Use of different methods for detection of thermophilic biosurfactant-producing bacteria from hydrocarbon-contaminated bioremediated soils

GA Plaza, I Zjawiony, Ibrahim Banat

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110 Citations (Scopus)

Abstract

Sixteen bacterial strains were isolated from petroleum hydrocarbons contaminated soils and screened for biosurfactants/bioemulsifiers production in liquid culture containing crude oil under thermophilic conditions. The bacterial strains grew in wide range of temperature, from 37 degrees C to 100 degrees C. Six of them were Grain positive. Their biosurfactant-production was evaluated at 45 degrees C. Blood agar lysis, drop-collapse method, oil spreading and stalagmometric techniques and surface tension (ST) measurements were used to detect biosurfactant production. Emulsification activity for Culture broth was also tested using xylene, toluene, petroleum and diesel oils. All isolates reduced surface tension at varying degrees with strains: T/I resulting in the highest reduction (35 mN/m). The drop-collapse, oil spreading and stalagmometric and reduction techniques all seem to give clear indicative results for biosurfactant production while blood hemolytic activity did not. The use of both the drop-collapse and oil spreading techniques were easy and quick to screen for biosurfactant producers but were not always conclusive. Although surface tension reduction was a good measure of biosurfactant production, it did not correlate well with emulsion ability. Several of our isolates had good emulsifying abilities with all hydrocarbon tested. The simplicity of the above techniques allows effective screening of biosurfactant-producing microorganisms. Although hemolytic activity have been reported as an initial selection criterion for biosurfactant producers, other more conclusive tests such as surface tension measurements should be carried out for confirmation of the obtained results. (c) 2005 Elsevier B.V. All tights reserved.
LanguageEnglish
Pages71-77
JournalJournal of Petroleum Science and Engineering
Volume50
Issue number1
DOIs
Publication statusPublished - Jan 2006

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biosurfactants
polluted soils
hydrocarbons
surface tension
bacteria
oils
emulsifying
methodology
petroleum
xylene
diesel fuel
toluene
emulsifiers
blood
selection criteria
emulsions
agar
screening
microorganisms
liquids

Cite this

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title = "Use of different methods for detection of thermophilic biosurfactant-producing bacteria from hydrocarbon-contaminated bioremediated soils",
abstract = "Sixteen bacterial strains were isolated from petroleum hydrocarbons contaminated soils and screened for biosurfactants/bioemulsifiers production in liquid culture containing crude oil under thermophilic conditions. The bacterial strains grew in wide range of temperature, from 37 degrees C to 100 degrees C. Six of them were Grain positive. Their biosurfactant-production was evaluated at 45 degrees C. Blood agar lysis, drop-collapse method, oil spreading and stalagmometric techniques and surface tension (ST) measurements were used to detect biosurfactant production. Emulsification activity for Culture broth was also tested using xylene, toluene, petroleum and diesel oils. All isolates reduced surface tension at varying degrees with strains: T/I resulting in the highest reduction (35 mN/m). The drop-collapse, oil spreading and stalagmometric and reduction techniques all seem to give clear indicative results for biosurfactant production while blood hemolytic activity did not. The use of both the drop-collapse and oil spreading techniques were easy and quick to screen for biosurfactant producers but were not always conclusive. Although surface tension reduction was a good measure of biosurfactant production, it did not correlate well with emulsion ability. Several of our isolates had good emulsifying abilities with all hydrocarbon tested. The simplicity of the above techniques allows effective screening of biosurfactant-producing microorganisms. Although hemolytic activity have been reported as an initial selection criterion for biosurfactant producers, other more conclusive tests such as surface tension measurements should be carried out for confirmation of the obtained results. (c) 2005 Elsevier B.V. All tights reserved.",
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AB - Sixteen bacterial strains were isolated from petroleum hydrocarbons contaminated soils and screened for biosurfactants/bioemulsifiers production in liquid culture containing crude oil under thermophilic conditions. The bacterial strains grew in wide range of temperature, from 37 degrees C to 100 degrees C. Six of them were Grain positive. Their biosurfactant-production was evaluated at 45 degrees C. Blood agar lysis, drop-collapse method, oil spreading and stalagmometric techniques and surface tension (ST) measurements were used to detect biosurfactant production. Emulsification activity for Culture broth was also tested using xylene, toluene, petroleum and diesel oils. All isolates reduced surface tension at varying degrees with strains: T/I resulting in the highest reduction (35 mN/m). The drop-collapse, oil spreading and stalagmometric and reduction techniques all seem to give clear indicative results for biosurfactant production while blood hemolytic activity did not. The use of both the drop-collapse and oil spreading techniques were easy and quick to screen for biosurfactant producers but were not always conclusive. Although surface tension reduction was a good measure of biosurfactant production, it did not correlate well with emulsion ability. Several of our isolates had good emulsifying abilities with all hydrocarbon tested. The simplicity of the above techniques allows effective screening of biosurfactant-producing microorganisms. Although hemolytic activity have been reported as an initial selection criterion for biosurfactant producers, other more conclusive tests such as surface tension measurements should be carried out for confirmation of the obtained results. (c) 2005 Elsevier B.V. All tights reserved.

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