Biosurfactant production by two isolates ofPseudomonas aeruginosa |
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Authors: | C. Rocha F. San-Blas G. San-Blas L. Vierma |
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Affiliation: | (1) Instituto Venezolano de Investigaciones Cientificas (IVIC), Centro de Microbiologia y Biologia Celular, Apartado 21827, 1020A Caracas, Venezuela;(2) INTEVEP S.A., Apartado 76343, 1070A Caracas, Venezuela |
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Abstract: | Two strains of biosurfactant-producing bacteria, identified asPseudomonas aeruginosa, were isolated from injection water and crude oil-associated water in Venezuelan oil fields. Both biosurfactants resembled rhamnolipids and produced stable emulsions of heavy and extra-heavy crude oils, reducing the surface tension of water from 72 to 28 dynes/cm. Tenso-active properties of the biosurfactants were not affected by pH, temperature, salinity or Ca2+ or Mg2+ at concentrations in excess of those found in many oil reservoirs in Venezuela. |
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Keywords: | Biosurfactants microbially enhanced oil recovery Pseudomonas aeruginosa rhamnolipids |
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