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Production of surfactin isoforms by Bacillus subtilis BS-37 and its applicability to enhanced oil recovery under laboratory conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
3054 149 2015 7 PDF Available
Title
Production of surfactin isoforms by Bacillus subtilis BS-37 and its applicability to enhanced oil recovery under laboratory conditions
Abstract

•The proportion of surfactin isoforms altered when cultured in different mediums.•Surfactin products with different proportion of C15-surfactin were tested for oil-washing and oil displacement.•Surfactin products have a very low CMC of 20 mg/l (20 μM).•Surfactin products containing more C15 component showed the better oil-washing efficiency and oil displacement efficiency.•The produced surfactins have a huge potential in microbial enhanced oil recovery.

Natural surfactin is a mixture of cyclic lipopeptides built from variants of a heptapeptide and a β-hydroxy fatty acid with chain lengths of 13–15 carbon atoms. Bacillus subtilis BS-37 was a high-yield mutation strain; the titers of surfactin was 413 mg/l and 585 mg/l with 74.2% and 51.6% proportions of C15-surfactin when BS-37 was cultured in LB medium and glucose medium, respectively. The surfactin products had a low critical micelle concentration (CMC) of 20 mg/l (20 μM), and showed nice stability under strong alkali environment, high concentration of minerals and high temperature. The more C15-surfactin content in products, the better oil-washing efficiency and oil displacement efficiency was. At the concentration of 30 mg/l, surfactin products showed 88.5% of oil-washing efficiency and 13.48% of crude oil displacement efficiency, suggesting its promising application in enhancing oil recovery.

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Keywords
Biosurfactant; Microbial enhanced oil recovery; Amphiphilic materials; Polypeptides; Fermentation; Bioremediation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 93, 15 January 2015, Pages 31–37
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us