Solubilization of leonardite by white-rot fungi grown in stationary and shake flasks
Oxidized coals, including a naturally oxidized lignite identified as leonardite, are solubilized and sometimes degraded further by a variety of fungi and bacteria. Evidence for biosolubilization of coal was first presented by Fakoussa, and Cohen and Gabriele. Subsequent studies concentrated on screening organisms, characterization of the product, and determination of the biochemical mechanisms. Mechanisms of biosolubilization are poorly known and may vary with the species used and the media. There is evidence for both enzymatic degradation and alkaline solubilization. The objective of this study was to discover critical factors in solubilization and biosolubilization mechanisms by testing a variety of growth media, growth conditions, and fungi. Lignin-degrading species were emphasized because of similarities between the structures in lignin and in low-rank coals. The results indicate that during idiophase (secondary metabolism), the fungi produce alkaline materials that solubilize leonardite.
- Research Organization:
- Pittsburgh Energy Technology Center, PA (USA)
- DOE Contract Number:
- AC05-76OR00033
- OSTI ID:
- 5934457
- Report Number(s):
- CONF-8809269-
- Journal Information:
- Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States), Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Vol. 33:4; ISSN ACFPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
ALKALINE HYDROLYSIS
BIOCHEMICAL REACTION KINETICS
BIODEGRADATION
BROWN COAL
CANDIDA
CARBOHYDRATES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMPARATIVE EVALUATIONS
CULTURE MEDIA
DECOMPOSITION
DISSOLUTION
ENERGY SOURCES
EUMYCOTA
FOSSIL FUELS
FUELS
FUNGI
GROWTH
HYDROGEN COMPOUNDS
HYDROLYSIS
HYDROXIDES
KINETICS
LIGNIN
LIGNITE
LYSIS
MATERIALS
METABOLISM
MICROORGANISMS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PARTICLE SIZE
PERFORMANCE TESTING
PHANEROCHAETE
PLANTS
POLYSACCHARIDES
REACTION KINETICS
RHIZOPUS
SACCHARIDES
SIZE
SOLVOLYSIS
SYNTHESIS
TESTING
YEASTS