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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Mohebali, Ghasemali Kaytash, Ashk Etemadi, Narges |
| Description | Country affiliation: Iran Author Affiliation: Mohebali G ( Biotechnology Research Center, Research Institute of Petroleum Industry, Tehran, Iran. mohebaligh@ripi.ir) |
| Abstract | Water-oil emulsions occur throughout oil production, transportation, and processing. The breaking of the water/oil emulsion improves oil quality and as a consequence chemically synthesized de-emulsifiers are commonly used in the petroleum industries. Microbial de-emulsifiers represent potential alternatives to the chemicals and may become important products for petroleum industries. The main goal of this work was isolation, identification, and characterization of an efficient de-emulsifying bacterium. Following a multi-step enrichment programme a de-emulsifying bacterium, Ochrobactrum anthropi strain RIPI5-1was isolated from the oil-polluted sandy bank of Siri Island, Iran. The presence of an oil phase in growth medium was found to be unnecessary for production of the de-emulsifier. The de-emulsifying activity of both the whole culture and the cells of this strain was examined using a model multiple water-crude oil (w/o/w) emulsion. This w/o/w emulsion was used for the first time in microbial de-emulsification research. Whole cells of strain RIPI5-1 exhibited high de-emulsifying activity during the late-exponential growth and stationary phases; de-emulsifying activity of the whole culture was highest during the early-exponential growth phase. The time course of de-emulsification by whole culture and whole cells of strain RIPI5-1 was investigated; the initial rate (DeI(1)) of breaking of the multiple water-crude oil emulsion by whole culture and whole cells was calculated as 11% and 54%, respectively. However, overall de-emulsification (DeI(8.5)) for whole culture and whole cells was calculated as 63% and 72%, respectively. A clear correlation was observed between cell surface hydrophobicity and the de-emulsifying activity of whole cells. With the water/kerosene emulsion, emulsion half-life (t(1/2)) was found to be <0.5h. The potential activity of this strain was also explained using a complex oilfield emulsion. |
| File Format | HTM / HTML |
| ISSN | 09277765 |
| Journal | Colloids and Surfaces B: Biointerfaces |
| Volume Number | 98 |
| e-ISSN | 18734367 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2012-10-01 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Chemistry Emulsifying Agents Chemistry Metabolism Emulsions Ochrobactrum Anthropi Oils Water Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Colloid and Surface Chemistry Medicine Physical and Theoretical Chemistry Surfaces and Interfaces Biotechnology |
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