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| Registros recuperados: 19 | |
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| Fernandes,Paulo André Vicente; Arruda,Isabel Renata de; Santos,Antônio Fernando Amatto Botelho dos; Araújo,Ana Albertina de; Maior,Ana Maria Souto; Ximenes,Eulália Azevedo. |
| Lipopeptides represent a class of microbial surfactants with increasing scientific, therapeutic and biotechnological interests. The genus Bacillus is a producer of these active compounds, and among them B. subtilis produces surfactin, the most potent biosurfactant known. These compounds can act as antibiotics, antivirals, antitumorals, immunomodulators and enzyme inhibitors. In this work, the antimicrobial activity of biosurfactants obtained by cultivation of B. subtilis R14 was investigated against multidrug-resistant bacteria. During cultivation in defined medium, the surface tension of the medium was reduced from 54 mN/m in the beginning of the microbial growth to 30 mN/m after 20 hours. A crude surfactant concentration of 2.0 g/L was obtained after 40... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosurfactant; Bacillus subtilis; Lipopeptides; Antimicrobial activity. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822007000400022 |
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| Kaskatepe,Banu; Yildiz,Sulhiye; Gumustas,Mehmet; Ozkan,Sibel A.. |
| The aim of this study was to increase rhamnolipid production by formulating media using kefir and fish meal for Pseudomonas aeruginosa strains isolated from different environmental resources. The strains, named as H1, SY1, and ST1, capable of rhamnolipid production were isolated from soil contaminated with wastes originating from olive and fish oil factories. Additionally, P. aeruginosa ATCC 9027 strain, which is known as rhamnolipid producer, was included in the study. Initially, rhamnolipid production by the strains was determined in Mineral Salt Medium (MSM) and then in media prepared by using kefir and fish meal. The obtained rhamnolipids were purified and quantified according to Dubois et al. (1956). The quantity of rhamnolipids of ATCC, H1 and SY1... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosurfactant; Pseudomonas aeruginosa; Rhamnolipid; Kefir; Fish meal. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000300855 |
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| Santos,A.P.P.; Silva,M.D.S.; Costa,E.V.L.; Rufino,R.D.; Santos,V.A.; Ramos,C.S.; Sarubbo,L.A.; Porto,A.L.F.. |
| Surfactants are amphipathic compounds containing both hydrophilic and hydrophobic groups, capable to lower the surface or interfacial tension. Considering the advantages of the use of biosurfactants produced by microorganisms, the aim of this paper was to develop and characterize a biosurfactant produced by Streptomyces sp. DPUA1559 isolated from lichens of the Amazon region. The microorganism was cultured in a mineral medium containing 1% residual frying soybean oil as the carbon source. The kinetics of biosurfactant production was accompanied by reducing the surface tension of the culture medium from 60 to values around 27.14 mN/m, and by the emulsification index, which showed the efficiency of the biosurfactant as an emulsifier of hydrophobic compounds.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosurfactant; Surface tension; Emulsification; Streptomyces; Soybean frying oil. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000200606 |
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| Bicca,Flávio Correa; Fleck,Leonardo Colombo; Ayub,Marco Antônio Záchia. |
| There is world wide concern about the liberation of hydrocarbons in the environment, both from industrial activities and from accidental spills of oil and oilrelated compounds. Biosurfactants, which are natural emulsifiers of hydrocarbons, are produced by some bacteria, fungi and yeast. They are polymers, totally or partially extracellular, with an amphipathyc structure, which allows them to form micelles that accumulate at the interface between liquids of different polarities such as water and oil. This process is based upon the ability of biosurfactants to reduce surface tension, blocking the formation of hydrogen bridges and certain hydrophilic and hydrophobic interactions. The ability of biosurfactant production by five strains of Rhodococcus isolated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosurfactant; Hydrocarbon degradation; Rhodococcus sp. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000300008 |
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| Registros recuperados: 19 | |
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