Microbial biosurfactant - physiology, biochemistry, and applications
Journal Article
·
· Dev. Ind. Microbiol.; (United States)
OSTI ID:5854687
A bacterial soil isolate H-13A was isolated which produces a cellular and extra-cellular glycolipid surfactant. Glycolipid is synthesized only during growth on n-alkanes (C12 ..-->.. C20). The glycolipid contains disaccharide, glycerol, amino sugar, N-acylated, and O-acylated fatty acids. Cellular glycolipid is characterized by saturated fatty acids and unsaturated fatty acids; whereas extracellular glycolipid contains saturated fatty acids and 2-hydroxy fatty acids. The hexadecane-derived glycolipid exhibits an interfacial-tension value of 2.0 x 10/sup -2/ dynes/cm at an effective alkane carbon number equivalent to decane. Addition of pentanol as a cosurfactant reduces the interfacial tension to 6.0 x 10/sup -5/ dynes/cm with an effective alkane carbon number equivalent to undecane. The glycolipid is effective in the reduction of heavy crude-oil viscosity by formation of stable oil-in-water emulsions with improved rheological properties. Growth of H-13A on Monagas crude ion results in a 95% reduction in oil viscosity. This glycolipid biosurfactant exhibits applicability to the transport, pipelining, processing, and recovery of heavy crude oils. 18 references, 1 figure, 4 tables.
- Research Organization:
- Univ. of Georgia, Athens
- DOE Contract Number:
- AS19-81BC10507
- OSTI ID:
- 5854687
- Journal Information:
- Dev. Ind. Microbiol.; (United States), Journal Name: Dev. Ind. Microbiol.; (United States) Vol. 25:2; ISSN DIMCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020900* -- Petroleum-- Environmental Aspects
550200 -- Biochemistry
550500 -- Metabolism
59 BASIC BIOLOGICAL SCIENCES
ALKANES
BACTERIA
BIOCHEMISTRY
BIOSYNTHESIS
CARBOHYDRATES
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
CHEMISTRY
DATA
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
GLYCOLIPIDS
GROWTH
HYDROCARBONS
INFORMATION
LIPIDS
METABOLISM
MICROORGANISMS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PETROLEUM
PHYSIOLOGY
SACCHARIDES
SURFACTANTS
SYNTHESIS
USES
020900* -- Petroleum-- Environmental Aspects
550200 -- Biochemistry
550500 -- Metabolism
59 BASIC BIOLOGICAL SCIENCES
ALKANES
BACTERIA
BIOCHEMISTRY
BIOSYNTHESIS
CARBOHYDRATES
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
CHEMISTRY
DATA
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
GLYCOLIPIDS
GROWTH
HYDROCARBONS
INFORMATION
LIPIDS
METABOLISM
MICROORGANISMS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PETROLEUM
PHYSIOLOGY
SACCHARIDES
SURFACTANTS
SYNTHESIS
USES