilidade; Etanol. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612007000500002 |
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| Ribeiro,Bernardo Dias; Nascimento,Rafaella Ferreira; Barreto,Daniel Weingart; Coelho,Maria Alice Zarur; Freitas,Suely Pereira. |
| Mauritia vinifera (buriti) is a palm tree that grows wild in different areas of Brazil, particularly in the Amazonian region. The buriti oil is rich in carotenoids, especially in β-carotene. The growing interest in other natural sources of β-carotene has stimulated the industrial use of buriti as a raw material for pulp oil extraction. Most processes are based on the conventional technologies, involving drying and pressing the pulp for oil recovery and further separation of carotenoids in a liquid phase using organics solvents. In the present work, the ethanol-based process was evaluated for simultaneous carotenoids recovering and fractionating from buriti pulp. The raw material and ethanol, 1:4 ratio, were placed in an erlenmeyer flask and maintained at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beta-carotene; Vegetable oil; Ethanol; Buriti. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452010000300003 |
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